10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 or 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2023

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 or 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from                 to

Commission File Number	Name of Registrant, Address of Principal Executive Offices and Telephone Number	State of Incorporation	I.R.S. Employer Identification Number
1-16681	Spire Inc. 700 Market Street St. Louis, MO 63101 314-342-0500	Missouri	74-2976504
1-1822	Spire Missouri Inc. 700 Market Street St. Louis, MO 63101 314-342-0500	Missouri	43-0368139
2-38960	Spire Alabama Inc. 605 Richard Arrington Blvd N Birmingham, AL 35203 205-326-8100	Alabama	63-0022000

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (only applicable to Spire Inc.):

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock $1.00 par value	SR	New York Stock Exchange LLC
Depositary Shares, each representing a 1/1,000th interest in a share of 5.90% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $25.00 per share	SR.PRA	New York Stock Exchange LLC

Securities registered pursuant to Section 12(g) of the Exchange Act: None

Indicate by check mark if each registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act of 1933, as amended.

Spire Inc. Yes ☒ No ☐ Spire Missouri Inc. Yes ☐ No ☒ Spire Alabama Inc. Yes ☐ No ☒

Indicate by check mark if each registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.

Spire Inc. Yes ☐ No ☒ Spire Missouri Inc. Yes ☐ No ☒ Spire Alabama Inc. Yes ☐ No ☒

Indicate by check mark whether each registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Spire Inc. Yes ☒ No ☐ Spire Missouri Inc. Yes ☒ No ☐ Spire Alabama Inc. Yes ☒ No ☐

Indicate by check mark whether each registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Spire Inc. Yes ☒ No ☐ Spire Missouri Inc. Yes ☒ No ☐ Spire Alabama Inc. Yes ☒ No ☐

Indicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

	Large accelerated filer	Accelerated filer	Non- accelerated filer	Smaller reporting company	Emerging growth company
Spire Inc.	☒	☐	☐	☐	☐
Spire Missouri Inc.	☐	☐	☒	☐	☐
Spire Alabama Inc.	☐	☐	☒	☐	☐

If an emerging growth company, indicate by check mark if each registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether each registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

Spire Inc. ☒ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

If securities are registered pursuant to Section 12(b) of the Exchange Act, indicate by check mark whether the financial statements of each registrant included in the filing reflect the correction of an error to previously issued financial statements.

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b).

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Spire Inc. Yes ☐ No ☒ Spire Missouri Inc. Yes ☐ No ☒ Spire Alabama Inc. Yes ☐ No ☒

The aggregate market value of the common equity held by non-affiliates of Spire Inc. amounted to $3,580,140,878 as of March 31, 2023. All of Spire Missouri Inc.’s and Spire Alabama Inc.’s equity securities are owned by Spire Inc., their parent company and a reporting company under the Exchange Act.

The number of shares outstanding of each registrant’s common stock, as of November 10, 2023, was as follows:

Spire Inc.	Common Stock, par value $1.00 per share	53,176,840
Spire Missouri Inc.	Common Stock, par value $1.00 per share (all owned by Spire Inc.)	25,855
Spire Alabama Inc.	Common Stock, par value $0.01 per share (all owned by Spire Inc.)	1,972,052

This combined Form 10-K represents separate filings by Spire Inc., Spire Missouri Inc., and Spire Alabama Inc. Information contained herein relating to an individual registrant is filed by that registrant on its own behalf. Each registrant makes no representation as to information relating to the other registrants, except that information relating to Spire Missouri Inc. and Spire Alabama Inc. is also attributed to Spire Inc.

Spire Missouri Inc. and Spire Alabama Inc. meet the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and are therefore filing this Form 10-K with the reduced disclosure format specified in General Instructions I(2) to Form 10-K.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of proxy statement for Spire Inc. to be filed on or about December 13, 2023 — Part III.

Certain exhibits as indicated in Part IV.

TABLE OF CONTENTS

		Page
GLOSSARY OF KEY TERMS AND ABBREVIATIONS		2
PART I		3
FORWARD-LOOKING STATEMENTS		3
Item 1	Business	4
Item 1A	Risk Factors	11
Item 1B	Unresolved Staff Comments	21
Item 2	Properties	21
Item 3	Legal Proceedings	21
Item 4	Mine Safety Disclosures	21
Information about our Executive Officers (Item 401(b) of Regulation S-K)		22
PART II		23
Item 5	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	23
Item 6	(Reserved)	24
Item 7	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 7A	Quantitative and Qualitative Disclosures About Market Risk	43
Item 8	Financial Statements and Supplementary Data	44
Item 9	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	122
Item 9A	Controls and Procedures	122
Item 9B	Other Information	124
Item 9C	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	124
PART III		124
Item 10	Directors, Executive Officers and Corporate Governance	124
Item 11	Executive Compensation	124
Item 12	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	124
Item 13	Certain Relationships and Related Transactions, and Director Independence	124
Item 14	Principal Accounting Fees and Services	124
PART IV		125
Item 15	Exhibits, Financial Statement Schedules	125
Item 16	Form 10-K Summary	130
SIGNATURES		131

1

GLOSSARY OF KEY TERMS AND ABBREVIATIONS

AOCI	Accumulated other comprehensive income or loss	NYMEX	New York Mercantile Exchange, Inc.
APSC	Alabama Public Service Commission	NYSE	New York Stock Exchange
ASC	Accounting Standards Codification	O&M	Operation and maintenance expense
ASU	Accounting Standards Update	OCI	Other comprehensive income or loss
CCF	A gas measurement which represents a unit of volume equal to one hundred cubic feet	OFO	Operational Flow Order
CCM	Cost Control Measure	PGA	Purchased Gas Adjustment
Company	Spire and its subsidiaries unless the context suggests otherwise	RSE	Rate Stabilization and Equalization
EPS	Earnings per share	SEC	U.S. Securities and Exchange Commission
ESR	Enhanced Stability Reserve	Spire	Spire Inc.
FASB	Financial Accounting Standards Board	Spire Alabama	Spire Alabama Inc.
FERC	Federal Energy Regulatory Commission	Spire EnergySouth	Spire EnergySouth Inc., parent of Spire Gulf and Spire Mississippi
GAAP	Accounting principles generally accepted in the United States of America	Spire Gulf	Spire Gulf Inc.
Gas Marketing	Segment including Spire Marketing, which provides natural gas marketing services	Spire Marketing	Spire Marketing Inc.
Gas Utility	Segment including the operations of the Utilities	Spire Mississippi	Spire Mississippi Inc.
GSA	Gas Supply Adjustment	Spire Missouri	Spire Missouri Inc.
ICE	Intercontinental Exchange	Spire STL Pipeline	Spire STL Pipeline LLC, or the 65-mile FERC-regulated pipeline it owns and operates to deliver natural gas into eastern Missouri
ISRS	Infrastructure System Replacement Surcharge	Spire Storage	The physical natural gas storage operations of Spire Storage West LLC and Spire Storage Salt Plains LLC
Midstream	Segment including Spire STL Pipeline and Spire Storage	U.S.	United States
MMBtu	Million British thermal units	Utilities	Spire Missouri, Spire Alabama and the subsidiaries of Spire EnergySouth
MoPSC	Missouri Public Service Commission
MSPSC	Mississippi Public Service Commission

2

PART I

FORWARD-LOOKING STATEMENTS

Certain matters discussed in this report, excluding historical information, include forward-looking statements. Certain words, such as “may,” “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan,” “seek,” “target,” and similar words and expressions identify forward-looking statements that involve uncertainties and risks. Future developments may not be in accordance with our current expectations or beliefs and the effect of future developments may not be those anticipated. Among the factors that may cause results or outcomes to differ materially from those contemplated in any forward-looking statement are:

•  Weather conditions and catastrophic events, particularly severe weather in U.S. natural gas producing areas;

•  Volatility in gas prices, particularly sudden and sustained changes in natural gas prices, including the related impact on margin deposits associated with the use of natural gas derivative instruments, and the impact on our competitive position in relation to suppliers of alternative heating sources, such as electricity;

•  Changes in gas supply and pipeline availability, including as a result of decisions by natural gas producers to reduce production or shut in producing natural gas wells and expiration or termination of existing supply and transportation arrangements that are not replaced with contracts with similar terms and pricing, as well as other changes that impact supply for and access to the markets in which our subsidiaries transact business;

•  Acquisitions may not achieve their intended results;

•  Legislative, regulatory and judicial mandates and decisions, some of which may be retroactive, including those affecting:

•  allowed rates of return and recovery of prudent costs,

•  incentive regulation,

•  industry structure,

•  purchased gas adjustment provisions,

•  rate design structure and implementation,

•  capital structures established for rate-setting purposes,

•  regulatory assets,

•  non-regulated and affiliate transactions,

•  franchise renewals,

•  authorization to operate facilities,

•  environmental or safety matters, including the potential impact of legislative and regulatory actions related to climate change and pipeline safety and security,

•  taxes,

•  pension and other postretirement benefit liabilities and funding obligations, or

•  accounting standards;

•  The results of litigation;

•  The availability of and access to, in general, funds to meet our debt obligations prior to or when they become due and to fund our operations and necessary capital expenditures, either through (i) cash on hand, (ii) operating cash flow, or (iii) access to the capital markets;

•  Retention of, ability to attract, ability to collect from, and conservation efforts of, customers;

•  Our ability to comply with all covenants in our indentures and credit facilities any violations of which, if not cured in a timely manner, could trigger a default of our obligations;

•  Energy commodity market conditions;

•  Discovery of material weakness in internal controls;

•  The disruption, failure or malfunction of our operational and information technology systems, including due to cyberattacks; and

•  Employee workforce issues, including but not limited to labor disputes, the inability to attract and retain key talent, and future wage and employee benefit costs, including costs resulting from changes in discount rates and returns on benefit plan assets.

Readers are urged to consider the risks, uncertainties, and other factors that could affect our business as described in this report. All forward-looking statements made in this report rely upon the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. We do not, by including this statement, assume any obligation to review or revise any particular forward-looking statement in light of future events.

3

Item 1. Business

OVERVIEW

Spire Inc. (“Spire”) was formed in 2000 and is the holding company for Spire Missouri Inc. (“Spire Missouri”), Spire Alabama Inc. (“Spire Alabama”), other gas utilities, and gas-related businesses. Spire Missouri was formed in 1857 and Spire Alabama was formed in 1948 by the merger of two gas companies. Spire is committed to transforming its business and pursuing growth through growing organically, investing in infrastructure, and advancing through innovation. The Company has three reportable business segments: Gas Utility, Gas Marketing and Midstream.

The Gas Utility segment includes the regulated operations of Spire Missouri, Spire Alabama, Spire Gulf Inc. (“Spire Gulf”) and Spire Mississippi Inc. (“Spire Mississippi”) (collectively, the “Utilities”). The business of the Utilities is subject to seasonal fluctuations with the peak period occurring in the winter heating season, typically November through April of each fiscal year. Spire Missouri is a public utility engaged in the purchase, retail distribution and sale of natural gas, with primary offices located in St. Louis, Missouri. Spire Missouri is the largest natural gas distribution utility system in Missouri, serving approximately 1.2 million residential, commercial and industrial customers in St. Louis, Kansas City, and other areas in Missouri. Spire Alabama is a public utility engaged in the purchase, retail distribution and sale of natural gas principally in central and northern Alabama, serving more than 0.4 million residential, commercial and industrial customers with primary offices located in Birmingham, Alabama. Spire Gulf and Spire Mississippi are utilities engaged in the purchase, retail distribution and sale of natural gas to 0.1 million customers in the Mobile, Alabama area and south-central Mississippi.

The Gas Marketing segment includes Spire Marketing Inc. (“Spire Marketing”), a wholly owned subsidiary providing natural gas marketing services.

The Midstream segment includes Spire STL Pipeline LLC (“Spire STL Pipeline”) and Spire Storage (consisting of the operations of Spire Storage West LLC and Spire Storage Salt Plains LLC), which are subsidiaries engaged in the transportation and storage of natural gas.

As of September 30, 2023, Spire had 3,589 employees, including 1,967 for Spire Missouri and 802 for Spire Alabama. We believe that:

1. the safety and well-being of our employees is one of our most important responsibilities,

2. the development, education and advancement of employees is key to our sustainability, and

3. embracing an inclusive workforce full of diverse backgrounds and perspectives drives innovation.

We continue to implement processes, procedures and programs that reflect our focus on consistently reducing our employee injury and motor vehicle accident rates. In 2023, we held our 10^th annual safety summit, and we encourage employees to identify potential safety improvements in the workplace, which is one of the driving forces behind reducing motor vehicle incidents and work-related injuries. We have also installed safety cameras in all Company vehicles, which are accompanied by driver coaching initiatives, to promote safe driving habits. To support employee wellness, we offer incentives for weight management and gym membership, as well as employee assistance programs to provide counseling services and emotional support, and we have a formalized comprehensive well-being program that focuses on the physical, emotional, social and financial health of every employee.

All employees have access to developmental assessments, customized training, specialized degree programs, and partnerships with best-in-class organizations related to industry courses, leadership and management workshops and computer application development seminars. In addition, all employees are eligible for up to $6,000 per year in tuition assistance and have access to the Spire Learning Center, our robust internal learning management system. In their first year, each construction and maintenance employee receives 80 hours of safety training, while each service and installation employee receives 200 hours of training. Field operations employees average 24 hours of technical and procedural training annually.

We regularly review and adjust our affirmative action plans based on placement and utilization rates, and we strive to create an even more diverse and inclusive work environment. Our Human Rights Policy demonstrates that Spire understands its universal responsibility to respect human rights and provides the basis for publicly affirming our values and embedding the responsibility into Spire’s operations and the way we do business.

4

Spire uses its website, SpireEnergy.com, as its primary channel for distribution of important information including news releases, analyst presentations and financial information. The information Spire, Spire Missouri and Spire Alabama file or furnish to the United States (U.S.) Securities and Exchange Commission (SEC), including annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and their amendments, and proxy statements are available free of charge under “Filings & reports” in the Investors section of Spire’s website, SpireEnergy.com, as soon as reasonably practical after the information is filed with or furnished to the SEC. Information contained on Spire’s website is not incorporated by reference in this report. The SEC also maintains a website that contains Spire’s SEC filings (sec.gov).

GAS UTILITY

Natural Gas Supply

The Utilities’ fundamental gas supply strategy is to meet the two-fold objective of 1) ensuring a dependable gas supply is available for delivery when needed and 2) insofar as is compatible with that dependability, purchasing gas that is economically priced. In structuring their natural gas supply portfolio, the Utilities focus on natural gas assets that are strategically positioned to meet the Utilities’ primary objectives.

Spire Missouri focuses its gas supply portfolio around a number of large natural gas suppliers with equity ownership or control of assets strategically situated to complement its regionally diverse firm transportation arrangements. Spire Missouri utilizes Midcontinent, Gulf Coast, Northeast, and Rocky Mountain gas sources to provide a level of supply diversity that facilitates the optimization of pricing differentials as well as protecting against the potential of regional supply disruptions. Further, Spire STL Pipeline may deliver up to 400,000 million British thermal units (MMBtu) per day of natural gas into eastern Missouri, of which Spire Missouri is the foundation shipper with a contractual commitment of 350,000 MMBtu per day.

In fiscal 2023, Spire Missouri purchased natural gas from 24 different suppliers to meet its total service area current gas sales and storage injection requirements. Spire Missouri entered into firm agreements with suppliers including major producers and marketers providing flexibility to meet the temperature-sensitive needs of its customers. Natural gas purchased by Spire Missouri for delivery to its service areas included 50.3 billion cubic feet (Bcf) through the Southern Star Central Gas Pipeline, Inc. (Southern Star) system, 35.8 Bcf through the Enable Mississippi River Transmission LLC (MRT) system, 22.9 Bcf through the Spire STL Pipeline, 6.0 Bcf through the Tallgrass Interstate Gas Transmission, LLC (TIGT) system, 4.3 Bcf through the Panhandle Eastern Pipe Line Company, LP (PEPL) system, and 2.8 Bcf through the Rockies Express Pipeline, LLC (REX) system. Spire Missouri also holds firm transportation arrangements on several other interstate pipeline systems that provide access to gas supplies upstream. Some of Spire Missouri’s commercial and industrial customers purchased their own gas with Spire Missouri transporting 51.2 Bcf to them through its distribution system.

The fiscal 2023 peak day send out of natural gas to Spire Missouri East customers, including transportation customers, occurred on December 23, 2022. The average temperature was 6 degrees Fahrenheit in St. Louis, and on that day Spire Missouri East customers consumed 1.04 Bcf of natural gas. This peak day demand was met with natural gas transported to St. Louis through the MRT, Missouri Gas Pipeline LLC, Spire STL Pipeline, and Southern Star transportation systems, and from Spire Missouri’s on-system storage.

The fiscal 2023 peak day send out of natural gas to Spire Missouri West customers, including transportation customers, occurred on December 22, 2022. The average temperature was -3 degrees Fahrenheit in Kansas City, and on that day Spire Missouri West customers consumed 0.91 Bcf of natural gas. This peak day demand was met with natural gas transported to Kansas City through the Southern Star, PEPL, TIGT, and REX transportation systems.

Spire Alabama’s distribution system is connected to two major interstate natural gas pipeline systems, Southern Natural Gas Company, L.L.C. (Southern Natural Gas) and Transcontinental Gas Pipe Line Company, LLC (Transco). It is also connected to two intrastate natural gas pipeline systems.

5

Spire Alabama purchases natural gas from various natural gas producers and marketers. Certain volumes are purchased under firm contractual commitments with other volumes purchased on a spot market basis. The purchased volumes are delivered to Spire Alabama’s system using a variety of firm transportation, interruptible transportation and storage capacity arrangements designed to meet the system’s varying levels of demand.

In fiscal 2023, Spire Alabama purchased natural gas from 24 different suppliers to meet current gas sales, storage injection, and liquefied natural gas (LNG) liquefaction requirements, of which one supplier is under a long-term supply agreement. Approximately 47.8 Bcf was purchased for delivery by Southern Natural Gas, 5.6 Bcf by BBT-AlaTenn, 3.8 Bcf by Transco, and 18.2 Bcf through intrastate pipelines to the Spire Alabama delivery points for its residential, commercial, and industrial customers.

The fiscal 2023 peak day send out for Spire Alabama was 0.6 Bcf of natural gas on December 23, 2022, when the average temperature was 13 degrees Fahrenheit in Birmingham, of which 80% was met with supplies transported through Southern Natural Gas, Transco, and intrastate facilities. The remaining 20% was fulfilled with LNG. 

Spire Gulf’s distribution system is directly connected to interstate pipelines, natural gas processing plants and gas storage facilities. Spire Gulf buys from a variety of producers and marketers, with BP Energy Company being the primary supplier.

Natural Gas Storage

Spire Missouri believes it currently has ample storage capacity to meet the demands of its distribution system, particularly to augment its supply during peak demand periods. Spire Missouri has a contractual right to store 21.6 Bcf of gas in MRT’s storage facility located in Unionville, Louisiana, 16.0 Bcf of gas storage in Southern Star’s system storage facilities located in Kansas and Oklahoma, 1.4 Bcf of firm storage on PEPL’s system storage, and 1.0 Bcf of firm storage with Spire Storage Salt Plains. MRT’s tariffs allow injections into storage from May 1 through November 1 and require the withdrawal from storage of all but 4.3 Bcf from November 1 through May 1. Southern Star tariffs allow both injections and withdrawals into storage year-round with ratchets that restrict the associated flows dependent upon the underlying inventory level per the contracts.

In addition, Spire Missouri supplements pipeline gas with natural gas withdrawn from its own underground storage field located in St. Louis and St. Charles Counties in Missouri. The field is designed to provide approximately 0.35 Bcf of natural gas withdrawals on a peak day and provides the ability to reinject natural gas during the heating season to replenish or increase deliverability, subject to maximum annual net withdrawals of approximately 4.0 Bcf of natural gas based on the inventory level that Spire Missouri plans to maintain.

Spire Alabama has a contractual right to store 12.7 Bcf of gas with Southern Natural Gas, 0.5 Bcf of gas with Gulf South Pipeline, 0.2 Bcf of gas with Transco and 0.2 Bcf of gas with Tennessee Gas Pipeline. In addition, Spire Alabama has 2.0 Bcf of on-system LNG storage that can provide the system with up to an additional 0.2 Bcf of natural gas daily to meet peak day demand.

Spire Gulf obtains adequate storage capacity through Gulf South Pipeline Company, LP, and Enstor Gas, LLC’s Bay Gas Storage.

Union Agreements

The Company believes labor relations with its employees are good. Should that condition change, the Company could experience labor disputes, work stoppages or other disruptions that could negatively impact the Company’s system operations, customer service, results of operations and cash flows.

6

The following table presents the Company’s various labor agreements as of September 30, 2023:

		Employees		Contract Start	Contract End
Union	Local	Covered		Date	Date
Spire Missouri
United Steel, Paper and Forestry, Rubber Manufacturing, Allied-Industrial and Service Workers International Union (USW)	884		67	August 10, 2021	July 31, 2024
USW	11-6		873	August 1, 2021	July 31, 2024
USW	11-6-03		98	August 1, 2021	July 31, 2024
USW	12561		132	August 1, 2022	July 31, 2025
USW	14228		40	August 1, 2022	July 31, 2025
USW	11-267		28	August 1, 2022	July 31, 2025
International Brotherhood of Electrical Workers	53		1	October 1, 2022	September 30, 2025
Gas Workers Metal Trades locals of the United Association of Journeyman and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada	781-Kansas City		215	August 1, 2022	July 31, 2025
Gas Workers Metal Trades locals of the United Association of Journeyman and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada	781-Monett		49	August 1, 2022	July 31, 2025
Total Spire Missouri			1,503
Spire Alabama
USW	12030		210	May 1, 2023	April 30, 2026
United Association of Gas Fitters	548		207	May 1, 2022	April 30, 2025
Total Spire Alabama			417
Spire Gulf
USW	541		61	August 1, 2023	July 31, 2026
Total Spire			1,981

7

Operating Revenues and Customer Information

The following tables present information on Spire’s revenues and volume sold and transported (before intersegment eliminations), and annual average numbers of customers for the three years ended September 30, 2023, 2022 and 2021.

Gas Utility Operating Revenues
(% of Total)	2023			2022			2021
Residential		67	%		73	%		58	%
Commercial & Industrial		25	%		17	%		28	%
Transportation		5	%		6	%		6	%
Other		3	%		4	%		8	%
Total		100	%		100	%		100	%

Gas Utility Volume Sold and Transported
(In millions of CCF)	2023		2022		2021
Residential		965.3		994.7		1,069.6
Commercial & Industrial		468.7		468.9		479.0
Transportation		1,662.9		1,617.6		1,614.7
Interruptible		10.9		11.8		15.0
Total System		3,107.8		3,093.0		3,178.3
Off-System		112.9		82.0		69.4
Total		3,220.7		3,175.0		3,247.7

Gas Utility Customers	2023		2022		2021
Residential		1,621,822		1,618,515		1,612,385
Commercial & Industrial		112,753		113,077		112,635
Transportation		1,013		1,023		846
Interruptible		45		50		63
Total		1,735,633		1,732,665		1,725,929

Total annual average number of customers for Spire Missouri and Spire Alabama for fiscal 2023 was 1,203,003 and 430,290, respectively.

Regulatory Matters

For details on regulatory matters, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

Other Pertinent Matters

Spire Missouri is the only distributor of natural gas within its franchised service areas, while Spire Alabama is the main distributor of natural gas in its service areas. Spire Missouri and Spire Alabama have franchises in nearly all the communities where they provide service with terms varying from five years to an indefinite duration. A franchise is essentially a municipal permit to install and maintain pipes and construct other facilities in the community. All of the franchises are free from unduly burdensome restrictions and are adequate for the conduct of Spire Missouri’s and Spire Alabama’s current public utility businesses in their respective states. In recent years, although certain franchise agreements have expired, the Utilities have continued to provide service in those communities without formal franchises.

The principal competition for the Utilities comes from the local electric companies. Other competitors in the service areas include suppliers of fuel oil, coal, and propane, as well as natural gas pipelines that can directly connect to large volume customers. Coal has been price competitive as a fuel source for very large boiler plant loads, but environmental requirements have shifted the economic advantage to natural gas. Oil and propane can be used to fuel boiler loads and certain direct-fired process applications, but these fuels require on-site storage, thus limiting their competitiveness. Competition also comes from district steam systems in the downtown areas of both St. Louis and Kansas City and from municipally or publicly owned natural gas distributors located adjacent to the Alabama service territories. Direct use of renewables will continue to grow in the future and compete against distributed generation using natural gas.

8

Residential, commercial, and industrial customers represent approximately 95% and 83% of fiscal 2023 operating revenues for Spire Missouri and Spire Alabama, respectively. Given the current level of natural gas supply and market conditions, the Utilities believe that the relative comparison of natural gas equipment and operating costs with those of competitive fuels will not change significantly in the foreseeable future, and that these markets will continue to be supplied by natural gas. In new multi-family and commercial rental markets, the Utilities’ competitive exposures are presently limited to space and water heating applications.

Spire Missouri and Spire Alabama offer gas transportation service to its large commercial and industrial customers. Transportation customers represent approximately 2% and 14% of fiscal 2023 operating revenues for Spire Missouri and Spire Alabama, respectively. The Spire Missouri tariff approved for that type of service produces a margin similar to that which Spire Missouri would have received under their regular sales rates. Similarly, Spire Alabama’s tariff is based on Spire Alabama’s sales profit margin so that operating margins are unaffected.

The Utilities are subject to various environmental laws and regulations that, to date, have not materially affected the Utilities’ or the Company’s financial position and results of operations. For a detailed discussion of environmental matters, see Note 16, Commitment and Contingencies, of the Notes to Financial Statements in Item 8.

GAS MARKETING

Spire Marketing is engaged in the marketing of natural gas and related services throughout the U.S., which includes customers within and outside of the Utilities’ service areas. For fiscal 2023 and 2022, Spire Marketing volumes averaged 1.40 Bcf/day and 1.73 Bcf/day, respectively. The majority of Spire Marketing’s business is derived from the procurement and physical delivery of natural gas to a diverse customer base, primarily in the central and southern U.S. Through its retail operations, Spire Marketing offers natural gas marketing services to large commercial and industrial customers, while its wholesale business consists of producers, pipelines, power generators, municipalities, storage operators, and utility companies. Wholesale activities currently represent a majority of the total Gas Marketing business. The Gas Marketing strategy is to leverage its market expertise and risk management skills to manage and optimize the value of its portfolio of commodity, transportation, park and loan, and storage contracts while controlling costs and acting on new marketplace opportunities.

In the course of its business, Spire Marketing enters into agreements to purchase natural gas at a future date in order to lock up supply to cover future sales commitments to its customers. To secure access to the markets it serves, Spire Marketing contracts for transportation capacity on various pipelines from pipeline companies directly and from other parties through the secondary capacity market. Throughout fiscal 2023, Spire Marketing held approximately 1 Bcf per day of firm transportation capacity. In addition, to ensure reliability of service and to provide operational flexibility, Spire Marketing enters into firm storage contracts and interruptible park and loan transactions with various companies, where it is able to buy and retain gas to be delivered at a future date, at which time it sells the natural gas to third parties. As of September 30, 2023, Spire Marketing has contracted for approximately 18 Bcf of such storage and park and loan capacity for the 2023-2024 winter season.

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MIDSTREAM

Spire Midstream consists of three facilities located in the U.S.: Spire STL Pipeline, Spire Storage West, and Spire Storage Salt Plains.

Spire STL Pipeline owns and operates a 65-mile pipeline connecting the Rockies Express Pipeline in Scott County, Illinois, to multiple delivery points in St. Louis County, Missouri, including Spire Missouri. Spire STL Pipeline’s operating revenue is derived primarily from Spire Missouri as its foundation shipper. The pipeline is under the jurisdiction of the Federal Energy Regulatory Commission (FERC).

Spire Storage West is engaged in the storage of natural gas serving markets primarily in the western region of the U.S. The facility is located in southwestern Wyoming and consists of two storage fields operating under one FERC market-based rate tariff currently authorized to provide up to 55 Bcf of storage capacity to customers. The actual storage capacity was 23 Bcf as of September 30, 2023, and management is in the process of expanding it to 39 Bcf by 2025.

Spire Storage Salt Plains is located in north central Oklahoma and serves markets in the midcontinent and midwestern U.S. The facility operates under intrastate regulation and has a certificated capacity of 13 Bcf and working capacity of 10 Bcf.

OTHER

Other components of the Company’s consolidated information include Spire's subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.

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Item 1A. Risk Factors

Spire’s, Spire Missouri’s and Spire Alabama’s businesses and financial results are subject to a number of risks and uncertainties, including those set forth below. The risks described below are those management considers to be material. When considering any investment in these companies’ securities, investors should carefully consider the following information, as well as information contained in the caption “Forward-Looking Statements,” Item 7A, and other documents Spire, Spire Missouri, and Spire Alabama file with the SEC. This list is not exhaustive, and management places no priority or likelihood based on the risk descriptions, order of presentation or grouping.

RISKS AND UNCERTAINTIES THAT RELATE TO REGULATORY, LEGISLATIVE AND LITIGATION FACTORS

Regulatory and legislative developments in the energy industry related to climate change or in support of increased energy efficiency may adversely affect operations and financial results.

There have been a number of federal, state and local legislative and regulatory initiatives proposed in recent years in an attempt to control or limit the effects of global warming and overall climate change, including greenhouse gas emissions, such as methane and carbon dioxide. Adoption of this type of legislation by Congress or similar legislation by states or localities, or the adoption of related regulations by federal, state or local governments mandating a substantial reduction in greenhouse gas emissions, restricting the use of fossil fuels, such as natural gas, or restricting the construction of infrastructure could have far-reaching and significant impacts on the energy industry. Such new legislation or regulations could result in increased compliance costs or additional operating restrictions, adversely affect the demand for natural gas and/or midstream services, or impact the prices charged to customers, potentially reducing customer growth opportunities and/or increasing the cost of doing business.

In addition, legislative and regulatory initiatives by the federal, state and local governments addressing greenhouse gas emissions or restricting the use of natural gas could adversely affect customer demand. The promulgation of regulations of the emissions of greenhouse gases and efficiency for residential gas furnaces and other gas appliances or the potential enactment of congressional legislation addressing global warming and climate change may decrease customer usage, encourage fuel switching from gas to other energy forms, and may result in future additional compliance costs that could impact the Utilities’ financial conditions and results of operations. At this time, we cannot predict the potential impact of such laws or regulations that may be adopted on the Company’s and the Utilities’ future business, financial condition or financial results.

Regulation of the Utilities’ businesses may impact rates they are able to charge, costs, and profitability.

The Utilities are subject to regulation by federal, state and local authorities. At the state level, the Utilities are regulated in Missouri by the Missouri Public Service Commission (MoPSC), in Alabama by the Alabama Public Service Commission (APSC), and in Mississippi by the Mississippi Public Service Commission (MSPSC). These state public service commissions regulate many aspects of the Utilities’ distribution operations, including construction and maintenance of facilities, operations, safety, the rates the Utilities may charge customers, the terms of service to their customers, transactions with their affiliates, the rate of return they are allowed to realize, and the accounting treatment for certain aspects of their operations. For further discussion of these accounting matters, see Regulatory Accounting under Critical Accounting Estimates in Item 7.

Accounting for the economics of rate regulation affects multiple financial statement line items (such as property, plant, and equipment; regulatory assets and liabilities; operating revenues; and operating expenses) and affects multiple disclosures in the Company’s financial statements. There is a risk that the state public service commissions will not approve full recovery of the costs of providing utility service or recovery of all amounts invested in the utility business and a reasonable return on that investment. A material disallowance of deferred costs could adversely affect the Utilities’ results of operations.

The MoPSC also approves Spire Missouri’s Infrastructure System Replacement Surcharge (ISRS). The ISRS allows Spire Missouri expedited recovery for its investment to upgrade its infrastructure and enhance its safety and reliability without the necessity of a formal rate case. Such investments are subject to review, and there is risk that any material disallowance of costs under ISRS could adversely affect the timing of revenues and cash flows.

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The Utilities’ ability to obtain and timely implement rate increases and rate supplements to maintain the current rate of return is subject to regulatory review and approval. There can be no assurance that they will be able to obtain rate increases or rate supplements or continue earning the current authorized rates of return. Spire Alabama’s and Spire Gulf’s rate setting process, Rate Stabilization and Equalization (RSE), is subject to regulation by the APSC and is implemented pursuant to APSC orders expiring September 30, 2025. RSE adjustments would continue after that date unless the APSC enters an order to the contrary in a manner consistent with the law. Spire Mississippi is subject to regulation by the MSPSC and utilizes the Rate Stabilization Adjustment (RSA) Rider. For further details, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

The Utilities could incur additional costs if required to adjust to new laws or regulations, revisions to existing laws or regulations or changes in interpretations of existing laws or regulations. In addition, as the regulatory environment for the natural gas industry increases in complexity, the risk of inadvertent noncompliance could also increase. If the Utilities fail to comply with applicable laws and regulations, whether existing or new, they could be subject to fines, penalties, business interruption or other enforcement action by the authorities that regulate the Utilities’ operations.

Federal safety and integrity regulations related to pipeline and storage operators and owners of critical infrastructure may impose significant costs and liabilities on the Company.

The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) requires pipeline and natural gas storage operators to develop integrity management programs to evaluate their pipelines comprehensively and to take additional measures to protect pipeline segments located in areas where a leak or rupture could potentially do the most harm.

The Company is required to maintain programs that are intended to assess pipeline integrity. Any repair, remediation, preventative or mitigating actions may require significant capital and operating expenditures. PHMSA constantly updates its regulations to ensure the highest levels of pipeline safety. As the operator of pipelines, Spire is required to:

• perform ongoing assessments of pipeline integrity;

• identify and characterize applicable threats to pipelines;

• improve data collection, integration and analysis;

• repair and remediate the pipeline as necessary; and

• implement preventative and mitigating actions.

The Transportation Security Administration (TSA) requires owners and operators of specified pipeline facilities to take action to prevent disruption and degradation to their infrastructure to achieve the following security outcomes:

• develop network segmentation policies and controls;

• create access control measures to secure and prevent unauthorized access to critical cyber systems;

• build continuous monitoring and detection policies and procedures to detect threats and correct anomalies; and

• reduce the risk of exploitation of unpatched systems in a timely manner using a risk-based methodology.

As such, pipeline owners and operators are required to establish and execute a TSA-approved Cybersecurity Implementation Plan, develop and maintain a Cybersecurity Incident Response Plan, and establish a Cybersecurity Assessment Program.

Costs to comply with these and other such future safety and integrity regulations are significant. Additionally, should the Company fail to comply with applicable statutes, rules, regulations and orders, it could be subject to significant fines, penalties, business interruption or other enforcement actions.

Environmental laws and regulations may require significant expenditures or increase operating costs.

The Utilities and Midstream companies are subject to federal, state and local environmental laws and regulations affecting many aspects of their present and future operations. These laws and regulations require these businesses to obtain and comply with a wide variety of environmental licenses, permits, inspections, and approvals. Failure to comply with these laws and regulations and failure to obtain any required permits and licenses may result in costs in the form of fines, penalties, business interruptions or other enforcement actions, which may be material. In addition, existing environmental laws and regulations could be revised or reinterpreted and/or new laws and regulations could be adopted or become applicable to these companies or their facilities, thereby impacting the cost of compliance. The discovery of presently unknown environmental conditions, including former manufactured gas plant sites, and adverse claims under environmental laws and regulations may result in expenditures and liabilities, which could be material. To the extent environmental compliance costs are self-insured, or not fully covered by insurance or recovered in rates from customers, those costs may have an adverse effect on financial condition and results of operations.

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The Utilities’ liquidity may be adversely affected by delays in recovery of their costs, due to regulation.

In the normal course of business, there is a lag between when the Utilities incur increases in certain of their costs and the time in which those costs are considered for recovery in the ratemaking process. Cash requirements for increased gas supply costs, operating costs, increased funding levels of defined benefit pension and postretirement costs, capital expenditures, interest expense and other increases in the costs of doing business, including inflation, can require outlays of cash prior to the authorization of increases in rates charged to customers, as approved by the MoPSC, APSC, or MSPSC. Accordingly, the Utilities’ liquidity can be adversely impacted to the extent higher costs are not timely recovered from their customers.

Changes to income tax policy, certain tax elections, tax regulations and future taxable income could adversely impact the Company’s financial condition and results of operations.

The Company has significantly reduced its current federal and state income tax obligations over the past few years through tax planning strategies and application of tax rules which included the use of bonus depreciation deductions for certain expenditures for property. As a result, the Company generated large annual taxable losses that have resulted in significant federal and state net operating losses. The Company plans to utilize these net operating losses in the future. The value of these net operating losses could be reduced if the Company cannot generate enough taxable income in the future to utilize all of the net operating losses generated prior to the Tax Cuts and Jobs Act of 2017 before they expire due to income tax policy changes, lower-than-expected financial performance and/or regulatory actions.

Changes to income tax policy, laws and regulations, including but not limited to changes in tax rates, the deductibility of certain expenses including interest and/or changes in the deductibility of certain expenditures for property, could adversely impact the Company. Those impacts could include reducing the value of its net operating losses and could result in material charges to earnings. Further, the Company’s financial condition and results of operations may be adversely impacted. Notably, the Inflation Reduction Act became effective on August 16, 2022. This new law provides various tax credits and incentives with respect to clean energy. The Company is still evaluating the impact and applicability of these programs to its operations, but they are not expected to have a material impact on the Company.

The Company may be involved in legal or administrative proceedings before various courts and governmental bodies that could adversely affect its results of operations and financial condition.

The Company may be involved in legal or administrative proceedings before various courts and governmental bodies with respect to general claims, rates, environmental issues, gas cost prudence reviews and other matters. For further details, see Contingencies in Note 16 to the financial statements in Item 8. Adverse decisions regarding these matters, to the extent they require the Company to make payments in excess of amounts provided for in its financial statements, or to the extent they are self-insured or not covered by insurance, could adversely affect the results of operations and financial condition.

Commodity markets and derivative instruments are regulated by federal agencies, and new developments in this area may adversely impact Spire Marketing’s results of operations and financial condition.

As a participant in the natural gas market, Spire Marketing is subject to applicable statutes, rules, regulations and orders administered by FERC and the Commodity Futures Trading Commission (CFTC), including those directed generally to prevent fraud or manipulation involving natural gas transactions (physical or financial transactions). Spire Marketing could be subject to fines, penalties, business interruption or other enforcement actions by the FERC or CFTC, or both, for failure to comply with such rules. New regulatory and legislative actions may adversely impact Spire Marketing’s results of operations and financial condition by potentially reducing customer growth opportunities and/or increasing the costs of doing business.

Spire Marketing uses bilateral contracts and derivative instruments such as futures contracts, options and swaps to hedge or mitigate ongoing commercial risks. Most standardized swaps, under the Dodd-Frank Act and regulations from the CFTC, are required to be cleared through a registered clearing facility and traded on a designated exchange or swap execution facility, subject to certain exceptions. These regulations may also require compliance with certain margin requirements for over-the-counter derivative contracts with certain regulated entities, which could adversely affect liquidity and ability to use derivatives to hedge risks. In addition, the CFTC’s rules require companies, including Spire Marketing, to maintain regulatory records of swap transactions, and to report swaps to centralized swap data repositories, among other compliance obligations.

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Although Spire Marketing may qualify for exceptions to certain of these CFTC rules, its derivatives counterparties are likely subject to capital, margin, documentation and business conduct requirements imposed as a result of the Dodd-Frank Act. These obligations may increase transaction costs and may make it more difficult for Spire Marketing to enter into hedging transactions on favorable terms or affect the number and/or creditworthiness of available swap counterparties. In that event, Spire Marketing’s inability to enter into derivatives instruments or other commercial risk hedging transactions on favorable terms, or at all, could increase operating expenses and expose it to unhedged commercial risks, including potential adverse changes in commodity prices.

In October 2020, the CFTC finalized its rules that modify and expand the applicability of speculative position limits on the amounts of certain futures contracts (including options thereon), cash-settled “lookalike” contracts for or linked to the commodities underlying the foregoing futures contracts, as well as economically equivalent swaps containing “identical material” contractual specifications, terms and conditions as the foregoing contracts. While Spire Marketing anticipates qualifying for a bona fide hedging exemption from such limits, the CFTC’s final rules and earlier adopted aggregation rules may cause Spire Marketing’s hedging strategies described above to be limited if Spire Marketing is unable to qualify for an exemption.

RISKS THAT RELATE TO OPERATIONAL FACTORS

The Company’s ability to meet its customers’ natural gas requirements may be impaired if contracted gas supplies, interstate pipeline and/or storage services are not available or delivered in a timely manner.

In order to meet their customers’ annual and seasonal natural gas demands, the Utilities must obtain sufficient supplies, interstate pipeline capacity, and storage capacity. If they are unable to obtain these, either from their suppliers’ inability to deliver the contracted commodity or the inability to secure replacement quantities, to the extent not mitigated by tariffs, contractual indemnification or insurance, the Utilities’ financial condition and results of operations may be adversely impacted. If a substantial disruption in interstate natural gas pipelines’ transmission and storage capacity were to occur during periods of heavy demand, the Utilities’ financial results could be adversely impacted.

Spire Marketing’s ability to deliver natural gas to its customers is contingent upon the performance of its suppliers and capability of pipeline and storage operators to fulfill delivery obligations to Spire Marketing under firm contracts. To the extent that it is unable to obtain the necessary supplies, Spire Marketing’s financial position and results of operations may be adversely impacted.

Midstream is dependent upon third-party pipelines and other facilities to provide delivery options to and from its facilities. If any pipeline connection were to become unavailable for volumes of natural gas due to repairs, damage to the facility, lack of capacity or any other reason, the ability to continue receiving or delivering natural gas could be restricted, and to the extent not mitigated by contractual indemnification, insurance or tariffs, would thereby reduce its revenues. Any permanent interruption that causes a material reduction in volumes could result in an impairment loss that could have a material adverse effect on the financial condition and results of operations.

Transporting, distributing, and storing natural gas and propane involves numerous risks that may result in accidents and other operating risks.

Natural gas transportation, distribution and storage activities inherently involve a variety of integrity issues, hazards and operations risks, such as leaks, accidental explosions, blowouts, damage caused by third parties, and mechanical problems, which could cause substantial financial losses. In addition, these risks could result in serious injury to employees and non-employees, loss of human life, significant damage to property, environmental pollution, impairment of operations, and substantial losses to the Company and its subsidiaries. The location of pipelines and storage facilities near populated areas, including residential areas, commercial business centers, and industrial sites, could increase the level of damages resulting from these risks. Similar risks also exist for Spire Missouri’s propane storage, transmission and minor distribution operations. These activities may subject the Company to litigation or administrative proceedings. Such litigation or proceedings could result in substantial monetary judgments, fines, penalties, business interruption or other enforcement actions against the Company and its subsidiaries or be resolved on unfavorable terms. In accordance with customary industry practices, the Utilities and other Spire businesses maintain insurance against a significant portion, but not all, of these risks and losses. To the extent the occurrence of any of these events is self-insured or not fully covered by insurance, it could adversely affect the financial condition and results of operations of the Company and its subsidiaries.

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Because of competition, the Company may not be able to retain existing customers or acquire new customers, or may be unsuccessful in retaining or acquiring contractual assets on favorable terms, which could have an adverse impact on its business, results of operations and financial condition.

The Utilities face the risk that larger commercial or industrial customers may bypass gas distribution services by directly connecting with interstate pipelines or, in the case of Spire Alabama and Spire Gulf, also from municipally or publicly owned gas distributors located adjacent to its service territory. The Utilities cannot provide any assurance that increased competition will not have a material adverse effect on their business, financial condition or results of operations.

The Utilities compete with distributors offering a broad range of services and prices, from full-service distributors to those offering delivery only. The Utilities also compete for retail customers with suppliers of alternative energy products, principally propane and electricity, and to a growing extent, distributed sources of renewable energy. If they are unable to compete effectively, the Utilities may lose existing customers and/or fail to acquire new customers, which in the aggregate could have a material adverse effect on their business, results of operations and financial condition. Along those lines, changes in wholesale natural gas prices compared with prices for electricity, fuel oil, coal, propane, or other energy sources can significantly impact the cost of delivered natural gas, which may affect the Utilities’ retention of natural gas customers and may adversely impact their financial condition and results of operations.

Spire Storage is subject to competition from similar services provided by pipelines and from competing independent storage providers capable of serving its customers. Natural gas storage is a competitive business, with competitors having the ability to expand storage capacity. Increased competition in the natural gas storage business could reduce the demand and drive rates down for the Company’s natural gas storage services.

Also, Spire Marketing profitability may be impacted by the effects of the expiration, in the normal course of business, of certain of its natural gas supply, sales, transportation and storage contracts if, because of competition or other reasons, those contracts cannot be replaced and/or renewed with arrangements with similar terms and pricing.

Significantly warmer-than-normal weather conditions and the effects of climate change may affect the Utilities’ sale of heating energy and adversely impact their financial position and results of operations.

The Utilities’ earnings are primarily generated by the sale of heating energy. Spire Missouri and Spire Mississippi each have a Weather Normalization Adjustment rider, Spire Alabama has a Temperature Adjustment Rider, and Spire Gulf has a Weather Impact Normalization Factor. These mechanisms, approved by the respective state regulatory body, provide better assurance of the recovery of fixed costs and margins during winter months despite variations in sales volumes due to the impacts of weather, while the annual rate designs of Alabama and Mississippi help adjust for other factors that affect customer usage. However, significantly warmer-than-normal weather conditions in the Utilities’ service areas and other factors, such as climate change, alternative energy sources and increased efficiency of gas furnaces and other appliances, may result in reduced profitability and decreased cash flows attributable to lower gas sales. Furthermore, these mechanisms do not fully mitigate the impact of warmer weather and continuation of these adjustment factors is subject to regulatory discretion.

To the extent climate change results in warmer temperatures, financial results could be adversely affected through lower gas volumes and revenues and reduced marketing opportunities. Management believes it is likely that any such resulting impacts would occur over a long period of time and thus would be difficult to quantify with any degree of specificity. Another possible impact of climate change may be more frequent and more severe weather events, such as significant wind or flooding events, which could increase costs to repair damaged facilities and restore service to customers or result in lost revenues if the Company were unable to deliver natural gas to customers. Such weather events could also disrupt our usual gas supplies and make it impossible or extremely costly to find replacement gas for our customers. To the extent such impacts are self-insured, or not covered by insurance or recovered in rates, the foregoing events could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s natural gas storage business includes inherent geologic and operational risks.

The Company plans to continue to increase capacity, improve operating performance, and improve the integrity of its storage fields and associated above-ground facilities of Spire Storage. Construction of such assets is subject to various risks and uncertainties, including supply chain and labor disruptions, weather conditions during construction, equipment failures and construction quality issues. Any such disruptions, as well as any negative effects from the risks discussed below, could result in an impairment of Spire's investment in the project, and such impairment could have a material adverse effect on the Company's financial condition and results of operations. 

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Any damage to the Spire Storage facilities or pipelines, or lack of integrity to its storage fields, including damages caused by a blow-out, to the extent such impacts are self-insured or not covered by insurance, could have a material adverse effect on the Company’s financial condition and results of operations.

The Company does not own all the land on which its storage facilities were constructed, and it is, therefore, subject to the possibility of more onerous terms or increased costs to retain necessary land use, if and when applicable property rights expire or are renewed. Changes in the terms of such land use could have an adverse impact on the financial condition and results of operations of the Company’s storage business.

Increased dependence on technology may hinder the Company’s business operations and adversely affect their financial condition and results of operations if such technologies fail.

The Company has implemented or acquired a variety of technological tools including both Company-owned information technology and technological services provided by outside parties. These tools and systems support critical functions including the Company’s integrated planning, scheduling and dispatching of field resources, its automated meter reading system, customer care and billing, procurement and accounts payable, operational plant logistics, management reporting, and external financial reporting. The failure of these or other similarly important technologies, or the Company’s inability to have these technologies supported, updated, expanded, or integrated into other technologies, could hinder its business operations and, to the extent such impacts are self-insured or not covered by insurance, could adversely impact its financial condition and results of operations.

Although the Company has, when possible, developed alternative sources of technology and built redundancy into its computer networks and tools, there can be no assurance these efforts to date would protect against all potential issues related to the loss of any such technologies or the Company’s use of such technologies.

A cyberattack may disrupt the Company’s operations or lead to a loss or misuse of confidential and proprietary information or potential liability.

The Company is subject to cybersecurity risks primarily related to breaches of security pertaining to sensitive customer, employee, and vendor information maintained by the Company, its subsidiaries, or its third-party vendors in the normal course of business, as well as breaches in the technology that manages natural gas supply and control operations and other business processes. A loss of confidential or proprietary data or security breaches of technology for operations or business processes could adversely affect the Company’s reputation, diminish customer confidence, disrupt operations, and subject the Company to possible financial liability, any of which could have a material effect on its financial condition and results of operations.

The Company acknowledges increased dependence on technology increases its exposure to cyberattack. The Company closely monitors both preventive and detective measures to manage these risks and maintain cyber risk insurance to mitigate a significant portion, but not all, of these risks and losses. To the extent that the occurrence of any of these cyber events is self-insured or not covered by insurance, it could adversely affect the Company’s financial condition and results of operations.

The Company’s business activities are concentrated in a few states and regions.

The Utilities provide natural gas distribution services to customers in Alabama, Mississippi, and Missouri. Midstream is focused on the Rocky Mountain/Western and Midcontinent regions. Changes in the regional economies, politics, regulations and weather patterns of these states could negatively impact growth opportunities and the usage patterns and financial condition of customers and could adversely affect earnings, cash flows, and financial position.

RISKS THAT RELATE TO FINANCIAL, ECONOMIC AND MARKET FACTORS

As a holding company, Spire depends on its operating subsidiaries to meet its financial obligations.

Spire is a holding company with no significant assets other than the stock of its operating subsidiaries and cash investments. Spire, and Spire Missouri prior to the holding company’s formation in 2000, has paid common stock dividends continuously since 1946. Spire’s ability to pay dividends to its shareholders is dependent on the ability of its subsidiaries to generate sufficient net income and cash flows to pay upstream dividends and make loans or loan repayments.

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A downgrade in Spire’s and/or its subsidiaries’ credit ratings and/or reduced access to credit and capital markets may negatively affect its cost of capital or prevent it from executing operating strategies.

Currently, Spire, Spire Missouri, and Spire Alabama have investment-grade credit ratings. There is no assurance such credit ratings for any of these companies will remain in effect for any given period of time or such ratings will not be lowered, suspended or withdrawn entirely by the rating agencies, if, in each rating agency’s judgment, circumstances so warrant. Spire has a working capital line of credit to meet its short-term liquidity needs. Spire’s line of credit may be used to meet the liquidity needs of any of its subsidiaries, subject to sublimits. If the rating agencies lowered the credit rating at any of these entities, particularly below investment grade, it might significantly limit that entity’s ability to secure new or additional credit facilities and would increase its costs of borrowing. Spire’s and the Utilities’ ability to borrow under current or new credit facilities and costs of that borrowing have a direct impact on their ability to execute their operating strategies.

Spire Marketing relies on its cash flows, ability to effect net settlements with counterparties, parental guaranties, and access to Spire’s liquidity resources to satisfy its credit and working capital requirements. Spire Marketing’s ability to rely on parental guaranties is dependent upon Spire’s financial condition and credit ratings. If Spire’s credit ratings were lowered, particularly below investment grade, counterparty acceptance of parental guaranties may diminish, resulting in decreased availability of credit. Additionally, under such circumstances, certain counterparties may require Spire Marketing to provide prepayments or cash deposits, amounts of which would be dependent upon natural gas market conditions. Reduced access to credit or increased credit requirements, which may also be caused by factors such as higher overall natural gas prices, may limit Spire Marketing’s ability to enter into certain transactions. In addition, Spire Marketing has concentrations of counterparty credit risk in that a significant portion of its transactions are with (or are associated with) utility companies and their marketing affiliates. The concentration of counterparties has the potential to affect the Company’s overall exposure to credit risk, either positively or negatively, in that customers in this group may be affected similarly by changes in economic, industry, or other conditions. Spire Marketing also has concentrations of credit risk in certain individually significant counterparties. Spire Marketing closely monitors its credit exposure and, although uncollectible amounts have not been significant, increased counterparty defaults are possible and may result in financial losses and/or capital limitations.

Regional supply/demand imbalances, fluctuations in natural gas commodity prices, changes in the terms and rates charged by midstream facilities, and infrastructure projects may adversely impact the future profitability of the Company.

Competition in the marketplace and fluctuations in natural gas commodity prices have a direct impact on Spire Marketing. Changing market conditions and prices, the narrowing of regional and seasonal price differentials and limited future price volatility may adversely impact its sales margins or affect its ability to procure gas supplies and/or to serve certain customers, which may reduce sales profitability and/or increase certain credit requirements caused by reductions in netting capability. Although the FERC regulates the interstate transportation of natural gas and establishes the general terms and conditions under which Spire Marketing may use interstate gas pipeline capacity to purchase and transport natural gas, Spire Marketing must occasionally renegotiate its transportation agreements with a concentrated group of pipeline companies. Renegotiated terms of new agreements, or increases in FERC-authorized rates of existing agreements, may impact Spire Marketing’s future profitability. Profitability may also be adversely impacted if pipeline capacity or future storage capacity secured is not fully utilized.

Storage businesses are affected by various gas market fundamentals which impact the level of demand for storage services and the rates that can be charged for these services. These market fundamentals include: seasonal price spread; monthly, daily and hourly price volatility; locational basis for pricing points on pipelines connected to a storage facility; seasonal, daily and hourly weather; and operational impacts in supply and market areas served by a storage facility and its connected pipelines. These fundamentals have varying and potentially material adverse impacts on the various services offered by storage facilities and the rates that can be charged for these services in the market. These services include long-term firm storage, short-term park and loan, wheeling, and optimization. Rates below the variable costs to operate a storage facility could result in a decision to not operate all the capacity in the facility or to operate the facility at a loss if required to fulfill firm customer contract obligations. A sustained decline in these rates or a shut-in of all or a portion of one or more facilities’ capacity could have an adverse impact on the Company’s financial condition and results of operations.

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Spire Missouri’s and Spire Alabama’s income from off-system sales and capacity release is subject to fluctuations in market conditions and changing supply and demand conditions in areas the Utilities hold pipeline capacity rights. Specific factors impacting the Utilities’ income from off-system sales and capacity release include the availability of attractively priced natural gas supply, availability of pipeline capacity, and market demand. Income from off-system sales and capacity release is shared with customers. Spire Missouri and Spire Alabama are allowed to retain 25% of the net margins achieved as a result of such off-system sales and capacity release. The Utilities’ ability to retain such income in the future is also subject to regulatory discretion.

Rapid significant increases in natural gas prices may adversely affect the Utilities’ liquidity and, in certain circumstances, results of operations.

The tariff rate schedules of Spire Missouri, Spire Gulf and Spire Mississippi contain Purchased Gas Adjustment (PGA) clauses and Spire Alabama’s tariff rate schedule contains a Gas Supply Adjustment (GSA) rider that permit the Utilities to file for rate adjustments to recover the cost of purchased gas. Changes in the cost of purchased gas are flowed through to customers and may affect uncollectible amounts and cash flows and can therefore impact the amount of capital resources.

Currently, Spire Missouri is allowed to adjust the gas cost component of rates up to four times each year while Spire Alabama and Spire Gulf (collectively, the “Alabama Utilities”) and Spire Mississippi may adjust the gas cost component of their rates on a monthly basis. Spire Missouri must make a mandatory gas cost adjustment at the beginning of the winter, in November, and during the next twelve months may make up to three additional discretionary gas cost adjustments, so long as each of these adjustments is separated by at least two months.

The MoPSC typically approves the Spire Missouri PGA changes on an interim basis, subject to refund and the outcome of a subsequent audit and prudence review. Due to such review process, there is a risk of a disallowance of full recovery of these costs. Any material disallowance of purchased gas costs would adversely affect results of operations. The Alabama Utilities’ gas supply charges are submitted for APSC review on a monthly basis, regardless of whether there is a request for a change, so prudence review occurs on an ongoing basis. Spire Mississippi’s PGA is adjusted on a monthly basis for the most recent charges and is filed at the MSPSC on a monthly basis.

Increases in the prices the Utilities charge for gas may also adversely affect revenues because they could lead customers to reduce usage and cause some customers to have trouble paying the resulting higher bills. These higher prices may increase bad debt expenses and ultimately reduce earnings. Rapid increases in the price of purchased gas may result in an increase in short-term debt.

To lower financial exposure to commodity price fluctuations, Spire Missouri enters into contracts to hedge the forward commodity price of its natural gas supplies. As part of this strategy, Spire Missouri may use fixed-price forward physical purchase contracts, swaps, futures, and option contracts. However, Spire Missouri does not hedge the entire exposure of energy assets or positions to market price volatility, and the coverage will vary over time. Any costs, gains, or losses experienced through hedging procedures, including carrying costs, generally flow through the PGA clause, thereby limiting Spire Missouri’s exposure to earnings volatility. However, variations in the timing of collections of such gas costs under the PGA clause and the effect of cash payments for margin deposits associated with Spire Missouri’s use of natural gas derivative instruments may cause short-term cash requirements to vary. These procedures remain subject to prudence review by the MoPSC.

Other than fixed-price forward physical purchase contracts, Spire Alabama, Spire Gulf, and Spire Mississippi currently do not utilize risk mitigation strategies that incorporate commodity hedge instruments, but Spire Alabama has the ability to do so through its GSA.

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Risk management policies, including the use of derivative instruments, may not fully protect Spire Marketing’s sales and results of operations from volatility and may result in financial losses.

In the course of its business, Spire Marketing enters into contracts to purchase and sell natural gas at fixed prices and index-based prices. Commodity price risk associated with these contracts has the potential to impact earnings and cash flows. To minimize this risk, Spire Marketing has a risk management policy that provides for daily monitoring of a number of business measures, including fixed price commitments.

Spire Marketing currently manages the commodity price risk associated with fixed-price commitments for the purchase or sale of natural gas by either closely matching the offsetting physical purchase or sale of natural gas at fixed prices or through the use of natural gas futures, options, and swap contracts traded on or cleared through the New York Mercantile Exchange, Inc. and/or the Intercontinental Exchange to lock in margins. These exchange-traded/cleared contracts may be designated as cash flow hedges of forecasted transactions. However, market conditions and regional price changes may cause ineffective portions of matched positions to result in financial losses. Additionally, to the extent that Spire Marketing’s natural gas contracts are classified as trading activities or do not otherwise qualify for the normal purchases or normal sales designation (or the designation is not elected), the contracts are recorded as derivatives at fair value each period. Accordingly, the associated gains and losses are reported directly in earnings and may cause volatility in results of operations. Gains or losses (realized and unrealized) on certain wholesale purchase and sale contracts, consisting of those classified as trading activities, are required to be presented on a net basis (instead of a gross basis) in the statements of consolidated income. Such presentation could result in volatility in the Company’s operating revenues.

Spire’s pension and other postretirement benefit plans are subject to investment and interest rate risk that could negatively impact its financial condition.

Spire and its subsidiaries have pension and other postretirement benefit plans that provide benefits to many of their employees and retirees. Costs of providing benefits and related funding requirements of these plans are subject to changes in the market value of the assets that fund the plans. The funded status of the plans and the related costs reflected in the Company’s financial statements are affected by various factors, which are subject to an inherent degree of uncertainty, including economic conditions, financial market performance, interest rates, life expectancies and demographics. Recessions and volatility in the domestic and international financial markets have negatively affected the asset values of the Company’s pension plans at various times in the past. Poor investment returns or lower interest rates may necessitate accelerated funding of the plans to meet minimum federal government requirements, which could have an adverse impact on the Company’s financial condition and results of operations. For more information, including regulatory provisions affecting the Utilities’ plans, see Note 13, Pension Plans and Other Postretirement Benefits, of the Notes to Financial Statements in Item 8.

In connection with acquisitions, Spire and Spire Missouri recorded goodwill and long-lived assets that could become impaired and adversely affect its financial condition and results of operations.

Spire and Spire Missouri assess goodwill for impairment annually or more frequently if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. The Company and Spire Missouri assess their long-lived assets for impairment whenever events or circumstances indicate an asset’s carrying amount may not be recoverable. To the extent the value of goodwill or long-lived assets becomes impaired, the Company and Spire Missouri may be required to incur impairment charges that could have a material impact on their results of operations.

Since interest rates are a key component, among other assumptions, in the models used to estimate the fair values of the Company’s reporting units, rises in interest rates would generally decrease the calculated fair values and future impairments may occur. Due to the subjectivity of the assumptions and estimates underlying the impairment analysis, Spire and Spire Missouri cannot provide assurance that future analyses will not result in impairment. These assumptions and estimates include projected cash flows, current and future rates for contracted capacity, growth rates, weighted average cost of capital and market multiples.

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GENERAL RISK FACTORS

Resources expended to pursue or integrate business acquisitions, investments or other business arrangements may adversely affect Spire’s financial position and results of operations and return on investments made may not meet the Company’s expectations.

From time to time, Spire may seek to grow through strategic acquisitions, investments or other business arrangements. Attractive acquisition and investment opportunities may be difficult to complete on economically acceptable terms. It is possible for Spire to expend considerable resources pursuing acquisitions and investments that for a variety of reasons do not move forward. Similarly, investment opportunities may be hindered or halted by regulatory or legal actions. To the extent acquisitions or investments are made, such transactions involve a number of risks, including but not limited to, the assumption of material liabilities, the diversion of management’s attention from daily operations, difficulties in assimilation and retention of employees, securing adequate capital to support the transaction, and obtaining regulatory approval. Uncertainties exist in assessing the value, risks, profitability, and liabilities associated with certain businesses or assets and there is a possibility that anticipated operating and financial efficiencies expected to result from an acquisition or investment do not develop. Additionally, there are no assurances resources expended will achieve their intended result.

The failure to complete an acquisition successfully or to integrate acquisitions or investments it may undertake could have an adverse effect on the Spire’s financial condition and results of operations and the market’s perception of the Company’s execution of its strategy. To the extent Spire engages in any of the above activities together with or through one or more of its subsidiaries, including the Utilities, such subsidiaries may face the same risks.

Unexpected losses may adversely affect Spire’s or its subsidiaries’ financial condition and results of operations.

As with most businesses, there are operations and business risks inherent in the activities of Spire’s subsidiaries. If, in the normal course of business, Spire or any of its subsidiaries becomes a party to litigation, such litigation could result in substantial monetary judgments, fines, penalties, business interruption or other enforcement actions or be resolved on unfavorable terms. In accordance with customary practice, Spire and its subsidiaries maintain insurance against a significant portion of, but not all, risks and losses, though it does reinsure a portion of the risk from certain of Spire’s insurers through its captive insurance company. Spire and its operating companies employ many strategies to gain assurance such risks are appropriately managed, mitigated, or insured, as appropriate. To the extent a loss is self-insured or not fully covered by insurance or other risk mitigation strategies, that loss could adversely affect Spire’s and/or its subsidiaries’ financial condition and results of operations.

Catastrophic events may adversely affect the Company’s facilities and operations.

Catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes, tropical storms, winter storms, terrorist acts, acts of civil unrest, pandemic illnesses or other similar occurrences could adversely affect the Utilities’ facilities and operations, as well as those of Midstream. Emergency planning and training programs are in place to respond to events that could cause business interruptions; however, unanticipated events or a combination of events, failure in resources needed to respond to events, or slow or inadequate response to events may have an adverse impact. To the extent the impacts of such catastrophic events are not covered by insurance or recovered in rates, this could have a material adverse effect on the Company's financial condition and results of operations.

Workforce risks may affect the Company’s financial results.

The Company and its subsidiaries are subject to various workforce risks, including, but not limited to, the risk that it will be unable to attract and retain qualified personnel; that it will be unable to effectively transfer to new personnel the knowledge and expertise of an aging workforce as those workers retire; and that it will be unable to reach collective bargaining arrangements with the unions that represent certain of its workers, which could result in work stoppages.

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The Company may be adversely affected by economic conditions.

Periods of slowed economic activity generally result in decreased energy consumption, particularly by industrial and large commercial companies, a loss of existing customers, and fewer new customers. As a consequence, national or regional recessions or other downturns in economic activity could adversely affect revenues and cash flows or restrict future growth. Economic conditions in the Utilities’ service territories may also adversely impact the Utilities’ ability to collect accounts receivable, resulting in an increase in bad debt expense.

Changes in accounting standards may adversely impact the Company’s financial condition and results of operations.

Spire and its subsidiaries are subject to changes in U.S. generally accepted accounting principles (GAAP), SEC regulations and other interpretations of financial reporting requirements for public utilities. Neither the Company nor any of its subsidiaries have any control over the impact these changes may have on their financial condition or results of operations nor the timing of such changes. The potential issues associated with rate-regulated accounting, along with other potential changes to GAAP that the U.S. Financial Accounting Standards Board (FASB) continues to consider may be significant.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

Spire

Refer to the information below about the principal properties of Spire Missouri and Spire Alabama. The Spire EnergySouth utilities own more than 5,000 miles of pipelines. Other properties of Spire and its subsidiaries do not constitute a significant portion of its properties. The current leases for office space in downtown St. Louis commenced in early 2015, with terms ranging from 10 to 20 years, with multiple renewal options. For further information on leases see Note 17, Leases, of the Notes to Financial Statements in Item 8.

Spire Missouri

The principal properties of Spire Missouri consist of its gas distribution system, which includes more than 32,000 miles of main and related service lines, odorization and regulation facilities, and customer meters. The mains and service lines are located in municipal streets or alleys, public streets or highways, or on lands of others for which Spire Missouri has obtained the necessary legal rights to place and operate its facilities on such property. Spire Missouri has an underground natural gas storage facility, several operating centers, and other related properties. Substantially all of Spire Missouri’s utility plant is subject to the liens of its mortgage. All the properties of Spire Missouri are held in fee, by easement, or under lease agreements.

Spire Alabama

The properties of Spire Alabama consist primarily of its gas distribution system, which includes more than 24,000 miles of main and related service lines, odorization and regulation facilities, and customer meters. The mains and service lines are located in municipal streets or alleys, public streets or highways, or on lands of others for which Spire Alabama has obtained the necessary legal rights to place and operate its facilities on such property. Spire Alabama also has four LNG facilities, several operating centers, and other related properties. All of the properties of Spire Alabama are held in fee, by easement, or under lease agreements.

Item 3. Legal Proceedings

For a description of pending regulatory matters of Spire, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8. For a description of environmental and other legal matters, see Contingencies in Note 16 of the Notes to Financial Statements in Item 8.

Item 4. Mine Safety Disclosures

Not applicable.

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INFORMATION ABOUT OUR EXECUTIVE OFFICERS – Listed below are executive officers as defined by the SEC for Spire as of November 16, 2023, along with their ages (as of September 30, 2023), positions and business experience during the past five years.

Name	Age	Position with Company (1)	Appointed (2)
S. L. Lindsey	57	President and Chief Executive Officer	October 2023
		Executive Vice President, Chief Operating Officer (until October 2023)	January 2020
		Executive Vice President, Chief Executive Officer of Gas Utilities and Distribution Operations (until December 2019)	October 2012
		Chief Executive Officer, Spire Missouri	December 2018
		Chief Executive Officer, Spire Alabama	September 2014
S. Sitherwood (3)	63	Executive Vice President, Senior Advisor	October 2023
		President and Chief Executive Officer (until October 2023)	February 2012
		Chairman of the Board, Spire Missouri	January 2015
		Chairman of the Board, Spire Alabama	September 2014
S. P. Rasche	63	Executive Vice President and Chief Financial Officer	November 2013
		Chief Financial Officer, Spire Missouri (until January 2020)	May 2012
		Chief Financial Officer, Spire Alabama (until January 2020)	September 2014
M. C. Darrell (4)	65	Senior Vice President, Chief Legal and Compliance Officer	May 2012
M. C. Geiselhart	64	Senior Vice President, Chief Strategy and Corporate Development Officer	January 2015

(1)	The information provided relates to the Company and its principal subsidiaries. Many of the executive officers have served or currently serve as officers or directors for other subsidiaries of the Company.
(2)	Officers of Spire are normally reappointed by its Board of Directors in November of each year. Officers of Spire Missouri and Spire Alabama are normally reappointed by their boards of directors in January of each year.
(3)	Ms. Sitherwood has announced she will retire effective January 1, 2024.
(4)	Mr. Darrell has announced he will retire effective December 1, 2023.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Spire

Spire’s common stock trades on The New York Stock Exchange (NYSE) under the symbol “SR”. The number of holders of record as of November 10, 2023 was 2,531.

Dividends are payable on the Company’s common stock at the discretion of its Board of Directors (the “Board”). Spire, and Spire Missouri prior to the holding company’s formation in 2000, has paid common stock dividends continuously since 1946, with 2023 marking the 20th consecutive year of increasing dividends on an annualized basis. Although the Board expects to continue paying dividends on the common stock for the foreseeable future, the declaration of dividends is not guaranteed. The amount of dividends on the common stock, if any, will depend upon the Company’s financial condition, results of operations, capital requirements, and other factors.

Performance Graph

COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURN*

September 30	2018		2019		2020		2021		2022		2023
Spire Inc.	$	100.00	$	122.09	$	77.17	$	92.14	$	97.66	$	92.65
S&P 500 Utilities Index		100.00		127.10		120.79		134.09		141.56		131.63
S&P 500 Index		100.00		104.25		120.05		156.07		131.92		160.44

* Cumulative total return is based on a $100 investment on September 30, 2018, assuming reinvestment of dividends.

The S&P 500 Utilities Index is comprised of 30 utilities heavily weighted to large capitalization (median market cap of $22.3 billion) electric utilities. In 2023, stocks of small and mid cap electric utilities and gas utility companies (like Spire) in general traded lower relative to the large cap electric sector.

For disclosures related to securities authorized for issuance under equity compensation plans, see Note 3, Stock-Based Compensation, of the Notes to Financial Statements in Item 8.

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During the three months ended September 30, 2023, the only repurchases of the Company’s common stock were pursuant to elections by employees to have shares of stock withheld to cover employee tax withholding obligations upon the vesting of performance-based and time-vested restricted stock and stock units. The following table provides information on those repurchases:

Period	(a) Total Number of Shares Purchased	(b) Average Price Paid Per Share	(c) Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number of Shares that May Yet be Purchased Under the Plans or Programs
July 1, 2023 – July 31, 2023	—	—	—	—
August 1, 2023 – August 31, 2023	—	—	—	—
September 1, 2023 – September 30, 2023	749	$60.65	—	—
Total	749	$60.65	—	—

Spire Missouri

Spire Missouri common stock is owned by its parent, Spire Inc., and is not traded on any stock exchange.

Spire Missouri’s mortgage contains restrictions on its ability to pay cash dividends on its common stock, as described in further detail in Note 5, Shareholders’ Equity, of the Notes to Financial Statements in Item 8. As of September 30, 2023 and 2022, the amount under the mortgage’s formula that was available to pay dividends was $1,678.5 million and $1,579.4 million, respectively.

Spire Alabama

Spire Alabama common stock is owned by its parent, Spire Inc., and is not traded on any stock exchange.

Item 6. (Reserved)

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

(Dollars in millions, except per share and per unit amounts)

INTRODUCTION

This section analyzes the financial condition and results of operations of Spire Inc. (the “Company”), Spire Missouri Inc., and Spire Alabama Inc. Spire Missouri, Spire Alabama and Spire EnergySouth are wholly owned subsidiaries of the Company. Spire Missouri, Spire Alabama and the subsidiaries of Spire EnergySouth are collectively referred to as the “Utilities.” The subsidiaries of Spire EnergySouth are Spire Gulf and Spire Mississippi. This section includes management’s view of factors that affect the respective businesses of the Company, Spire Missouri and Spire Alabama, explanations of financial results including changes in earnings and costs from the prior periods, and the effects of such factors on the Company’s, Spire Missouri’s and Spire Alabama’s overall financial condition and liquidity. Unless otherwise indicated, references to years herein are references to the fiscal years ending September 30 for the Company and its subsidiaries.

Reference is made to “Item 1A. Risk Factors” and “Forward-Looking Statements,” which describe important factors that could cause actual results to differ from expectations and non-historical information contained herein. In addition, the following discussion should be read in conjunction with the audited financial statements and accompanying notes thereto of Spire, Spire Missouri and Spire Alabama included in “Item 8. Financial Statements and Supplementary Data.”

OVERVIEW

The Company has three reportable segments: Gas Utility, Gas Marketing, and Midstream. Most of Spire’s earnings are derived from its Gas Utility segment, which reflects the regulated activities of the Utilities. Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings of Spire and each of the Utilities are typically concentrated during the heating season of November through April each fiscal year.

Gas Utility - Spire Missouri

Spire Missouri is Missouri’s largest natural gas distribution utility and is regulated by the MoPSC. Spire Missouri serves St. Louis, Kansas City, and other areas throughout the state. Spire Missouri purchases natural gas in the wholesale market from producers and marketers and ships the gas through interstate pipelines into its own distribution facilities for sale to residential, commercial and industrial customers. Spire Missouri also transports gas through its distribution system for certain larger customers who buy their own gas on the wholesale market. Spire Missouri delivers natural gas to customers at rates and in accordance with tariffs authorized by the MoPSC. The earnings of Spire Missouri are primarily generated by the sale of heating energy.

Gas Utility - Spire Alabama

Spire Alabama is the largest natural gas distribution utility in the state of Alabama and is regulated by the APSC. Spire Alabama’s service territory is located in central and northern Alabama. Among the cities served by Spire Alabama are Birmingham, the center of the largest metropolitan area in the state, and Montgomery, the state capital. Spire Alabama purchases natural gas through interstate and intrastate suppliers and distributes the purchased gas through its distribution facilities for sale to residential, commercial, and industrial customers and other end-users of natural gas. Spire Alabama also transports gas through its distribution system for certain large commercial and industrial customers for a transportation fee. Effective December 1, 2020, for most of these transportation service customers, Spire Alabama also purchases gas on the wholesale market for sale to the customer upon delivery to the Spire Alabama distribution system. All Spire Alabama services are provided to customers at rates and in accordance with tariffs authorized by the APSC.

Gas Utility - Spire EnergySouth

Spire Gulf and Spire Mississippi are utilities engaged in the purchase, retail distribution and sale of natural gas to approximately 100,000 customers in southern Alabama and south-central Mississippi. Spire Gulf is regulated by the APSC, and Spire Mississippi is regulated by the MSPSC.

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Gas Marketing

Spire Marketing is engaged in the marketing of natural gas and related activities on a non-regulated basis and is reported in the Gas Marketing segment. Spire Marketing markets natural gas to customers across the U.S. (and into Canada), including customers inside and outside of the Utilities’ service areas. It holds firm transportation and storage contracts in order to effectively manage its transactions with counterparties, which primarily include producers, municipalities, electric and gas utility companies, and large commercial and industrial customers.

Midstream

Spire’s midstream operations consist of Spire STL Pipeline and Spire Storage (composed of Spire Storage West LLC and Spire Salt Plains Storage LLC). Spire STL Pipeline owns and operates a FERC-regulated 65-mile pipeline connecting the Rockies Express Pipeline in Scott County, Illinois, to delivery points in St. Louis County, Missouri, including Spire Missouri’s storage facility. Spire STL Pipeline’s operating revenue is derived primarily from Spire Missouri as its foundation shipper. Spire Storage is engaged in the storage of natural gas in the western region of the U.S. Spire Storage consists of two storage fields in Wyoming operating under one FERC market-based rate tariff, and a storage field in Oklahoma that operates under intrastate jurisdiction with authorizations from FERC under Section 311 of the Natural Gas Policy Act to provide certain interstate storage, transportation, and hub services.

Other

Other components of the Company’s consolidated information include Spire's subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.

Business Evaluation Factors

Based on the nature of the business of the Company and its subsidiaries, as well as current economic conditions, management focuses on several key variables in evaluating the financial condition and results of operations and managing the business.

For the Gas Utility segment, these include:

•  the Utilities’ ability to recover from their customers the costs of purchasing and distributing natural gas;

•  the impact of weather and other factors, such as customer conservation, on revenues and expenses;

•  changes in the regulatory environment at the federal, state, and local levels, as well as decisions by regulators, that impact the Utilities’ ability to earn the authorized rate of return and recover prudent costs in each of the service territories they serve;

•  the Utilities’ ability to access credit markets and maintain working capital sufficient to meet operating requirements;

•  the effect of natural gas price volatility on the business; and

•  the ability to manage costs, integrate and standardize operations, and upgrade infrastructure.

In the Gas Marketing segment, these include:

•  the risks of competition;

•  fluctuations and volatility in natural gas prices;

•  the changing flow and availability of natural gas;

•  new national infrastructure projects;

•  the ability to procure firm transportation and storage services at reasonable rates;

•  credit and/or capital market access; and

•  counterparty risks.

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In the Midstream segment, these include:

• the impact of seasonal weather patterns;

• fluctuations and volatility in natural gas prices;

• the changing flow and availability of natural gas;

• the efficiency of the injection and withdrawal processes for natural gas storage;

• competitive factors in the energy industry;

• energy and other regulation in Spire's storage and transportation service areas; and

• counterparty risks.

Further information regarding how management seeks to manage these key variables is discussed below.

Gas Utility

The Utilities seek to provide reliable natural gas services at a reasonable cost, while maintaining and building secure and dependable infrastructures. The Utilities’ strategies focus on improving both performance and the ability to recover their authorized distribution costs and rates of return. The Utilities’ distribution costs are the essential, primarily fixed, expenditures they must incur to operate and maintain more than 60,000 miles of mains and services comprising their natural gas distribution systems and related storage facilities.

The Utilities’ distribution costs include wages and employee benefit costs, depreciation and maintenance expenses, and other regulated utility operating expenses, excluding natural and propane gas expense. Distribution costs are considered in the rate-making process, and recovery of these types of costs is included in revenues generated through the Utilities’ tariff rates. Spire Missouri’s tariff rates are approved by the MoPSC, whereas Spire Alabama’s tariff rates are approved by the APSC. Spire Gulf and Spire Mississippi have tariff rates that are approved by the APSC and MSPSC, respectively.

Spire Missouri and Spire Alabama also have off-system sales and capacity release income streams that are regulated by tariff but remain subject to fluctuations in market conditions. Some of the factors impacting the level of off-system sales include the availability and cost of Spire’s natural gas supply, the weather in its service areas and the weather in other markets. When Spire’s service areas experience warmer-than-normal weather while other markets experience colder weather or supply constraints, some of Spire’s natural gas supply is available for sale to third parties not on Spire’s system.

The Utilities work actively to reduce the impact of wholesale natural gas price volatility on their costs by strategically structuring their natural gas supply portfolios to increase their gas supply availability and pricing alternatives. They may also use derivative instruments to hedge against significant changes in the commodity price of natural gas. Nevertheless, the overall cost of purchased gas remains subject to fluctuations in market conditions. The Purchased Gas Adjustment (PGA) clause of Spire Missouri, Spire Gulf and Spire Mississippi and the Gas Supply Adjustment (GSA) rider of Spire Alabama allow the Utilities to flow through to customers, subject to prudence review by the public service commissions, the cost of purchased gas supplies, including costs, cost reductions and related carrying costs associated with the use of derivative instruments to mitigate volatility in the cost of natural gas. As of September 30, 2023, Spire Missouri had active derivative positions, but Spire Alabama has had no gas supply derivative instrument activity since 2010. The Utilities believe they will continue to be able to obtain sufficient gas supply. The price of natural gas supplies and other economic conditions may affect sales volumes, due to the conservation efforts of customers, and cash flows associated with the timing of collection of gas costs and related accounts receivable from customers.

The Utilities rely on short-term credit and long-term capital markets, as well as cash flows from operations, to satisfy their seasonal cash requirements and fund their capital expenditures. The Utilities access the commercial paper market through a program administered by the holding company, which then loans borrowed funds to the Utilities. The Utilities directly access the long-term bond market. Access to debt markets is dependent on current conditions in the credit and capital markets. Management focuses on maintaining a strong balance sheet and believes the Utilities currently have adequate access to credit and capital markets and will have sufficient liquidity and capital resources to meet their foreseeable obligations. See the “Liquidity and Capital Resources” section for additional information.

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Gas Marketing

Spire Marketing utilizes its natural gas supply agreements, transportation agreements, park and loan agreements, storage agreements and other executory contracts to support a variety of services to its customers at competitive prices. It closely monitors and manages the natural gas commodity price and volatility risks associated with providing such services to its customers through the use of a variety of risk management activities, including the use of exchange-traded/cleared derivative instruments and other contractual arrangements. Spire Marketing is committed to managing commodity price risk while it seeks to expand the services that it now provides. Nevertheless, income from the Gas Marketing operations is subject to more fluctuations in market conditions than the Utilities’ operations.

The Gas Marketing business is directly impacted by the effects of competition in the marketplace, the impacts of new infrastructure, surplus natural gas supplies, and the addition of new demand from exports, power generation and industrial load. Spire Marketing’s management expects a growing need for marketing services across the country as customers manage seasonal variability and marketplace volatility.

In addition to its own operating cash flows, Spire Marketing relies on Spire’s parental guaranties to secure its purchase and sales obligations of natural gas, and it also has access to Spire’s liquidity resources. A large portion of Spire Marketing’s receivables are from customers in the energy industry. It also enters into netting arrangements with many of its energy counterparties to reduce overall credit and collateral exposure. On a net dollar exposure basis, the majority of Spire Marketing’s customers are utilities or utility affiliates. Although Spire Marketing’s uncollectible amounts are closely monitored and have not been significant, increases in uncollectible amounts from customers are possible and could adversely affect Spire Marketing’s liquidity and results of operations.

Spire Marketing carefully monitors the creditworthiness of counterparties to its transactions. It performs in-house credit reviews of potential customers and may require credit assurances such as prepayments, letters of credit or parental guaranties when appropriate. Credit limits for customers are established and monitored.

Spire Marketing cannot be certain that all of its wholesale purchase and sale transactions will settle physically. As such, these transactions are designated as trading activities for financial reporting purposes, due to their settlement characteristics. Results of operations from trading activities are reported on a net basis in natural gas expenses.

In the course of its business, Spire Marketing enters into commitments associated with the purchase or sale of natural gas. In accordance with U.S. GAAP, some of its purchase and sale transactions are not recognized in earnings until the natural gas is physically delivered, while other energy-related transactions, including those designated as trading activities, are required to be accounted for as derivatives with the changes in their fair value (representing unrealized gains or losses) recorded in earnings in periods prior to settlement. Because related transactions of a purchase and sale strategy may be accounted for differently, there may be timing differences in the recognition of earnings under GAAP and economic earnings realized upon settlement. The Company reports both GAAP and net economic earnings (non-GAAP), as discussed in the section “Non-GAAP Measures”.

Midstream

In its Midstream segment, Spire seeks to drive growth through supporting natural gas grid reliability, the ability to manage exposure to gas price volatility, and providing access to key supply basins for the shipment of natural gas. These transportation and storage operations serve a variety of natural gas customers, including Spire’s other businesses.

Absolute natural gas prices do not directly impact the results of this segment, but there is a relationship between natural gas prices and the revenues derived from the transportation and storage of natural gas. Natural gas price trends and demand for natural gas influence these price relationships through market volatility or changes in absolute prices of one supply/market point to another. Further, natural gas price differences between the various hubs Spire serves could influence the volumes of gas transported or stored on Spire’s system and the related transportation and storage rates.

Spire carefully monitors the creditworthiness of counterparties to its transactions. It performs in-house credit reviews of potential customers and may require credit assurances such as prepayments, letters of credit or parental guaranties when appropriate. Credit limits for customers are established and monitored.

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NON-GAAP MEASURES

Net income, earnings per share and operating income reported by Spire, Spire Missouri and Spire Alabama are determined in accordance with GAAP. Spire, Spire Missouri and Spire Alabama also provide the non-GAAP financial measures of net economic earnings, net economic earnings per share and contribution margin. Management and the Board of Directors use non-GAAP financial measures, in addition to GAAP financial measures, to understand and compare operating results across accounting periods, for financial and operational decision making, for planning and forecasting, to determine incentive compensation and to evaluate financial performance. These non-GAAP operating metrics should not be considered as alternatives to, or more meaningful than, the related GAAP measures. Reconciliations of non-GAAP financial measures to the most directly comparable GAAP measures are provided on the following pages.

Net Economic Earnings and Net Economic Earnings Per Share

Net economic earnings and net economic earnings per share are non-GAAP measures that exclude from net income, as applicable, the impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of impairments and other non-recurring or unusual items such as certain regulatory, legislative or GAAP standard-setting actions. In addition, net economic earnings per share would exclude the impact, in the fiscal year of issuance, of any shares issued to finance acquisitions that have yet to be included in net economic earnings.

The fair value and timing adjustments are made in instances where the accounting treatment differs from what management considers the economic substance of the underlying transaction, including the following:

•  Net unrealized gains and losses on energy-related derivatives that are required by GAAP fair value accounting associated with current changes in the fair value of financial and physical transactions prior to their completion and settlement. These unrealized gains and losses result primarily from two sources:

1)	changes in the fair values of physical and/or financial derivatives prior to the period of settlement; and
2)	ineffective portions of accounting hedges, required to be recorded in earnings prior to settlement, due to differences in commodity price changes between the locations of the forecasted physical purchase or sale transactions and the locations of the underlying hedge instruments;

•  Lower of cost or market adjustments to the carrying value of commodity inventories resulting when the net realizable value of the commodity falls below its original cost, to the extent that those commodities are economically hedged; and

•  Realized gains and losses resulting from the settlement of economic hedges prior to the sale of the physical commodity.

These adjustments eliminate the impact of timing differences and the impact of current changes in the fair value of financial and physical transactions prior to their completion and settlement. Unrealized gains or losses are recorded in each period until being replaced with the actual gains or losses realized when the associated physical transactions occur. Management believes that excluding the earnings volatility caused by recognizing changes in fair value prior to settlement and other timing differences associated with related purchase and sale transactions provides a useful representation of the economic effects of only the actual settled transactions and their effects on results of operations. While management uses these non-GAAP measures to evaluate all of its businesses, the net effect of these fair value and timing adjustments on the Utilities’ earnings is minimal because gains or losses on their natural gas derivative instruments are deferred pursuant to state regulation.

Contribution Margin

In addition to operating revenues and operating expenses, management also uses the non-GAAP measure of contribution margin when evaluating results of operations. Contribution margin is defined as operating revenues less natural gas costs and gross receipts tax expense. The Utilities pass to their customers (subject to prudence review by, as applicable, the MoPSC, APSC or MSPSC) increases and decreases in the wholesale cost of natural gas in accordance with their PGA clauses or GSA riders. The volatility of the wholesale natural gas market results in fluctuations from period to period in the recorded levels of, among other items, revenues and natural gas cost expense. Nevertheless, increases and decreases in the cost of gas associated with system gas sales volumes and gross receipts tax expense (which are calculated as a percentage of revenues), with the same amount (excluding immaterial timing differences) included in revenues, have no direct effect on operating income. Therefore, management believes that contribution margin is a useful supplemental measure, along with the remaining operating expenses, for assessing the Company’s and the Utilities’ performance.

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EARNINGS

This section contains discussion and analysis of the results for the year ended September 30, 2023 compared to the results for the year ended September 30, 2022. The discussion and analysis of the results for the year ended September 30, 2022 compared to the results of the year ended September 30, 2021 can be found in Part II, Item 7 of Spire Inc.’s fiscal 2022 Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (SEC) on November 16, 2022.

The following sections present and discuss the financial metrics in total and by registrant and segment.

Spire

The following tables reconcile the Company’s net economic earnings to the most comparable GAAP number, net income.

																Per
	Gas			Gas									Consol-			Diluted
	Utility			Marketing			Midstream			Other			idated			Share**
Year Ended September 30, 2023
Net Income (Loss) [GAAP]	$	200.5		$	39.1		$	12.0		$	(34.1	)	$	217.5		$	3.85
Adjustments, pre-tax:
Fair value and timing adjustments		—			11.4			—			—			11.4			0.21
Acquisition activities		—			—			2.5			—			2.5			0.05
Income tax effect of adjustments*		—			(2.9	)		(0.4	)		—			(3.3	)		(0.06	)
Net Economic Earnings (Loss) [Non-GAAP]	$	200.5		$	47.6		$	14.1		$	(34.1	)	$	228.1		$	4.05
Year Ended September 30, 2022
Net Income (Loss) [GAAP]	$	198.6		$	35.6		$	11.1		$	(24.5	)	$	220.8		$	3.95
Adjustments, pre-tax:
Fair value and timing adjustments		—			(11.4	)		—			—			(11.4	)		(0.22	)
Income tax effect of adjustments*		4.1			2.8			—			—			6.9			0.13
Net Economic Earnings (Loss) [Non-GAAP]	$	202.7		$	27.0		$	11.1		$	(24.5	)	$	216.3		$	3.86
Year Ended September 30, 2021
Net Income (Loss) [GAAP]	$	237.2		$	44.8		$	11.1		$	(21.4	)	$	271.7		$	4.96
Adjustments, pre-tax:
Missouri regulatory adjustments		(9.0	)		—			—			—			(9.0	)		(0.17	)
Fair value and timing adjustments		0.3			3.0			—			—			3.3			0.06
Divestiture activities		—			—			—			(1.3	)		(1.3	)		(0.02	)
Income tax effect of adjustments*		2.1			(0.8	)		—			0.3			1.6			0.03
Net Economic Earnings (Loss) [Non-GAAP]	$	230.6		$	47.0		$	11.1		$	(22.4	)	$	266.3		$	4.86

* Income tax effect is calculated by applying federal, state and local income tax rates applicable to ordinary income to the amounts of the pre-tax reconciling items and then adding any estimated effects of enacted state or local income tax laws for periods before the related effective date and, in the case of fiscal 2022, includes the $4.1 Spire Missouri regulatory adjustment discussed below.

** Net economic earnings per share is calculated by replacing consolidated net income with consolidated net economic earnings in the GAAP diluted earnings per share calculation, which includes reductions for cumulative preferred dividends and participating shares.

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Reconciliations of contribution margin to the most directly comparable GAAP measure are shown below.

	Gas			Gas
	Utility			Marketing			Midstream		Other			Eliminations			Consolidated
Year Ended September 30, 2023
Operating Income (Loss)	$	350.8		$	49.3		$	24.3	$	(5.8	)	$	—		$	418.6
Operation and maintenance expenses		461.8			19.4			30.5		21.9			(16.0	)		517.6
Depreciation and amortization		244.4			1.5			8.4		0.5			—			254.8
Taxes, other than income taxes		210.3			1.2			2.9		0.1			—			214.5
Less: Gross receipts tax expense		(131.5	)		(0.3	)		—		—			—			(131.8	)
Contribution Margin [Non-GAAP]		1,135.8			71.1			66.1		16.7			(16.0	)		1,273.7
Natural gas costs		1,189.6			107.7			—		—			(36.5	)		1,260.8
Gross receipts tax expense		131.5			0.3			—		—			—			131.8
Operating Revenues	$	2,456.9		$	179.1		$	66.1	$	16.7		$	(52.5	)	$	2,666.3

	Gas			Gas
	Utility			Marketing			Midstream		Other		Eliminations			Consolidated
Year Ended September 30, 2022
Operating Income	$	339.9		$	46.9		$	20.8	$	0.6	$	—		$	408.2
Operation and maintenance expenses		413.3			14.6			22.2		14.9		(15.4	)		449.6
Depreciation and amortization		227.9			1.4			7.5		0.5		—			237.3
Taxes, other than income taxes		176.2			0.6			2.6		0.1		—			179.5
Less: Gross receipts tax expense		(109.6	)		(0.2	)		—		—		—			(109.8	)
Contribution Margin [Non-GAAP]		1,047.7			63.3			53.1		16.1		(15.4	)		1,164.8
Natural gas costs		788.8			171.4			—		—		(36.3	)		923.9
Gross receipts tax expense		109.6			0.2			—		—		—			109.8
Operating Revenues	$	1,946.1		$	234.9		$	53.1	$	16.1	$	(51.7	)	$	2,198.5

	Gas			Gas
	Utility			Marketing			Midstream		Other			Eliminations			Consolidated
Year Ended September 30, 2021
Operating Income (Loss)	$	374.0		$	58.5		$	19.5	$	(1.8	)	$	—		$	450.2
Operation and maintenance expenses		422.2			17.1			24.2		16.0			(13.7	)		465.8
Depreciation and amortization		204.4			1.2			6.9		0.6			—			213.1
Taxes, other than income taxes		157.0			0.9			2.0		0.2			—			160.1
Less: Gross receipts tax expense		(93.9	)		(0.1	)		—		—			—			(94.0	)
Contribution Margin [Non-GAAP]		1,063.7			77.6			52.6		15.0			(13.7	)		1,195.2
Natural gas costs		961.7			18.8			—		0.1			(34.3	)		946.3
Gross receipts tax expense		93.9			0.1			—		—			—			94.0
Operating Revenues	$	2,119.3		$	96.5		$	52.6	$	15.1		$	(48.0	)	$	2,235.5

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Select changes from the year ended September 30, 2022 to the year ended September 30, 2023 are summarized in the following table and discussed below.

	Gas			Gas					Other, Net of
Changes FY23 from FY22	Utility			Marketing			Midstream		Eliminations			Consolidated
Net Income	$	1.9		$	3.5		$	0.9	$	(9.6	)	$	(3.3	)
Net Economic Earnings [Non-GAAP]		(2.2	)		20.6			3.0		(9.6	)		11.8
Operating Revenues		510.8			(55.8	)		13.0		(0.2	)		467.8
Contribution Margin [Non-GAAP]		88.1			7.8			13.0		(0.0	)		108.9
Operation and Maintenance Expenses		48.5			4.8			8.3		6.4			68.0
Other Income (Expense)													32.1
Interest Expense													65.9
Income Tax													(20.1	)

The increase in interest expense reflects the significant increase in short-term interest rates and higher long-term debt levels versus the prior year, combined with higher average levels of short-term borrowings in the current year. Weighted-average short-term interest rates were 5.0% in the current year, versus 1.1% in the prior year.

The change in other income was $22.6 after removing the impact of the Postretirement Non-Service Cost Transfer (NSC Transfer) of $9.5. This increase was driven primarily by Spire Missouri, the result of increased inventory carrying-cost credits combined with favorable mark-to-market valuations on non-qualified retirement trusts. The year-over-year growth also benefited from investment gains experienced by other subsidiaries.

Income tax expense decreased $20.1. The current year benefited from lower pre-tax income and a one-time tax credit study, while the prior year included $4.1 expense related to the 2021 Missouri rate order.

Gas Utility

For the twelve months ended September 30, 2023, Gas Utility net income was $1.9 higher than the prior-year period, as the $2.6 and $1.8 growth at Spire Missouri and Spire EnergySouth, respectively, was partly offset by the $2.5 decrease at Spire Alabama. Net economic earnings in the current year was $2.2 lower than the prior year, which tracks net income after removing the Spire Missouri $4.1 GAAP regulatory tax adjustment in the prior-year period. These results are described in further detail below.

The increase in Gas Utility operating revenues for fiscal 2023 was attributable to the following factors: 

Spire Missouri and Spire Alabama – Higher PGA/GSA gas cost recoveries	$	436.1
Spire Missouri – 2021 and 2022 rate case outcomes		60.7
Spire Alabama – RSE: net adjustments		22.0
Spire Missouri and Spire Alabama – Higher gross receipts taxes		21.5
Spire EnergySouth		6.9
Spire Missouri – Volumetric usage including weather mitigation impact		4.1
Spire Alabama – Volumetric usage including weather mitigation impact		(30.6	)
Spire Missouri and Spire Alabama – Lower off-system sales		(12.3	)
All other factors		2.4
Total Variation	$	510.8

The primary driver of revenue growth in the current year was $436.1 in higher gas cost recoveries at the utilities of Spire Missouri and Spire Alabama, reflecting higher average gas costs being passed through to customers. The current year also benefited from a $60.7 increase at Spire Missouri resulting from the current-year impacts of the 2022 and 2021 rate orders. The current year results also include $22.0 in net favorable rate adjustments under the RSE mechanism at Spire Alabama, higher gross receipts taxes of $21.5 at Spire Missouri and Spire Alabama, growth of $6.9 at Spire EnergySouth, and favorable volume/usage of $4.1 at Spire Missouri. These benefits were only partly offset by a $30.6 reduction due to volume/usage at Spire Alabama, and a combined $12.3 reduction in off-system sales between Spire Missouri and Spire Alabama.

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The year-over-year increase in Gas Utility contribution margin was attributable to the following factors:

Spire Missouri – 2021 and 2022 rate case outcomes	$	60.7
Spire Alabama – RSE: net adjustments		19.6
Spire Missouri - Volumetric usage including weather mitigation impact		5.4
Spire EnergySouth		3.3
Spire Alabama – Volumetric usage including weather mitigation impact		(2.2	)
All other factors		1.3
Total Variation	$	88.1

The contribution margin growth was primarily driven by the $60.7 increase from the Spire Missouri 2022 and 2021 rate order implementations, $19.6 from favorable rate adjustments within the RSE framework at Spire Alabama, and a $3.3 increase at Spire EnergySouth. The $5.4 favorable volume impact at Spire Missouri was partly offset by the $2.2 volume decline at Spire Alabama, both net of weather mitigation impacts.

O&M expenses for the twelve months ended September 30, 2023, were $48.5 higher than the prior year. Expenses increased $15.4 after removing the $9.1 impact of the NSC Transfer and approximately $24 due to the change in treatment of Spire Missouri general overheads that were being deferred in the prior-year period. The O&M increase was driven by a $22.1 increase in operations and customer experience costs and a $5.0 increase in bad debt expense. These increases were only partly offset by a $5.3 reduction in outside services, favorable administrative and general (A&G) expenses, and lower employee-related expenses.

Taxes, other than income taxes, increased $34.1, and were driven by $21.9 in higher pass-through gross receipts taxes, along with higher property taxes resulting from the continued infrastructure build-out by the Utilities. Depreciation and amortization expenses for fiscal 2023 were $16.5 higher than the same period in the prior year primarily driven by continued infrastructure capital expenditures across all the Utilities.

Gas Marketing

Net income growth of $3.5 reflects the strong operating results experienced in the current-year, driven by favorable market conditions in the first half of fiscal 2023 that allowed the business to take advantage of regional basis differentials to optimize storage and transportation positions. These gains were partly offset by unfavorable year-over-year after-tax unrealized fair market value adjustments of $17.1, and slightly higher O&M costs associated with higher employee-related expenses. Net economic earnings exceeds net income growth as net economic earnings excludes the impacts of the unrealized fair market value adjustments.

The decline in operating revenues primarily reflects lower commodity pricing in fiscal 2023 versus the prior year.

Gas Marketing contribution margin increased $7.8 from the same period last year, driven by incremental optimization of storage and transportation assets in the current year, which were only partly offset by unfavorable year-over-year fair value adjustments of $22.8. 

Midstream

Net income and net economic earnings for the Company’s Midstream segment increased $0.9 and $3.0, respectively, for the year ended September 30, 2023 versus the prior-year period. Strong net income performance at Spire Storage West reflecting optimized operational and withdrawal commitments that were partly offset by the acquisition of Spire Storage Salt Plains, whose impacts are excluded from net economic earnings. 

The $13.0 increase in operating revenues and contribution margin is attributable to the $8.1 growth at Spire Storage West and to the Spire Storage Salt Plains acquisition in April 2023. The O&M increase of $8.3 is driven by a $2.1 increase at Spire Storage West supporting the higher level of billable storage activity, with the remaining increase due principally to Spire Storage Salt Plains operations as well as acquisition and transaction costs for the previously announced and pending Missouri Gas Company (MoGas) acquisition.

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Other

The Company’s other activities incurred a $34.1 loss for the twelve months ended September 30, 2023, $9.6 higher than the prior-year period. The larger current-year loss was driven by higher interest expense, reflecting both higher borrowings and interest rates, combined with higher corporate costs, partly offset by lower income tax expense.

Spire Missouri

	Year Ended September 30,
	2023			2022
Operating Income	$	207.1		$	204.0
Operation and maintenance expenses		296.2			255.7
Depreciation and amortization		158.7			145.3
Taxes, other than income taxes		157.5			129.0
Less: Gross receipts tax expense		(96.7	)		(79.6	)
Contribution Margin [Non-GAAP]		722.8			654.4
Natural gas costs		943.4			587.0
Gross receipts tax expense		96.7			79.6
Operating Revenues	$	1,762.9		$	1,321.0
Net Income	$	117.5		$	114.9

Operating revenues for the twelve months ended September 30, 2023 were $441.9 higher than the comparable prior-year period. A key driver was an increase in gas recovery costs totaling $362.3. Further, $60.7 of the increase attributable to fiscal 2023 results represent the cumulative impacts of the implementation of the 2022 and 2021 rate orders. Higher gross receipts taxes contributed a $17.1 increase, and volume (net of weather mitigation) contributed $4.1 growth. These revenue growth drivers were only partially offset by lower off-system sales of $5.2.

Temperatures in Spire Missouri’s service areas during fiscal 2023 were 1.4% warmer than during fiscal 2022 and 10.4% warmer than normal. The Spire Missouri total system volume sold and transported was 1,592.0 million centum of cubic feet (CCF) for the year ended September 30, 2023, compared with 1,602.8 million CCF last year. Total off-system volume sold and transported was 14.5 million CCF for fiscal 2023, compared with 19.1 million for fiscal 2022. 

Contribution margin for the fiscal year ended September 30, 2023 increased $68.4 from the same period in the prior year. The increase was the result of the previously mentioned timing of the 2022 and 2021 rate case implementations generating $60.7 incremental contribution margin, combined with favorable volumetric impacts of $5.4.

Reported O&M expenses for the current year period increased $40.5 versus the prior year. Expenses increased $8.6 after removing the $7.9 impact of the NSC Transfer and the approximately $24 of general overheads that were deferred in the prior year. The increase reflects higher non-employee operations expense of $14.7 and higher bad debt expense of $2.2, partly offset by lower outside service costs and favorable A&G expenses in the current year. 

Depreciation and amortization expenses were up $13.4, the result of continued investment in infrastructure upgrades. Other income was higher by $18.4, after removing the $7.9 due to the NSC Transfer. This variance is primarily attributable to increased natural gas inventory carrying cost credits, combined with favorable mark-to-market valuations on non-qualified retirement trusts. Interest expense increased $36.5, primarily reflecting higher short-term interest rates and net long-term debt issuances in the current year.

Net income increased $2.6 over the comparable prior-year period.

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Spire Alabama

	Year Ended September 30,
	2023			2022
Operating Income	$	119.7		$	112.6
Operation and maintenance expenses		136.4			130.1
Depreciation and amortization		69.3			66.8
Taxes, other than income taxes		43.0			38.1
Less: Gross receipts tax expense		(29.9	)		(25.5	)
Contribution Margin [Non-GAAP]		338.5			322.1
Natural gas costs		202.7			161.5
Gross receipts tax expense		29.9			25.5
Operating Revenues	$	571.1		$	509.1
Net Income	$	66.0		$	68.5

The $62.0 increase in operating revenues reflects a $73.8 increase in gas cost recoveries pursuant to the GSA mechanism, $22.0 higher net rate adjustments under the RSE mechanism, and higher gross receipts taxes of $4.4. These favorable impacts were partly offset by a $30.6 reduction attributable to weather/volumetric impacts, and a $7.1 decrease in off-system sales. 

Temperatures in Spire Alabama’s service area during fiscal 2023 were 10.7% warmer than during fiscal 2022 and 18.8% warmer than normal. Spire Alabama’s total system volume sold and transported was 1,026.2 million CCF during the year ended September 30, 2023, compared with 1,010.8 million CCF during the prior year. Off-system sales volume for fiscal 2023 totaled 98.8 million CCF compared with 63.1 million CCF for fiscal 2022.

Contribution margin increased $16.4, which was principally a result of net favorable RSE adjustments of $19.6. This growth was tempered by unfavorable weather/volumetric impacts totaling $2.2, after applying weather mitigation. 

Excluding the impact of the NSC Transfer of $1.1, the increase in O&M of $5.2 was largely due to a $2.3 increase in bad debt expense. Depreciation expense was up $2.5 reflecting the continued infrastructure investments in the service territory. 

The variance in other income is primarily the impact of the year-over-year change in the NSC Transfer. Interest expense increased $13.6, primarily reflecting higher short-term interest rates and long-term debt issuances in the current year. Resulting fiscal 2023 net income declined $2.5 versus fiscal 2022.

LIQUIDITY AND CAPITAL RESOURCES

Recent Cash Flows

	2023			2022			2021
Net cash provided by operating activities	$	440.2		$	55.0		$	249.8
Net cash used in investing activities		(695.5	)		(546.7	)		(622.0	)
Net cash provided by financing activities		260.6			500.9			379.4

Net cash provided by operating activities increased $385.2 from 2022 to 2023 after decreasing $194.8 from 2021 to 2022. In addition to the changes in net income between the respective periods (discussed above), the remaining changes were related to regulatory timing and fluctuations in working capital items, as discussed below in the Future Cash Requirements section. Specifically, the timing and amounts of regulatory adjustments for purchased gas costs resulted in a large change in deferred recovery in 2022, greatly reducing net cash provided by operating activities that year. 

35

In 2023, the Company's net cash used in investing activities was $148.8 more than in 2022, primarily driven by a $110.3 increase in capital expenditures and the $37.0 acquisition of Spire Storage Salt Plains. Capital expenditures increased $60.0 in the Gas Utility segment (primarily due to meter and other infrastructure upgrades) and $51.0 in the Midstream segment (primarily due to the ongoing Wyoming storage facility expansion).

In 2022, the Company used $75.3 less cash in investing activities than in 2021, primarily driven by a $72.6 decrease in capital expenditures, with Gas Utility down $61.8 and Midstream down $10.4.

Net cash provided by financing activities was down $240.3 in 2023 compared to 2022 as a result of lower net debt issuances, lower common stock issuances, and higher dividends. Although the net increase in long-term debt was $473.8 in fiscal 2023 compared to only $244.2 in fiscal 2022, Spire reduced short-term debt by $82.0 in fiscal 2023 after increasing short-term borrowings $365.5 in 2022. 

Net cash provided by financing activities was up $121.5 in 2022 compared to 2021. As noted above, 2022 net short-term debt issuances were $365.5, which was $341.5 higher than in 2021. In addition, the combination of lower net repayments of long-term debt ($59.6) and higher cash generated from the issuance of common stock ($50.9) in 2022 contributed $110.5 to the year-over-year increase. A significant offset to these increases was a $329.1 decline in cash generated from the issuance of long-term debt, coupled with $8.7 higher common stock dividend payments.

Future Cash Requirements

The Company’s short-term borrowing requirements typically peak during colder months when the Utilities borrow money to cover the lag between when they purchase natural gas and when their customers pay for that gas. Changes in the wholesale cost of natural gas (including cash payments for margin deposits associated with Spire Missouri’s use of natural gas derivative instruments), variations in the timing of collections of gas cost under the Utilities’ PGA clauses and GSA riders, the seasonality of accounts receivable balances, and the utilization of stored gas inventories cause short-term cash requirements to vary during the year and from year to year, and may cause significant variations in the Company’s cash provided by or used in operating activities.

Spire’s material cash requirements as of September 30, 2023, are related to capital expenditures, principal and interest payments on long-term debt, natural gas purchase obligations, and common and preferred stock dividends.

Total Company capital expenditures are planned to be $765 for fiscal 2024, though Spire had purchase commitments for less than a quarter of these as of September 30, 2023.

As detailed in Note 6, Long-Term Debt, of the Notes to Financial Statements in Item 8, $156.6 of the total $3,732.7 principal amount is due in fiscal 2024. Using each long-term debt instrument’s stated maturity and fixed rates or variable rates as of September 30, 2023, interest payments are projected to total $1,817.3, of which $150.7 is due in fiscal 2024.

Spire’s natural gas purchase obligations totaled $1,613.2, including $650.1 for fiscal 2024, representing the minimum payments required under existing natural gas transportation and storage contracts and natural gas supply agreements. The amounts reflect fixed obligations as well as obligations to purchase natural gas at future market prices, calculated using forward market prices as of September 30, 2023. Each of the Utilities generally recovers costs related to its purchases, transportation and storage of natural gas through the operation of its PGA clause or GSA rider, subject to prudence review by the appropriate regional public service commission. Additional contractual commitments are generally entered into prior to or during the heating season.

Spire dividends declared and payable as of September 30, 2023, totaled $43.1, while annualized dividends based on the regular quarterly amounts declared on November 10, 2023, are estimated at $175.3.

Spire will pay $175 cash, subject to customary working capital and other closing adjustments, to acquire MoGas Pipeline, an interstate natural gas pipeline, and Omega Pipeline, a connected gas distribution system, from CorEnergy Infrastructure Trust, Inc. if the transaction closes (currently anticipated in the second quarter of fiscal 2024). For further discussion of this pending acquisition, see Note 16, Commitments and Contingencies, of the Notes to Financial Statements in Item 8.

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Source of Funds

It is management’s view that the Company, Spire Missouri and Spire Alabama have adequate access to capital markets and will have sufficient capital resources, both internal and external, to meet anticipated requirements.

The Company’s, Spire Missouri’s and Spire Alabama’s access to capital markets, including the commercial paper market, and their respective financing costs, may depend on the credit rating of the entity that is accessing the capital markets. Their debt is rated by two rating agencies: Standard & Poor’s Corporation (“S&P”) and Moody’s Investors Service (“Moody’s”). As of September 30, 2023, the debt ratings of the Company, Spire Missouri and Spire Alabama (shown in the following table) remain at investment grade with a stable outlook (other than Moody's negative outlook for Spire Alabama debt).

	S&P	Moody’s
Spire Inc. senior unsecured long-term debt	BBB+	Baa2
Spire Inc. preferred stock	BBB	Ba1
Spire Inc. short-term debt	A-2	P-2
Spire Missouri senior secured long-term debt	A	A1
Spire Alabama senior unsecured long-term debt	A-	A2

Cash and Cash Equivalents

Bank deposits were used to support working capital needs of the business. Spire had no temporary cash investments as of September 30, 2023 or 2022.

Short-term Debt

The Company’s short-term cash requirements can be met through the sale of commercial paper or the use of a revolving credit facility. For information about these resources, see Note 7, Notes Payable and Credit Agreements, of the Notes to Financial Statements in Item 8 and “Interest Rate Risk” under “Market Risk” below.

Long-term Debt and Equity

At September 30, 2023, Spire had outstanding principal of long-term debt totaling $3,732.7, of which $1,798.0 was issued by Spire Missouri, $750.0 was issued by Spire Alabama, and $229.7 was issued by other subsidiaries. For more information about long-term debt, see Note 6 of the Notes to Financial Statements in Item 8 and “Interest Rate Risk” under “Market Risk” below.

Effective March 5, 2022, Spire Missouri was authorized by the MoPSC to issue conventional term loans, first mortgage bonds, unsecured debt, preferred stock and common stock in an aggregate amount of up to $800.0 for financings placed any time before December 31, 2024. Under this authorization through September 30, 2023, Spire Missouri has issued $79.1 of common stock and $400.0 of first mortgage bonds. Spire Alabama has no standing authority to issue long-term debt and must petition the APSC for each planned issuance.

On October 13, 2022, Spire Alabama issued $90.0 of notes due October 15, 2029, bearing interest at 5.32% and $85.0 of notes due October 15, 2032, bearing interest at 5.41%. Interest is payable semi-annually. The notes are senior unsecured obligations and rank equal in right to payment with all other senior unsecured indebtedness of Spire Alabama. Also on October 13, 2022, Spire Gulf issued $30.0 of first mortgage bonds due October 15, 2037, bearing interest at 5.61% payable semi-annually. The bonds rank equal in right to payment with the other first mortgage bonds issued by Spire Gulf. The bonds were issued under a supplemental indenture with collateral fall away provisions whereby, under certain conditions, Spire Gulf may elect to exchange the bonds, which are secured, for unsecured notes.

On February 13, 2023, Spire Missouri issued $400.0 aggregate principal amount of its 4.80% Series First Mortgage Bonds due 2033. Interest is payable semi-annually. The notes are senior secured indebtedness of Spire Missouri and rank equally with all other existing and future senior secured indebtedness issued by Spire Missouri under its mortgage and deed of trust. The bonds are secured by a first mortgage lien on substantially all of the real properties of Spire Missouri, subject to limited exceptions.

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On March 7, 2023, Spire issued $150.0 aggregate principal amount of its 5.80% Series 2023 Senior Notes due March 15, 2033. Interest is payable semi-annually. The notes are senior unsecured obligations of the Company.

Spire has a shelf registration statement on Form S-3 on file with the SEC for the issuance and sale of up to 250,000 shares of common stock under its Dividend Reinvestment and Direct Stock Purchase Plan. There were 244,182 and 237,891 shares at September 30, 2023 and November 10, 2023, respectively, remaining available for issuance under this Form S-3. Spire and Spire Missouri also have a universal shelf registration statement on Form S-3 on file with the SEC for the issuance of various equity and debt securities, which expires on May 9, 2025.

Spire has an “at-the-market” (ATM) equity distribution agreement, pursuant to which the Company may offer and sell, from time to time, shares of its common stock (including shares of common stock that may be sold pursuant to forward sale agreements entered into in connection with the ATM equity distribution agreement). In the second and third quarters of fiscal 2023, Spire executed forward sale agreements for a total of 2,315,921 shares, 1,744,549 of which must be settled on or before December 28, 2023 and 571,372 of which were settled on September 27, 2023, generating net proceeds of $38.5. Had the remaining shares under the forward agreements been settled as of September 30, 2023, it would have generated net proceeds of $111.2. As of September 30, 2023, Spire may sell additional shares with an aggregate offering price of up to $17.9 under the current Board of Directors authorization expiring May 2025. For additional information about the ATM program, see Note 5 of the Notes to Financial Statements in Item 8.

In February 2021, Spire issued 3.5 million equity units for an aggregate stated amount of $175.0, resulting in net proceeds of $169.3 after underwriting fees and other issuance costs. See Note 5, Shareholders’ Equity, of the Notes to Financial Statements in Item 8 for additional discussion of these equity units.

Including the current portion of long-term debt, the Company’s long-term consolidated capitalization consisted of 44% equity at September 30, 2023 and 46% equity at September 30, 2022. For more information about equity, see Note 5 of the Notes to Financial Statements in Item 8.

ENVIRONMENTAL MATTERS

The Utilities and other Spire subsidiaries own and operate natural gas distribution, transmission and storage facilities, the operations of which are subject to various environmental laws, regulations and interpretations. While environmental issues resulting from such operations arise in the ordinary course of business, such issues have not materially affected the Company’s, Spire Missouri’s or Spire Alabama’s financial position and results of operations. As environmental laws, regulations and their interpretations change, however, the Company and the Utilities may be required to incur additional costs. For information relative to environmental matters, see Contingencies in Note 16 of the Notes to Financial Statements in Item 8.

REGULATORY MATTERS

For discussions of regulatory matters for Spire, Spire Missouri, and Spire Alabama, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

ACCOUNTING PRONOUNCEMENTS

The Company, Spire Missouri and Spire Alabama have evaluated recently issued accounting standards and concluded that none will have a material impact on their financial position or results of operations upon adoption.

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CRITICAL ACCOUNTING ESTIMATES

Our discussion and analysis of our financial condition, results of operations, liquidity and capital resources are based upon our financial statements, which have been prepared in accordance with GAAP, which requires that we make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on an ongoing basis. We base our estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. We believe the following represent the more significant items requiring the use of judgment and estimates in preparing our financial statements:

Regulatory Accounting – The Utilities account for their regulated operations in accordance with FASB Accounting Standards Codification Topic 980, Regulated Operations. The provisions of this accounting guidance require, among other things, that financial statements of a rate-regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-rate-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. Also, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities). Management believes that the current regulatory environment supports the continued use of these regulatory accounting principles and that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process. For Spire Missouri and Spire Alabama, management believes the following represent the more significant items recorded through the application of this accounting guidance:

PGA Clause – Spire Missouri’s PGA clauses allows it to flow through to customers, subject to a prudence review by the MoPSC, the cost of purchased gas supplies, including the costs, cost reductions and related carrying costs associated with the use of natural gas derivative instruments to hedge the purchase price of natural gas. The difference between actual costs incurred and costs recovered through the application of the PGA clauses are recorded as regulatory assets and regulatory liabilities that are recovered or refunded in a subsequent period. The PGA clauses also permit the application of carrying costs to all over- or under-recoveries of gas costs, including costs and cost reductions associated with the use of derivative instruments, and also provide for a portion of income from off-system sales and capacity release revenues to be flowed through to customers.

GSA Rider – Spire Alabama’s rate schedules for natural gas distribution charges contain a GSA rider, established in 1993, which permits the pass-through to customers of changes in the cost of gas supply. Spire Alabama’s tariff provides a temperature adjustment mechanism, also included in the GSA, that is designed to moderate the impact of departures from normal temperatures on Spire Alabama’s earnings. The temperature adjustment applies primarily to residential, small commercial and small industrial customers. Other non-temperature weather related conditions that may affect customer usage are not included in the temperature adjustment. In prior years, Spire Alabama entered into cash flow derivative commodity instruments to hedge its exposure to price fluctuations on its gas supply. Spire Alabama recognizes all derivatives at fair value as either assets or liabilities on the balance sheet. Any realized gains or losses are passed through to customers using the mechanisms of the GSA rider in accordance with Spire Alabama’s APSC approved tariff and are recognized as a regulatory asset or regulatory liability. All derivative commodity instruments in a gain position are valued on a discounted basis incorporating an estimate of performance risk specific to each related counterparty. Derivative commodity instruments in a loss position are valued on a discounted basis incorporating an estimate of performance risk specific to Spire Alabama. Spire Alabama currently has no active gas supply derivative positions.

ISRS – The ISRS allows Spire Missouri expedited recovery for its investment to upgrade its infrastructure and enhance its safety and reliability without the necessity of a formal rate case. Spire Missouri records ISRS revenues as authorized by the MoPSC and estimates the probability and amount of any refunds based on commission precedent, current legal rulings, the opinion of legal counsel, and other considerations.

For more information, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

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Employee Benefits and Postretirement Obligations – Pension and postretirement obligations are calculated by actuarial consultants that utilize several statistical factors and other assumptions provided by management related to future events, such as discount rates, returns on plan assets, compensation increases, and mortality rates. For the Utilities, the amount of expense recognized and the amounts reflected in other comprehensive income are dependent upon the regulatory treatment provided for such costs, as discussed further below. Certain liabilities related to group medical benefits and workers’ compensation claims, portions of which are self-insured and/or contain “stop-loss” coverage with third-party insurers to limit exposure, are established based on historical trends.

The amount of net periodic pension and other postretirement benefit costs recognized in the financial statements related to the Utilities’ qualified pension plans and other postretirement benefit plans is based upon allowances, as approved by the MoPSC (for Spire Missouri) and as approved by the APSC (for Spire Alabama). The allowances have been established in the rate-making process for the recovery of these costs from customers. The differences between these amounts and actual pension and other postretirement benefit costs incurred for financial reporting purposes are deferred as regulatory assets or regulatory liabilities. GAAP also requires that changes that affect the funded status of pension and other postretirement benefit plans, but that are not yet required to be recognized as components of pension and other postretirement benefit costs, be reflected in other comprehensive income. For the Utilities’ qualified pension plans and other postretirement benefit plans, amounts that would otherwise be reflected in other comprehensive income are deferred with entries to regulatory assets or regulatory liabilities.

For more information, see Note 13, Pension Plans and Other Postretirement Benefits, of the Notes to Financial Statements in Item 8.

The tables below reflect the sensitivity of Spire’s plans to potential changes in key assumptions:

Pension Plan Benefits:				Estimated Increase/
				(Decrease) to			Estimated Increase/
	Increase/			Projected			(Decrease) to Annual
Actuarial Assumptions	(Decrease)			Benefit Obligation			Net Pension Cost*
Discount Rate		0.25	%	$	(9.3	)	$	0.1
		(0.25	)%		9.7			(0.1	)
Expected Return on Plan Assets		0.25	%		—			(1.0	)
		(0.25	)%		—			1.0
Rate of Future Compensation Increase		0.25	%		0.6			0.1
		(0.25	)%		(0.6	)		(0.1	)

Postretirement Benefits:				Estimated Increase/
				(Decrease) to			Estimated Increase/
				Projected			(Decrease) to Annual
	Increase/			Postretirement			Net Postretirement
Actuarial Assumptions	(Decrease)			Benefit Obligation			Benefit Cost*
Discount Rate		0.25	%	$	(2.5	)	$	—
		(0.25	)%		2.6			—
Expected Return on Plan Assets		0.25	%		—			(0.7	)
		(0.25	)%		—			0.7

* Excludes the impact of regulatory deferral mechanism. See Note 13, Pension Plans and Other Postretirement Benefits, of the Notes to Financial Statements in Item 8 for information regarding the regulatory treatment of these costs.

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Income Taxes – Income tax calculations require estimates due to book-tax differences, estimates with respect to regulatory treatment of certain items, and uncertainty in the interpretation of tax laws and regulations. Critical assumptions and judgments also include projections of future taxable income to determine the ability to utilize net operating losses and credit carryforwards prior to their expiration. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Management regularly assesses financial statement tax provisions to identify any change in regulatory treatment or tax related estimates and assumptions that could have a material impact on cash flows, financial position and/or results of operations. For more information, see Note 12, Income Taxes, of the Notes to Financial Statements in Item 8.

For further discussion of significant accounting policies, see Note 1, Summary of Significant Accounting Policies, of the Notes to Financial Statements in Item 8.

MARKET RISK

Commodity Price Risk

Gas Utility

The Utilities’ commodity price risk, which arises from market fluctuations in the price of natural gas, is primarily managed through the operation of Spire Missouri’s PGA clauses and Spire Alabama’s GSA rider. The PGA clauses and GSA rider allows the Utilities to flow through to customers, subject to prudence review by the MoPSC and APSC, the cost of purchased gas supplies. Spire Missouri is allowed the flexibility to make up to three discretionary PGA changes during each year, in addition to its mandatory November PGA change, so long as such changes are separated by at least two months. Spire Missouri is able to mitigate, to some extent, changes in commodity prices through the use of physical storage supplies and regional supply diversity. Spire Alabama is allowed to make monthly changes to the GSA rate, but increases cannot exceed a 5% increase over the prior effective residential billing rate. The Utilities also have risk management policies that allow for the purchase of natural gas derivative instruments with the goal of managing its price risk associated with purchasing natural gas on behalf of its customers. These policies prohibit speculation. As of September 30, 2023, Spire Missouri had active natural gas derivative positions, but Spire Alabama did not. Costs and cost reduction, including carrying costs, associated with the use of natural gas derivative instruments are allowed to be passed on to customers through the operation of the PGA clauses or GSA rider. Accordingly, the Utilities do not expect any adverse earnings impact as a result of the use of these derivative instruments. However, the timing of recovery for cash payments related to margin requirements may cause short-term cash requirements to vary. For more information about the Utilities’ natural gas derivative instruments, see Note 10, Derivative Instruments and Hedging Activities, of the Notes to Financial Statements in Item 8.

Gas Marketing

In the course of its business, Spire’s non-regulated gas marketing subsidiary, Spire Marketing, enters into contracts to purchase and sell natural gas at fixed prices and natural gas index-based prices. Commodity price risk associated with these contracts has the potential to impact earnings and cash flows. To minimize this risk, Spire Marketing has a risk management policy that provides for daily monitoring of a number of business measures, including fixed price commitments. In accordance with the risk management policy, Spire Marketing manages the price risk associated with its fixed price commitments. This risk is currently managed either by closely matching the offsetting physical purchase or sale of natural gas at fixed-prices or through the use of natural gas futures, options and swap contracts traded on or cleared through the New York Mercantile Exchange (NYMEX) and Intercontinental Exchange (ICE) to lock in margins. At September 30, 2023 and 2022, Spire Marketing’s unmatched fixed-price positions were not material to Spire’s financial position or results of operations.

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As mentioned above, Spire Marketing uses natural gas futures, options and swap contracts traded on or cleared through the NYMEX and ICE to manage the commodity price risk associated with its fixed-price natural gas purchase and sale commitments. These derivative instruments may be designated as cash flow hedges of forecasted purchases or sales. Such accounting treatment, if elected, generally permits a substantial portion of the gain or loss to be deferred from recognition in earnings until the period that the associated forecasted purchase or sale is recognized in earnings. To the extent a hedge is effective, gains or losses on the derivatives will be offset by changes in the value of the hedged forecasted transactions. At September 30, 2022 and 2021, Spire Marketing had no designated cash flow hedges. Information about the fair values of Spire Marketing’s exchange-traded/cleared natural gas derivative instruments is presented below:

	Derivative					Derivatives
	Fair			Cash		and Cash
	Values			Margin		Margin
Net balance of derivative assets at September 30, 2022	$	10.6		$	15.2	$	25.8
Changes in fair value		(35.0	)		—		(35.0	)
Settlements/purchases - net		12.2			—		12.2
Changes in cash margin		—			3.1		3.1
Net balance of derivative assets at September 30, 2023	$	(12.2	)	$	18.3	$	6.1

	As of September 30, 2023
Maturity by Fiscal Year	Total			2024			2025			2026			2027			2028
Fair values of exchange-traded/cleared natural gas derivatives - net	$	(12.1	)	$	(8.6	)	$	(3.3	)	$	(0.2	)	$	—		$	—
Fair values of basis swaps - net		0.5			0.7			—			(0.1	)		(0.1	)		—
Fair values of puts and calls - net		(0.1	)		(0.1	)		—			—			—			—
Position volumes [millions of MMBtu, long or (short)]:
Net futures/swap/option positions		21.4			7.9			9.9			2.3			1.2			0.1
Net basis swap positions		14.1			6.2			3.7			2.2			1.8			0.2
Net puts and calls positions		(0.8	)		(0.8	)		—			—			—			—

Certain of Spire Marketing’s physical natural gas derivative contracts are designated as normal purchases or normal sales, as permitted by GAAP. This election permits the Company to account for the contract in the period the natural gas is delivered. Contracts not designated as normal purchases or normal sales, including those designated as trading activities, are accounted for as derivatives with changes in fair value recognized in earnings in the periods prior to settlement.

Below is a reconciliation of the beginning and ending balances for physical natural gas contracts accounted for as derivatives, none of which will settle beyond fiscal 2024:

Net balance of derivative liabilities at September 30, 2022	$	(8.9	)
Changes in fair value		19.6
Settlements		(1.7	)
Net balance of derivative liabilities at September 30, 2023	$	9.0

For further details related to Spire Marketing’s derivatives and hedging activities, see Note 10, Derivative Instruments and Hedging Activities, of the Notes to Financial Statements in Item 8.

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Counterparty Credit Risk

Spire Marketing has concentrations of counterparty credit risk in that a significant portion of its transactions are with energy producers, utility companies and pipelines. These concentrations of counterparties have the potential to affect the Company’s overall exposure to credit risk, either positively or negatively, in that each of these three groups may be affected similarly by changes in economic, industry or other conditions. Spire Marketing also has concentrations of credit risk with certain individually significant counterparties. To the extent possible, Spire Marketing enters into netting arrangements with its counterparties to mitigate exposure to credit risk. It is also exposed to credit risk associated with its derivative contracts designated as normal purchases and normal sales. Spire Marketing closely monitors its credit exposure and, although uncollectible amounts have not been significant, increased counterparty defaults are possible and may result in financial losses and/or capital limitations. For more information on these and other concentrations of credit risk, including how Spire Marketing manages these risks, see Note 11, Concentrations of Credit Risk, of the Notes to Financial Statements in Item 8.

Interest Rate Risk

The Company is subject to interest rate risk associated with its short-term debt issuances. Based on average short-term borrowings during fiscal 2023, an increase of 100 basis points in the underlying average interest rate for short-term debt would have caused an increase in interest expense (and a decrease in pre-tax earnings and cash flows) of approximately $8.4 on an annual basis. Portions of such an increase may be offset through the Utilities’ application of PGA and GSA carrying costs. At September 30, 2023, Spire had fixed-rate long-term debt totaling $3,432.7, of which $1,498.0 was issued by Spire Missouri, $750.0 was issued by Spire Alabama, and $1,184.7 was issued by Spire and other subsidiaries. While the long-term debt issues are fixed-rate, they are subject to changes in fair value as market interest rates change. However, increases or decreases in fair value would impact earnings and cash flows only if the Company were to reacquire any of these issues in the open market prior to maturity. Under GAAP applicable to the Utilities’ regulated operations, losses or gains on early redemptions of long-term debt would typically be deferred as regulatory assets or regulatory liabilities and amortized over a future period.

Refer to Note 10, Derivative Instruments and Hedging Activities, of the Notes to Financial Statements in Item 8 for details on the Company’s interest rate swap transactions.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

For this discussion, see “Market Risk” in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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Item 8. Financial Statements and Supplementary Data

	Page
Reports of Independent Registered Public Accounting Firm (PCAOB ID 34)	45
Financial Statements (for years ended September 30, 2023, 2022, and 2021):
Spire Inc.
Consolidated Statements of Income	52
Consolidated Statements of Comprehensive Income	53
Consolidated Balance Sheets	54
Consolidated Statements of Shareholders’ Equity	56
Consolidated Statements of Cash Flows	57
Spire Missouri Inc.
Statements of Comprehensive Income	58
Balance Sheets	59
Statements of Shareholder’s Equity	61
Statements of Cash Flows	62
Spire Alabama Inc.
Statements of Income	63
Balance Sheets	64
Statements of Shareholder’s Equity	66
Statements of Cash Flows	67
Notes to Financial Statements
Note 1. Summary of Significant Accounting Policies	68
Note 2. Revenue	74
Note 3. Stock-Based Compensation	76
Note 4. Earnings Per Common Share	79
Note 5. Shareholders’ Equity	79
Note 6. Long-Term Debt	83
Note 7. Notes Payable and Credit Agreements	85
Note 8. Fair Value of Financial Instruments	86
Note 9. Fair Value Measurements	87
Note 10. Derivative Instruments and Hedging Activities	89
Note 11. Concentrations of Credit Risk	95
Note 12. Income Taxes	96
Note 13. Pension Plans and Other Postretirement Benefits	98
Note 14. Information by Operating Segment	109
Note 15. Regulatory Matters	111
Note 16. Commitments and Contingencies	117
Note 17. Leases	120

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of Spire Inc.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Spire Inc. and subsidiaries (the “Company”) as of September 30, 2023, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of September 30, 2023, based on criteria established in Internal Control—Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended September 30, 2023, of the Company and our report dated November 16, 2023, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for their assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management Reports on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of Spire Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Spire Inc. and subsidiaries (the “Company”) as of September 30, 2023 and 2022, the related consolidated statements of income, comprehensive income, shareholders’ equity, and cash flows, for each of the three years in the period ended September 30, 2023, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2023 and 2022, and the results of their operations and their cash flows for each of the three years in the period ended September 30, 2023, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of September 30, 2023, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated November 16, 2023, expressed an unqualified opinion on the Company’s internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Regulatory Matters – Impact of Rate Regulation on the Financial Statements – Refer to Note 15 to the financial statements

Critical Audit Matter Description

The Company accounts for their regulated operations in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 980, Regulated Operations. The provisions of this accounting guidance require, among other things, that financial statements of a rate-regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-rate-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. Also, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities).

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The Company is subject to rate regulation by the Missouri and Alabama Public Service Commissions (the “Commissions”), which have jurisdiction with respect to the rates of natural gas companies within their respective geographies. The Company has stated that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process.

Accounting for the economics of rate regulation affects multiple financial statement line items, including property, plant, and equipment; regulatory assets and liabilities; operating revenues; and depreciation expense, and affects multiple disclosures in the Company’s financial statements. There is a risk that the Commissions will not approve full recovery of the costs of providing utility service or recovery of all amounts invested in the utility business and a reasonable return on that investment. As a result, we identified the impact of rate regulation as a critical audit matter due to the high degree of subjectivity involved in assessing the impact of current and future regulatory orders on events that have occurred as of September 30, 2023, and the judgments made by management to support its assertions about impacted account balances and disclosures. Management judgments included assessing the likelihood of (1) recovery in future rates of incurred costs or (2) refunds to customers or future reduction in rates. Given that management’s accounting judgments are based on assumptions about the outcome of future decisions by the Commissions, auditing these rate-impacted account balances and disclosures, and the related judgments, requires specialized knowledge of accounting for rate regulation due to the inherent complexities associated with the specialized rules related to accounting for the effects of cost-based regulation.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the uncertainty of future decisions by the Commissions included the following, among others:

• We tested the effectiveness of management’s controls over evaluating the likelihood of (1) the recovery in future rates of costs incurred as property, plant, and equipment and deferred as regulatory assets, and (2) a refund or a future reduction in rates that should be reported as regulatory liabilities. We tested the effectiveness of management’s controls over the initial recognition of amounts as property, plant, and equipment; regulatory assets or liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering costs in future rates or of a future reduction in rates.

• We evaluated the Company’s disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, in the financial statements.

• We read relevant regulatory orders issued by the Commissions for the Company in Missouri, Alabama, and Mississippi; regulatory statutes, interpretations, procedural memorandums, and filings made by interveners; and other publicly available information to assess the likelihood of recovery in future rates or of a future reduction in rates based on precedents of the Commissions’ treatment of similar costs under similar circumstances.

• We obtained from management the regulatory orders that support the probability of recovery, refund, and/or future reduction in rates for regulatory assets and liabilities and assessed management’s assertion that amounts are probable of recovery, refund, or a future reduction in rates.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

We have served as the Company’s auditor since 1953.

47

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholder and the Board of Directors of Spire Missouri Inc.

Opinion on the Financial Statements

We have audited the accompanying balance sheets of Spire Missouri Inc. (a wholly owned subsidiary of Spire Inc.) (the “Company”) as of September 30, 2023 and 2022, the related statements of comprehensive income, shareholder’s equity, and cash flows, for each of the three years in the period ended September 30, 2023, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2023 and 2022, and the results of their operations and their cash flows for each of the three years in the period ended September 30, 2023, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of their internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Regulatory Matters – Impact of Rate Regulation on the Financial Statements – Refer to Note 15 to the financial statements

Critical Audit Matter Description

The Company accounts for their regulated operations in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 980, Regulated Operations. The provisions of this accounting guidance require, among other things, that financial statements of a rate-regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-rate-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. Also, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities).

48

The Company is subject to rate regulation by the Missouri Public Service Commission (the “Commission”), which has jurisdiction with respect to the rates of natural gas companies within Missouri’s geography. The Company has stated that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process.

Accounting for the economics of rate regulation affects multiple financial statement line items, including property, plant, and equipment; regulatory assets and liabilities; operating revenues; and depreciation expense, and affects multiple disclosures in the Company’s financial statements. There is a risk that the Commission will not approve full recovery of the costs of providing utility service or recovery of all amounts invested in the utility business and a reasonable return on that investment. As a result, we identified the impact of rate regulation as a critical audit matter due to the high degree of subjectivity involved in assessing the impact of current and future regulatory orders on events that have occurred as of September 30, 2023, and the judgments made by management to support their assertions about impacted account balances and disclosures. Management judgments included assessing the likelihood of (1) recovery in future rates of incurred costs or (2) refunds to customers or future reduction in rates. Given that management’s accounting judgments are based on assumptions about the outcome of future decisions by the Commission, auditing these rate-impacted account balances and disclosures, and the related judgments, requires specialized knowledge of accounting for rate regulation due to the inherent complexities associated with the specialized rules related to accounting for the effects of cost-based regulation.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the uncertainty of future decisions by the Commission included the following, among others:

• We tested the effectiveness of management’s controls over evaluating the likelihood of (1) the recovery in future rates of costs incurred as property, plant, and equipment and deferred as regulatory assets, and (2) a refund or a future reduction in rates that should be reported as regulatory liabilities. We tested the effectiveness of management’s controls over the initial recognition of amounts as property, plant, and equipment; regulatory assets or liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering costs in future rates or of a future reduction in rates.

• We evaluated the Company’s disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, in the financial statements.

• We read relevant regulatory orders issued by the Commission for the Company in Missouri; regulatory statutes, interpretations, procedural memorandums, and filings made by interveners; and other publicly available information to assess the likelihood of recovery in future rates or of a future reduction in rates based on precedents of the Commission’s treatment of similar costs under similar circumstances.

• We obtained from management the regulatory orders that support the probability of recovery, refund, and/or future reduction in rates for regulatory assets and liabilities and assessed management’s assertion that amounts are probable of recovery, refund, or a future reduction in rates.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

We have served as the Company’s auditor since 1953.

49

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholder and the Board of Directors of Spire Alabama Inc.

Opinion on the Financial Statements

We have audited the accompanying balance sheets of Spire Alabama Inc. (a wholly owned subsidiary of Spire Inc.) (the “Company”) as of September 30, 2023 and 2022, the related statements of income, shareholder’s equity, and cash flows, for each of the three years in the period ended September 30, 2023, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2023 and 2022, and the results of their operations and their cash flows for each of the three years in the period ended September 30, 2023, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of their internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Regulatory Matters – Impact of Rate Regulation on the Financial Statements – Refer to Note 15 to the financial statements

Critical Audit Matter Description

The Company accounts for their regulated operations in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 980, Regulated Operations. The provisions of this accounting guidance require, among other things, that financial statements of a rate-regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-rate-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. Also, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities).

50

The Company is subject to rate regulation by the Alabama Public Service Commission (the “Commission”), which has jurisdiction with respect to the rates of natural gas companies within Alabama’s geography. The Company has stated that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process.

Accounting for the economics of rate regulation affects multiple financial statement line items, including property, plant, and equipment; regulatory assets and liabilities; operating revenues; and depreciation expense, and affects multiple disclosures in the Company’s financial statements. There is a risk that the Commission will not approve full recovery of the costs of providing utility service or recovery of all amounts invested in the utility business and a reasonable return on that investment. As a result, we identified the impact of rate regulation as a critical audit matter due to the high degree of subjectivity involved in assessing the impact of current and future regulatory orders on events that have occurred as of September 30, 2023, and the judgments made by management to support their assertions about impacted account balances and disclosures. Management judgments included assessing the likelihood of (1) recovery in future rates of incurred costs or (2) refunds to customers or future reduction in rates. Given that management’s accounting judgments are based on assumptions about the outcome of future decisions by the Commission, auditing these rate-impacted account balances and disclosures, and the related judgments, requires specialized knowledge of accounting for rate regulation due to the inherent complexities associated with the specialized rules related to accounting for the effects of cost-based regulation.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the uncertainty of future decisions by the Commission included the following, among others:

• We tested the effectiveness of management’s controls over evaluating the likelihood of (1) the recovery in future rates of costs incurred as property, plant, and equipment and deferred as regulatory assets, and (2) a refund or a future reduction in rates that should be reported as regulatory liabilities. We tested the effectiveness of management’s controls over the initial recognition of amounts as property, plant, and equipment; regulatory assets or liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering costs in future rates or of a future reduction in rates.

• We evaluated the Company’s disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, in the financial statements.

• We read relevant regulatory orders issued by the Commission for the Company in Alabama; regulatory statutes, interpretations, procedural memorandums, and filings made by interveners; and other publicly available information to assess the likelihood of recovery in future rates or of a future reduction in rates based on precedents of the Commission’s treatment of similar costs under similar circumstances.

• We obtained from management the regulatory orders that support the probability of recovery, refund, and/or future reduction in rates for regulatory assets and liabilities and assessed management’s assertion that amounts are probable of recovery, refund, or a future reduction in rates.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

We have served as the Company’s auditor since 2014.

51

SPIRE INC.

CONSOLIDATED STATEMENTS OF INCOME

	Years Ended September 30
(In millions, except per share amounts)	2023		2022			2021
Operating Revenues	$	2,666.3	$	2,198.5		$	2,235.5
Operating Expenses:
Natural gas		1,260.8		923.9			946.3
Operation and maintenance		517.6		449.6			465.8
Depreciation and amortization		254.8		237.3			213.1
Taxes, other than income taxes		214.5		179.5			160.1
Total Operating Expenses		2,247.7		1,790.3			1,785.3
Operating Income		418.6		408.2			450.2
Interest Expense		185.7		119.8			106.6
Other Income (Expense), Net		23.4		(8.7	)		(3.4	)
Income Before Income Taxes		256.3		279.7			340.2
Income Tax Expense		38.8		58.9			68.5
Net Income		217.5		220.8			271.7
Provision for preferred dividends		14.8		14.8			14.8
Income allocated to participating securities		0.3		0.3			0.4
Net Income Available to Common Shareholders	$	202.4	$	205.7		$	256.5
Weighted Average Number of Common Shares Outstanding:
Basic		52.5		52.0			51.6
Diluted		52.6		52.1			51.7
Basic Earnings Per Share of Common Stock	$	3.86	$	3.96		$	4.97
Diluted Earnings Per Share of Common Stock	$	3.85	$	3.95		$	4.96

See the accompanying Notes to Financial Statements.

52

SPIRE INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Years Ended September 30
(In millions)	2023			2022			2021
Net Income	$	217.5		$	220.8		$	271.7
Other Comprehensive Income, Before Tax:
Cash flow hedging derivative instruments:
Net hedging gain arising during the period		20.1			56.7			61.2
Amounts reclassified into regulatory liabilities		(17.5	)		—			—
Amounts reclassified into net income		(2.4	)		(1.2	)		(1.3	)
Net gain on cash flow hedging derivative instruments		0.2			55.5			59.9
Net gain (loss) on defined benefit pension and other postretirement plans		0.2			1.5			(1.3	)
Net unrealized gain (loss) on available-for-sale debt securities		0.1			(0.4	)		(0.2	)
Other Comprehensive Income, Before Tax		0.5			56.6			58.4
Income Tax Expense Related to Items of Other Comprehensive Income		0.1			13.0			13.6
Other Comprehensive Income, Net of Tax		0.4			43.6			44.8
Comprehensive Income	$	217.9		$	264.4		$	316.5

See the accompanying Notes to Financial Statements.

53

SPIRE INC.

CONSOLIDATED BALANCE SHEETS

	September 30
(Dollars in millions, except per share amounts)	2023			2022
ASSETS
Utility Plant	$	8,210.1		$	7,664.9
Less: Accumulated depreciation and amortization		2,431.2			2,294.5
Net Utility Plant		5,778.9			5,370.4
Non-utility Property (net of accumulated depreciation and amortization of $71.1 and $50.7 at September 30, 2023 and 2022, respectively)		628.5			491.4
Other Investments		102.6			87.8
Total Other Property and Investments		731.1			579.2
Current Assets:
Cash and cash equivalents		5.6			6.5
Accounts receivable:
Utility		192.4			210.8
Other		128.6			443.8
Allowance for credit losses		(32.5	)		(31.9	)
Delayed customer billings		22.0			21.3
Inventories:
Natural gas		223.7			371.8
Propane gas		8.6			8.6
Materials and supplies		47.2			41.9
Regulatory assets		348.3			355.4
Prepayments		48.2			41.1
Other		84.8			122.7
Total Current Assets		1,076.9			1,592.0
Deferred Charges and Other Assets:
Goodwill		1,171.6			1,171.6
Regulatory assets		1,249.2			1,112.4
Other		305.9			258.1
Total Deferred Charges and Other Assets		2,726.7			2,542.1
Total Assets	$	10,313.6		$	10,083.7

54

SPIRE INC.

CONSOLIDATED BALANCE SHEETS (Continued)

	September 30
	2023		2022
CAPITALIZATION AND LIABILITIES
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at September 30, 2023 and 2022)	$	242.0	$	242.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 53.2 million shares and 52.5 million shares issued and outstanding at September 30, 2023, and 2022, respectively)		53.2		52.5
Paid-in capital		1,616.5		1,571.3
Retained earnings		958.0		905.5
Accumulated other comprehensive income		47.6		47.2
Total Shareholders' Equity		2,917.3		2,818.5
Temporary equity		16.5		13.1
Long-term debt (less current portion)		3,554.0		2,958.5
Total Capitalization		6,487.8		5,790.1
Current Liabilities:
Current portion of long-term debt		156.6		281.2
Notes payable		955.5		1,037.5
Accounts payable		253.1		617.4
Advance customer billings		20.9		18.7
Wages and compensation accrued		47.0		50.2
Customer deposits		27.7		28.2
Taxes accrued		104.1		90.1
Regulatory liabilities		7.3		3.7
Other		183.2		226.6
Total Current Liabilities		1,755.4		2,353.6
Deferred Credits and Other Liabilities:
Deferred income taxes		743.7		675.1
Pension and postretirement benefit costs		137.3		163.0
Asset retirement obligations		577.4		520.9
Regulatory liabilities		472.4		418.2
Other		139.6		162.8
Total Deferred Credits and Other Liabilities		2,070.4		1,940.0
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities	$	10,313.6	$	10,083.7

See the accompanying Notes to Financial Statements.

55

SPIRE INC.

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(Dollars in millions,	Common Stock					Preferred		Paid-in			Retained
except per share amounts)	Shares			Par		Stock		Capital			Earnings			AOCI*			Total
Balance at September 30, 2020		51,611,789		$	51.6	$	242.0	$	1,549.2		$	720.7		$	(41.2	)	$	2,522.3
Net income		—			—		—		—			271.7			—			271.7
Dividend reinvestment plan		24,565			—		—		1.6			—			—			1.6
Stock-based compensation costs		—			—		—		9.1			—			—			9.1
Stock issued under stock-based compensation plans		65,316			0.1		—		(0.1	)		—			—			—
Employees’ tax withholding for stock-based compensation		(16,787	)		—		—		(1.1	)		—			—			(1.1	)
Equity units issued		—			—		—		(40.8	)		—			—			(40.8	)
Temporary equity adjustment to redemption value		—			—		—		—			1.3			—			1.3
Dividends declared:
Common stock ($2.60 per share)		—			—		—		—			(135.9	)		—			(135.9	)
Preferred stock ($1.475 per depositary share)		—			—		—		—			(14.8	)		—			(14.8	)
Other comprehensive income, net of tax		—			—		—		—			—			44.8			44.8
Balance at September 30, 2021		51,684,883		$	51.7	$	242.0	$	1,517.9		$	843.0		$	3.6		$	2,658.2
Net income		—			—		—		—			220.8			—			220.8
Common stock issued		719,625			0.7		—		49.6			—			—			50.3
Dividend reinvestment plan		24,154			—		—		1.6			—			—			1.6
Stock-based compensation costs		—			—		—		4.1			—			—			4.1
Stock issued under stock-based compensation plans		93,936			0.1		—		(0.1	)		—			—			—
Employees’ tax withholding for stock-based compensation		(28,055	)		—		—		(1.8	)		—			—			(1.8	)
Dividends declared:
Common stock ($2.74 per share)		—			—		—		—			(143.5	)		—			(143.5	)
Preferred stock ($1.475 per depositary share)		—			—		—		—			(14.8	)		—			(14.8	)
Other comprehensive income, net of tax		—			—		—		—			—			43.6			43.6
Balance at September 30, 2022		52,494,543		$	52.5	$	242.0	$	1,571.3		$	905.5		$	47.2		$	2,818.5
Net income		—			—		—		—			217.5			—			217.5
Common stock issued		611,872			0.6		—		39.9			—			—			40.5
Dividend reinvestment plan		22,230			—		—		1.5			—			—			1.5
Stock-based compensation costs		—			—		—		5.3			—			—			5.3
Stock issued under stock-based compensation plans		60,007			0.1		—		(0.1	)		—			—			—
Employees’ tax withholding for stock-based compensation		(18,428	)		—		—		(1.4	)		—			—			(1.4	)
Temporary equity adjustment to redemption value		—			—		—		—			2.3			—			2.3
Dividends declared:
Common stock ($2.88 per share)		—			—		—		—			(152.5	)		—			(152.5	)
Preferred stock ($1.475 per depositary share)		—			—		—		—			(14.8	)		—			(14.8	)
Other comprehensive income, net of tax		—			—		—		—			—			0.4			0.4
Balance at September 30, 2023		53,170,224		$	53.2	$	242.0	$	1,616.5		$	958.0		$	47.6		$	2,917.3

* Accumulated other comprehensive income (loss)

See the accompanying Notes to Financial Statements.

56

SPIRE INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Years Ended September 30
(In millions)	2023			2022			2021
Operating Activities:
Net Income	$	217.5		$	220.8		$	271.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		254.8			237.3			213.1
Deferred income taxes and investment tax credits		36.9			57.9			67.0
Changes in assets and liabilities:
Accounts receivable		334.2			(26.5	)		(343.0	)
Inventories		142.8			(117.2	)		(111.0	)
Regulatory assets and liabilities		(68.7	)		(409.0	)		76.6
Accounts payable		(389.2	)		190.7			177.7
Delayed/advance customer billings, net		1.5			(25.5	)		(12.4	)
Taxes accrued		15.0			11.2			8.9
Other assets and liabilities		(117.6	)		(93.5	)		(116.1	)
Other		13.0			8.8			17.3
Net cash provided by operating activities		440.2			55.0			249.8
Investing Activities:
Capital expenditures		(662.5	)		(552.2	)		(624.8	)
Business acquisition		(37.0	)		—			—
Other		4.0			5.5			2.8
Net cash used in investing activities		(695.5	)		(546.7	)		(622.0	)
Financing Activities:
Issuance of long-term debt		755.0			300.0			629.1
Repayment of long-term debt		(281.2	)		(55.8	)		(115.4	)
(Repayment) Issuance of short-term debt, net		(82.0	)		365.5			24.0
Issuance of common stock		41.9			51.9			1.0
Dividends paid on common stock		(150.7	)		(141.9	)		(133.2	)
Dividends paid on preferred stock		(14.8	)		(14.8	)		(14.8	)
Other		(7.6	)		(4.0	)		(11.3	)
Net cash provided by financing activities		260.6			500.9			379.4
Net Increase in Cash, Cash Equivalents, and Restricted Cash		5.3			9.2			7.2
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year		20.5			11.3			4.1
Cash, Cash Equivalents, and Restricted Cash at End of Year	$	25.8		$	20.5		$	11.3
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	$	(177.5	)	$	(119.9	)	$	(98.7	)
Income taxes		(2.0	)		(1.8	)		(1.5	)

See the accompanying Notes to Financial Statements.

57

SPIRE MISSOURI INC.

STATEMENTS OF COMPREHENSIVE INCOME

	Years Ended September 30
(In millions)	2023		2022			2021
Operating Revenues	$	1,762.9	$	1,321.0		$	1,516.6
Operating Expenses:
Natural gas		943.4		587.0			786.8
Operation and maintenance		296.2		255.7			261.1
Depreciation and amortization		158.7		145.3			129.2
Taxes, other than income taxes		157.5		129.0			110.9
Total Operating Expenses		1,555.8		1,117.0			1,288.0
Operating Income		207.1		204.0			228.6
Interest Expense		97.4		60.9			50.3
Other Income (Expense), Net		19.4		(6.9	)		(8.9	)
Income Before Income Taxes		129.1		136.2			169.4
Income Tax Expense		11.6		21.3			25.3
Net Income		117.5		114.9			144.1
Other Comprehensive Income (Loss), Net of Tax		0.2		1.5			(1.3	)
Comprehensive Income	$	117.7	$	116.4		$	142.8

See the accompanying Notes to Financial Statements.

58

SPIRE MISSOURI INC.

BALANCE SHEETS

	September 30
(Dollars in millions, except per share amounts)	2023			2022
ASSETS
Utility Plant	$	4,964.9		$	4,550.4
Less: Accumulated depreciation and amortization		1,043.2			982.1
Net Utility Plant		3,921.7			3,568.3
Other Property and Investments		65.7			58.9
Current Assets:
Cash and cash equivalents		0.8			—
Accounts receivable:
Utility		142.6			131.5
Associated companies		1.3			3.7
Other		21.1			44.5
Allowance for credit losses		(26.2	)		(24.9	)
Delayed customer billings		17.9			16.1
Inventories:
Natural gas		132.8			215.3
Propane gas		8.6			8.6
Materials and supplies		24.2			22.0
Regulatory assets		293.1			288.1
Prepayments	26.7			23.3
Total Current Assets		642.9			728.2
Deferred Charges and Other Assets:
Goodwill		210.2			210.2
Regulatory assets		617.6			547.6
Other		147.4			105.0
Total Deferred Charges and Other Assets		975.2			862.8
Total Assets	$	5,605.5		$	5,218.2

59

SPIRE MISSOURI INC.

BALANCE SHEETS (continued)

	September 30
	2023			2022
CAPITALIZATION AND LIABILITIES
Capitalization:
Common stock (par value $1.00 per share; 50.0 million shares authorized; 25,855 and 25,325 issued and outstanding at September 30, 2023 and 2022, respectively)	$	0.1		$	0.1
Paid-in capital		854.8			816.1
Retained earnings		992.4			931.9
Accumulated other comprehensive loss		(2.5	)		(2.7	)
Total Shareholder's Equity		1,844.8			1,745.4
Long-term debt (less current portion)		1,785.4			1,387.7
Total Capitalization		3,630.2			3,133.1
Current Liabilities:
Current portion of long-term debt		—			250.0
Notes payable – associated companies		540.6			445.3
Accounts payable		85.8			119.0
Accounts payable – associated companies		10.5			13.3
Advance customer billings	11.0				7.0
Wages and compensation accrued		23.6			33.8
Customer deposits		5.8			6.5
Taxes accrued		60.3			50.4
Other		48.7			45.6
Total Current Liabilities		786.3			970.9
Deferred Credits and Other Liabilities:
Deferred income taxes		531.8			500.1
Pension and postretirement benefit costs		103.3			115.5
Asset retirement obligations		111.1			110.6
Regulatory liabilities		389.4			331.8
Other		53.4			56.2
Total Deferred Credits and Other Liabilities		1,189.0			1,114.2
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities	$	5,605.5		$	5,218.2

See the accompanying Notes to Financial Statements.

60

SPIRE MISSOURI INC.

STATEMENTS OF SHAREHOLDER’S EQUITY

	Common Stock				Paid-in		Retained
(Dollars in millions)	Shares		Par		Capital		Earnings			AOCI*			Total
Balance at September 30, 2020		24,577	$	0.1	$	765.0	$	672.9		$	(2.9	)	$	1,435.1
Net income		—		—		—		144.1			—			144.1
Other comprehensive loss, net of tax		—		—		—		—			(1.3	)		(1.3	)
Balance at September 30, 2021		24,577		0.1		765.0		817.0			(4.2	)		1,577.9
Net income		—		—		—		114.9			—			114.9
Common stock issued to Spire Inc.		748		—		51.1		—			—			51.1
Other comprehensive income, net of tax		—		—		—		—			1.5			1.5
Balance at September 30, 2022		25,325		0.1		816.1		931.9			(2.7	)		1,745.4
Net income		—		—		—		117.5			—			117.5
Common stock issued to Spire Inc.		530		—		38.7		—			—			38.7
Dividends declared		—		—		—		(57.0	)		—			(57.0	)
Other comprehensive income, net of tax		—		—		—		—			0.2			0.2
Balance at September 30, 2023		25,855	$	0.1	$	854.8	$	992.4		$	(2.5	)	$	1,844.8

* Accumulated other comprehensive income (loss)

See the accompanying Notes to Financial Statements.

61

SPIRE MISSOURI INC.

STATEMENTS OF CASH FLOWS

	Years Ended September 30
(In millions)	2023			2022			2021
Operating Activities:
Net Income	$	117.5		$	114.9		$	144.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		158.7			145.3			129.2
Deferred income taxes and investment tax credits		11.6			21.3			25.3
Changes in assets and liabilities:
Accounts receivable		16.0			163.8			(207.4	)
Inventories		80.2			(45.4	)		(79.0	)
Regulatory assets and liabilities		(22.4	)		(314.3	)		35.9
Accounts payable		(45.7	)		25.3			23.1
Delayed/advance customer billings, net		2.2			(26.4	)		(13.0	)
Taxes accrued		9.7			9.3			2.1
Other assets and liabilities		(108.4	)		(48.0	)		(115.0	)
Other		1.7			1.4			0.7
Net cash provided by (used in) operating activities		221.1			47.2			(54.0	)
Investing Activities:
Capital expenditures		(447.5	)		(354.1	)		(382.6	)
Other		4.1			3.6			1.3
Net cash used in investing activities		(443.4	)		(350.5	)		(381.3	)
Financing Activities:
Issuance of long-term debt		400.0			300.0			304.1
Repayment of long-term debt		(250.0	)		—			(55.0	)
(Repayment) issuance of short-term debt, net		—			(250.0	)		250.0
Borrowings from (repayments to) Spire, net		95.3			204.4			(60.3	)
Issuance of common stock		38.7			51.1			—
Dividends paid		(57.0	)		—			—
Other		(3.9	)		(2.2	)		(3.5	)
Net cash provided by financing activities		223.1			303.3			435.3
Net Increase in Cash and Cash Equivalents		0.8			—			—
Cash and Cash Equivalents at Beginning of Year		—			—			—
Cash and Cash Equivalents at End of Year	$	0.8		$	—		$	—
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	$	(93.8	)	$	(58.9	)	$	(45.9	)
Income taxes		(0.2	)		—			—

See the accompanying Notes to Financial Statements.

62

SPIRE ALABAMA INC.

STATEMENTS OF INCOME

	Years Ended September 30
(In millions)	2023		2022		2021
Operating Revenues	$	571.1	$	509.1	$	494.0
Operating Expenses:
Natural gas		202.7		161.5		145.3
Operation and maintenance		136.4		130.1		132.5
Depreciation and amortization		69.3		66.8		62.1
Taxes, other than income taxes		43.0		38.1		37.1
Total Operating Expenses		451.4		396.5		377.0
Operating Income		119.7		112.6		117.0
Interest Expense	34.9		21.3			20.2
Other Income, Net		1.5		0.4		2.0
Income Before Income Taxes		86.3		91.7		98.8
Income Tax Expense		20.3		23.2		25.0
Net Income	$	66.0	$	68.5	$	73.8

See the accompanying Notes to Financial Statements.

63

SPIRE ALABAMA INC.

BALANCE SHEETS

	September 30
(Dollars in millions, except per share amounts)	2023			2022
ASSETS
Utility Plant	$	2,862.6		$	2,732.6
Less: Accumulated depreciation and amortization		1,273.0			1,184.1
Net Utility Plant		1,589.6			1,548.5
Current Assets:
Cash and cash equivalents		1.2			2.4
Accounts receivable:
Utility		42.2			69.9
Associated companies		1.2			1.3
Other		6.6			6.5
Allowance for credit losses		(5.7	)		(6.3	)
Delayed customer billings		3.6			4.8
Inventories:
Natural gas		52.4			72.5
Materials and supplies		19.1			16.3
Regulatory assets		41.6			56.9
Prepayments		6.4			5.8
Total Current Assets		168.6			230.1
Deferred Charges and Other Assets:
Regulatory assets		606.9			538.2
Deferred income tax		—			11.0
Other		84.2			81.3
Total Deferred Charges and Other Assets		691.1			630.5
Total Assets	$	2,449.3		$	2,409.1

64

SPIRE ALABAMA INC.

BALANCE SHEETS (continued)

	September 30
	2023		2022
CAPITALIZATION AND LIABILITIES
Capitalization:
Common stock and paid-in capital (par value $0.01 per share; 3,000,000 shares authorized; 1,972,052 issued and outstanding at September 30, 2023 and 2022)	$	285.9	$	316.9
Retained earnings		642.1		589.1
Total Shareholder's Equity		928.0		906.0
Long-term debt		745.9		571.5
Total Capitalization		1,673.9		1,477.5
Current Liabilities:
Notes payable – associated companies		124.1		260.9
Accounts payable		28.4		85.6
Accounts payable – associated companies		4.6		4.4
Advance customer billings		8.1		9.9
Wages and compensation accrued		6.6		7.6
Customer deposits		19.3		19.0
Taxes accrued		34.5		31.3
Other		14.7		22.4
Total Current Liabilities		240.3		441.1
Deferred Credits and Other Liabilities:
Deferred income taxes		9.1		—
Pension and postretirement benefit costs		27.2		40.5
Asset retirement obligations		451.0		398.7
Regulatory liabilities		21.2		23.0
Other		26.6		28.3
Total Deferred Credits and Other Liabilities		535.1		490.5
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities	$	2,449.3	$	2,409.1

See the accompanying Notes to Financial Statements.

65

SPIRE ALABAMA INC.

STATEMENTS OF SHAREHOLDER’S EQUITY

	Common Stock				Paid-in			Retained
(Dollars in millions)	Shares		Par		Capital			Earnings			Total
Balance at September 30, 2020		1,972,052	$	—	$	350.9		$	500.8		$	851.7
Net income		—		—		—			73.8			73.8
Dividends declared		—		—		—			(22.0	)		(22.0	)
Return of capital to Spire		—		—		(22.0	)		—			(22.0	)
Balance at September 30, 2021		1,972,052		—		328.9			552.6			881.5
Net income		—		—		—			68.5			68.5
Dividends declared		—		—		—			(32.0	)		(32.0	)
Return of capital to Spire		—		—		(12.0	)		—			(12.0	)
Balance at September 30, 2022		1,972,052		—		316.9			589.1			906.0
Net income		—		—		—			66.0			66.0
Dividends declared		—		—		—			(13.0	)		(13.0	)
Return of capital to Spire		—		—		(31.0	)		—			(31.0	)
Balance at September 30, 2023		1,972,052	$	—	$	285.9		$	642.1		$	928.0

See the accompanying Notes to Financial Statements.

66

SPIRE ALABAMA INC.

STATEMENTS OF CASH FLOWS

	Years Ended September 30
(In millions)	2023			2022			2021
Operating Activities:
Net Income	$	66.0		$	68.5		$	73.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		69.3			66.8			62.1
Deferred income taxes		20.3			23.2			25.0
Changes in assets and liabilities:
Accounts receivable		27.1			(21.2	)		(17.8	)
Inventories		17.2			(42.5	)		(15.4	)
Regulatory assets and liabilities		(49.5	)		(101.7	)		29.2
Accounts payable		(42.3	)		26.3			14.0
Delayed/advance customer billings		(0.6	)		0.5			0.5
Taxes accrued		3.3			0.8			2.5
Other assets and liabilities		18.7			(3.7	)		(37.8	)
Other		0.4			0.2			0.3
Net cash provided by operating activities		129.9			17.2			136.4
Investing Activities:
Capital expenditures		(117.6	)		(141.5	)		(169.8	)
Other		1.3			0.8			0.7
Net cash used in investing activities		(116.3	)		(140.7	)		(169.1	)
Financing Activities:
Issuance of long-term debt		175.0			—			150.0
Repayment of long-term debt		—			(50.0	)		—
(Repayments to) borrowings from Spire, net		(136.8	)		211.9			(72.4	)
Return of capital to Spire		(31.0	)		(12.0	)		(22.0	)
Dividends paid		(21.0	)		(24.0	)		(22.0	)
Other		(1.0	)		—			(0.9	)
Net cash (used in) provided by financing activities		(14.8	)		125.9			32.7
Net (Decrease) Increase in Cash and Cash Equivalents		(1.2	)		2.4			—
Cash and Cash Equivalents at Beginning of Year		2.4			—			—
Cash and Cash Equivalents at End of Year	$	1.2		$	2.4		$	—
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	$	(30.1	)	$	(21.0	)	$	(17.9	)
Income taxes		—			—			—

See the accompanying Notes to Financial Statements.

67

SPIRE INC., SPIRE MISSOURI INC., AND SPIRE ALABAMA INC.

NOTES TO FINANCIAL STATEMENTS

(Dollars in millions, except per share, per unit and per gallon amounts)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION – These notes are an integral part of the accompanying audited financial statements of Spire Inc. (“Spire” or the “Company”) presented on a consolidated basis, Spire Missouri Inc. (“Spire Missouri”) and Spire Alabama Inc. (“Spire Alabama”). Spire Missouri, Spire Alabama and Spire EnergySouth Inc. (“Spire EnergySouth”) are wholly owned subsidiaries of Spire. Spire Missouri, Spire Alabama and the subsidiaries of Spire EnergySouth (Spire Gulf Inc. and Spire Mississippi Inc.) are collectively referred to as the “Utilities.” Unless otherwise indicated, references to years herein are references to the fiscal years ending September 30 for the Company and its subsidiaries.

The accompanying audited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial position, results of operations and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not been eliminated from their separate financial statements.

NATURE OF OPERATIONS – Spire has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment consists of the regulated natural gas distribution operations of the Company and is the core business segment of Spire in terms of revenue and earnings. The Gas Utility segment is comprised of the operations of: Spire Missouri, serving St. Louis, Kansas City, and other areas in Missouri; Spire Alabama, serving central and northern Alabama; and the subsidiaries of Spire EnergySouth, serving the Mobile, Alabama area and south-central Mississippi. The Gas Marketing segment includes Spire’s primary gas-related business, Spire Marketing Inc. (“Spire Marketing”), which provides non-regulated natural gas services throughout the United States (U.S.). The Midstream segment includes Spire STL Pipeline and Spire Storage, which are subsidiaries engaged in the transportation and storage of natural gas. The activities of the Company’s other subsidiaries are reported as Other and are described in Note 14, Information by Operating Segment. Spire Missouri and Spire Alabama each have a single reportable segment.

USE OF ESTIMATES – The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

SYSTEM OF ACCOUNTS – The accounts of the Utilities are maintained in accordance with the Uniform System of Accounts prescribed by the applicable state public service commissions, which systems substantially conform to that prescribed by the Federal Energy Regulatory Commission (FERC).

REGULATED OPERATIONS – The Utilities account for their regulated operations in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 980, Regulated Operations. This topic sets forth the application of GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. The provisions of this accounting guidance require, among other things, that financial statements of a regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. In addition, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities). Management believes that the current regulatory environment supports the continued use of these regulatory accounting principles and that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process. See additional discussion on regulated operations in Note 15, Regulatory Matters.

68

 

PROPERTY, PLANT, AND EQUIPMENT –

Utility Plant – Utility plant is stated at original cost. The cost of additions to utility plant includes contracted work, direct labor and materials, allocable overheads and an allowance for funds used during construction. The costs of units of property retired, replaced or renewed are removed from utility plant and are charged to accumulated depreciation. Maintenance and repairs of property and replacement and renewal of items determined to be less than units of property are charged to maintenance expenses.

Utility plant is depreciated using the composite method on a straight-line basis over the estimated service lives of the various classes of property at rates approved by the applicable regulatory commission. For Spire Missouri and for Spire Alabama, the annual depreciation and amortization expense in fiscal years 2023, 2022 and 2021 averaged approximately 3% of the original cost of depreciable and amortizable property.

Non-utility Property – Non-utility property is recorded at the original cost of acquisition or construction, which includes material, labor, contractor services and, for FERC-regulated projects, an allowance for funds used during construction. Repairs, replacements and renewals of items of property determined to be less than a unit of property or that do not increase the property’s life or functionality are charged to maintenance expense. Upon retirement or sale of non-utility property, the original cost and related accumulated depreciation are removed from the accounts and any gain or loss is included in the income statements. Costs related to software developed or obtained for internal use are capitalized and amortized on a straight-line basis over the estimated useful life of the related software. If software is retired prior to being fully amortized, the difference is recorded as a loss in the income statements.

Accrued Capital Expenditures – Accrued capital expenditures, shown in the following table, are excluded from capital expenditures in the statements of cash flows until paid.

September 30	2023		2022		2021
Spire	$	104.3	$	77.8	$	59.5
Spire Missouri		56.5		45.6		37.1
Spire Alabama		4.6		19.2		13.6

ASSET RETIREMENT OBLIGATIONS – Spire, Spire Missouri and Spire Alabama record legal obligations associated with the retirement of long-lived assets in the period in which the obligations are incurred, if sufficient information exists to reasonably estimate the fair value of the obligations. Obligations are recorded as both a cost of the related long-lived asset and as a corresponding liability. Subsequently, the asset retirement costs are depreciated over the life of the asset and the asset retirement obligations are accreted to the expected settlement amounts. Spire, Spire Missouri and Spire Alabama record asset retirement obligations associated with certain safety requirements to purge and seal gas distribution mains upon retirement, the plugging and abandonment of storage wells and other storage facilities, specific service line obligations, and certain removal and disposal obligations related to components of Spire Missouri’s, Spire Alabama’s and Spire Gulf’s distribution systems and general plant. Asset retirement obligations recorded by Spire’s other subsidiaries are not material. As authorized by the Missouri Public Service Commission (MoPSC) and the Alabama Public Service Commission (APSC), Spire Missouri, Spire Alabama and Spire Gulf accrue future asset removal costs associated with their property, plant and equipment even if a legal obligation does not exist. Such accruals are provided for through depreciation expense and are recorded with corresponding credits to regulatory liabilities or regulatory assets. When those utilities retire depreciable utility plant and equipment, they charge the associated original costs to accumulated depreciation and amortization, and any related removal costs incurred are charged to regulatory liabilities or regulatory assets. The difference between removal costs recognized in depreciation rates and the accretion expense and depreciation expense recognized for financial reporting purposes is a timing difference between recovery of these costs in rates and their recognition for financial reporting purposes. Accordingly, these differences are deferred as regulatory liabilities or regulatory assets. In the rate setting process, the regulatory liabilities or regulatory assets are excluded from the rate base upon which those utilities have the opportunity to earn their allowed rates of return.

69

 

The following table presents a reconciliation of the beginning and ending balances of asset retirement obligations at September 30, as reported in the balance sheets.

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Asset retirement obligations, beginning of year	$	520.9		$	519.6		$	110.6		$	143.4		$	398.7		$	362.8
Liabilities incurred during the period		7.9			3.2			0.9			1.2			2.0			0.5
Liabilities settled during the period		(6.8	)		(9.2	)		(2.5	)		(4.1	)		(2.5	)		(2.0	)
Accretion		21.5			21.1			4.5			5.9			16.5			14.7
Revisions in estimated cash flows		33.9			(13.8	)		(2.4	)		(35.8	)		36.3			22.7
Asset retirement obligations, end of year	$	577.4		$	520.9		$	111.1		$	110.6		$	451.0		$	398.7

NATURAL GAS AND PROPANE GAS – For Spire Missouri’s eastern region, inventory of natural gas in storage is priced on a last in, first out (LIFO) basis and inventory of propane gas in storage is priced on a first in, first out (FIFO) basis. For the rest of the Gas Utility segment, inventory of natural gas in storage is priced on the weighted average cost basis. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2023 was less than the LIFO cost by $21.1. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2022 was more than the LIFO cost by $37.3. The carrying value of the Utilities’ inventory is never adjusted to a lower net realizable value or market value because, pursuant to Purchased Gas Adjustment (PGA) clauses or a Gas Supply Adjustment (GSA) rider, actual gas costs are recovered in customer rates. Natural gas and propane gas storage inventory in Spire’s other operating segments is recorded at the lower of average cost or net realizable value.

BUSINESS COMBINATIONS AND GOODWILL – Spire’s acquisitions were accounted for using business combination accounting. Under this method, the purchase price paid by the acquirer is allocated to the assets acquired and liabilities assumed as of the acquisition date based on their fair value. Goodwill is measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. At September 30, 2023, goodwill included in Spire’s Gas Utility, Gas Marketing, and Midstream segments was $210.2, zero, and zero, respectively, with the remainder held at the corporate level. Goodwill amounts have not changed since fiscal 2017, and there are no accumulated impairment losses. Spire and Spire Missouri evaluate goodwill for impairment as of July 1 of each year, or more frequently if events and circumstances indicate that goodwill might be impaired. At each test date, the assessments concluded that goodwill was not impaired. The Company updated the assessments as of September 30, 2023, determining that it remained more likely than not that the fair value of each reporting unit exceeded its carrying value.

A subsidiary of Spire in the Midstream segment acquired a natural gas storage facility in northern Oklahoma, now named Spire Storage Salt Plains LLC, on April 1, 2023. The $37 purchase price was fully allocated to the assets acquired and liabilities assumed based on their fair value at the acquisition date, consisting almost entirely of base gas and other property, plant and equipment, resulting in no goodwill.

IMPAIRMENT OF LONG-LIVED ASSETS – Long-lived assets classified as held and used are evaluated for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. Whether impairment has occurred is determined by comparing the estimated undiscounted cash flows attributable to the assets with the carrying value of the assets. If the carrying value exceeds the undiscounted cash flows, the Company recognizes an impairment charge equal to the amount of the carrying value that exceeds the estimated fair value of the assets. In the period in which the Company determines an asset meets held-for-sale criteria, an impairment charge is recorded to the extent the book value exceeds its fair value less cost to sell.

70

 

DERIVATIVES – In the course of their business, certain subsidiaries of Spire enter into commitments associated with the purchase or sale of natural gas. Certain of their derivative natural gas contracts are designated as normal purchases or normal sales and, as such, are excluded from the scope of FASB ASC Topic 815, Derivatives and Hedging. Those contracts are accounted for as executory contracts and recorded on an accrual basis. Revenues and expenses from such contracts are recorded gross. Contracts not designated as normal purchases or normal sales are recorded as derivatives with changes in fair value recognized in earnings in the periods prior to physical delivery. Certain of Spire Marketing’s wholesale purchase and sale transactions are classified as trading activities for financial reporting purposes, with income and expenses presented on a net basis in natural gas expenses in the Consolidated Statements of Income. Spire also enters into cash flow hedges through execution of interest rate swap contracts to protect itself against adverse movements in interest rates. Refer to Note 10, Derivative Instruments and Hedging Activities, for more information about derivatives.

INCOME TAXES – Spire and its subsidiaries account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and the respective tax basis and for tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be realized or settled. The effects on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income or loss for non-regulated operations, and in a regulatory asset or regulatory liability for regulated operations. A valuation allowance is established when it is more likely than not that some portion or all of the deferred tax assets will not be realized.

The Company accounts for uncertain tax positions in accordance with authoritative guidance. The authoritative guidance addresses the determination of whether tax benefits claimed, or expected to be claimed, on a tax return should be recorded in the financial statements. Spire may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the position will be sustained upon examination by the taxing authority, based on the technical merits of the position. Tax-related interest and penalties, if any, are classified as a liability on the balance sheets. For additional information on the accounting for income taxes, refer to Note 12, Income Taxes.

CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – All highly liquid debt instruments purchased with original maturities of three months or less are considered to be cash equivalents. Such instruments are carried at cost, which approximates market value. Outstanding checks on the Company’s and Utilities’ bank accounts in excess of funds on deposit create book overdrafts (which are funded at the time checks are presented for payment) and are classified as Other in the Current Liabilities section of the balance sheets. Changes in book overdrafts are reflected as Operating Activities in the statements of cash flows. In Spire’s statements of cash flows, total Cash, Cash Equivalents, and Restricted Cash included $20.2 and $14.0 of restricted cash reported in “Other Investments” on the Company’s balance sheet as of September 30, 2023 and 2022, respectively (in addition to amounts shown as “Cash and cash equivalents”). This restricted cash has been segregated and invested in debt securities in a trust account based on collateral requirements for reinsurance at Spire’s risk management company.

NATURAL GAS RECEIVABLE – Spire Marketing enters into natural gas transactions with natural gas pipeline and storage companies known as park and loan arrangements. Under the terms of the arrangements, Spire Marketing purchases natural gas from a third party and delivers that natural gas to the pipeline or storage company for the right to receive the same quantity of natural gas from that company at the same location in a future period. These arrangements are accounted for as non-monetary transactions under GAAP and are recorded at the carrying amount. As such, natural gas receivables are reflected in “Other” current assets on the Consolidated Balance Sheets at cost, which includes related fees associated with the transactions. In the period that the natural gas is returned to Spire Marketing, concurrent with the sale of the natural gas to a third party, the related natural gas receivable is expensed in the Consolidated Statements of Income. In conjunction with these transactions, Spire Marketing usually enters into New York Mercantile Exchange (NYMEX) and Intercontinental Exchange (ICE) natural gas futures, options, and swap contracts or fixed price sales agreements to protect against market changes in future sales prices.

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EARNINGS PER COMMON SHARE – GAAP requires dual presentation of basic and diluted earnings per share (EPS). EPS is computed using the two-class method, which is an earnings allocation method for computing EPS that treats a participating security as having rights to earnings that would otherwise have been available to common shareholders. Certain of the Company’s stock-based compensation awards pay non-forfeitable dividends to the participants during the vesting period and, as such, are deemed participating securities. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding that are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common shares, pursuant to the treasury stock method. Shares attributable to equity units, non-participating performance-contingent restricted stock awards, and time-vested restricted stock/units are excluded from the calculation of diluted earnings per share if the effect would be antidilutive. Shares attributable to non-participating performance-contingent restricted stock awards are only included in the calculation of diluted earnings per share to the extent the underlying performance and/or market conditions are satisfied (a) prior to the end of the reporting period or (b) would be satisfied if the end of the reporting period were the end of the related contingency period and the result would be dilutive. The Company’s EPS computations are presented in Note 4, Earnings Per Common Share.

TRANSACTIONS WITH AFFILIATES – Transactions between affiliates of the Company have been eliminated from the consolidated financial statements of Spire. Spire Missouri and Spire Alabama borrowed funds from the Company and incurred related interest, as reflected in their separate financial statements, and they participated in normal intercompany shared services transactions. In addition, Spire Missouri’s and Spire Alabama’s other transactions with affiliates included: 

	Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021
Natural gas purchases from Spire Marketing	$	57.4	$	86.3	$	92.5	$	4.7	$	3.2	$	10.4
Natural gas sales to Spire Marketing		0.4		—		1.1		—		0.5		0.1
Transportation services from Spire STL Pipeline LLC		32.0		32.0		32.0		—		—		—
Natural gas storage services from Spire Storage Salt Plains LLC		0.7		—		—		—		—		—
Transportation services from Spire NGL Inc.		—		—		0.5		—		—		—

ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES – Trade accounts receivable are recorded at the amounts due from customers, including unbilled amounts. Accounts receivable are written off when they are deemed to be uncollectible. An allowance for expected credit losses is estimated and updated based on relevant data and trends such as accounts receivable aging, historical write-off experience, current write-off trends, economic conditions, and the impact of weather and availability of customer payment assistance on collection trends. For the Utilities, net write-offs as a percentage of revenue has historically been the best predictor of base net write-off experience over time. Management judgment is applied in the development of the allowance due to the complexity of variables and subjective nature of certain relevant factors. The accounts receivable of Spire’s non-utility businesses are evaluated separately from those of the Utilities. The allowance for credit losses for those other businesses is based on a continuous evaluation of the individual counterparty risk and is not significant for the periods presented. Activity in the allowance for credit losses is shown in the following table.

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Allowance at beginning of year	$	31.9		$	30.3		$	24.9		$	24.9		$	22.6		$	18.1		$	6.3		$	6.6		$	5.5
Provision for expected credit losses		16.6			11.6			14.7			13.3			11.2			11.1			2.6			0.3			3.1
Write-offs, net of recoveries		(16.0	)		(10.0	)		(9.3	)		(12.0	)		(8.9	)		(6.6	)		(3.2	)		(0.6	)		(2.0	)
Allowance at end of year	$	32.5		$	31.9		$	30.3		$	26.2		$	24.9		$	22.6		$	5.7		$	6.3		$	6.6

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FINANCE RECEIVABLES – Spire Alabama finances third party contractor sales of merchandise including gas furnaces and appliances. At September 30, 2023 and 2022, Spire Alabama’s finance receivable totaled approximately $6.7 and $7.1, respectively. Financing is available only to qualified customers who meet creditworthiness thresholds for customer payment history and external agency credit reports. Spire Alabama relies upon ongoing payments as the primary indicator of credit quality during the term of each contract. The allowance for credit losses is recognized using an estimate of write-off percentages based on historical experience. Delinquent accounts are evaluated on a case-by-case basis and, absent evidence of debt repayment, after 90 days are due in full and assigned to a third-party collection agency. The remaining finance receivable is written off approximately 12 months after being assigned to the third-party collection agency. Spire Alabama had finance receivables past due 90 days or more of $0.3 at September 30, 2023 and 2022.

GROUP MEDICAL AND WORKERS’ COMPENSATION RESERVES – The Company self-insures its group medical and workers’ compensation costs and carries stop-loss coverage in relation to medical claims and workers’ compensation claims. Reserves for amounts incurred but not reported are established based on historical cost levels and lags between occurrences and reporting.

FAIR VALUE MEASUREMENTS – Certain assets and liabilities are recognized or disclosed at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). GAAP establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.

The levels of the hierarchy are described below:

• Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.

• Level 2 – Pricing inputs other than quoted prices included within Level 1, which are either directly or indirectly observable for the asset or liability as of the reporting date. These inputs are derived principally from, or corroborated by, observable market data.

• Level 3 – Pricing that is based upon inputs that are generally unobservable that are based on the best information available and reflect management’s assumptions about how market participants would price the asset or liability.

Assessment of the significance of a particular input to the fair value measurements may require judgment and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. Additional information about fair value measurements is provided in Note 8, Fair Value of Financial Instruments, Note 9, Fair Value Measurements, and Note 13, Pension Plans and Other Postretirement Benefits.

STOCK-BASED COMPENSATION – The Company accounts for share-based compensation arrangements in accordance with ASC Topic 718, Compensation - Stock Compensation. The Company measures stock-based compensation awards at fair value at the date of grant and recognizes the compensation cost of the awards over the requisite service period. Forfeitures are recognized in the period they occur. Refer to Note 3, Stock-Based Compensation, for further discussion of the accounting for the Company’s stock-based compensation plans.

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2. REVENUE

The following tables show revenue disaggregated by source and customer type.

	2023			2022			2021
Spire
Gas Utility:
Residential	$	1,648.5		$	1,416.6		$	1,234.0
Commercial & industrial		606.0			338.9			586.0
Transportation		121.6			118.0			122.9
Off-system & other incentive		30.0			42.0			152.7
Other customer revenue		16.1			19.9			22.2
Total revenue from contracts with customers		2,422.2			1,935.4			2,117.8
Changes in accrued revenue under alternative revenue programs		34.7			10.7			1.5
Total Gas Utility operating revenues		2,456.9			1,946.1			2,119.3
Gas Marketing		179.1			234.9			96.5
Midstream		66.1			53.1			52.6
Other		16.7			16.1			15.1
Total before eliminations		2,718.8			2,250.2			2,283.5
Intersegment eliminations (see Note 14, Information by Operating Segment)		(52.5	)		(51.7	)		(48.0	)
Total Operating Revenues	$	2,666.3		$	2,198.5		$	2,235.5
Spire Missouri
Residential	$	1,261.3		$	1,061.4		$	882.1
Commercial & industrial		411.9			177.2			436.1
Transportation		33.2			33.3			33.5
Off-system & other incentive		20.1			25.2			145.6
Other customer revenue		12.5			11.1			16.3
Total revenue from contracts with customers		1,739.0			1,308.2			1,513.6
Changes in accrued revenue under alternative revenue programs		23.9			12.8			3.0
Total Operating Revenues	$	1,762.9		$	1,321.0		$	1,516.6
Spire Alabama
Residential	$	322.9		$	291.6		$	288.0
Commercial & industrial		150.4			119.1			114.9
Transportation		77.6			74.4			78.7
Off-system & other incentive		9.9			16.8			7.1
Other customer revenue		3.6			5.5			1.9
Total revenue from contracts with customers		564.4			507.4			490.6
Changes in accrued revenue under alternative revenue programs		6.7			1.7			3.4
Total Operating Revenues	$	571.1		$	509.1		$	494.0

The Utilities sell natural gas to residential and other customers. The sale of natural gas is governed by the various state utility commissions, which set rates, charges, and terms and conditions of service, collectively included in a “tariff.” The performance obligation, which relates to the promise to provide natural gas, is satisfied over time as the customer simultaneously receives and consumes the natural gas, and revenue is recognized accordingly.

The Utilities’ transportation revenue relates to the promise to transport the specified quantities of natural gas at tariff rates. This performance obligation is satisfied over time as the gas is transported, and revenue is recognized as invoiced monthly.

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The Utilities have alternative revenue programs (ARPs), which represent an agreement between the utility and its regulator, currently consisting of decoupling mechanisms (also known as weather normalization adjustments) and incentive programs (primarily Alabama’s Cost Control Measure). When the criteria to recognize additional (or reduced) revenue from ARPs have been met, the Utilities establish a regulatory asset (or liability). When amounts previously recognized for ARPs are billed, the Utilities reduce the regulatory asset (or liability) and increase (or decrease) accounts receivable. Billed amounts, which are part of the overall tariff paid by customers, are included in revenue from contracts with customers, while the change in the related regulatory asset or liability is presented as revenue from ARPs. Depending on whether the beginning accrued ARP balance was a regulatory asset or liability and depending on the size and direction of the current period accrual, the amount presented as revenue from ARPs could be negative.

The Utilities read meters and bill customers on monthly cycles. Spire Missouri, Spire Gulf and Spire Mississippi record their gas utility revenues from gas sales and transportation services on an accrual basis that includes estimated amounts for gas delivered but not yet billed. The accruals for unbilled revenues are reversed in the subsequent accounting period when meters are actually read and customers are billed. Spire Alabama records natural gas distribution revenues in accordance with the tariff established by the APSC. Unbilled revenue is accrued in an amount equal to the related gas cost, as profit margin is not considered earned until billed. Spire’s other subsidiaries, including Spire Marketing, record revenues when earned, as the product is delivered or as services are performed.

Gas Marketing’s contracts are derivatives. Wholesale contracts (with producers, municipalities, and utility companies) are subject to derivative accounting. Retail contracts (with large commercial and industrial customers) are designated as “normal purchase, normal sale” arrangements and are therefore accounted for as revenue from contracts with customers. The performance obligation is satisfied over time by the transfer of control of natural gas to the customer, and revenue is recognized as invoiced monthly.

Payments are generally required within 30 days of billing, and contracts generally do not have a significant financing component. Spire’s revenues are not subject to significant returns, refunds, or warranty obligations.

Spire, Spire Missouri, and Spire Alabama have elected to apply a “right to invoice” practical expedient, recognizing revenue for volumes delivered for which they have a right to invoice, as long as that amount corresponds with the value to the customer. Disclosures about remaining performance obligations are not required because either contracts have an original expected duration of one year or less, or revenue is recognized under the right to invoice practical expedient, or both.

Sales taxes imposed on applicable Spire Alabama and Spire Missouri sales are billed to customers. These amounts are not recorded in the statements of income but are recorded as tax collections payable and included in the “Other” line of the Current Liabilities section of the balance sheets.

Gross receipts taxes associated with the Company’s natural gas utility services are imposed on the Company, Spire Missouri, and Spire Alabama and billed to its customers. The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.”

	2023		2022		2021
Spire	$	131.8	$	109.8	$	94.0
Spire Missouri		96.7		79.6		64.3
Spire Alabama		29.9		25.5		25.1

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3. STOCK-BASED COMPENSATION

The Spire 2015 Equity Incentive Plan (EIP) was approved by shareholders of Spire on January 29, 2015 and amended on November 9, 2018. The purpose of the EIP is to encourage directors, officers, and key employees of the Company and its subsidiaries to contribute to the Company’s success and align their interests with that of shareholders. To accomplish this purpose, the Compensation and Human Resources Committee (“Committee”) of Spire’s Board of Directors (the “Board”) may grant awards under the EIP that may be earned by achieving performance objectives and/or other criteria as determined by the Committee. Under the terms of the EIP, officers and employees of the Company and its subsidiaries, as determined by the Committee, are eligible to be selected for awards. The EIP provides for restricted stock, restricted stock units, qualified and non-qualified stock options, stock appreciation rights, and performance shares payable in stock, cash, or a combination of both. The EIP generally provides a minimum vesting period of at least three years for each type of award, with pro rata vesting permitted during the minimum three-year vesting period. The maximum number of shares reserved for issuance under the EIP is 1,000,000.

The Company allows participants in the EIP the ability to defer a portion or all of their award. As of  September 30, 2023, a total of 244,618 share equivalents (at target payout) have been deferred by participants. Such units are included in the data presented below. After the required holding period, deferred awards are ultimately paid in cash rather than in shares of stock. Upon vesting, the Company issues new shares to satisfy awards that are not deferred.

Restricted Stock Awards

During fiscal 2023, the Company granted116,390 performance-contingent restricted share units to executive officers and key employees at a weighted average grant date fair value of $79.88 per share. This number represents the target shares that can be earned pursuant to the terms of the awards. The share units have a performance period ending September 30, 2026. While the participants have no interim voting rights on these share units, dividends accrue during the performance period and are paid to the participants upon vesting but are subject to forfeiture if the underlying share units do not vest.

The number of share units that will ultimately vest is dependent upon the attainment of certain levels of earnings, as well as the Company’s level of total shareholder return (TSR) during the performance period relative to a comparator group of peer companies. This TSR provision is considered a market condition under GAAP and is discussed further below. The maximum amount of shares or share equivalents that can be earned pursuant to the terms of the awards is 200% of the target units granted.

The weighted average grant date fair value of performance-contingent restricted share units granted during fiscal years 2022 and 2021 was $67.43 and $68.69 per share, respectively.

Fiscal 2023 activity of restricted stock units subject to performance and/or market conditions is presented below:

				Weighted
				Average
				Grant Date
				Fair Value
	Units			Per Unit
Non-vested at September 30, 2022		343,524		$	70.14
Granted		116,390		$	79.88
Adjusted for performance		(13,459	)	$	76.91
Vested		(74,556	)	$	76.91
Forfeited		(23,546	)	$	71.73
Non-vested at September 30, 2023		348,353		$	71.76

For the year ended September 30, 2023, the total number of shares or share equivalents that could be issued if all outstanding award grants attain maximum performance payout is 696,706.

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During fiscal 2023, the Company granted 55,524 shares of time-vested restricted stock to executive officers and key employees at a weighted average grant date fair value of $71.91 per share. Unless forfeited based on terms of the agreements, these shares will vest in fiscal 2025. In the interim, participants receive full voting rights and dividends, which are not subject to forfeiture. The weighted average grant date fair value of time-vested restricted stock and restricted stock units awarded to employees during fiscal years 2022 and 2021 was $63.57 and $64.29 per share, respectively.

During fiscal 2023, the Company granted 12,720 shares of time-vested restricted stock to non-employee directors at a weighted average grant date fair value of $75.59 per share. These shares vested in fiscal 2023, six months after the grant date. The weighted average grant date fair value of restricted stock awarded to non-employee directors during fiscal years 2022 and 2021 was $66.31 and $62.35 per share, respectively.

Time-vested restricted stock and stock unit activity for fiscal 2023 is presented below:

				Weighted
				Average
				Grant Date
	Shares/			Fair Value
	Units			Per Share
Non-vested at September 30, 2022		122,245		$	66.60
Granted		68,244		$	72.60
Vested		(59,040	)	$	75.27
Forfeited		(8,460	)	$	65.36
Non-vested at September 30, 2023		122,989		$	65.85

For restricted stock and stock units (performance-contingent and time-vested) that vested during fiscal years 2023, 2022, and 2021, the Company withheld 18,428 shares, 28,055 shares, and 16,787 shares, respectively, at weighted average prices of $72.03, $63.97 and $65.99 per share, respectively, pursuant to elections by employees to satisfy tax withholding obligations. The total fair value of restricted stock (performance-contingent and time-vested) that vested during fiscal years 2023, 2022, and 2021 was $8.6, $10.1, and $6.5, respectively, and the related tax benefit was $3.2, $3.8, and $2.5, respectively. None of the tax benefits have been realized.

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Equity Compensation Costs

Compensation cost for performance-contingent restricted stock and stock unit awards is based upon the probable outcome of the performance conditions. For shares or units that do not vest or that are not expected to vest due to the outcome of the performance conditions (excluding market conditions), no compensation cost is recognized and any previously recognized compensation cost is reversed.

The fair value of awards of performance-contingent and time-vested restricted stock and restricted stock units, not subject to the TSR provision, are estimated using the closing price of the Company’s stock on the grant date. For those awards that do not pay dividends during the vesting period, the estimate of fair value is reduced by the present value of the dividends expected to be paid on the Company’s common stock during the performance period, discounted using an appropriate U.S. Treasury yield. For shares subject to the TSR provision, the estimated impact of this market condition is reflected in the grant date fair value per share of the awards. Accordingly, compensation cost is not reversed to reflect any actual reductions in the awards that may result from the TSR provision. However, if the Company’s TSR during the performance period ranks below the level specified in the award agreements, relative to a comparator group of companies, and the Committee elects not to reduce the award (or reduce by a lesser amount), this election would be accounted for as a modification of the original award and additional compensation cost would be recognized at that time. The grant date fair value of the awards subject to the TSR provision awarded during fiscal years 2023, 2022 and 2021 was valued by a Monte Carlo simulation model that assessed the probabilities of various TSR outcomes. The significant assumptions used in the Monte Carlo simulations are as follows:

	2023		2022		2021
Risk-free interest rate		4.26%		0.79%		0.22%
Expected dividend yield of stock		—		—		—
Expected volatility of stock		33.8%		32.2%		31.4%
Performance period (in years)		3.0		3.0		3.0

The risk-free interest rate was based on the yield on U.S. Treasury securities matching the vesting period. A zero-percent dividend yield was used, which is mathematically equivalent to the assumption that dividends are reinvested as they are paid. The expected volatility is based on the historical volatility of the Company’s stock. Volatility assumptions were also made for each of the companies included in the comparator group. The vesting period is equal to the performance period set forth in the terms of the award.

The amounts of compensation cost recognized for share-based compensation arrangements are presented below:

	2023			2022			2021
Total compensation cost	$	11.2		$	7.5		$	16.6
Compensation cost capitalized		(1.4	)		(1.1	)		(2.7	)
Compensation cost recognized in net income		9.8			6.4			13.9
Income tax benefit recognized in net income		(2.2	)		(1.5	)		(3.2	)
Compensation cost recognized in net income, net of income tax	$	7.6		$	4.9		$	10.7

As of September 30, 2023, there was $12.1 of total unrecognized compensation cost related to non-vested share-based compensation arrangements, which is expected to be recognized over a weighted average period of 1.7 years.

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4. EARNINGS PER COMMON SHARE

		2023		2022		2021
Basic Earnings Per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Basic Earnings Per Share of Common Stock		$	3.86	$	3.96	$	4.97
Diluted Earnings per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)*			0.1		0.1		0.1
Weighted Average Diluted Common Shares (in millions)			52.6		52.1		51.7
Diluted Earnings Per Share of Common Stock		$	3.85	$	3.95	$	4.96
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to common stock forward contracts, stock units subject to performance or market conditions, and restricted stock, which could have a dilutive effect in the future			1.9		0.1		0.1

5. SHAREHOLDERS’ EQUITY

Spire

Preferred Stock

At September 30, 2023 and 2022, Spire had authorized 5,000,000 shares of preferred stock.

On May 21, 2019, Spire completed the public offering of 10,000,000 depositary shares (the “Depositary Shares”), each representing a 1/1,000th interest in a share of the Company’s 5.90% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $25.00 per share, with a liquidation preference of $25,000 per share (the “Preferred Stock”). The transaction resulted in $242.0 of net proceeds, after deducting commissions and sale expenses, which proceeds were used to (i) refinance long-term and short-term Spire debt and (ii) fund capital expenditures at both the Utilities and Spire’s gas-related businesses.

Dividends on the Preferred Stock, when declared by the Board, are payable on the liquidation preference amount, on a cumulative basis, quarterly in arrears on the 15th day of February, May, August and November of each year, beginning on August 15, 2019. Dividends are payable out of amounts legally available for the payment of dividends at an annual rate equal to 5.90% of the liquidation preference per share of Preferred Stock (equivalent to $25.00 per Depositary Share). Dividends accumulate daily and are cumulative from May 21, 2019.

Under the terms of the Preferred Stock, the Company’s ability to declare or pay dividends on, or purchase or redeem, shares of its common stock or any class or series of capital stock of the Company that rank junior to the Preferred Stock are subject to certain restrictions in the event that the Company does not declare and pay the full cumulative dividends on the Preferred Stock through the most recently completed quarterly dividend period.

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Spire may, at its option, redeem the Preferred Stock (i) in whole, but not in part, at any time prior to August 15, 2024, within 120 days after a ratings event where a rating agency amends, clarifies or changes the criteria it uses to assign equity credit for securities such as the Preferred Stock, at a redemption price in cash equal to $25,500 per share, or (ii) in whole or in part, from time to time, on or after August 15, 2024, at a redemption price in cash equal to $25,000 per share, plus, in each case, all accumulated and unpaid dividends (whether declared or not) up to such redemption date.

Shareholders of the Preferred Stock generally have no voting rights with respect to matters that generally require the approval of voting stockholders. The limited voting rights of holders of the Preferred Stock include the right to vote on certain matters that may affect the preference or special rights of the Preferred Stock. In addition, if and whenever dividends on any shares of Preferred Stock have not been declared and paid for at least six dividend periods, whether or not consecutive, the number of directors then constituting the Board shall automatically be increased by two (to be elected by the holders of the Preferred Stock) until all accumulated and unpaid dividends on the Preferred Stock have been paid in full.

Equity Units

In February 2021, Spire issued 3.5 million equity units, initially in the form of Corporate Units, for an aggregate stated amount of $175.0, resulting in net proceeds (after underwriting fees and other issuance costs) of $169.3. Each “Corporate Unit” has a stated amount of fifty dollars and consists of (i) a stock purchase contract and (ii) a 1/20, or 5%, undivided beneficial ownership interest in one thousand dollars principal amount of Spire’s 2021 Series A 0.75% Remarketable Senior Notes due March 1, 2026 (RSNs). The RSNs are pledged as collateral to secure the holder’s obligation under the related stock purchase contracts. Each stock purchase contract obligates the holder to purchase, and Spire to issue and deliver, on March 1, 2024, for a price of fifty dollars in cash, a variable number of shares of its common stock as follows (subject to anti-dilution adjustments).

If the applicable market value* per share	Number of shares to be purchased per
of Spire common stock is:	stock purchase contract is:
Equal to or greater than $78.6906 (“threshold appreciation price”)	0.6354 (“minimum settlement rate”)
Less than $78.6906, but greater than $64.24	$50.00 ÷ applicable market value*
Less than or equal to $64.24 (“reference price”)	0.7783 (“maximum settlement rate”)

*Based on the volume-weighted average price of Spire common stock during the 20 trading days before settlement.

If a holder elects to settle purchase contracts early, the holder would pay fifty dollars per unit and receive 0.6354 shares per unit.

The Company makes quarterly interest payments on the RSNs at the rate of 0.75% per year and quarterly contract adjustment payments on the stock purchase contracts at the rate of 6.75%. The RSNs and the contract adjustment payments are structurally subordinated to all liabilities of Spire’s subsidiaries.

At issuance, the Company recorded the $35.0 present value of the stock purchase contract payments as a liability (reflected in “Other” current and noncurrent liabilities on the balance sheet) offset by a charge to additional paid-in capital in equity. This noncash financing activity has been excluded from the statement of cash flows. Interest payments on the RSNs are recorded as interest expense and stock purchase contract payments are charged against the liability. Accretion of the stock purchase contract liability is recorded as imputed interest expense. In calculating diluted EPS, the Company applies the treasury stock method to the Corporate Units. These securities have not had an effect on diluted EPS.

In order to secure funds necessary for the holders to pay the purchase price of the common stock on the purchase contract settlement date, the remarketing agent will remarket the RSNs on behalf of the current holders to new third-party investors. Following any successful remarketing of the RSNs, the interest rate on the RSNs will be reset, interest will be payable on a semi-annual basis, and Spire will cease to have the option to redeem the RSNs, other than in connection with the occurrence or continuance of certain special events.

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ATM Program

On February 6, 2019, Spire entered into an “at-the-market” (ATM) equity distribution agreement, supplemented as of  May 14, 2019, pursuant to which the Company  may offer and sell, from time to time, shares of its common stock (including shares of common stock that  may be sold pursuant to forward sale agreements entered into in connection with the ATM equity distribution agreement). On  April 28, 2022, Spire's board approved a new authorization for the sale of additional shares with an aggregate offering price of up to $200.0 through  May 2025.

Settled sales under this ATM program are included in “Common stock issued” in the Condensed Consolidated Statements of Shareholders’ Equity. Also, in the second and third quarters of fiscal 2023, Spire executed forward sale agreements for 228,690 shares and 2,087,231 shares, respectively, of its common stock. On September 27, 2023, 571,372 of these shares were settled, generating $38.5 of net proceeds. The third quarter forward sales included a block sale of 1,744,549 shares which must be settled on or before  December 28, 2023. Had all shares under this forward agreement been settled as of  September 30, 2023, it would have generated net proceeds of $111.2.

As of  September 30, 2023, under the ATM program, Spire  may sell additional shares with an aggregate offering price of up to $17.9.

Other Equity Information

Spire has a shelf registration statement on Form S-3 on file with the U.S. Securities and Exchange Commission (SEC) for the issuance and sale of up to 250,000 shares of common stock under its Dividend Reinvestment and Direct Stock Purchase Plan. There were 244,182 and 237,891 shares at September 30, 2023 and November 10, 2023, respectively, remaining available for issuance under this Form S-3. Spire also has a universal shelf registration statement on Form S-3 on file with the SEC for the issuance of various equity and debt securities, which expires on May 9, 2025.

Spire Missouri

Substantially all of Spire Missouri’s plant is subject to the liens of its first mortgage bonds. The mortgage contains several restrictions on Spire Missouri’s ability to pay cash dividends on its common stock or to make loans to its parent company. These mortgage restrictions are applicable regardless of whether the stock is publicly held or held solely by Spire Missouri’s parent company. Under the most restrictive of these provisions, no cash dividend may be declared or paid if, after the dividend, the aggregate net amount spent for all dividends after September 30, 1953 would exceed a maximum amount determined by a formula set out in the mortgage. Under that formula, the maximum amount is the sum of $8.0 plus earnings applicable to common stock (adjusted for stock repurchases and issuances) for the period from September 30, 1953 to the last day of the quarter before the declaration or payment date for the dividends. As of September 30, 2023 and 2022, the amount under the mortgage’s formula that was available to pay dividends was $1,678.5 and $1,579.4, respectively. Thus, all of Spire Missouri’s retained earnings were free from such dividend restrictions as of those dates.

Spire Missouri has a universal shelf registration statement on Form S-3 on file with the SEC for the issuance of various equity and debt securities, which expires on May 9, 2025. Effective March 5, 2022, Spire Missouri was authorized by the MoPSC to issue conventional term loans, first mortgage bonds, unsecured debt, preferred stock and common stock in an aggregate amount of up to $800.0 for financings placed any time before December 31, 2024. Under this authorization through  September 30, 2023, Spire Missouri has issued $79.1 of common stock and $400.0 of first mortgage bonds.

At September 30, 2023 and 2022, Spire Missouri had authorized 1,480,000 shares of preferred stock, but none were issued and outstanding.

Spire Alabama

At September 30, 2023 and 2022, Spire Alabama had authorized 120,000 shares of preferred stock, but none were issued and outstanding.

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Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income (AOCI), net of income taxes, recognized in the balance sheets at September 30 were as follows:

	Net		Defined Benefit			Net Unrealized
	Unrealized		Pension and			Gain (Loss) on
	Gain (Loss)		Other			Available-for-
	on Cash Flow		Postretirement			Sale Debt
	Hedges		Benefit Plans			Securities			Total
Spire
Balance at September 30, 2021	$	7.9	$	(4.2	)	$	(0.1	)	$	3.6
Other comprehensive income (loss)		42.5		1.5			(0.4	)		43.6
Balance at September 30, 2022		50.4		(2.7	)		(0.5	)		47.2
Other comprehensive income		0.1		0.2			0.1			0.4
Balance at September 30, 2023	$	50.5	$	(2.5	)	$	(0.4	)	$	47.6
Spire Missouri
Balance at September 30, 2021	$	—	$	(4.2	)	$	—		$	(4.2	)
Other comprehensive income		—		1.5			—			1.5
Balance at September 30, 2022		—		(2.7	)		—			(2.7	)
Other comprehensive income		—		0.2			—			0.2
Balance at September 30, 2023	$	—	$	(2.5	)	$	—		$	(2.5	)

Income tax expense (benefit) recorded for items of other comprehensive income (loss) reported in the statements of comprehensive income is calculated by applying statutory federal, state, and local income tax rates applicable to ordinary income. The tax rates applied to individual items of other comprehensive income (loss) are similar within each reporting period. For the periods presented, Spire Alabama had no AOCI balances.

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6. LONG-TERM DEBT

The composition of long-term debt as of September 30 is shown in the following tables.

	2023			2022
Spire
3.31% Notes Payable, due December 15, 2022	$	—		$	25.0
3.54% Senior Notes, due February 27, 2024		150.0			150.0
0.75% Remarketable Senior Notes, due March 1, 2026		175.0			175.0
3.13% Senior Notes, due September 1, 2026		130.0			130.0
3.93% Senior Notes, due March 15, 2027		100.0			100.0
5.80% Senior Notes, due March 15, 2033		150.0			—
4.70% Senior Notes, due August 15, 2044		250.0			250.0
Total principal of Spire Missouri long-term debt (see below)		1,798.0			1,648.0
Total principal of Spire Alabama long-term debt (see below)		750.0			575.0
Other subsidiaries' long-term debt:
5.00% First Mortgage Bonds, due September 30, 2031		42.0			42.0
2.95% Notes, with annual principal payments through December 2034		117.7			123.9
5.61% First Mortgage Bonds, due October 15, 2037		30.0			—
3.52% First Mortgage Bonds, due September 30, 2049		40.0			40.0
Total principal of long-term debt		3,732.7			3,258.9
Less: Unamortized discounts and debt issuance costs		(22.1	)		(19.2	)
Less: Current portion		(156.6	)		(281.2	)
Long-term debt, excluding current portion	$	3,554.0		$	2,958.5
Spire Missouri
First Mortgage Bonds:
3.40% Series, due August 15, 2023	$	—		$	250.0
Floating Rate Series, due December 2, 2024		300.0			300.0
3.40% Series, due March 15, 2028		45.0			45.0
7.00% Series, due June 1, 2029	19.3			19.3
2.84% Series, due November 15, 2029		275.0			275.0
7.90% Series, due September 15, 2030		30.0			30.0
3.68% Series, due September 15, 2032		50.0			50.0
4.80% Series, due February 15, 2033		400.0			—
6.00% Series, due May 1, 2034		99.3			99.3
6.15% Series, due June 1, 2036		54.5			54.5
4.63% Series, due August 15, 2043		99.9			99.9
4.23% Series, due September 15, 2047		70.0			70.0
3.30% Series, due June 1, 2051		305.0			305.0
4.38% Series, due September 15, 2057		50.0			50.0
Total principal of Spire Missouri long-term debt		1,798.0			1,648.0
Less: Unamortized discounts and debt issuance costs		(12.6	)		(10.3	)
Less: Current portion		—			(250.0	)
Spire Missouri long-term debt, excluding current portion	$	1,785.4		$	1,387.7
Spire Alabama
3.21% Notes, due September 15, 2025	$	35.0		$	35.0
5.32% Notes, due October 15, 2029		90.0			—
2.88% Notes, due December 1, 2029		100.0			100.0
2.04% Notes, due December 15, 2030		150.0			150.0
5.41% Notes, due October 15, 2032		85.0			—
5.90% Notes, due January 15, 2037		45.0			45.0
4.31% Notes, due December 1, 2045		80.0			80.0
3.92% Notes, due January 15, 2048		45.0			45.0
4.64% Notes, due January 15, 2049		90.0			90.0
4.02% Notes, due January 15, 2058		30.0			30.0
Total principal of Spire Alabama long-term debt		750.0			575.0
Less: Unamortized discounts and debt issuance costs		(4.1	)		(3.5	)
Spire Alabama long-term debt, excluding current portion	$	745.9		$	571.5

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Spire Missouri's $300.0 of first mortgage bonds due December 2, 2024 are secured equally with all its other first mortgage bonds. Interest is payable quarterly in arrears at a floating rate based on the compounded secured overnight financing rate plus 50 basis points, with a maximum rate of the lesser of 8% or the maximum rate then permitted by applicable law.

Maturities of long-term debt for Spire on a consolidated basis, Spire Missouri and Spire Alabama for the five fiscal years after September 30, 2023 are as follows:

	2024		2025		2026		2027		2028
Spire	$	156.6	$	342.0	$	312.5	$	108.1	$	53.6
Spire Missouri		—		300.0		—		—		45.0
Spire Alabama		—		35.0		—		—		—

The long-term debt agreements of Spire, Spire Missouri and Spire Alabama contain customary financial covenants and default provisions. As of September 30, 2023, there were no events of default under these financial covenants.

Spire

At September 30, 2023, Spire had outstanding principal of long-term debt totaling $3,732.7, of which $1,798.0 was issued by Spire Missouri, $750.0 was issued by Spire Alabama and $229.7 was issued by other subsidiaries. Except for $300.0 of Spire Missouri floating-rate bonds, all long-term debt bears fixed rates and is subject to changes in fair value as market interest rates change. However, increases and decreases in fair value would impact earnings and cash flows only if the Company were to reacquire any of these issues in the open market prior to maturity. Under GAAP applicable to the Utilities’ regulated operations, losses or gains on early redemption of long-term debt would typically be deferred as regulatory assets or regulatory liabilities and amortized over a future period. Interest expense shown on Spire’s consolidated statement of income is net of capitalized interest totaling $8.6, $4.5 and $4.4 for the years ended September 30, 2023, 2022 and 2021, respectively.

As indicated in Note 5, Shareholders’ Equity, Spire has a shelf registration statement on Form S-3 on file with the SEC for the issuance of equity and debt securities.

Spire Missouri

At September 30, 2023, Spire Missouri had outstanding principal of long-term debt totaling $1,798.0. Except for $300.0 of floating-rate bonds, all long-term debt bears fixed rates and is subject to changes in fair value as market interest rates change. Interest expense shown on Spire Missouri’s statement of comprehensive income is net of capitalized interest totaling $3.1, $0.6 and $0.2 for the years ended September 30, 2023, 2022 and 2021, respectively.

As indicated in Note 5, Shareholders’ Equity, Spire Missouri has a shelf registration on Form S-3 on file with the SEC for issuance of equity and debt securities, which expires on May 9, 2025. Effective March 5, 2022, Spire Missouri was authorized by the MoPSC to issue conventional term loans, first mortgage bonds, unsecured debt, preferred stock and common stock in an aggregate amount of up to $800.0 for financings placed any time before December 31, 2024. Under this authorization through September 30, 2023, Spire Missouri has issued $79.1 of common stock and $400.0 of first mortgage bonds.

Substantially all of Spire Missouri’s plant is subject to the liens of its first mortgage bonds. The mortgage contains several restrictions on Spire Missouri’s ability to pay cash dividends on its common stock, which are described in Note 5, Shareholders’ Equity.

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Spire Alabama

At September 30, 2023, Spire Alabama had outstanding principal of fixed-rate long-term debt totaling $750.0. While these long-term debt issues are fixed-rate, they are subject to changes in fair value as market interest rates change. Interest expense shown on Spire Alabama’s statement of income is net of capitalized interest totaling $2.3, $3.2 and $3.2 for the years ended September 30, 2023, 2022 and 2021, respectively.

Spire Alabama has no standing authority to issue long-term debt and must petition the APSC for each planned issuance.

7. NOTES PAYABLE AND CREDIT AGREEMENTS

Spire, Spire Missouri and Spire Alabama have a syndicated revolving credit facility pursuant to a loan agreement with 12 banks through July 22, 2027. The loan agreement has an aggregate credit commitment of $1,300.0, including sublimits of $450.0 for the Spire holding company, $575.0 for Spire Missouri and $275.0 for Spire Alabama. These sublimits may be reallocated from time to time among the three borrowers within the $1,300.0 aggregate commitment, with commitment fees and interest margins applied for each borrower relative to its credit rating, as well as sustainability rate adjustments based on Spire's DART (“Days Away Restricted or Transferred”) rate and methane emissions reductions. The Spire holding company may use its line to provide for the funding needs of various subsidiaries. The agreement also contains financial covenants limiting each borrower’s consolidated total debt, including short-term debt, to no more than 70% of its total capitalization. As defined in the line of credit, on September 30, 2023, total debt was less than 65% of total capitalization for each borrower. There were no borrowings against this credit facility as of September 30, 2023 and 2022.

Spire has a commercial paper program (“CP Program”) pursuant to which it may issue short-term, unsecured commercial paper notes. Amounts available under the CP Program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount of the notes outstanding under the CP Program at any time not to exceed $1,300.0. The notes may have maturities of up to 365 days from date of issue.

On January 5, 2023, Spire Missouri entered into a loan agreement with several banks for a $250.0 unsecured term loan due October 5, 2023. Interest was based on the secured overnight financing rate (“SOFR”) plus an adjustment of 0.10% per annum plus a margin of 0.80% per annum. The loan was repaid on May 8, 2023.

Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of September 30, 2023, $706.9 of Spire’s short-term borrowings were used to support lending to the Utilities.

	Spire			Spire						Spire
	(Parent Only)			Missouri						Alabama			Spire
	CP			Term			Spire			Spire			Consol-
	Program			Loan			Note			Note			idated
Year Ended September 30, 2023
Highest borrowings outstanding	$	1,282.0		$	250.0		$	656.9		$	274.0		$	1,482.0
Lowest borrowings outstanding		354.4			—			3.8			76.7			489.0
Weighted average borrowings		776.3			66.8			327.9			119.1			843.1
Weighted average interest rate		5.0	%		5.5	%		4.9	%		4.9	%		5.0	%
As of September 30, 2023
Borrowings outstanding	$	955.5		$	—		$	540.6		$	124.1		$	955.5
Weighted average interest rate		5.6	%		0.0	%		5.6	%		5.6	%		5.6	%
As of September 30, 2022
Borrowings outstanding	$	1,037.5		$	—		$	445.3		$	260.9		$	1,037.5
Weighted average interest rate		3.3	%		0.0	%		3.3	%		3.3	%		3.3	%

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8. FAIR VALUE OF FINANCIAL INSTRUMENTS

The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis were as follows:

					Classification of
					Estimated Fair Value
					Quoted
					Prices in		Significant
					Active		Observable
	Carrying		Fair		Markets		Inputs
	Amount		Value		(Level 1)		(Level 2)
Spire
As of September 30, 2023
Cash and cash equivalents	$	5.6	$	5.6	$	5.6	$	—
Notes payable		955.5		955.5		—		955.5
Long-term debt, including current portion		3,710.6		3,270.2		—		3,270.2
As of September 30, 2022
Cash and cash equivalents	$	6.5	$	6.5	$	6.5	$	—
Notes payable		1,037.5		1,037.5		—		1,037.5
Long-term debt, including current portion		3,239.7		2,851.8		—		2,851.8
Spire Missouri
As of September 30, 2023
Cash and cash equivalents	$	0.8	$	0.8	$	0.8	$	—
Notes payable - associated companies		540.6		540.6		—		540.6
Long-term debt		1,785.4		1,592.4		—		1,592.4
As of September 30, 2022
Notes payable - associated companies	$	445.3	$	445.3	$	—	$	445.3
Long-term debt, including current portion		1,637.7		1,473.9		—		1,473.9
Spire Alabama
As of September 30, 2023
Cash and cash equivalents	$	1.2	$	1.2	$	1.2	$	—
Notes payable - associated companies		124.1		124.1		—		124.1
Long-term debt		745.9		648.0		—		648.0
As of September 30, 2022
Cash and cash equivalents	$	2.4	$	2.4	$	2.4	$	—
Notes payable - associated companies		260.9		260.9		—		260.9
Long-term debt		571.5		485.0		—		485.0

86

 

9. FAIR VALUE MEASUREMENTS

The information presented below categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition.

The mutual funds included in Level 1 are valued based on exchange-quoted market prices of individual securities. The mutual funds included in Level 2 are valued based on the closing net asset value per unit.

Derivative instruments included in Level 1 are valued using quoted market prices on the NYMEX or the Intercontinental Exchange (ICE). Derivative instruments classified in Level 2 include physical commodity derivatives and interest rate swaps that are valued using broker or dealer quotation services whose prices are derived principally from, or are corroborated by, observable market inputs. Also included in Level 2 are certain derivative instruments that have values that are similar to, and correlate with, quoted prices for exchange-traded instruments in active markets. Derivative instruments included in Level 3 are valued using generally unobservable inputs that are based upon the best information available and reflect management’s assumptions about how market participants would price the asset or liability. There were no Level 3 balances as of September 30, 2023 or 2022. The Company’s and the Utilities’ policy is to recognize transfers between the levels of the fair value hierarchy, if any, as of the beginning of the interim reporting period in which circumstances change or events occur to cause the transfer.

The mutual funds are included in “Other investments” on the Company’s balance sheets and in “Other Property and Investments” on Spire Missouri’s balance sheets. Changes in their recurring valuations are recorded as unrealized investment gains or losses in the corresponding periodic income statement. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net on the balance sheets when a legally enforceable netting agreement exist between the Company, Spire Missouri or Spire Alabama and the counterparty to the derivative contract. For additional information on derivative instruments, see Note 10, Derivative Instruments and Hedging Activities.

87

 

Spire

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		10.1		—		—		(10.1	)		—
Natural gas commodity contracts		—		36.7		—		(3.6	)		33.1
Other:
U.S. stock/bond mutual funds		37.6		—		—		—			37.6
Interest rate swaps		—		44.2		—		—			44.2
Total	$	74.4	$	81.0	$	—	$	(20.1	)	$	135.3
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
Gas Marketing:
NYMEX/ICE natural gas contracts		21.8		—		—		(21.8	)		—
Natural gas commodity contracts		—		27.6		—		(3.6	)		24.0
Total	$	72.6	$	27.6	$	—	$	(69.4	)	$	30.8
As of September 30, 2022
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		91.8		—		—		(91.8	)		—
Natural gas commodity contracts *		—		56.6		—		(4.0	)		52.6
Other:
U.S. stock/bond mutual funds		29.3		—		—		—			29.3
Interest rate swaps *		—		63.6		—		—			63.6
Total	$	198.0	$	120.2	$	—	$	(153.6	)	$	164.6
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—
Gas Marketing:
NYMEX/ICE natural gas contracts		82.3		—		—		(82.3	)		—
Natural gas commodity contracts *		—		65.5		—		(4.0	)		61.5
Total	$	113.0	$	65.5	$	—	$	(117.0	)	$	61.5

* Subsequent to the issuance of its consolidated financial statements for the year ended September 30, 2022, during the fourth quarter of fiscal 2023, the Company identified an error in the fair value level presentation for certain line items in the Fair Value Measurements table. The presentation has been corrected to reflect the impacted line items in Level 2 rather than Level 1 as of September 30, 2022. This immaterial correction did not impact the reported fair values or the consolidated financial statements.

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Spire Missouri

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Total	$	26.7	$	0.1	$	—	$	(6.4	)	$	20.4
LIABILITIES
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
As of September 30, 2022
ASSETS
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Total	$	76.9	$	—	$	—	$	(57.8	)	$	19.1
LIABILITIES
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—

Spire Alabama

Spire Alabama occasionally utilizes a gasoline derivative program to stabilize the cost of fuel used in operations. As of September 30, 2023 and September 30, 2022, there were no gasoline derivatives outstanding.

10. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Spire

Spire Missouri has a risk management policy to utilize various derivatives, including futures contracts, exchange-traded options and swaps for the explicit purpose of managing price risk associated with purchasing and delivering natural gas on a regular basis to customers in accordance with its tariffs. The objective of this policy is to limit Spire Missouri’s exposure to natural gas price volatility and to manage, hedge and mitigate substantial price risk. Further discussion of this policy can be found in the Spire Missouri section.

From time to time Spire Missouri and Spire Alabama purchase NYMEX futures and options contracts to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment. Further information on these derivatives can be found in the Spire Missouri and Spire Alabama sections, respectively.

In the course of its business, Spire’s gas marketing subsidiary, Spire Marketing enters into commitments associated with the purchase or sale of natural gas. Certain of Spire Marketing’s derivative natural gas contracts are designated as normal purchases or normal sales and, as such, are excluded from the scope of ASC Topic 815 and are accounted for as executory contracts on an accrual basis. Any of Spire Marketing’s derivative natural gas contracts that are not designated as normal purchases or normal sales are accounted for at fair value. At September 30, 2023, the fair values of 567.0 million MMBtu of non-exchange-traded natural gas commodity contracts were reflected in the Consolidated Balance Sheet. Of these contracts, 379.1 million MMBtu will settle during fiscal 2024, and 151.1 million MMBtu, 26.4 million MMBtu, and 3.8 million MMBtu, will settle during fiscal years 2025, 2026, and 2027, respectively. A total of 6.6 million MMBtu will settle in the years 2028-2030. These contracts have not been designated as hedges; therefore, changes in the fair value of these contracts are reported in earnings each period.

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Furthermore, Spire Marketing manages the price risk associated with its fixed-priced commitments by either closely matching the offsetting physical purchase or sale of natural gas at fixed prices or through the use of NYMEX or ICE futures, swap, and option contracts to lock in margins.

At September 30, 2023, Spire Marketing’s unmatched fixed-price positions were not material to Spire’s financial position or results of operations. Spire Marketing’s NYMEX and ICE natural gas futures, swap and option contracts used to lock in margins may be designated as cash flow hedges of forecasted transactions for financial reporting purposes.

Spire enters into cash flow hedges through the execution of interest rate swap contracts to protect itself against adverse movements in interest rates. At September 30, 2023, the following swaps were outstanding:

Period Originated	Contract Hedge Term (Years)		Notional Amount		Fixed Interest Rate			Fiscal 2023 Mark-to-Market Gain
Quarter 1, fiscal 2022		10	$	50.0		1.4918	%	$	2.7
Quarter 2, fiscal 2022		10		75.0		1.6475	%		4.0
Quarter 2, fiscal 2022		10		25.0		1.7460	%		1.5
Quarter 1, fiscal 2023		10		50.0		3.4480	%		2.4
Quarter 2, fiscal 2023		10		50.0		3.6850	%		0.9
Quarter 2, fiscal 2023		10		25.0		3.5350	%		0.5
Quarter 2, fiscal 2023		10		25.0		3.3850	%		0.6
Quarter 3, fiscal 2023		30		50.0		2.7470	%		7.8
Quarter 3, fiscal 2023		10		25.0		2.9020	%		2.2
Quarter 3, fiscal 2023		10		25.0		3.0180	%		2.0
			$	400.0				$	24.6

As of  September 30, 2023, the Company has recorded through other comprehensive income a cumulative mark-to-market net asset of $44.2 on open swaps.

The Company’s and Spire Missouri’s exchange-traded/cleared derivative instruments consist primarily of NYMEX and ICE positions. The NYMEX is the primary national commodities exchange on which natural gas derivatives are traded. Open NYMEX and ICE natural gas futures and swap positions at September 30, 2023 and 2022 were as follows:

	September 30, 2023		September 30, 2022
Gas Marketing	Notional (MMBtu millions)	Maximum Term (Months)	Notional (MMBtu millions)	Maximum Term (Months)
Natural gas futures purchased	61.3	51	76.3	54
Natural gas options purchased, net	4.9	15	3.7	12
Natural gas basis swaps purchased	44.1	51	61.7	39
Gas Utility
Natural gas futures purchased	66.5	24	13.0	12

At September 30, 2023, Spire Missouri also had 16.3 million MMBtu of other price mitigation in place through the use of NYMEX natural gas option-based strategies.

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Derivative instruments designated as cash flow hedges of forecasted transactions are recognized on the balance sheets of the Company at fair value, and the change in fair value of the effective portion of these hedge instruments is recorded, net of income tax, in other comprehensive income or loss (OCI). Accumulated other comprehensive income or loss (AOCI) is a component of Total Common Stock Equity. Amounts are reclassified from AOCI into earnings when the hedged items affect net income, using the same revenue or expense category that the hedged item impacts. Based on market prices at September 30, 2023, it is expected that $2.8 of net gains will be reclassified into the Consolidated Statements of Income of the Company during the next twelve months. Cash flows from hedging transactions are classified in the same category as the cash flows from the items that are being hedged in the Consolidated Statements of Cash Flows.

Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income
	Location of Gain (Loss)
	Recorded in Income	2023			2022			2021
Derivatives in Cash Flow Hedging Relationships
Effective portion of gain recognized in OCI on derivatives:
Interest rate swaps		$	20.1		$	56.7		$	61.2
Effective portion of gain reclassified from AOCI to income:
Interest rate swaps	Interest Expense	$	(2.4	)	$	(1.2	)	$	(1.3	)
Derivatives Not Designated as Hedging Instruments*
Gain (Loss) recognized in income on derivatives:
Gas / diesel futures	Non-Operating Expense: Other Income	$	0.3		$	—		$	—
Natural gas commodity contracts	Operating Expenses: Natural Gas		18.0			52.6			54.1
NYMEX / ICE natural gas contracts	Operating Expenses: Natural Gas		(35.0	)		43.3			(77.5	)
Total		$	(16.7	)	$	95.9		$	(23.4	)

* Gains and losses on Spire Missouri’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Missouri Utilities’ PGA clauses and initially recorded as regulatory assets or regulatory liabilities. These gains and losses are excluded from the table above because they have no direct impact on the statements of income. Such amounts are recognized in the statements of income as a component of natural gas operating expenses when they are recovered through the PGA clause and reflected in customer billings.

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Fair Value of Derivative Instruments in the Consolidated Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	44.2	Current Liabilities: Other	$	—
Subtotal			44.2			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		6.3	Current Liabilities: Other		50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1			—
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other		8.0	Current Liabilities: Other		16.0
	Deferred Charges and Other Assets: Other		2.1	Deferred Credits and Other Liabilities: Other		5.7
Natural gas commodity	Current Assets: Other		31.2	Current Liabilities: Other		20.1
	Deferred Charges and Other Assets: Other		5.5	Deferred Credits and Other Liabilities: Other		7.6
Subtotal			53.2			100.2
Total derivatives		$	97.4		$	100.2
September 30, 2022
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	63.6	Current Liabilities: Other	$	—
Subtotal			63.6			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		57.8	Current Liabilities: Other		30.7
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other	79.2		Current Liabilities: Other		71.5
	Deferred Charges and Other Assets: Other		12.7	Deferred Credits and Other Liabilities: Other		10.8
Natural gas commodity	Current Assets: Other		53.4	Current Liabilities: Other		55.1
	Deferred Charges and Other Assets: Other		3.1	Deferred Credits and Other Liabilities: Other		10.4
Subtotal			206.2			178.5
Total derivatives		$	269.8		$	178.5

* The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

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Following is a reconciliation of the amounts in the tables above to the amounts presented in the consolidated balance sheets:

	2023			2022
Fair value of derivative assets presented above	$	97.4		$	269.8
Fair value of cash margin receivable offset with derivatives		49.3			(36.6	)
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	77.3		$	116.2
Derivative Instrument Assets, per Consolidated Balance Sheets:
Current Assets: Other	$	71.8		$	113.1
Deferred Charges and Other Assets: Other		5.5			3.1
Total	$	77.3		$	116.2
Fair value of derivative liabilities presented above	$	100.2		$	178.5
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	30.8		$	61.5
Derivative Instrument Liabilities, per Consolidated Balance Sheets:
Current Liabilities: Other	$	23.2		$	51.1
Deferred Credits and Other Liabilities: Other		7.6			10.4
Total	$	30.8		$	61.5

Additionally, at September 30, 2023 2022, the Company had zero and $49.8, respectively, in cash margin receivables not offset with derivatives, which are presented in Accounts Receivable – Other.

Spire Missouri

Spire Missouri has a risk management policy to utilize various derivatives, including futures contracts, exchange-traded options, swaps and over-the-counter instruments for the explicit purpose of managing price risk associated with purchasing and delivering natural gas on a regular basis to customers in accordance with its tariffs. The objective of this policy is to limit Spire Missouri’s exposure to natural gas price volatility and to manage, hedge and mitigate substantial price risk. This policy strictly prohibits speculation and permits Spire Missouri to hedge current physical natural gas purchase commitments or forecasted or anticipated future peak (maximum) physical need for natural gas delivered. Costs and cost reductions, including carrying costs, associated with Spire Missouri’s use of natural gas derivative instruments are allowed to be passed on to Spire Missouri customers through the operation of its PGA clause, through which the MoPSC allows Spire Missouri to recover gas supply costs, subject to prudence review by the MoPSC. Accordingly, Spire Missouri does not expect any adverse earnings impact as a result of the use of these derivative instruments.

Spire Missouri does not designate these instruments as hedging instruments for financial reporting purposes because gains or losses associated with the use of these derivative instruments are deferred and recorded as regulatory assets or regulatory liabilities pursuant to ASC Topic 980, Regulated Operations, and, as a result, have no direct impact on the statements of income.

The timing of the operation of the PGA clause may cause interim variations in short-term cash flows, because Spire Missouri is subject to cash margin requirements associated with changes in the values of these instruments. Nevertheless, carrying costs associated with such requirements are recovered through the PGA clause.

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From time to time, Spire Missouri purchases NYMEX futures and options contracts to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment used in the course of its business. The gains and losses on these contracts are not subject to Spire Missouri’s PGA clause. At September 30, 2023, Spire Missouri did not have a material amount of gasoline futures contracts outstanding.

Derivative instruments designated as cash flow hedges of forecasted transactions are recognized on the balance sheets at fair value and the change in the fair value of the effective portion of these hedge instruments is recorded, net of income tax, in OCI. AOCI is a component of Total Common Stock Equity. Amounts are reclassified from AOCI into earnings when the hedged items affect net income, using the same revenue or expense category that the hedged item impacts. As in both 2022 and 2021, there will be no reclassifications into the statements of income during fiscal 2024. Cash flows from hedging transactions are classified in the same category as the cash flows from the items that are being hedged in the statements of cash flows.

Spire Missouri’s derivative instruments consist primarily of NYMEX positions. The NYMEX is the primary national commodities exchange on which natural gas derivatives are traded. Open NYMEX natural gas futures positions at September 30, 2023 and 2022 were as follows:

	September 30, 2023				September 30, 2022
	Notional (MMBtu millions)		Maximum Term (Months)		Notional (MMBtu millions)		Maximum Term (Months)
Natural gas futures purchased		66.5		24		13.0		12

At September 30, 2023, Spire Missouri had also had 16.3 million MMBtu of other price mitigation in place through the use of NYMEX natural gas option-based strategies.

Gains and losses on Spire Missouri’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Spire Missouri’s PGA clauses and initially recorded as regulatory assets or regulatory liabilities. Such amounts are recognized in the statements of income as a component of natural gas operating expenses when they are recovered through the PGA clause and reflected in customer billings.

Fair Value of Derivative Instruments in the Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	6.3	Current Liabilities: Other	$	50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1
Total derivatives		$	6.4		$	50.8
September 30, 2022
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	57.8	Current Liabilities: Other	$	30.7

* The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of Spire Missouri’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

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Following is a reconciliation of the amounts in the tables above to the amounts presented in Spire Missouri’s balance sheets:

	2023			2022
Fair value of derivative assets presented above	$	6.4		$	57.8
Fair value of cash margin (payable) receivable offset with derivatives		37.6			(27.1	)
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	—		$	—
Fair value of derivative liabilities presented above	$	50.8		$	30.7
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	6.8		$	—
Derivative Instrument Liabilities, per Balance Sheets:
Derivative instrument liabilities	$	6.8		$	—
Total	$	6.8		$	—

Additionally, at September 30, 2023 and 2022, Spire Missouri had zero and $24.0, respectively, in cash margin receivables not offset with derivatives, which are presented in Accounts Receivable – Other.

Spire Alabama

Spire Alabama periodically employs a gasoline derivative program to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment used in the course of its business. The gains or losses on these derivative instruments are not subject to Spire Alabama’s GSA rider. There were no such contracts outstanding as of September 30, 2023 and 2022.

11. CONCENTRATIONS OF CREDIT RISK

Spire’s Gas Utility segment serves 1.7 million customers in three states across multiple rate classes resulting in a significant amount of revenue diversity. Credit risk is mitigated by the high percentage of residential customers as well as the geographic diversity of the Utilities, though customers for each of the Utilities are concentrated in a single state.

Spire Marketing’s accounts receivable attributable to utility companies and their marketing affiliates totaled $53.4 at September 30, 2023. The concentration of transactions with these counterparties has the potential to affect the Company’s overall exposure to credit risk, either positively or negatively, in that customers in this group may be affected similarly by changes in economic, industry, or other conditions. Spire Marketing also has concentrations of credit risk with certain individually significant counterparties. At September 30, 2023, the amounts included in accounts receivable from its five largest counterparties (in terms of net accounts receivable exposure) totaled $26.7. Three of these five counterparties are investment-grade-rated integrated utilities, one is a liquefied natural gas project facility with a senior debt issue rating one notch below investment-grade with a positive outlook, and one is a utility marketing affiliate which is not rated but whose owners are all investment-grade public power companies.

To manage these risks, Spire Marketing has established procedures to determine the creditworthiness of its counterparties. These procedures include obtaining credit ratings and credit reports, analyzing counterparty financial statements to assess financial condition, and considering the industry environment in which the counterparty operates. This information is monitored on an ongoing basis. In some instances, Spire Marketing may require credit assurances such as prepayments, letters of credit, or parental guaranties. In addition, Spire Marketing may enter into netting arrangements to mitigate credit risk with counterparties in the energy industry with whom it conducts both sales and purchases of natural gas. Where there is no netting arrangement, Spire Marketing records accounts receivable, accounts payable, and prepayments for physical sales and purchases of natural gas on a gross basis. Sales are typically made on an unsecured credit basis with payment due the month following delivery. Accounts receivable amounts are closely monitored and provisions for uncollectible amounts are accrued when losses are probable.

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12. INCOME TAXES

The Company, Spire Missouri, and Spire Alabama are subject to federal income tax as well as income tax in various state and local jurisdictions. Spire files a consolidated federal income tax return and various state income tax returns and allocates income taxes to Spire Missouri, Spire Alabama and its other subsidiaries as if each entity were a separate taxpayer.

The provision for income taxes during the fiscal years ended September 30, 2023, 2022, and 2021 was as follows:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023		2022		2021
Federal:
Current	$	0.7		$	0.5		$	0.2		$	—		$	—		$	—		$	—	$	—	$	—
Deferred		30.4			47.0			49.5			10.1			18.2			22.0			15.8		18.1		19.8
Investment tax credits		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		—		—		—
State and local:
Current		1.2			0.5			1.3			—			—			—			—		—		—
Deferred		6.7			11.1			17.7			1.7			3.3			3.5			4.5		5.1		5.2
Total income tax expense	$	38.8		$	58.9		$	68.5		$	11.6		$	21.3		$	25.3		$	20.3	$	23.2	$	25.0

The effective income tax rate varied from the federal statutory income tax rate for each year due to the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Federal income tax statutory rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
State and local income taxes, net of federal income tax benefits		3.7			3.6			3.6			2.6			2.6			2.6			4.1			4.1			4.1
Certain expenses capitalized on books and deducted on tax return		(1.4	)		(1.6	)		(1.6	)		(2.7	)		(3.2	)		(3.3	)		—			—			—
Taxes related to prior years		—			(0.3	)		(0.5	)					(0.6	)		(0.2	)		—			—			—
Tax credits *		(3.3	)		—			—			(4.2	)		—			—			(1.9	)		—			—
Amortization of excess deferred taxes		(5.1	)		(3.5	)		(2.5	)		(7.7	)		(7.3	)		(5.0	)		0.2			—			—
Other items – net **		0.2			1.9			0.1			—			3.1			(0.2	)		0.1			0.2			0.2
Effective income tax rate		15.1	%		21.1	%		20.1	%		9.0	%		15.6	%		14.9	%		23.5	%		25.3	%		25.3	%

*	In 2023, the Company completed a research and development study which encompassed fiscal years 2014 to 2022.
**	Other consists primarily of property adjustments.

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The significant items comprising the net deferred tax liability or asset as of September 30 were as follows:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Deferred tax assets:
Reserves not currently deductible	$	27.7		$	33.5		$	—		$	4.0		$	3.9		$	7.4
Pension and other postretirement benefits		64.4			72.6			44.7			52.6			17.0			—
Goodwill		—			—			—			—			58.8			73.0
Operating losses		239.2			255.1			89.2			116.9			159.8			140.3
Regulatory amount due to customers, net		30.4			34.5			27.6			30.7			—			—
Other		35.8			24.9			10.5			—			3.0			—
Total deferred tax assets		397.5			420.6			172.0			204.2			242.5			220.7
Deferred tax liabilities:
Relating to property		(788.0	)		(740.0	)		(507.7	)		(489.3	)		(218.7	)		(201.6	)
Regulatory pension and other postretirement benefits		(80.6	)		(92.8	)		(53.0	)		(72.3	)		(25.9	)		(1.6	)
Deferred gas costs		(67.0	)		(75.8	)		(64.1	)		(74.0	)		—			—
Other ***		(205.6	)		(187.1	)		(79.0	)		(68.7	)		(7.0	)		(6.5	)
Total deferred tax liabilities		(1,141.2	)		(1,095.7	)		(703.8	)		(704.3	)		(251.6	)		(209.7	)
Net deferred tax (liability) asset	$	(743.7	)	$	(675.1	)	$	(531.8	)	$	(500.1	)	$	(9.1	)	$	11.0

*** For Spire, Other consists primarily of goodwill-related liabilities.

As indicated in Note 1, Summary of Significant Accounting Policies, the Company’s regulated operations accounting for income taxes is impacted by ASC Topic 980, Regulated Operations. The Tax Cuts and Jobs Act of 2017 (TCJA) reduced the corporate federal income tax rate, and the corresponding reductions in deferred income tax balances resulted in amounts previously collected from utility customers for these deferred taxes becoming refundable to such customers, generally through reductions in future rates. The TCJA includes provisions that stipulate how these excess deferred taxes are to be passed back to customers for certain accelerated tax depreciation benefits. In fiscal 2018, the MoPSC Amended Report and Order took effect and the estimated excess accumulated deferred income tax began to be returned to Spire Missouri customers in rates. During the prior fiscal year, the amount of excess accumulated deferred income taxes was trued up as part of the rate proceeding. The amount being returned related to the TCJA has been updated and in addition the excess accumulated deferred income taxes related to the Missouri tax rate change began to be returned in fiscal 2022. For Spire Missouri, excess accumulated deferred taxes of $10.0, $9.9, and $8.4, respectively, were returned in fiscal year 2023, 2022, and 2021. The treatment for accumulated deferred income tax balances for Spire Alabama, Spire Gulf and Spire Mississippi started to be accounted for during fiscal 2023. For Spire Gulf, $3.1 was returned to ratepayers. Spire Mississippi returned less than $0.1. For Spire Alabama, the deferred tax position resulted in a collection from customers of $0.2 for fiscal 2023.

On April 14, 2023, the IRS issued Revenue Procedure 2023-15 that provides a safe harbor method of accounting that taxpayers may use to determine whether to deduct or capitalize expenditures to repair, maintain, replace, or improve natural gas transmission and distribution property. Under the revenue procedure, the method of accounting will depend on the property’s classification as linear transmission property, linear distribution property, or non-linear property. The revenue procedure may be adopted in tax years ending after May 1, 2023. The Company is evaluating the revenue procedure and the impact adopting the safe harbor would have on its property that is subject to this guidance.

In assessing whether deferred tax assets are realizable, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Management considers all significant available positive and negative evidence, including the existence of losses in recent years, the timing of deferred tax liability reversals, projected future taxable income, taxable income in carryback years, and tax planning strategies to assess the need for a valuation allowance. Based upon this evidence, management believes it is more likely than not the Company, Spire Missouri and Spire Alabama will realize the benefits of these deferred tax assets.

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As of September 30, 2023, Spire, and on a separate company basis, Spire Missouri and Spire Alabama, had federal and state loss carryforwards, contribution carryforwards, and various tax credit carryforwards as shown below.

	Spire		Spire Missouri		Spire Alabama
Federal and state loss carryforwards	$	1,000.3	$	352.4	$	624.1
Contribution carryforwards		6.1		5.6		-
Tax credit carryforwards		13.1		8.5		1.6

For federal tax purposes, Spire Missouri’s and Spire Alabama’s loss carryforwards may be utilized against income from another member of the consolidated group. The loss carryforwards begin to expire in fiscal 2030 for certain state purposes and fiscal 2035 for federal and other state purposes. Contribution carryforwards and tax credit carryforwards are expected to be utilized prior to their expiration.

The Company, Spire Missouri and Spire Alabama recognize the tax benefit from a tax position only if it is at least more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. Unrecognized tax benefits are reported as a reduction of a deferred tax asset for an operating loss carryforward to the extent the recognition of the benefit would impact the operating loss carryforward, pursuant to ASU 2013-11. The following table presents a reconciliation of the beginning and ending balances of unrecognized tax benefits:

	Spire							Spire Missouri						Spire Alabama
	2023		2022			2021		2023		2022		2021		2023		2022		2021
Unrecognized tax benefits, beginning of year	$	19.6	$	16.4		$	13.2	$	19.3	$	16.1	$	13.0	$	—	$	—	$	—
Increases related to tax positions taken in current year		4.2		3.3			3.2		3.6		3.2		3.1		0.3		—		—
Reductions due to lapse of applicable statute of limitations		—		(0.1	)		—		—		—		—		—		—		—
Unrecognized tax benefits, end of year	$	23.8	$	19.6		$	16.4	$	22.9	$	19.3	$	16.1	$	0.3	$	—	$	—

As of September 30, 2023 and 2022, the amounts of unrecognized tax benefits which, if recognized, would affect the effective tax rate were $5.9 and $4.0, respectively, for the Company, $5.1 and $3.7, respectively, for Spire Missouri, and $0.3 and $0.0, respectively, for Spire Alabama. It is reasonably possible that events will occur in the next 12 months that could increase or decrease the amount of the unrecognized tax benefits. The Company, Spire Missouri, and Spire Alabama do not expect that any such change will be significant to the balance sheets. Spire Alabama reported no unrecognized tax benefits for fiscal years 2022 and 2021.

The Company, Spire Missouri, and Spire Alabama record potential interest and penalties related to uncertain tax positions as interest expense and other income deductions, respectively. As of September 30, 2023 and 2022, interest accrued associated with uncertain tax positions was de minimis, and no penalties were accrued.

The Company, Spire Missouri, and Spire Alabama are no longer subject to examination for fiscal years prior to 2020, except to the extent the net operating losses from prior years are reviewed.

13. PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS

Pension Plans

Spire and the Utilities maintain pension plans for their employees. Spire Missouri and Spire Alabama have non-contributory, defined benefit, trusteed forms of pension plans covering the majority of their employees. Qualified plan assets are comprised of mutual and commingled funds consisting of U.S. equities with varying strategies, global equities, alternative investments, and fixed income investments.

98

 

The net periodic pension cost includes components shown in the following table. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.”

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	16.3		$	20.0		$	21.7		$	11.4		$	14.4		$	15.4		$	4.2		$	4.8		$	5.5
Interest cost on projected benefit obligation		25.1			21.5			20.7			17.8			14.7			14.2			4.8			4.7			4.6
Expected return on plan assets		(24.5	)		(31.3	)		(31.6	)		(18.0	)		(22.7	)		(22.5	)		(3.5	)		(5.2	)		(5.8	)
Amortization of prior service credit		(4.5	)		(4.5	)		(3.1	)		(1.9	)		(1.9	)		(0.6	)		(2.4	)		(2.4	)		(2.3	)
Amortization of actuarial loss		6.6			11.9			14.9			6.1			9.6			11.0			0.9			2.4			3.9
Loss on lump-sum settlements and curtailments		9.7			33.6			18.2			0.6			27.3			11.6			9.1			6.3			6.6
Subtotal		28.7			51.2			40.8			16.0			41.4			29.1			13.1			10.6			12.5
Regulatory adjustment		26.3			12.5			20.6			27.1			9.9			19.0			(1.7	)		1.7			0.7
Net pension cost	$	55.0		$	63.7		$	61.4		$	43.1		$	51.3		$	48.1		$	11.4		$	12.3		$	13.2

Other changes in plan assets and pension benefit obligations recognized in other comprehensive income or loss include the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial loss (gain)	$	14.5		$	(16.9	)	$	(8.1	)	$	5.7		$	0.9		$	(0.9	)	$	9.0		$	(16.0	)	$	(1.5	)
Amortization of actuarial loss		(6.6	)		(11.9	)		(14.9	)		(6.1	)		(9.6	)		(11.0	)		(0.9	)		(2.4	)		(3.9	)
Acceleration of loss recognized due to settlement		(9.7	)		(33.6	)		(18.2	)		(0.6	)		(27.3	)		(11.6	)		(9.1	)		(6.3	)		(6.6	)
Current year service credit		—			—			(17.9	)		—			—			(17.9	)		—			—			—
Amortization of prior service credit		4.5			4.5			3.1			1.9			1.9			0.6			2.4			2.4			2.3
Subtotal		2.7			(57.9	)		(56.0	)		0.9			(34.1	)		(40.8	)		1.4			(22.3	)		(9.7	)
Regulatory adjustment		(2.8	)		56.3			57.3			(1.0	)		32.5			42.1			(1.4	)		22.3			9.7
Total recognized in OCI	$	(0.1	)	$	(1.6	)	$	1.3		$	(0.1	)	$	(1.6	)	$	1.3		$	—		$	—		$	—

Spire pension obligations are driven by separate plan and regulatory provisions governing Spire Missouri, Spire Alabama and Spire EnergySouth pension plans.

Pursuant to the provisions of Spire Missouri’s and Spire Alabama’s pension plans, pension obligations may be satisfied by monthly annuities, lump-sum cash payments, or special termination benefits. Lump-sum payments are recognized as settlements (which can result in gains or losses) only if the total of such payments exceeds the sum of service and interest costs in a specific year. Special termination benefits, when offered, are also recognized as settlements which can result in gains or losses.

In the fiscal year ended September 30, 2023, one Spire Missouri plan and two Spire Alabama plans met the criteria for settlement recognition, requiring re-measurement of the obligation under those plans using updated census data and assumptions for discount rate and mortality. For the remeasurements, the discount rate for the Missouri plan was updated to 6.3% at September 30, 2023 (from 5.8% at September 30, 2022), and the discount rate for the Alabama plans were updated to 6.2% and 6.25%, respectively, (from 5.7% and 5.65%, respectively). Lump-sum payments recognized as settlements during fiscal 2023 was $48.7 ($9.9 attributable to Spire Missouri and $38.8 to Spire Alabama). The Alabama regulatory tariff requires that settlement losses be amortized over the remaining actuarial life of the individuals in the plan, and in fiscal 2023 the amortization periods range from 11.8 years to 13.4 years. Therefore, no lump sum settlement expenses were recorded in the fiscal year ended September 30, 2023.

99

 

In the fiscal year ended September 30, 2022, two Spire Missouri plans and two Spire Alabama plans met the criteria for settlement recognition, requiring re-measurement of the obligation under those plans using updated census data and assumptions for discount rate and mortality. For the remeasurements, the discount rates for the Missouri plans were updated to 5.7% and 5.8%, respectively, for each plan at September 30, 2022 (from 3.0%, at September 30, 2021), and the discount rate for the Alabama plans were updated to 5.7% and 5.65%, respectively, (from 3.1% and 3.0%, respectively). Lump-sum payments recognized as settlements during fiscal 2022 was $109.3 ($87.0 attributable to Spire Missouri and $22.3 to Spire Alabama). The Alabama regulatory tariff requires that settlement losses be amortized over the remaining actuarial life of the individuals in the plan, and in fiscal 2022 the amortization periods range from 11.4 years to 12.3 years. Therefore, no lump sum settlement expenses were recorded in the fiscal year ended September 30, 2022.

Effective December 23, 2021, the pension cost for Spire Missouri’s western territory (Missouri West) included in customer rates was reduced from $5.5 to $4.4 per year, the pension cost included in Spire Missouri’s eastern territory (Missouri East) customer rates was increased from $29.0 to $32.4 per year. Subsequently, on December 26, 2022, the amount in Missouri East was lowered to $29.9. The difference between these amounts and pension expense as calculated pursuant to the above and that otherwise would be included in the statements of income and statements of comprehensive income is deferred as a regulatory asset or regulatory liability.

Also effective December 23, 2021, Missouri East prepaid pension assets and other postretirement benefits that were previously being included in rates at $21.6 per year for eight years were reduced to $11.0 per year, with the amortization period being reset for another eight years. Missouri West net liability for pension and other postretirement benefits that were previously reducing rates by $3.3 per year for eight years were reduced to a $1.1 reduction in rates per year, with the amortization period being reset for another eight years. Subsequently, on December 26, 2022, Missouri East amortization was lowered to $6.9 and Missouri West to a reduction of $0.8.

The following table shows the reconciliation of the beginning and ending balances of the pension benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	464.4		$	689.6		$	320.6		$	479.0		$	97.8		$	149.4
Service cost		16.3			20.0			11.4			14.4			4.2			4.8
Interest cost		25.1			21.5			17.8			14.7			4.8			4.7
Actuarial (gain) loss		(1.1	)		(173.9	)		(4.9	)		(116.2	)		5.4			(42.4	)
Settlement loss		9.7			33.4			0.6			27.9			9.1			5.6
Settlement benefits paid		(48.8	)		(109.3	)		(9.9	)		(87.0	)		(38.8	)		(22.3	)
Regular benefits paid		(26.9	)		(16.9	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Benefit obligation, end of year	$	438.7		$	464.4		$	313.2		$	320.6		$	80.6		$	97.8
Accumulated benefit obligation, end of year	$	433.1		$	457.1		$	309.5		$	315.0		$	78.8		$	96.2

In 2023, qualified plans except Spire Alabama's experienced actuarial gains. These gains were driven by the discount rates increasing by between 50 and 55 basis points, and were only partly offset by actuarial asset losses, as the trusts experienced actual returns below the actuarial expected returns. However, Spire Alabama had actuarial losses relating to larger than projected settlements, which, when combined with the actuarial asset losses, more than offset the gains relating to the increase in the discount rate.

100

 

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets, beginning of year	$	332.7		$	498.9		$	235.9		$	364.0		$	57.3		$	82.8
Actual return on plan assets		9.1			(92.5	)		7.5			(66.7	)		—			(15.6	)
Employer contributions		58.9			52.4			30.3			37.8			27.9			14.4
Settlement benefits paid		(39.1	)		(109.3	)		(9.3	)		(87.0	)		(29.7	)		(22.3	)
Regular benefits paid		(26.9	)		(16.8	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Fair value of plan assets, end of year	$	334.7		$	332.7		$	242.0		$	235.9		$	53.6		$	57.3
Funded status of plans, end of year	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Current liabilities	$	(1.6	)	$	(1.1	)	$	(1.6	)	$	(1.1	)	$	—		$	—
Noncurrent liabilities		(102.4	)		(130.6	)		(69.6	)		(83.6	)		(27.0	)		(40.5	)
Total	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic pension cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial loss	$	130.1		$	132.0		$	92.5		$	93.6		$	40.2		$	41.2
Prior service credit		(31.2	)		(35.7	)		(16.2	)		(18.1	)		(13.9	)		(16.3	)
Subtotal		98.9			96.3			76.3			75.5			26.3			24.9
Adjustments for amounts included in regulatory assets		(95.9	)		(93.1	)		(73.3	)		(72.3	)		(26.3	)		(24.9	)
Total	$	3.0		$	3.2		$	3.0		$	3.2		$	—		$	—

The assumptions used to calculate net periodic pension costs for Spire Missouri are as follows:

	2023		2022		2021
Weighted average discount rate - Spire Missouri East plan		5.70%		3.00%		2.85%
Weighted average discount rate - Spire Missouri West plan		5.80%		3.00%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

The assumptions used to calculate net periodic pension costs for Spire Alabama are as follows:

	2023		2022		2021
Weighted average discount rate	5.65%/5.7%		3.10%/3.0%		2.95%/2.80%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

The discount rate is based on long-term, high quality bond indices at the measurement date. The expected long-term rate of return on plan assets is based on historical and projected rates of return for current and planned asset classes in the investment portfolio. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns. The overall expected rate of return for the portfolio was developed based on the target allocation for each class.

101

 

The assumptions used to calculate the benefit obligations are as follows:

	2023		2022
Weighted average discount rate - Spire Missouri East plan		6.25%		5.70%
Weighted average discount rate - Spire Missouri West plan		6.30%		5.80%
Weighted average discount rate - Spire Alabama plans	6.2%/6.25%		5.70%/5.65%
Weighted average rate of future compensation increase		3.00%		3.00%
Cash balance interest crediting rate - Spire Alabama / Spire Missouri		4.25%		4.25%

The following table sets forth the year-end projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for plans that have a projected benefit obligation and an accumulated benefit obligation in excess of plan assets:

	Spire				Spire Missouri				Spire Alabama
	2023		2022		2023		2022		2023		2022
Projected benefit obligation	$	438.7	$	464.4	$	313.2	$	320.6	$	80.6	$	97.8
Accumulated benefit obligation		433.1		457.1		309.5		315.0		78.8		96.2
Fair value of plan assets		334.7		332.7		242.0		235.9		53.6		57.3

The following tables set forth the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		70.0	%		77.0	%		70.0	%		74.3	%
Liability hedging assets		30.0	%		20.0	%		30.0	%		22.8	%
Cash and cash equivalents		—	%		3.0	%		—	%		2.9	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Spire Alabama	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		75.0	%		76.0	%		70.0	%		68.7	%
Liability hedging assets		25.0	%		15.0	%		30.0	%		25.3	%
Cash and cash equivalents		—	%		9.0	%		—	%		6.0	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

The Spire Inc. Retirement Plans Committee is responsible for the administration of the various plans, and all payments under the plans require direction of that committee. The Spire Inc. Defined Benefit Plan Investment Review Committee utilizes an Outsourced Chief Investment Officer (OCIO) model where investment decisions are outsourced to investment consultants (Willis Towers Watson), who in turn become co-fiduciaries with the committee.

For all plans, the Company employs a total return investment approach whereby a mix of equities and fixed income investments are used to maximize the long-term return of plan assets with a prudent level of risk. Risk tolerance is established through consideration of plan liabilities, plan funded status, corporate financial condition and market conditions. The Company has developed an investment strategy that focuses on asset allocation, diversification and quality guidelines. The investment goals are to obtain an adequate level of return to meet future obligations of the plan by providing above average risk-adjusted returns with a risk exposure in the mid-range of comparable funds. Comparative market and peer group benchmarks are utilized to ensure that investment managers are performing satisfactorily. The Company seeks to maintain an appropriate level of diversification to minimize the risk of large losses in a single asset class. Accordingly, plan assets for the pension plans do not have a concentration of assets in a single entity, industry, country, commodity or class of investment fund.

102

 

The following table sets forth expected pension benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter, for Spire, Spire Missouri, and Spire Alabama:

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	52.4	$	45.3	$	41.8	$	41.8	$	43.3	$	202.8
Spire Missouri		41.0		34.1		30.4		29.4		30.5		139.1
Spire Alabama		8.0		7.7		7.8		8.7		8.9		44.1

The funding policy of Spire Missouri and Spire Alabama is to contribute an amount not less than the minimum required by government funding standards nor more than the maximum deductible amount for federal income tax purposes. Spire Missouri’s contributions to the pension plans in fiscal 2024 are anticipated to be $21.6 into the qualified trusts, and $0 into the non-qualified plans. Spire Alabama’s contributions to the pension plans in fiscal 2024 are anticipated to be $16.4 into the qualified trusts.

Other Postretirement Benefits

Spire and the Utilities provide certain life insurance benefits at retirement. Spire Missouri plans provide for medical insurance after early retirement until age 65. For retirements prior to January 1, 2015, the Missouri West plans provided medical insurance after retirement until death. The Spire Alabama plans provide medical insurance upon retirement until death for certain retirees depending on the type of employee and the date the employee was originally hired.

Net periodic postretirement benefit costs consist of the following components:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	4.8		$	7.5		$	7.3		$	4.0		$	6.3		$	6.2		$	0.7		$	1.1		$	0.9
Interest cost on accumulated postretirement benefit obligation		8.5			6.0			6.0			6.5			4.5			4.5			1.8			1.4			1.3
Expected return on plan assets		(15.8	)		(16.8	)		(16.1	)		(10.5	)		(11.3	)		(10.9	)		(5.0	)		(5.2	)		(4.9	)
Amortization of prior service cost (credit)		0.3			1.0			1.0			0.6			0.7			0.7			(0.3	)		0.3			0.3
Amortization of actuarial gain		(4.0	)		(2.2	)		(1.6	)		(3.2	)		(1.9	)		(1.5	)		(0.5	)		—			—
Subtotal		(6.2	)		(4.5	)		(3.4	)		(2.6	)		(1.7	)		(1.0	)		(3.3	)		(2.4	)		(2.4	)
Regulatory adjustment		0.6			3.3			13.2			1.8			5.0			15.0			(1.3	)		(1.8	)		(1.8	)
Net postretirement benefit (income) cost	$	(5.6	)	$	(1.2	)	$	9.8		$	(0.8	)	$	3.3		$	14.0		$	(4.6	)	$	(4.2	)	$	(4.2	)

Other changes in plan assets and postretirement benefit obligations recognized in OCI include the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial (gain) loss	$	(24.4	)	$	15.8		$	(41.0	)	$	(21.5	)	$	9.8		$	(29.0	)	$	(1.1	)	$	5.9		$	(9.9	)
Amortization of actuarial gain		4.0			2.2			1.6			3.2			1.9			1.5			0.5			—			—
Current year prior service cost		—			(6.3	)		—						(1.1	)		—			—			(5.2	)		—
Amortization of prior service (cost) credit		(0.3	)		(1.0	)		(1.0	)		(0.6	)		(0.7	)		(0.7	)		0.3			(0.3	)		(0.3	)
Subtotal		(20.7	)		10.7			(40.4	)		(18.9	)		9.9			(28.2	)		(0.3	)		0.4			(10.2	)
Regulatory adjustment		20.7			(10.7	)		40.4			18.9			(9.9	)		28.2			0.3			(0.4	)		10.2
Total recognized in OCI	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—

Pursuant to a MoPSC Order, the return on plan assets is based on the market-related value of plan assets implemented prospectively over a four-year period. Gains and losses not yet includible in postretirement benefit cost are amortized only to the extent that such gain or loss exceeds 10% of the greater of the accumulated postretirement benefit obligation or the market-related value of plan assets. Such excess is amortized over the average remaining service life of active participants. Effective December 23, 2021, the $8.6 allowance for recovery in rates for Spire Missouri’s postretirement benefit plans was discontinued. The difference between no recovery in rates and postretirement expense as calculated pursuant to the above and that otherwise would be included in the statements of income and statements of comprehensive income is deferred as a regulatory asset or regulatory liability. Effective with the resolution of the 2022 Missouri rate case in December 2022, net liabilities for postretirement benefits reduced rates $0.9 and $0.1 per year for Missouri East and Missouri West, respectively.

103

 

The following table sets forth the reconciliation of the beginning and ending balances of the postretirement benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	148.1		$	204.2		$	114.8		$	151.7		$	29.9		$	48.0
Service cost		4.8			7.5			4.0			6.3			0.7			1.1
Interest cost		8.5			6.0			6.5			4.5			1.8			1.4
Actuarial (gain) loss		(10.6	)		(52.6	)		(13.4	)		(37.7	)		4.2			(13.6	)
Plan amendments		—			(6.2	)		—			(1.0	)		—			(5.2	)
Retiree drug subsidy program		0.2			0.2			0.2			0.2			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Benefit obligation, end of year	$	142.6		$	148.1		$	105.3		$	114.8		$	35.1		$	29.9

In fiscal 2023, the actuarial gains for all qualified Spire plans were driven by the increase in the discount rate used to calculate the benefit obligation, combined with actuarial asset gains resulting from actual trust returns exceeding the expected returns. For Spire Alabama, these gains were more than offset by the loss associated with the difference between actual and assumed enrollment in Health Retirement Accounts. 

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets at beginning of year	$	264.7		$	326.9		$	176.7		$	221.7		$	83.3		$	99.4
Actual return on plan assets		29.9			(51.6	)		18.8			(36.2	)		10.2			(14.3	)
Employer contributions		0.1			0.4			0.1			0.4			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Fair value of plan assets, end of year	$	286.3		$	264.7		$	188.8		$	176.7		$	92.0		$	83.3
Funded status of plans, end of year	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9		$	53.4

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023		2022
Noncurrent assets	$	180.7		$	151.6		$	120.5		$	96.9		$	56.9	$	53.4
Current liabilities		(0.4	)		(0.3	)		(0.4	)		(0.3	)		—		—
Noncurrent liabilities		(36.6	)		(34.7	)		(36.6	)		(34.7	)		—		—
Total	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9	$	53.4

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic postretirement benefit cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial gain	$	(103.3	)	$	(83.3	)	$	(92.3	)	$	(74.2	)	$	(6.1	)	$	(5.6	)
Prior service cost (credit)		7.0			7.1			7.4			7.9			(0.4	)		(0.8	)
Subtotal		(96.3	)		(76.2	)		(84.9	)		(66.3	)		(6.5	)		(6.4	)
Adjustments for amounts included in regulatory assets		96.3			76.2			84.9			66.3			6.5			6.4
Total	$	—		$	—		$	—		$	—		$	—		$	—

104

 

The assumptions used to calculate net periodic postretirement benefit costs for Spire Missouri are as follows:

	2023		2022		2021
Weighted average discount rate - Spire Missouri plans		5.80%		2.95%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets - Spire Missouri plans		5.50%		5.75%		5.75%

The assumptions used to calculate net periodic postretirement benefit costs for Spire Alabama are as follows:

	2023		2022		2021
Weighted average discount rate		5.80%		2.95%		2.75%
Expected long-term rate of return on plan assets	4.75%/6.0%		5.00%/6.25%		5.00%/6.25%

The discount rate is based on long-term, high quality bond indices at the measurement date. The expected long-term rate of return on plan assets is based on historical and projected rates of return for current and planned asset classes in the investment portfolio. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns. The overall expected rate of return for the portfolio was developed based on the target allocation for each class.

The assumptions used to calculate the accumulated postretirement benefit obligations are as follows:

	2023		2022
Weighted average discount rate - Spire Alabama plans and Spire Missouri Plans		6.30%		5.80%
Weighted average rate of future compensation increase - Spire Missouri East plans		3.00%		3.00%

The assumed medical cost trend rates at September 30 are as follows:

	2023	2022
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri	6.50%	6.75%
Rate to which the medical cost trend rate is assumed to decline (the ultimate medical cost trend rate)	5.00%	5.00%
Year the rate reaches the ultimate trend	2030	2028

The following tables set forth the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	Target			2023 Actual			2022 Actual
Equity securities		60.0	%		58.9	%		58.7	%
Debt securities		40.0	%		38.1	%		40.5	%
Cash and cash equivalents		—	%		3.0	%		0.8	%
Total		100.0	%		100.0	%		100.0	%

Spire Alabama	Target			2023 Actual			2022 Actual
Equity securities		60.5	%		59.9	%		57.7	%
Debt securities		39.5	%		40.1	%		42.3	%
Total		100.0	%		100.0	%		100.0	%

Missouri and Alabama state laws provide for the recovery in rates of costs accrued pursuant to GAAP provided that such costs are funded through an independent, external funding mechanism. The Utilities have established Voluntary Employees’ Beneficiary Association and Rabbi Trusts as external funding mechanisms. Their investment policies seek to maximize investment returns consistent with their tolerance for risk. Outside investment management specialists are utilized in each asset class. Such specialists are provided with guidelines, where appropriate, designed to ensure that the investment portfolio is managed in accordance with policy. Performance and compliance with the guidelines is regularly monitored. Spire Missouri and Spire Alabama currently invest in mutual funds which are rebalanced periodically to the target allocation. The mutual funds are diversified across U.S. stock and bond markets, and for Spire Alabama, international stock markets.

105

 

The following table sets forth expected postretirement benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter for Spire, Spire Missouri, and Spire Alabama:

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	14.6	$	14.8	$	14.9	$	14.8	$	14.5	$	68.6
Spire Missouri		11.6		11.8		11.8		11.7		11.4		52.2
Spire Alabama		2.9		2.9		2.9		2.9		2.9		15.0

The Utilities’ funding policy is to contribute amounts to the trusts equal to the periodic benefit cost calculated pursuant to GAAP as recovered in rates. For both Spire Missouri and Spire Alabama there are no anticipated contributions to the postretirement plans in fiscal 2024.

Other Plans

Spire Services Inc. sponsors a 401(k) plan that cover substantially all employees of Spire Inc. and its subsidiaries. The plan allows employees to contribute a portion of their base pay in accordance with specific guidelines. The cost of the defined contribution plan for Spire Inc. totaled $15.5, for fiscal years 2023, 2022, and 2021, respectively. Spire Missouri provides a match of such contributions within specific limits. The cost of the defined contribution plan for Spire Missouri amounted to $9.1, $10.9, and $10.9 for fiscal years 2023, 2022, and 2021, respectively. Spire Alabama also provides a match of employee contributions within specific limits. The cost of the defined contribution plan for Spire Alabama amounted to $3.1, $3.6, and $2.9 for fiscal years 2023, 2022, and 2021, respectively.

Fair Value Measurements of Pension and Other Postretirement Plan Assets

Spire

The table below categorizes the fair value measurements of the Spire pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	14.8	$	—	$	14.8	$	11.5	$	—	$	11.5
Equity funds - global (including U.S.)		—		139.0		139.0		—		122.2		122.2
Real asset funds		—		55.2		55.2		—		61.0		61.0
Debt securities:
U.S. bond funds		27.8		—		27.8		42.3		—		42.3
U.S. government index funds		36.2		—		36.2		36.1		—		36.1
Global funds (including U.S.)		—		61.7		61.7		—		59.6		59.6
Total	$	78.8	$	255.9	$	334.7	$	89.9	$	242.8	$	332.7

106

 

The table below categorizes the fair value measurements of Spire’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	5.1	$	—	$	5.1	$	3.5	$	—	$	3.5
U.S. stock/bond mutual funds		188.2		76.5		264.7		177.1		69.4		246.5
International fund		—		16.5		16.5		0.8		13.9		14.7
Total	$	193.3	$	93.0	$	286.3	$	181.4	$	83.3	$	264.7

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

Spire Missouri

The table below categorizes the fair value measurements of Spire Missouri’s pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	6.8	$	—	$	6.8	$	5.7	$	—	$	5.7
Equity funds - global (including U.S.)		—		99.4		99.4		—		85.7		85.7
Real asset funds		—		40.2		40.2		—		47.2		47.2
Debt securities:
U.S. bond funds		20.9		—		20.9		29.4		—		29.4
U.S. government index funds		28.7		—		28.7		24.6		—		24.6
Global funds (including U.S.)		—		46.0		46.0		—		43.3		43.3
Total	$	56.4	$	185.6	$	242.0	$	59.7	$	176.2	$	235.9

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The table below categorizes the fair value measurements of Spire Missouri’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.3	$	—	$	4.3	$	2.7	$	—	$	2.7
U.S. stock/bond mutual funds		184.5		—		184.5		174.0		—		174.0
Total	$	188.8	$	—	$	188.8	$	176.7	$	—	$	176.7

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

Spire Alabama

The table below categorizes the fair value measurements of Spire Alabama’s pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.6	$	—	$	4.6	$	3.5	$	—	$	3.5
Equity funds - global (including U.S.)		—		22.9		22.9		—		21.6		21.6
Real asset funds		—		8.7		8.7		—		8.1		8.1
Debt securities:
U.S. bond funds		4.0		—		4.0		7.7		—		7.7
U.S. government index funds		4.3		—		4.3		6.8		—		6.8
Global funds (including U.S.)		—		9.1		9.1		—		9.6		9.6
Total	$	12.9	$	40.7	$	53.6	$	18.0	$	39.3	$	57.3

108

 

The table below categorizes the fair value measurements of Spire Alabama’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
U.S. stock/bond mutual funds	$	—	$	76.5	$	76.5	$	—	$	69.4	$	69.4
International fund		—		15.5		15.5		—		13.9		13.9
Total	$	—	$	92.0	$	92.0	$	—	$	83.3	$	83.3

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

14. INFORMATION BY OPERATING SEGMENT

The Company has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment is the aggregation of the operations of the Utilities. The Gas Marketing segment includes the results of Spire Marketing, a subsidiary engaged in the non-regulated marketing of natural gas and related activities, including utilizing natural gas storage contracts for providing natural gas sales. The Midstream segment includes Spire STL Pipeline, a subsidiary of Spire providing interstate natural gas pipeline transportation services, and Spire Storage, a subsidiary of Spire providing interstate natural gas storage services. Other components of the Company’s consolidated information include Spire’s subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.

Accounting policies are described in Note 1, Summary of Significant Accounting Policies. Intersegment transactions include sales of natural gas from Spire Marketing to Spire Missouri and Spire Alabama, sales of natural gas from Spire Missouri to Spire Marketing, sales of natural gas from Spire Alabama to Spire Marketing, propane transportation services provided by Spire NGL Inc. to Spire Missouri, and propane storage services provided by Spire Missouri to Spire NGL Inc.

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Management evaluates the performance of the operating segments based on the computation of net economic earnings. Net economic earnings exclude from reported net income, as applicable, the after-tax impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of other non-recurring or unusual items such as certain regulatory, legislative or GAAP standard-setting actions.

	Gas		Gas
2023	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,456.6	$	179.1	$	29.9	$	0.7		$	—		$	2,666.3
Intersegment revenues		0.3		—		36.2		16.0			(52.5	)		—
Total Operating Revenues		2,456.9		179.1		66.1		16.7			(52.5	)		2,666.3
Depreciation and amortization expense		244.4		1.5		8.4		0.5			—			254.8
Interest expense		139.9		—		8.6		72.1			(34.9	)		185.7
Income tax expense (benefit)		32.7		12.8		3.8		(10.5	)		—			38.8
Net economic earnings (loss)		200.5		47.6		14.1		(34.1	)		—			228.1
Capital expenditures		588.6		0.4		73.6		(0.1	)		—			662.5

	Gas		Gas
2022	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	1,945.6	$	234.9	$	17.4	$	0.6		$	—		$	2,198.5
Intersegment revenues		0.5		—		35.7		15.5			(51.7	)		—
Total Operating Revenues		1,946.1		234.9		53.1		16.1			(51.7	)		2,198.5
Depreciation and amortization expense		227.9		1.4		7.5		0.5			—			237.3
Interest expense		86.4		—		4.9		37.3			(8.8	)		119.8
Income tax expense (benefit)		49.6		11.9		4.5		(7.1	)		—			58.9
Net economic earnings (loss)		202.7		27.0		11.1		(24.5	)		—			216.3
Capital expenditures		528.6		0.9		22.6		0.1			—			552.2

	Gas		Gas
2021	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,118.2	$	96.5	$	19.9	$	0.9		$	—		$	2,235.5
Intersegment revenues		1.1		—		32.7		14.2			(48.0	)		—
Total Operating Revenues		2,119.3		96.5		52.6		15.1			(48.0	)		2,235.5
Depreciation and amortization expense		204.4		1.2		6.9		0.6			—			213.1
Interest expense		74.7		—		4.0		29.3			(1.4	)		106.6
Income tax expense (benefit)		56.9		13.4		4.4		(6.2	)		—			68.5
Net economic earnings (loss)		230.6		47.0		11.1		(22.4	)		—			266.3
Capital expenditures		590.4		0.7		33.0		0.7			—			624.8

110

 

Total Assets at End of Year	2023			2022			2021
Gas Utility	$	8,486.7		$	8,042.8		$	7,615.4
Gas Marketing		332.0			638.7			466.1
Midstream		574.3			446.0			413.8
Other		2,533.3			2,705.5			2,193.3
Eliminations		(1,612.7	)		(1,749.3	)		(1,332.2	)
Total Assets	$	10,313.6		$	10,083.7		$	9,356.4

Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings	2023			2022			2021
Net Income	$	217.5		$	220.8		$	271.7
Adjustments, pre-tax:
Missouri regulatory adjustments		—			—			(9.0	)
Fair value and timing adjustments		11.4			(11.4	)		3.3
Acquisition and divestiture activities		2.5			—			(1.3	)
Income tax adjustments		(3.3	)		6.9			1.6
Net Economic Earnings	$	228.1		$	216.3		$	266.3

15. REGULATORY MATTERS

As discussed below for Spire Missouri and Spire Alabama, the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and regulatory liabilities related to the PGA clauses and the GSA rider are both labeled Unamortized Purchased Gas Adjustments herein.

111

 

The following regulatory assets and regulatory liabilities were reflected in the balance sheets of the Company, Spire Missouri and Spire Alabama as of September 30, 2023 and 2022.

	Spire				Spire Missouri				Spire Alabama
September 30	2023		2022		2023		2022		2023		2022
Regulatory Assets:
Current:
Unamortized purchased gas adjustments	$	293.2	$	322.2	$	269.4	$	275.1	$	21.7	$	43.8
Other		55.1		33.2		23.7		13.0		19.9		13.1
Total Current Regulatory Assets		348.3		355.4		293.1		288.1		41.6		56.9
Noncurrent:
Future income taxes due from customers		144.5		137.8		136.2		129.2		2.0		2.2
Pension and postretirement benefit costs		261.0		294.5		189.1		222.9		67.8		66.5
Cost of removal		633.2		493.7		97.0		25.2		536.2		468.5
Unamortized purchased gas adjustments		23.0		—		23.0		—		—		—
Energy efficiency		56.3		57.2		56.3		57.2		—		—
Other		131.2		129.2		116.0		113.1		0.9		1.0
Total Noncurrent Regulatory Assets		1,249.2		1,112.4		617.6		547.6		606.9		538.2
Total Regulatory Assets	$	1,597.5	$	1,467.8	$	910.7	$	835.7	$	648.5	$	595.1
Regulatory Liabilities:
Current:
Other	$	7.3	$	3.7	$	—	$	—	$	—	$	—
Total Current Regulatory Liabilities		7.3		3.7		—		—		—		—
Noncurrent:
Deferred taxes due to customers		128.0		145.3		114.8		127.9		—		—
Pension and postretirement benefit costs		185.2		172.6		156.5		143.6		17.9		19.4
Accrued cost of removal		126.6		32.9		90.4		—		—		—
Unamortized purchased gas adjustments		11.2		53.0		11.2		53.0		—		—
Other		21.4		14.4		16.5		7.3		3.3		3.6
Total Noncurrent Regulatory Liabilities		472.4		418.2		389.4		331.8		21.2		23.0
Total Regulatory Liabilities	$	479.7	$	421.9	$	389.4	$	331.8	$	21.2	$	23.0

A portion of the Company’s and Spire Missouri's regulatory assets are not earning a return, as shown in the table below:

	Spire				Spire Missouri
September 30	2023		2022		2023		2022
Pension and postretirement benefit costs	$	133.4	$	152.9	$	133.4	$	152.9
Future income taxes due from customers		142.5		135.6		136.2		129.2
Unamortized purchase gas adjustments		292.4		275.1		292.4		275.1
Other		104.2		122.7		104.2		122.7
Total Regulatory Assets Not Earning a Return	$	672.5	$	686.3	$	666.2	$	679.9

Like all the Company’s regulatory assets, these regulatory assets as of September 30, 2023 are expected to be recovered from customers in future rates. The recovery period for the future income taxes due from customers and pension and other postretirement benefit costs could be 20 years or longer, based on current Internal Revenue Service guidelines and average remaining service life of active participants, respectively. The recovery period for the PGA assets is less than two years. The other items not earning a return are expected to be recovered over a period not to exceed 15 years, consistent with precedent set by the MoPSC, except for certain debt costs expected to be recovered over the related debt term, up to 35 years. Spire Alabama does not have any regulatory assets that are not earning a return.

112

 

Spire Missouri

As authorized by the MoPSC, the PGA clause allows Spire Missouri to flow through to customers, subject to prudence review by the MoPSC, the cost of purchased gas supplies. To better match customer billings with market natural gas prices, Spire Missouri is allowed to file to modify, on a periodic basis, the level of gas costs in its PGA. Certain provisions of the PGA clause are included below:

•  Spire Missouri has a risk management policy that allows for the purchase of natural gas derivative instruments with the goal of managing price risk associated with purchasing natural gas on behalf of its customers. The MoPSC clarified that costs, cost reductions, and carrying costs associated with the Utility’s use of natural gas derivative instruments are gas costs recoverable through the PGA mechanism.

•  The tariffs allow Spire Missouri flexibility to make up to three discretionary PGA changes during each year, in addition to its mandatory November PGA change, so long as such changes are separated by at least two months.

•  Spire Missouri is authorized to apply carrying costs to all over- or under-recoveries of gas costs, including cost increases and cost reductions associated with the use of derivative instruments, including cash payments for margin deposits.

•  Pre-tax income from off-system sales and capacity release revenues is shared with customers (such that customers receive 75% and Spire Missouri receives 25%).

Pursuant to the provisions of the PGA clause, the difference between actual costs incurred and costs recovered through the application of the PGA clause, as well as the actual amount of off-system sales and capacity release revenues allocated to customers, are reflected as a regulatory asset or liability at the end of the fiscal year. At that time, the balance is classified as a current asset or current liability and recovered from, or credited to, customers over an annual period commencing in the subsequent November. The balance in the current account is amortized as amounts are reflected in customer billings. In fiscal 2023, Spire Missouri filed two changes to its tariff, which were approved and became effective November 29, 2022 and January 19, 2023. 

In mid- February 2021, the central U.S. experienced a period of unusually severe cold weather (“Winter Storm Uri”), and Spire Missouri implemented an Operational Flow Order (OFO) to preserve the integrity of its distribution system. During this time, Spire Missouri was required to purchase additional natural gas supply, both to ensure adequate supply for its firm utility customers, and to cover the shortfall created when third-party marketers failed to deliver natural gas supply to its city gates on behalf of their customers. In accordance with its MoPSC-approved OFO tariff, Spire Missouri invoiced the cost of gas and associated penalties totaling $195.8 to non-compliant marketers and recorded accounts receivable. Recoveries collected are an offset to cost of natural gas for firm utility customers through the PGA and Actual Cost Adjustment (ACA), so are net income neutral to Spire Missouri. The three largest counterparties did not remit payment when due, so Spire Missouri filed suit against them in federal court to recover the invoiced amounts. In late February 2022, the parties to the OFO waiver suits agreed to a settlement in principle, pursuant to which marketers will reimburse Spire Missouri for the actual cost of its incremental gas purchases to serve marketers’ customers during Winter Storm Uri, so Spire Missouri reduced revenue, accounts receivable, cost of gas and regulatory liabilities by approximately $150 in the second quarter of fiscal 2022. The settlement, which reduced the total amount due from the three marketers to approximately $42, was approved by the MoPSC in late May 2022, and the marketers are making timely payments to Spire Missouri.

As a result of the significant net deferred gas costs and average inventory cost in the second quarter of fiscal 2021, primarily due to Winter Storm Uri, Spire Missouri filed for and received MoPSC approval for an adjustment to the PGA tariff to increase a Filing Adjustment Factor (FAF) credit on customers' bills for three years. This lowered the net PGA rate to mitigate the impact of Winter Storm Uri costs on customers. All gas costs will eventually be recovered by Spire Missouri through the PGA or ACA mechanisms and carrying costs will be applied per the terms of the tariff.

In the first quarter of fiscal 2022, the MoPSC approved Spire Missouri compliance tariffs with an effective date of December 23, 2021, consistent with its order in Spire Missouri’s general rate case. These new tariffs were designed to increase Spire Missouri’s aggregate annual gross base rate revenues by $72.2, which includes $24.9 incremental and $47.3 already being collected through the Infrastructure System Replacement Surcharge (ISRS). The MoPSC required Spire Missouri to defer all non-operational overheads from December 23, 2021 through September 30, 2022 into a regulatory asset totaling $42.8. On April 1, 2022, Spire Missouri filed tariff sheets to initiate a new general rate case proceeding intended to address the deferred amounts, along with other matters. The parties reached a Full Unanimous Stipulation and Agreement (the “Stipulation”) to resolve all issues in the case, which was filed with the MoPSC on November 4, 2022. On November 18, 2022, the Stipulation was approved, including authorization of $78.0 in new base rate revenue (including $19.0 already being collected through ISRS) and recovery of deferred overheads through amortization of the related regulatory asset. New base rates became effective on December 26, 2022.

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ISRS allows Spire Missouri expedited recovery for its investment to replace qualifying components of its infrastructure without the necessity of a formal rate case. As noted above, all prior ISRS revenues were reset to zero as of December 26, 2022 as a result of Spire Missouri's most recent base rate case. On April 20, 2023, the MoPSC approved an incremental annual ISRS revenue increase of $7.7, effective May 6, 2023, reflecting eligible pipe replacement from October 2022 through February 2023. On October 4, 2023, the MoPSC approved an incremental annual ISRS revenue increase of $12.4, effective October 23, 2023, reflecting eligible pipe replacement from March 2023 through August 2023.

On May 27, 2022, the MoPSC staff filed an ACA Review Recommendation and Report for the ACA period that first includes transportation charges incurred by Spire Missouri for service on the Spire STL Pipeline. That report concluded that the transaction complied with Missouri affiliate transaction rules and was prudent, and it recommended no disallowance of any Spire STL Pipeline related costs from the ACA mechanism. On July 11, 2022, Spire Missouri filed its response comments in support of the recommendation. The Missouri Office of the Public Counsel and Environmental Defense Fund (EDF) filed comments on July 29 and August 1, 2022, respectively, raising concerns about the Spire STL Pipeline transaction, the ACA process itself, and other matters. On January 6, 2023, Spire Missouri filed a Partial Stipulation and Agreement resolving all other issues raised by the MoPSC staff in its Recommendation and Report. The partial stipulation was approved by the MoPSC on January 25, 2023, resulting in a $0.6 credit to the ACA balance, but issues relating to Spire STL Pipeline costs remained contested. An evidentiary hearing on this matter was scheduled to be held  July 25-26, 2023; however, on July 21, 2023, MoPSC suspended the procedural schedule in recognition that the parties had reached an agreement in principle to resolve the matter via settlement stipulation. The stipulation and agreement was approved by the Commission on August 23, 2023 and included an increase in customer assistance program funding among other non-monetary commitments.

In 2022, the MoPSC initiated their annual ACA dockets (GR-2022-0135 and GR-2022-0136) to audit gas commodity and transportation costs for the 2020-2021 heating season, which included the impact of Winter Storm Uri on Spire Missouri's natural gas portfolio. On December 15, 2022, the MoPSC staff filed its Reports and Recommendations in these cases proposing various disallowances relating to imbalance cash-outs and an off-system sale. On January 19, 2023, Spire Missouri filed its response to this proposal setting forth its position that there is no basis in law or fact for either disallowance. On July 12, 2023, the MoPSC entered a scheduling order in this matter which includes several rounds of pre-filed testimony prior to an evidentiary hearing to be held in early May 2024. On November 2, 2023, Spire Missouri filed an unopposed settlement stipulation by which the MoPSC Staff agreed to withdraw its recommendation of a proposed disallowance relating to imbalance cash-outs. The proposed disallowance relating to an off-system sale remains pending in the case. Management believes the likelihood of an unfavorable outcome is remote.

Spire Alabama

In September 2022, the APSC approved the renewal of RSE through September 30, 2025, with certain modifications to the previous terms. Under RSE, the APSC conducts reviews in March, June and September to determine whether Spire Alabama’s return on average common equity (ROE) at the end of the rate year will be within the allowed range of return. Reductions in rates can be made quarterly to bring the projected ROE within the allowed range; increases, however, are allowed only once each rate year, effective December 1, and cannot exceed 4% of prior-year revenues. Effective October 1, 2022, Spire Alabama's allowed range of ROE is 9.50% to 9.90% with an adjusting point of 9.70%. Previously, the allowed range was 10.15% to 10.65% with an adjusting point of 10.40%. Spire Alabama is subject to a performance-based adjustment of plus or minus 10 basis points to the ROE adjusting point, based upon the terms of the previously approved Accelerated Infrastructure Modernization (AIM) Program tariff; however, Spire applied for and received approval to suspend the operation of the AIM performance-based adjustment for 2022, 2023, and 2024, impacting fiscal years 2023 through 2025. Spire Alabama’s equity as a percent of total capitalization is limited to 55.5%, and Average Common Equity growth is limited to 6.00% each year.

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The inflation-based Cost Control Measure (CCM) established by the APSC allows for annual changes in operation and maintenance (“O&M”) expense relative to an index range. Effective October 1, 2022, the Base Year O&M expense was computed by averaging the actual O&M expenses for 2020, 2021, and 2022. The Base CPI-U was computed by averaging the August CPI-U for 2020, 2021, 2022. The “Index” is computed by measuring the change from the Base CPI-U to the August CPI-U of the most recently completed fiscal year, less a factor of 1.50%. The index range will be computed by adjusting the Index plus or minus 1.50%. If rate year O&M expense falls within the index range, no adjustment is required. If rate year O&M expense exceeds the index range, three-quarters of the difference is returned to customers through future rate adjustments. To the extent rate year O&M is less than the index range, Spire Alabama benefits by one-half of the difference through future rate adjustments. If a benefit is achieved, the Base Year and the Base CPI-U for the following year will each be reset to an average of the three preceding completed years. If a benefit is not achieved, the Base Year and Base CPI-U will not be updated. Certain items that fluctuate based on situations demonstrated to be beyond Spire Alabama’s control may be excluded from the CCM calculation.

The RSE reduction for September 30, 2021 following the year-end point of test was $2.2 to bring the expected rate of return on average common equity to within the allowed rate of return. The CCM benefit for rate year 2021 was $8.8. To mitigate the impact on ratepayers, Spire Alabama requested and received approval from the APSC to recover the 2021 CCM benefit over five years (with recognition of revenue only up to 24 months in advance of recovery). As a part of the annual update for RSE, on December 29, 2021, Spire Alabama filed an increase for rate year 2022 of $5.3. The 2021 RSE reduction of $2.2, the five-year recovery of the 2021 CCM benefit of $8.8 and the annual RSE increase of $5.3 were all effective on January 1, 2022. There was no RSE reduction in 2022 for the January 31, April 30, July 31 or September 30 quarterly points of test. Spire Alabama recorded a CCM benefit for rate year 2022 of $17.2. Similar to the rate year 2021 CCM benefit, Spire requested and received approval to recover the rate year 2022 CCM benefit over five years. On October 26, 2022, Spire Alabama made its annual RSE rate filing with the APSC, presenting the utility’s budget for the fiscal year ended September 30, 2023, including net income and a calculation of allowed ROE. The budget reflected the start of amortization of the accumulated deferred income tax (ADIT) adjustment related to the Tax Cuts and Jobs Act of 2017 (TCJA). New rates designed to provide an annual revenue increase of $15.0 became effective January 1, 2023. There was no RSE reduction in 2023 for the March 31, June 30 or September 30 points of test. Spire Alabama recorded a CCM benefit for rate year 2023 of $4.4. On October 26, 2023, Spire Alabama made its annual RSE rate filing, presenting the utility’s budget for the fiscal year ending September 30, 2024, including net income and a calculation of allowed ROE. New rates designed to provide an annual revenue increase of $15.8 are anticipated to become effective December 1, 2023.

Spire Alabama’s rate schedules for natural gas distribution charges contain a GSA rider which permits the pass-through to customers of changes in the cost of gas supply. Spire Alabama’s tariff provides a temperature adjustment mechanism, also included in the GSA rider, which is designed to moderate the impact of departures from normal temperatures on Spire Alabama’s earnings. The temperature adjustment applies primarily to residential, small commercial and small industrial customers. Other non-temperature weather-related conditions that may affect customer usage are not included in the temperature adjustment. There is also a mechanism under Spire Alabama's GSA rider allowing the utility to create value through off-system sales of excess natural gas supply and capacity and to give 75% of the value created to customers while retaining 25%. As of April 2022, the first $1.6 of value from capacity release goes entirely to customers before Spire Alabama retains 25%. In the past year, Spire Alabama filed GSA rate increases effective December 1, 2022 and  January 1, 2023, and GSA rate decreases effective October 1, 2023 and anticipated to become effective December 1, 2023, primarily attributable to changes in natural gas prices.

The APSC approved an Enhanced Stability Reserve (ESR) in 1998, which was subsequently modified and expanded in 2010. As currently approved, the ESR provides deferred treatment and recovery for the following: (1) extraordinary O&M expenses related to environmental response costs; (2) extraordinary O&M expenses related to self-insurance costs that exceed $1.0 per occurrence; (3) extraordinary O&M expenses, other than environmental response costs and self-insurance costs, resulting from a single force majeure event or multiple force majeure events greater than $0.3 and $0.4, respectively, during a rate year; and (4) negative individual large commercial and industrial customer budget revenue variances that exceed $0.4 during a rate year. Charges to the ESR are subject to certain limitations which may disallow deferred treatment and which prescribe the timing of recovery. Subject to APSC authorization, Spire Alabama expects to be able to recover underfunded ESR balances over a five-year amortization period with an annual limitation of $0.7. Amounts in excess of this limitation are deferred for recovery in future years.

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Spire

In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is affected by the following regulatory matters.

Spire Gulf has similar rate regulation to Spire Alabama. Its RSE rate-setting mechanism was renewed in September 2021 for a four-year term through September 2025. The RSE allowed ROE range was 10.45% to 10.95% with an adjusting point of 10.70% in fiscal 2021, while the ROE range is 9.70% to 10.30% with an adjusting point of 9.95% for fiscal 2022 through fiscal 2025. In October 2021 and 2022, Spire Gulf made its annual RSE rate filings with the APSC based on its budget for the new fiscal year and an allowed ROE of 9.95%, and new rates designed to provide increased annual revenues of $1.0 and $2.5 became effective at the beginning of January 2022 and 2023, respectively. The fiscal 2023 budget reflected the start of amortization of the excess ADIT from the TCJA. Spire Gulf filed its RSE point of test as of April 30, 2023 with the APSC reflecting that its projected ROE exceeded the allowed ROE resulting in an annualized refund of $1.8 that became effective July 1, 2023. Spire Gulf filed its RSE point of test as of September 30, 2023, reflecting that its actual ROE exceeded the allowed ROE resulting in an additional annualized refund of $2.0 that are anticipated to become effective December 1, 2023. The CCM has similar evaluation and recovery provisions when expenses exceed or are under a band of plus or minus 1.50% around the CPI-U inflated O&M per customer expense level from the base year, excluding expenses for pensions and gas bad debt. The base year for the O&M index was 2017 for fiscal 2021 and was 2021 for fiscal 2022. Since a CCM benefit was recorded in fiscal 2022, the base year O&M index for fiscal 2023 through fiscal 2025 will be the 2022 O&M level. Spire Gulf recorded a CCM benefit for rate year 2021 of $2.3 to revenues, resulting in a net income benefit of $1.6. A CCM benefit of $1.7 was recorded for fiscal 2022 to an economic development fund that can be used for economic development purposes subject to APSC approval. Spire Gulf’s O&M for fiscal 2023 was within the O&M per customer inflation adjusted band. Spire Gulf has a Cast Iron Main Replacement Factor (CIF) that provides an enhanced return on the pro-rata costs associated with cast iron main replacement exceeding 10 miles per year based on a 75% weighting for the equity content. Capital expenditures recovered under the CIF have not increased since fiscal 2019 pursuant to applicable tariff provisions although the Company is continuing to recover costs of service associated with accumulated expenditures under the CIF. Spire Gulf also has an ESR for negative revenue variances over $0.1 or a force majeure event expense of $0.1 (or two events that exceed $0.15) and an Environmental Cost Recovery Factor that recovers 90% of prudently incurred costs for compliance with environmental laws, rules and regulations. Spire Gulf has an APSC-approved intercompany revolving credit agreement with Spire to borrow in a principal amount not to exceed $75.0 and to loan up to $25.0.

Spire Mississippi utilizes a formula rate-making process under the Rate Stabilization Adjustment Rider (RSA). An allowed return on equity (currently 10.04%) is computed annually and compared to the actual return on equity based on a rate year ending June 30. If the actual equity return on an end of period rate base is beyond the allowed return on equity by 1.0%, then 75% of any shortfall is recovered through a rate increase and 50% of any excess results in a rate decrease. Updates may include known and measurable adjustments to historic costs from the 12 months ended June 30, submitted September 15 for an effective date of November 1, unless disputed by the Mississippi Public Utilities Staff (MPUS), with any disputes to be resolved by the Mississippi Public Service Commission (MSPSC) by January 15 of the following year. The MSPSC approved stipulation agreements between the MPUS and Spire Mississippi that provided for increased annual revenues of $0.8 through rates effective on February 1, 2022 and an additional $0.8 effective on January 1, 2023. Spire Mississippi’s RSA filing made on September 1, 2023 reflected a rate increase of $1.3 and is pending review by the MPUS. Additionally, a Supplemental Growth Rider provides recovery of certain Spire Mississippi system expansion projects to serve qualified economic development projects.

In August 2018, the FERC approved an order issuing Certificates of Public Convenience and Necessity (“FERC Certificates”) for the Spire STL Pipeline ( “August 2018 Order”). In  June 2021, the U.S. Court of Appeals for the District of Columbia Circuit issued an order vacating the FERC Certificates and remanding the matter back to the FERC for further action. In  September and December 2021, the FERC issued temporary certificates for the continued authorized operation of the Spire STL Pipeline pending the outcome of its determination on remand. On December 15, 2022, the FERC issued its order on remand reissuing permanent FERC Certificates for the continued operation of the Spire STL Pipeline, and that order is final and no longer appealable.

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16. COMMITMENTS AND CONTINGENCIES

Commitments

The Company and the Utilities have entered into contracts with various counterparties, expiring on dates through calendar 2039, for the storage, transportation, and supply of natural gas. Minimum payments required under the contracts in place at September 30, 2023, are estimated at $1,613.2, $1,182.0 and $251.6 for the Company, Spire Missouri and Spire Alabama, respectively. Additional contracts are generally entered into prior to or during the heating season of November through April. The Utilities recover their costs from customers in accordance with their PGA clauses or GSA riders.

In May 2023, Spire entered into an agreement to acquire MoGas Pipeline, an interstate natural gas pipeline, and Omega Pipeline, a connected gas distribution system, from CorEnergy Infrastructure Trust, Inc., for $175 cash, subject to customary working capital and other closing adjustments. Spire has received a request for additional information ("Second Request") from the Federal Trade Commission (FTC) with regard to this proposed acquisition. The Company is cooperating fully with the FTC regarding the Second Request and expects to close in the second quarter of fiscal 2024 subject to receiving FTC approval. 

A consolidated subsidiary of Spire is a limited partner in Inter-Atlantic Energy Capital Ventures, L.P., an unconsolidated partnership focusing on sustainability initiatives largely tied to the natural gas utility sector. Spire committed to contribute a total of $10.0 of capital to the partnership as and when requested by the general partner. As of September 30, 2023, the remaining unfunded commitment was $4.9.

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Contingencies

The Company and the Utilities account for contingencies, including environmental liabilities, in accordance with accounting standards under the loss contingency guidance of ASC Topic 450, Contingencies, when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

In addition to matters noted below, the Company and the Utilities are involved in other litigation, claims, and investigations arising in the normal course of business. Management, after discussion with counsel, believes the final outcome will not have a material effect on the statements of income, balance sheets, and statements of cash flows of the Company, Spire Missouri, or Spire Alabama. However, there is uncertainty in the valuation of pending claims and prediction of litigation results.

The Company and the Utilities own and operate natural gas distribution, transmission, and storage facilities, the operations of which are subject to various environmental laws, regulations, and interpretations. While environmental issues resulting from such operations arise in the ordinary course of business, such issues have not materially affected the Company’s or Utilities’ financial position and results of operations. As environmental laws, regulations, and their interpretations change, the Company or the Utilities may incur additional environmental liabilities that may result in additional costs, which may be material.

In the natural gas industry, many gas distribution companies have incurred environmental liabilities associated with sites they or their predecessor companies formerly owned or operated where manufactured gas operations took place. The Utilities each have former manufactured gas plant (MGP) operations in their respective service territories, some of which are discussed under the Spire Missouri and Spire Alabama headings below. To the extent costs are incurred associated with environmental remediation activities, the Utilities would request authority from their respective regulators to defer such costs (less any amounts received from insurance proceeds or as contributions from other potentially responsible parties (PRPs)) and collect them through future rates.

To date, costs incurred for all Spire MGP sites for investigation, remediation and monitoring have not been material. However, the amount of costs relative to future remedial actions at these and other sites is unknown and may be material. The actual future costs that Spire Missouri and Spire Alabama may incur could be materially higher or lower depending upon several factors, including whether remediation will be required, final selection and regulatory approval of any remedial actions, changing technologies and government regulations, the ultimate ability of other PRPs to pay, and any insurance recoveries.

In 2020, Spire retained an outside consultant to conduct probabilistic cost modeling of its former MGP sites in Missouri and Alabama. The purpose of this analysis was to develop an estimated range of probabilistic future liability for each of their MGP sites. That analysis, completed in March 2021, provided a range of demonstrated possible future expenditures to investigate, monitor and remediate the former MGP sites. Spire Missouri and Spire Alabama have recorded their best estimates of the probable expenditures that relate to these matters. The amount remains immaterial, and Spire Missouri, Spire Alabama and the Company do not expect potential liabilities that may arise from remediating these sites to have a material impact on their future financial condition or results of operations.

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Spire Missouri

Spire Missouri has identified three former MGP sites in the city of St. Louis, Missouri (the “City”) where costs have been incurred and claims have been asserted. Spire Missouri has enrolled two of the sites in the Missouri Department of Natural Resources (MoDNR) Brownfields/Voluntary Cleanup Program (BVCP). The third site is the result of an assertion by the United States Environmental Protection Agency (EPA).

In conjunction with redevelopment of the Carondelet Coke site, Spire Missouri and another former owner of the site entered into an agreement (the “Remediation Agreement”) with the City development agencies, the developer, and an environmental consultant that obligates one of the City agencies and the environmental consultant to remediate the site and obtain a No Further Action (NFA) letter from the MoDNR. The Remediation Agreement also provides for a release of Spire Missouri and the other former site owner from certain liabilities related to the past and current environmental condition of the site and requires the developer and the environmental consultant to maintain certain insurance coverage, including remediation cost containment, premises pollution liability, and professional liability. The operative provisions of the Remediation Agreement were triggered on December 20, 2010, on which date Spire Missouri and the other former site owner, as full consideration under the Remediation Agreement, paid a small percentage of the cost of remediation of the site. The property was divided into seven parcels, and MoDNR NFA letters have been received for six of the parcels. Remediation is ongoing on the last parcel.

In a letter dated June 29, 2011, the Attorney General for the State of Missouri informed Spire Missouri that the MoDNR had completed an investigation of the second site, Station A. The Attorney General requested that Spire Missouri participate in the follow up investigations of the site. In a letter dated January 10, 2012, Spire Missouri stated that it would participate in future environmental response activities at the site in conjunction with other PRPs. Accordingly, Spire Missouri entered into a cost sharing agreement for remedial investigation with other PRPs. MoDNR never approved the agreement, so no remedial investigation took place. Recently, Spire Missouri was approached by a real estate developer interested in purchasing the northern half of the Station A site and developing the same for industrial purposes. Consequently, Spire Missouri is now in discussions with the developer, other PRPs and MoDNR to develop a new remedial investigation plan for the site.

Additionally, in correspondence dated November 30, 2016, Region 7 of the EPA has asserted that Spire Missouri is liable under Section 107(a) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) for alleged coal gas waste contamination at a third site, Station B. Spire Missouri and the site owner notified the EPA that information and data provided by the EPA to date does not rise to the level of documenting a threat to the public health or environment. As such, in March 2017 Spire Missouri requested more information from the EPA. Spire Missouri never received a response from the EPA.

Spire Missouri has notified its insurers that it seeks reimbursement for costs incurred in the past and future potential liabilities associated with these MGP sites. While some of the insurers have denied coverage and reserved their rights, Spire Missouri retains the right to seek potential reimbursements from them.

On March 10, 2015, Spire Missouri received a Section 104(e) information request under CERCLA from EPA Region 7 regarding the former Thompson Chemical/Superior Solvents site in the City. In turn, Spire Missouri issued a Freedom of Information Act (FOIA) request to the EPA on April 3, 2015, to identify the basis of the inquiry. The FOIA response from the EPA was received on July 15, 2015, and a response was provided to the EPA on August 15, 2015. Spire Missouri has received no further inquiry from the EPA regarding this matter.

In its western service area, Spire Missouri has six owned MGP sites enrolled in the BVCP, including Joplin MGP #1, St. Joseph MGP #1, Kansas City Coal Gas Station B, Kansas City Station A Railroad area, Kansas City Coal Gas Station A, and Independence MGP #2. Source removal has been conducted at all the owned sites since 2003 with the exception of Joplin. On September 15, 2016, a request was made with the MoDNR for a restrictive covenant use limitation with respect to Joplin. Remediation efforts at the six sites are at various stages of completion, ranging from groundwater monitoring and sampling following source removal activities to the aforementioned request for the Joplin site. As part of its participation in the BVCP, Spire Missouri communicates regularly with the MoDNR with respect to its remediation efforts and monitoring activities at these sites. On May 11, 2015, MoDNR approved the next phase of investigation at the Kansas City Station A Railroad area.

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Spire Alabama

Spire Alabama is in the chain of title of nine former MGP sites, four of which it still owns, and five former manufactured gas distribution sites, one of which it still owns. All are located in the state of Alabama.

In 2011, a removal action was completed and an NFA letter was received at the Huntsville MGP site pursuant to an Administrative Settlement Agreement and Order on Consent among the EPA, Spire Alabama and the current site owner.

In 2012, Spire Alabama responded to an EPA Request for Information Pursuant to Section 104 of CERCLA relating to the 35th Avenue Superfund Site located in North Birmingham, Jefferson County, Alabama. Spire Alabama was identified as a PRP under CERCLA for the cleanup of the site or costs the EPA incurs in cleaning up the site. At this point, Spire Alabama has not been provided information that would allow it to determine the extent, if any, of its potential liability with respect to the 35th Avenue Superfund Site and vigorously denies its inclusion as a PRP.

Assessments were performed by the EPA of the former MGP sites in Gadsden and Anniston, and NFA letters were received after each assessment.

Spire

In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is aware of the following contingent matters.

Spire Marketing, along with many natural gas industry participants, faced the unprecedented effects of Winter Storm Uri in February 2021. Numerous natural gas producers and midstream operators were unable to deliver natural gas to market as they experienced wellhead freeze-offs, power outages and equipment failure due to the extreme weather. These events resulted in supply curtailments, and related notices of force majeure to excuse performance, from and to certain counterparties. Further, these events have made Spire Marketing subject to various commercial disputes (including regarding force majeure). As such, Spire Marketing has recorded an estimate of potential liabilities for damages based on communications with counterparties and the facts and circumstances surrounding each transaction. These estimates are adjusted as new facts emerge or settlement agreements are reached, and it is possible that final settlement amounts may materially differ from the current estimate.

17. LEASES

The lease agreement covering the Company’s primary office space in St. Louis extends through February 2035, with an option to renew for an additional five years. Spire Alabama’s lease agreement for office space in Birmingham extends through January 2037, with an option to renew for two additional five-year terms. The lease agreement covering Spire Marketing and Spire Storage office space in Houston extends through December 2028, with options to terminate three years earlier or to renew for an additional five years. The renewal options in the St. Louis and Houston leases are reasonably certain to be exercised and are included in the lease term used to determine the right-of-use assets and lease liabilities. The Company and its subsidiaries have other relatively minor rental arrangements for real estate and equipment with remaining terms of up to ten years.

Operating lease cost, cash flow and noncash information are shown in the following table.

	Spire						Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021		2023		2022		2021
Operating lease cost, including amounts capitalized	$	7.3	$	7.4	$	7.2	$	0.5	$	0.5	$	0.4	$	2.0	$	2.1	$	2.1
Cash flow and noncash information about operating leases:
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities		7.3		7.3		7.2		0.5		0.5		0.4		2.1		2.1		2.1
Right-of-use assets obtained in exchange for lease liabilities		0.8		24.6		—		0.8		1.1		—		—		23.5		—

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The following table shows year-end balance sheet and weighted-average information about operating leases.

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Right-of-use assets	$	70.6		$	73.7		$	2.1		$	1.7		$	19.2		$	20.2
Lease liabilities, current		6.8			6.5			0.5			0.4			1.9			1.9
Lease liabilities, noncurrent		70.2			73.7			1.8			1.5			23.5			24.6
Weighted-average remaining lease term (in years)		14.1			15.0			5.6			5.1			13.3			14.3
Weighted-average discount rate		4.2	%		4.1	%		3.3	%		2.2	%		3.7	%		3.7	%

On the balance sheets, right-of-use assets are included in “Deferred Charges and Other Assets: Other,” current lease liabilities are in “Current Liabilities: Other,” and noncurrent lease liabilities are in “Deferred Credits and Other Liabilities: Other.”

Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2023.

	Spire			Spire Missouri			Spire Alabama
2024	$	6.9		$	0.5		$	1.9
2025		7.5			0.6			2.2
2026		7.5			0.4			2.2
2027		7.4			0.3			2.3
2028		7.4			0.3			2.3
Thereafter		65.9			0.5			21.7
Total undiscounted lease payments		102.6			2.6			32.6
Less present value discount		(25.6	)		(0.3	)		(7.2	)
Total current and noncurrent lease liabilities	$	77.0		$	2.3		$	25.4

There are no significant finance leases, short-term leases, subleases, variable lease payments, residual value guarantees, restrictions or covenants pertaining to leases.

The Company elected, for all asset classes, not to recognize right-of-use assets and lease liabilities for short-term leases. Instead, the lease payments for short-term leases are recognized in profit or loss on a straight-line basis over the lease term and variable lease payments are recognized in the period in which the obligation for those payments is incurred. The Company elected, for all asset classes, not to separate nonlease components from lease components and instead to account for each separate lease component and the nonlease components associated with that lease component as a single lease component.

The discount rate used for all the leases is the applicable incremental borrowing rate, which is the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. For a subsidiary lessee, the rate applicable to the subsidiary is used unless the lease terms are influenced by parent credit.

121

 

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

There have been no changes in or disagreements on accounting and financial disclosure with Spire’s, Spire Missouri’s, or Spire Alabama’s outside auditors that are required to be disclosed.

Item 9A. Controls and Procedures

Spire

Management Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal controls over financial reporting. Spire Inc.’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements and can provide only reasonable assurance with respect to financial statement preparation and presentation. Also, projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Spire Inc.’s management, including its Chief Executive Officer and Chief Financial Officer, conducted an assessment of the effectiveness of Spire Inc.’s internal control over financial reporting as of September 30, 2023. In making this assessment, management used the criteria in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on that assessment, management concluded that Spire Inc.’s internal control over financial reporting was effective as of September 30, 2023. Deloitte & Touche LLP, an independent registered public accounting firm, has issued an attestation report on Spire Inc.’s internal control over financial reporting, which is included in Item 8, Financial Statements and Supplementary Data.

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended. Based upon such evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective.

Change in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during our fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Spire Missouri

Management Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal controls over financial reporting. Spire Missouri Inc.’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements and can provide only reasonable assurance with respect to financial statement preparation and presentation. Also, projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

122

Spire Missouri Inc.’s management, including its Chief Executive Officer and Chief Financial Officer, conducted an assessment of the effectiveness of Spire Missouri Inc.’s internal control over financial reporting as of September 30, 2023. In making this assessment, management used the criteria in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on that assessment, management concluded that Spire Missouri Inc.’s internal control over financial reporting was effective as of September 30, 2023.

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during our fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Spire Alabama

Management Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal controls over financial reporting. Spire Alabama Inc.’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements and can provide only reasonable assurance with respect to financial statement preparation and presentation. Also, projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Spire Alabama Inc.’s management, including its Chief Executive Officer and Chief Financial Officer, conducted an assessment of the effectiveness of Spire Alabama Inc.’s internal control over financial reporting as of September 30, 2023. In making this assessment, management used the criteria in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on that assessment, management concluded that Spire Alabama Inc.’s internal control over financial reporting was effective as of September 30, 2023.

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the disclosure controls and procedures pursuant to Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during our fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

123

Item 9B. Other Information

During the quarterly period ended September 30, 2023, no director or officer of the Company adopted or terminated any contract, instruction or written plan for the purchase or sale of securities of the Company intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act or any “non-Rule 10b5-1 trading arrangement” (as defined in the Exchange Act).

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

PART III

Item 10. Directors, Executive Officers and Corporate Governance

Information about:

•  our directors is incorporated by reference from the discussion under Proposal 1 of our proxy statement to be filed on or about December 13, 2023 (“2023 proxy statement”);

•  our executive officers is reported in Part I of this Form 10-K;

•  our Financial Code of Ethics is posted on our website, www.SpireEnergy.com, under Investors/Governance/Governance documents (http://investors.spireenergy.com/governance/governance-documents); and

•  our Audit Committee, our Audit Committee financial experts, and submitting nominations to the Corporate Governance Committee

is incorporated by reference from the discussion in our 2023 proxy statement under the heading “Governance.”

In addition, our Code of Business Conduct, Corporate Governance Guidelines, and charters for our Audit, Compensation and Corporate Governance Committees are available under “Governance documents” on our website, as indicated above, and a copy will be sent to any shareholder upon written request.

Item 11. Executive Compensation

Information about director and executive compensation is incorporated by reference from the discussion in our 2023 proxy statement under the headings “Directors’ compensation” and “Executive compensation.”

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Information about:

•  security ownership of certain beneficial owners and management and

•  aggregate information regarding the Company’s equity compensation plan

is incorporated by reference from the discussion in our 2023 proxy statement under “Beneficial ownership of Spire stock.”

Item 13. Certain Relationships and Related Transactions, and Director Independence

Information about:

•  our policy and procedures for related party transactions and

•  the independence of our directors

is included in our 2023 proxy statement under “Governance” and is incorporated by reference. There were no related party transactions in fiscal 2023.

Item 14. Principal Accounting Fees and Services

Information about fees paid to our independent registered public accountant and our policy for pre-approval of services provided by our independent registered public accountant is incorporated by reference from our 2023 proxy statement under “Fees of independent registered public accountant” and “Governance,” respectively.

124

PART IV

Item 15. Exhibits, Financial Statement Schedules

(a) (1) Financial Statements

See Item 8, Financial Statements and Supplementary Data, filed herewith, for a list of financial statements.

(2) Financial Statement Schedules

Schedules have been omitted because they are not applicable, related significance tests were not met, or the required data has been included in the financial statements or notes to financial statements.

(3) Exhibits

Exhibit Number	Description
2.01*	Agreement and Plan of Merger and Reorganization; filed as Appendix A to proxy statement/prospectus contained in the Company’s Registration Statement on Form S-4 filed October 27, 2000, No. 333-48794.
3.01*	Articles of Incorporation of Spire Inc., as amended, effective as of April 28, 2016; filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K on May 3, 2016.
3.02*	Amended Bylaws of Spire Inc., effective as of July 27, 2023; filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K on July 28, 2023.
3.03*	Spire Missouri Inc.’s Amended Articles of Incorporation, as amended, effective August 30, 2017; filed as Exhibit 3.1 to Spire Missouri’s Current Report on Form 8-K on September 1, 2017.
3.04*	Amended Bylaws of Spire Missouri Inc., effective as of March 26, 2020; filed as Exhibit 3.1 to Spire Missouri’s Current Report on Form 8-K on March 27, 2020.
3.05*	Articles of Amendment of the Articles of Incorporation of Spire Alabama Inc., dated September 1, 2017; filed as Exhibit 3.3 to Spire Alabama’s Current Report on Form 8-K filed September 1, 2017.
3.06*	Amended Bylaws of Spire Alabama Inc. effective March 26, 2020; filed as Exhibit 3.2 to Spire Alabama’s Current Report on Form 8-K on March 27, 2020.
3.07*	Certificate of Designations with respect to the Series A Preferred Stock, dated May 16, 2019; filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K on May 21, 2019.
4.01*3	Mortgage and Deed of Trust, dated as of February 1, 1945, between Laclede Gas Company and Mississippi Valley Trust Company; filed as Exhibit 4.10 to the Company's Registration Statement on Form S-3 (No. 333-264799) on May 9, 2022.
4.02*3	Fourteenth Supplemental Indenture, dated as of October 26, 1976, between Laclede Gas and Mercantile Trust Company National Association; filed as Exhibit 4.11 to the Company's Registration Statement on Form S-3 (No. 333-264799) on May 9, 2022.
4.03*†3	Laclede Gas Board of Directors’ Resolution dated August 28, 1986 which generally provides that the Board may delegate its authority in the adoption of certain employee benefit plan amendments to certain designated Executive Officers; filed as Exhibit 4.12 to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 1991.
4.04*†2	Indenture dated as of November 1, 1993, between Alagasco and NationsBank of Georgia, National Association, Trustee, (“Alagasco 1993 Indenture”); filed as Exhibit 4(k) to Alagasco’s Registration Statement on Form S-3 (Registration No. 33-70466).
4.05*3	Twenty-Fourth Supplemental Indenture, dated as of June 1, 1999, between Laclede Gas and State Street Bank and Trust Company of Missouri, N.A., as trustee; filed as Exhibit 4.01 to Laclede Gas’ Current Report on Form 8-K on June 4, 1999.
4.06*3	Twenty-Fifth Supplemental Indenture, dated as of September 15, 2000, between Laclede Gas and State Street Bank and Trust Company of Missouri, as trustee; filed as Exhibit 4.01 to Laclede Gas’ Current Report on Form 8-K on September 29, 2000.
4.07*3	Laclede Gas’ Board of Directors’ Resolutions dated March 27, 2003, updating authority delegated pursuant to August 28, 1986 Laclede Gas resolutions; filed as Exhibit 4.19(a) to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 2003.

125

Exhibit Number	Description
4.08*3	Twenty-Eighth Supplemental Indenture, dated as of April 15, 2004, between Laclede Gas and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.02 to Laclede Gas’ Current Report on Form 8-K on April 28, 2004.
4.09*3	Twenty-Ninth Supplemental Indenture, dated as of June 1, 2006, between Laclede Gas and UMB Bank and Trust, N.A., as trustee; filed as Exhibit 4.1 to Laclede Gas’ Current Report on Form 8-K on June 9, 2006.
4.10*2	Officers’ Certificate, dated January 16, 2007, pursuant to Section 301 of the Alagasco 1993 Indenture setting forth the terms of the 5.90 percent Notes due January 15, 2037; filed as Exhibit 4.2 to Alagasco’s Current Report on Form 8-K on January 16, 2007.
4.11*3	Thirty-First Supplemental Indenture, dated as of March 15, 2013, between Laclede Gas and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.1 to Laclede Gas’ Form 10-Q for the quarter ended March 31, 2013.
4.12*3	Thirty-Second Supplemental Indenture, dated as of August 13, 2013, between Laclede Gas and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.1 to Laclede Gas’ Current Report on Form 8-K on August 13, 2013.
4.13*	Indenture, dated as of August 19, 2014, between the Company and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K on August 19, 2014.
4.14*	First Supplemental Indenture, dated as of August 19, 2014, between the Company and UMB Bank & Trust, N.A., as trustee (including Form of Floating Rate Senior Notes due 2017, Form of 2.55% Senior Notes due 2019 and Form of 4.70% Senior Notes due 2044); filed as Exhibit 4.2 to the Company’s Current Report on Form 8-K on August 19, 2014.
4.15*2	Master Note Purchase Agreement, dated as of June 5, 2015, among Alagasco and certain institutional purchasers; filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015.
4.16*	Second Supplemental Indenture, dated as of February 27, 2017, between Spire Inc. and UMB Bank & Trust, N.A., as Trustee (including Form of 3.543% Senior Notes due 2024); filed as Exhibit 4.2 to the Company’s Current Report on Form 8-K on February 27, 2017.
4.17*	Master Note Purchase Agreement dated June 20, 2016, among Spire Inc. and certain institutional purchasers party thereto; filed as Exhibit 4.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017.
4.18*	First Supplement to Master Note Purchase Agreement dated as of March 15, 2017, among Spire Inc. and certain institutional purchasers party thereto; filed as Exhibit 4.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017.
4.19*3	Bond Purchase Agreement dated March 20, 2017, among Laclede Gas Company and certain institutional purchasers party thereto; filed as Exhibit 4.4 to the Laclede Gas’ Quarterly Report on Form 10-Q for the quarter ended March 31, 2017.
4.20*	First Supplement to Master Note Purchase Agreement, dated as of December 1, 2017, between Spire Alabama Inc. and certain institutional investors; filed as Exhibit 4.01 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2017.
4.21*	Second Supplement to Master Note Purchase Agreement, dated as of January 15, 2019, between Spire Alabama Inc. and certain institutional investors; filed as Exhibit 4.1 to Spire Alabama’s Current Report on Form 8-K on January 22, 2019.
4.22*	Deposit Agreement, dated as of May 21, 2019, among the Company, Computershare Inc. and Computershare Trust Company, N.A., acting jointly as depositary, and the holders from time to time of the depositary receipts described therein; filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K on May 21, 2019.
4.23*	Form of depositary receipt representing the Depositary Shares; filed as Exhibit A to Exhibit 4.1 to the Company’s Current Report on Form 8-K on May 21, 2019.
4.24*	Form of Certificate representing the Series A Preferred Stock; filed as Exhibit A to Exhibit 3.1 to the Company’s Current Report on Form 8-K on May 21, 2019.
4.25*	Thirty-Third Supplemental Indenture, dated as of September 15, 2017, between Spire Missouri Inc. and UMB Bank & Trust, N.A., as trustee, filed as Exhibit 4.28 to Spire Missouri's Annual Report on Form 10-K for the fiscal year ended September 30, 2019.
4.26*	Thirty-Fourth Supplemental Indenture, dated as of November 12, 2019, between Spire Missouri Inc. and UMB Bank & Trust, N.A., as trustee, filed as Exhibit 4.1 to Spire Missouri's Quarterly Report on Form 10-Q for the quarter ended December 31, 2019.

126

Exhibit Number	Description
4.27*	Third Supplement to Master Note Purchase Agreement, dated as of December 2, 2019, between Spire Alabama Inc. and certain institutional investors; filed as Exhibit 4.1 to Spire Alabama’s Current Report on Form 8-K on December 4, 2019.
4.28*	Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934; filed as Exhibit 4.29 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2019.
4.29*	Fourth Supplement to Master Note Purchase Agreement, dated as of December 15, 2020, between Spire Alabama Inc. and certain institutional investors; filed as Exhibit 4.1 to Spire Alabama’s Current Report on Form 8-K on December 18, 2020.
4.30*	Indenture (For Unsecured Debt Securities), dated as of February 16, 2021, between the Company and U.S. Bank National Association, as trustee; filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.31*	First Supplemental Indenture, dated as of February 16, 2021, between the Company and U.S. Bank National Association, as trustee; filed as Exhibit 4.2 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.32*	Form of Series A 0.75% Remarketable Senior Note due 2026; included in Exhibit 4.2 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.33*	Purchase Contract and Pledge Agreement, dated as of February 16, 2021, between the Company and U.S. Bank National Association, as purchase contract agent, collateral agent, custodial agent and securities intermediary; filed as Exhibit 4.4 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.34*	Form of Remarketing Agreement; included in Exhibit 4.4 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.35*	Form of Corporate Unit; included in Exhibit 4.4 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.36*	Form of Treasury Unit; included in Exhibit 4.4 to the Company’s Current Report on Form 8-K on February 16, 2021.
4.37*	Thirty-Fifth Supplemental Indenture, dated as of May 20, 2021, between Spire Missouri and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K on May 20, 2021.
4.38*	Form of 3.300% Series First Mortgage Bonds due 2051; included in Exhibit 4.1 to the Company’s Current Report on Form 8-K on May 20, 2021.
4.39*	Thirty-Sixth Supplemental Indenture, dated as of December 7, 2021, between Spire Missouri and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K on December 7, 2021.
4.40*	Form of First Mortgage Bonds, Floating Rate Series due 2024; included in Exhibit 4.1 to the Company’s Current Report on Form 8-K on December 7, 2021.
4.41*	Thirty-Seventh Supplemental Indenture, dated as of May 2, 2022, between Spire Missouri and UMB Bank & Trust, N.A., as trustee; filed as Exhibit 4.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022.
4.42*	Fifth Supplement to Master Note Purchase Agreement, dated as of October 13, 2022, between Spire Alabama Inc. and certain institutional investors, filed as Exhibit 4.1 to the Company’s and Spire Alabama's Current Report on Form 8-K on October 19, 2022.
4.43*	Thirty-Eighth Supplemental Indenture, dated as of February 13, 2023 between Spire Missouri and Regions Bank, as trustee (including Form of 4.800% Series First Mortgage Bond due 2033); filed as Exhibit 4.1 to the Company's and Spire Missouri's Current Report on Form 8-K on February 13, 2023.
4.44*	Second Supplement to Master Note Purchase Agreement, dated as of March 7, 2023, between Spire Inc. and certain institutional investors (including Form of 5.80% Series 2023 Senior Note, Tranche D, due March 15, 2033); filed as Exhibit 4.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2023.

127

Exhibit Number	Description
10.01*†3	Form of Indemnification Agreement between Laclede Gas and its Directors and Officers; filed as Exhibit 10.13 to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 1990.
10.02*†3	Salient Features of Laclede Gas’ Deferred Income Plan for Directors and Selected Executives, including amendments adopted by the Board of Directors on July 26, 1990; filed as Exhibit 10.12 to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 1991.
10.03*†3	Amendment to Laclede Gas’ Deferred Income Plan for Directors and Selected Executives, adopted by the Board of Directors on August 27, 1992; filed as Exhibit 10.12a to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 1992.
10.04*3	Amendment and Restatement of Retirement Plan for Non-Employee Directors of Laclede Gas as of November 1, 2002; filed as Exhibit 10.08c to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 2002.
10.05*3	Amendment to Terms of Retirement Plan for Non-Employee Directors of Laclede Gas as of October 1, 2004; filed as Exhibit 10.2 to Laclede Gas’ Quarterly Report on Form 10-Q for the quarter ended June 30, 2004.
10.06*	Form of Non-Qualified Stock Option Award Agreement with Mandatory Retirement Provisions; filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K on November 5, 2004.
10.07*	Form of Non-Qualified Stock Option Award Agreement without Mandatory Retirement Provisions; filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K on November 5, 2004.
10.08*3	Automated Meter Reading Services Agreement with Amendment dated as of July 1, 2017, between Landis+Gyr Technology, Inc., formerly known as Cellnet Technology, Inc., and Laclede Gas Company; filed as Exhibit 10.08 to the Company's Annual Report on Form 10-K for the fiscal year ended September 30, 2020.
10.09*3	Restated Laclede Gas Supplemental Retirement Benefit Plan, as amended and restated as of January 1, 2005; filed as Exhibit 10.06 to Laclede Gas’ Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.10*3	Laclede Gas Supplemental Retirement Benefit Plan II, effective as of January 1, 2005; filed as Exhibit 10.7 to Laclede Gas’ Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.11*3	Salient Features of Laclede Gas’ Deferred Income Plan II for Directors and Selected Executives (as amended and restated effective as of January 1, 2005); filed as Exhibit 10.1 to Laclede Gas’ Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.12*	Salient Features of the Company’s Deferred Income Plan for Directors and Selected Executives (effective as of January 1, 2005); filed as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.13*	The Company’s Form of Restricted Stock Award Agreement; filed as Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.14*3	The Laclede Group Management Continuity Protection Plan, effective as of January 1, 2005; filed as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.15*	Form of Management Continuity Protection Agreement; filed as Exhibit 10.5a to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2008.
10.16*3	The Laclede Group 2011 Management Continuity Protection Plan; filed as Exhibit 10.25 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2010.
10.17*	Form of Agreement under the Company’s 2011 Management Continuity Protection Plan; filed as Exhibit 10.25a to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2010.
10.18*	The Company’s Form of Performance Contingent Restricted Stock Unit Award Agreement; filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2012.
10.19*3	Laclede Gas Cash Balance Supplemental Retirement Benefit Plan, effective as of January 1, 2009; filed as Exhibit 10.19 to Laclede Gas’ Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

128

Exhibit Number	Description
10.20*	Lease Agreement, dated January 21, 2014, between the Company, as Tenant, and Market 700, LLC, as Landlord; filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K on January 27, 2014.
10.21*	The Company’s Deferred Income Plan for Directors and Selected Executives, as Amended and Restated as of January 1, 2015; filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K on November 4, 2014.
10.22*1	The Laclede Group 2015 Equity Incentive Plan; filed as the Appendix to the Company’s Definitive Proxy Statement on Form DEF 14A on December 19, 2014.
10.23*1	The Laclede Group, Inc. Annual Incentive Plan, as Amended; filed as Appendix to the Company’s Definitive Proxy Statement on Schedule 14A on December 18, 2015.
10.24*2 3	Loan Agreement, dated December 14, 2016, by and among Spire Inc., Alabama Gas Corporation, Laclede Gas Company, and the several banks party thereto, including Wells Fargo Bank, National Association, as Administrative Agent; JPMorgan Chase Bank, N.A. and U.S. Bank National Association, as Co-Syndication Agents; Wells Fargo Securities, LLC, JPMorgan Chase Bank, N.A., and U.S. Bank National Association, as Joint Lead Arrangers and Joint Bookrunners; and Bank of America, N.A., Credit Suisse AG, Cayman Islands Branch, Morgan Stanley Bank, N.A., Regions Bank, Royal Bank of Canada, and TD Bank, N.A., as Documentation Agents; filed as Exhibit 99.1 to the Company’s Current Report on Form 8-K on December 16, 2016.
10.25*	Commercial Paper Dealer Agreement, dated December 21, 2016, between Spire Inc. and Wells Fargo Securities, LLC; filed as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2016.
10.26*	Commercial Paper Dealer Agreement, dated December 21, 2016, between Spire Inc. and Credit Suisse Securities (USA) LLC; filed as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2016.
10.27*	Spire Inc. Executive Severance Plan; filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K on May 2, 2017.
10.28*1	Amendment 1 to The Laclede Group Annual Incentive Plan effective January 1, 2018; filed as Exhibit 10.53 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017.
10.29*1	Amendment 1 to The Laclede Group 2015 Equity Incentive Plan effective January 1, 2018; filed as Exhibit 10.54 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017.
10.30*	Amendment 1 to Spire Inc. Executive Severance Plan effective January 1, 2018; filed as Exhibit 10.55 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017.
10.31*1	Amendment 1 to The Laclede Group 2011 Management Continuity Protection Plan effective January 18, 2018; filed as Exhibit 10.56 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017.
10.32*	First Amendment to Loan Agreement, dated as of October 31, 2018, by and among Spire Inc., a Missouri corporation, Spire Alabama Inc. (formerly Alabama Gas Corporation), an Alabama corporation, and Spire Missouri Inc. (formerly Laclede Gas Company), a Missouri corporation, the Banks from time to time party thereto, and Wells Fargo Bank, National Association, as Administrative Agent for the Banks; filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K on November 6, 2018.
10.33*	Spire Deferred Income Plan, Amended and Restated Effective January 1, 2019; filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2019.
10.34*	The Company’s Form of Restricted Stock Award Agreement; filed as Exhibit 10.38 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2019.
10.35*	The Company’s Form of Restricted Stock Unit Award Agreement; filed as Exhibit 10.39 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2019.
10.36*	The Company’s Form of Performance Contingent Stock Unit Award Agreement; filed as Exhibit 10.40 to the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2019.

129

Exhibit Number	Description
10.37*	Amended and Restated Loan Agreement, dated July 22, 2022, among Spire Inc., Spire Missouri Inc., Spire Alabama Inc., Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto as Banks; filed as Exhibit 99.1 to the Company’s Current Report on Form 8-K on July 28, 2022.
10.38*	Equity Distribution Agreement of the Company, dated as of February 6, 2019; filed as Exhibit 1.1 to the Company's Current Report on Form 8-K on February 6, 2019.
10.39*	Letter Agreement to the Equity Distribution Agreement of the Company, dated as of May 14, 2019; filed as Exhibit 1.1 to the Company's Current Report on Form 8-K on May 14, 2019.
10.40*	Second Letter Agreement to the Equity Distribution Agreement of the Company, dated as of May 10, 2022, dated as of May 9, 2022; filed as Exhibit 1.1 to the Company's Current Report on Form 8-K on May 10, 2022.
21	Subsidiaries of the Company.
23.1	Consent of Independent Registered Public Accounting Firm of the Company.
23.2	Consent of Independent Registered Public Accounting Firm of Spire Missouri Inc.
23.3	Consent of Independent Registered Public Accounting Firm of Spire Alabama Inc.
31.1	Certifications under Rule 13a-14(a) of the CEO and CFO of the Company.
31.2	Certifications under Rule 13a-14(a) of the CEO and CFO of Spire Missouri Inc.
31.3	Certifications under Rule 13a-14(a) of the CEO and CFO of Spire Alabama Inc.
32.1	Section 1350 Certifications under Rule 13a-14(b) of the CEO and CFO of the Company.
32.2	Section 1350 Certifications under Rule 13a-14(b) of the CEO and CFO of Spire Missouri Inc.
32.3	Section 1350 Certifications under Rule 13a-14(b) of the CEO and CFO of Spire Alabama Inc.
97	Spire Inc. Clawback Policy
101	Interactive Data Files including the following information from the Annual Report on Form 10-K for the fiscal year ended September 30, 2023, formatted in inline extensible business reporting language (“Inline XBRL”): (i) Cover Page Interactive Data and (ii) the Financial Statements listed on the first page of Item 8.
104	Cover Page Interactive Data File (formatted in Inline XBRL and included in the Interactive Data Files submitted under Exhibit 101).

*	Incorporated herein by reference and made a part hereof. Spire Inc. File No. 1-16681. Spire Missouri Inc. File No. 1-1822. Spire Alabama Inc. File No. 2-38960.
†	Paper exhibit.
1	The Laclede Group, Inc. changed its name to Spire Inc. effective April 28, 2016.
2	Alabama Gas Corporation (“Alagasco”) changed its name to Spire Alabama Inc. effective September 1, 2017.
3	Laclede Gas Company changed its name to Spire Missouri Inc. effective August 30, 2017.

Bold items reflect management contracts or compensatory plans or arrangements.

Item 16. Form 10-K Summary

None.

130

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			Spire Inc.
Date	November 16, 2023	By	/s/ Steven P. Rasche
			Steven P. Rasche
			Executive Vice President and Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Date	Signature	Title
November 16, 2023	/s/ Steven L. Lindsey	Director, President and Chief Executive Officer
	Steven L. Lindsey	(Principal Executive Officer)
November 16, 2023	/s/ Steven P. Rasche	Executive Vice President and Chief Financial Officer
	Steven P. Rasche	(Principal Financial and Accounting Officer)
November 16, 2023	/s/ Edward L. Glotzbach	Chairman of the Board
	Edward L. Glotzbach
November 16, 2023	/s/ Mark A. Borer	Director
	Mark A. Borer
November 16, 2023	/s/ Vincent J. Ferrari	Director
	Vincent J. Ferrari
November 16, 2023	/s/ Maria V. Fogarty	Director
	Maria V. Fogarty
November 16, 2023	/s/ Carrie J. Hightman	Director
	Carrie J. Hightman
November 16, 2023	/s/ Rob L. Jones	Director
	Rob L. Jones
November 16, 2023	/s/ Paul D. Koonce	Director
	Paul D. Koonce
November 16, 2023	/s/ Brenda D. Newberry	Director
	Brenda D. Newberry
November 16, 2023	/s/ Stephen S. Schwartz	Director
	Stephen S. Schwartz
November 16, 2023	/s/ Suzanne Sitherwood	Director
	Suzanne Sitherwood
November 16, 2023	/s/ John P. Stupp Jr.	Director
	John P. Stupp Jr.

131

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			Spire Missouri Inc.
Date	November 16, 2023	By	/s/ Timothy W. Krick
			Timothy W. Krick
			Controller and Chief Accounting Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Date	Signature	Title
November 16, 2023	/s/ Steven L. Lindsey	Director and Chief Executive Officer
	Steven L. Lindsey	(Principal Executive Officer)
November 16, 2023	/s/ Adam W. Woodard	Chief Financial Officer and Treasurer
	Adam W. Woodard	(Principal Financial Officer)
November 16, 2023	/s/ Timothy W. Krick	Controller and Chief Accounting Officer
	Timothy W. Krick	(Principal Accounting Officer)
November 16, 2023	/s/ Suzanne Sitherwood	Chairman of the Board
	Suzanne Sitherwood
November 16, 2023	/s/ Matthew J. Aplington	Director
	Matthew J. Aplington
November 16, 2023	/s/ Stephen M. Mills	Director and President
	Stephen M. Mills
November 16, 2023	/s/ Steven P. Rasche	Director
	Steven P. Rasche

132

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			Spire Alabama Inc.
Date	November 16, 2023	By	/s/ Timothy W. Krick
			Timothy W. Krick
			Chief Accounting Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Date	Signature	Title
November 16, 2023	/s/ Steven L. Lindsey	Director and Chief Executive Officer
	Steven L. Lindsey	(Principal Executive Officer)
November 16, 2023	/s/ Adam W. Woodard	Chief Financial Officer and Treasurer
	Adam W. Woodard	(Principal Financial Officer)
November 16, 2023	/s/ Timothy W. Krick	Chief Accounting Officer
	Timothy W. Krick	(Principal Accounting Officer)
November 16, 2023	/s/ Suzanne Sitherwood	Chairman of the Board
	Suzanne Sitherwood
November 16, 2023	/s/ Matthew J. Aplington	Director
	Matthew J. Aplington
November 16, 2023	/s/ Joseph B. Hampton	Director and President
	Joseph B. Hampton
November 16, 2023	/s/ Steven P. Rasche	Director
	Steven P. Rasche

133

EX-21

Exhibit 21

SPIRE INC.

Subsidiaries of the Registrant

Direct and Indirect Subsidiaries:	Doing Business As:	Organized Under the Laws of:
Belle Butte LLC		Missouri
Laclede Development Company		Missouri
Laclede Insurance Risk Services, Inc.		South Carolina
Spire Alabama Inc.	Spire	Alabama
Spire CNG Inc.	Spire	Missouri
Spire EnergySouth Inc.	Spire	Delaware
Spire Gulf Inc.	Spire	Alabama
Spire Marketing Inc.		Missouri
Spire Midstream LLC		Missouri
Spire Mississippi Inc.	Spire	Mississippi
Spire Missouri Inc.	Spire, Spire Missouri East or Spire Missouri West	Missouri
Spire NGL Inc.	Spire	Missouri
Spire Oil Services LLC	Spire	Missouri
Spire Resources LLC		Missouri
Spire Services Inc.	Spire	Missouri
Spire STL Pipeline LLC		Missouri
Spire Storage Salt Plains LLC	Spire or Spire Storage	Delaware
Spire Storage West LLC	Spire or Spire Storage	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-272457 and 333-264799 on Forms S-3ASR and in Registration Statement Nos. 333-261304, 333-231354, 333‑215042 and 333‑201863 on Forms S‑8 of our reports dated November 16, 2023, relating to the consolidated financial statements of Spire Inc. and subsidiaries, and the effectiveness of Spire Inc. and subsidiaries’ internal control over financial reporting, appearing in this Annual Report on Form 10-K of Spire Inc. and subsidiaries for the year ended September 30, 2023.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333‑264799-01 on Form S‑3ASR of our report dated November 16, 2023, relating to the financial statements of Spire Missouri Inc., appearing in this Annual Report on Form 10‑K of Spire Missouri Inc. for the year ended September 30, 2023.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

EX-23.3

Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-121077 on Form S-3 of our report dated November 16, 2023, relating to the financial statements of Spire Alabama Inc., appearing in this Annual Report on Form 10-K of Spire Alabama Inc. for the year ended September 30, 2023.

/s/ Deloitte & Touche LLP

St. Louis, Missouri

November 16, 2023

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Steven L. Lindsey, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			President and Chief Executive Officer

CERTIFICATION

I, Steven P. Rasche, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Steven P. Rasche
			Steven P. Rasche
			Executive Vice President and Chief Financial Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Steven L. Lindsey, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Missouri Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			Chief Executive Officer

CERTIFICATION

I, Adam W. Woodard, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Missouri Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Adam W. Woodard
			Adam W. Woodard
			Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION

I, Steven L. Lindsey, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Alabama Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			Chief Executive Officer

CERTIFICATION

I, Adam W. Woodard, certify that:

1. I have reviewed this annual report on Form 10-K of Spire Alabama Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 16, 2023	Signature:	/s/ Adam W. Woodard
			Adam W. Woodard
			Chief Financial Officer

EX-32.1

Exhibit 32.1

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven L. Lindsey, President and Chief Executive Officer of Spire Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Inc.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			President and Chief Executive Officer

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven P. Rasche, Executive Vice President and Chief Financial Officer of Spire Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Inc.

Date:	November 16, 2023	Signature:	/s/ Steven P. Rasche
			Steven P. Rasche
			Executive Vice President and Chief Financial Officer

EX-32.2

Exhibit 32.2

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven L. Lindsey, Chief Executive Officer of Spire Missouri Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Missouri Inc.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			Chief Executive Officer

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Adam W. Woodard, Chief Financial Officer of Spire Missouri Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Missouri Inc.

Date:	November 16, 2023	Signature:	/s/ Adam W. Woodard
			Adam W. Woodard
			Chief Financial Officer

EX-32.3

Exhibit 32.3

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven L. Lindsey, Chief Executive Officer of Spire Alabama Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Alabama Inc.

Date:	November 16, 2023	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			Chief Executive Officer

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Adam W. Woodard, Chief Financial Officer of Spire Alabama Inc., hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-K for the period ended September 30, 2023, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-K for the period ended September 30, 2023, fairly presents, in all material respects, the financial condition and results of operations of Spire Alabama Inc.

Date:	November 16, 2023	Signature:	/s/ Adam W. Woodard
			Adam W. Woodard
			Chief Financial Officer

EX-97

Exhibit 97

Spire Inc.

Clawback Policy

Effective as of December 1, 2023

Section 1. Purpose

This Clawback Policy (this “Policy”) has been adopted by the Board of Directors (the “Board”) of Spire Inc. (the “Company”) effective as of December 1, 2023.

This Policy is designed to comply with Section 10D of the Securities Exchange Act of 1934 (the “Exchange Act”) and with New York Stock Exchange (“NYSE”) Rule 303A.14, and provides for the recoupment of certain Incentive Compensation (as defined below).

Section 2. Administration

This Policy shall be administered by the Board or, if so designated by the Board, the Compensation and Human Resources Committee of the Board (the “Committee”), in which case references herein to the Board shall be deemed references to the Committee.

Subject to the provisions of this Policy, the Board shall make such determinations and interpretations and take such actions in connection with this Policy as it deems necessary or advisable. All determinations and interpretations made by the Board shall be final, binding and conclusive.

Section 3. Definitions

i. “Accounting Restatement” means a restatement of the Company’s financial statements due to material noncompliance of the Company with any financial reporting requirement under applicable securities laws, including: (A) a restatement to correct a material error in a previously issued financial statement; or (B) a restatement to correct an immaterial error from a previously issued financial statement would result in a material misstatement in the current-period financial statement.

ii. “Covered Employee” means any current and former Executive Officers, and such other senior executives who may from time to time be deemed subject to the Policy by the Board or Committee.

iii. “Excess Incentive Compensation” means the amount of Incentive Compensation received by the Covered Employee that exceeds the amount of Incentive Compensation that would have otherwise been received by the Covered Employee had it been determined based on the results of the Accounting Restatement, computed without regard to any taxes paid.

iv. “Executive Officer” shall have the meaning set forth in NYSE Rule 303A.14.

v. “Financial Reporting Measures” are measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, whether presented in or outside of the Company’s financial statements, any measure derived wholly or in part from such measures (including non-GAAP measures and other measures, metrics, and ratios that are non-GAAP measures). Stock price and total shareholder return are also financial reporting measures.

vi. “Incentive Compensation” means any compensation including, but not limited to: (i) annual bonuses and other short-term and long-term cash incentives; (ii) stock options; (iii) stock appreciation rights; (iv) restricted stock; (v) restricted stock units; (vi) performance shares; and (vii) performance units, in each case, that is granted, earned, or vested based wholly or in part on the attainment of any of the Financial Reporting Measures.

vii. “Recovery Period” means the three (3) completed fiscal years immediately preceding the Required Accounting Restatement Date. In addition, the Recovery Period shall include any transition period (that results from a change in the Company’s fiscal year) within or immediately following the aforementioned three (3) completed fiscal years; provided, however, that a transition period between the last day of the Company’s previous fiscal year end and the first of its new fiscal year that comprises a period of nine (9) to twelve (12) months would be deemed a completed fiscal year.

viii. “Required Accounting Restatement Date” means the earlier to occur of: (i) the date the Board, a committee of the Board, or the officers or officers of the Company authorized to take such action if the Board is not required, concludes, or reasonably should have concluded, that the Company is required to prepare an Accounting Restatement or (ii) the date a court, regulatory, or other legally authorized body directs to the Company to prepare an Accounting Restatement.

Section 4. Persons Subject to this Policy

This Policy shall apply to all Incentive Compensation received on or after October 2, 2023, by a Covered Employee: (i) after beginning service as an Executive Officer; (ii) who served as an Executive Officer during the Recovery Period; and (iii) while the Company has a class of securities listed on a national securities exchange or a national securities association. Notwithstanding the foregoing, the Board may choose to apply this Policy, in its discretion, to Incentive Compensation received by a Covered Person during the Recovery Period even if such person did not serve as an Executive Officer during all or part of the Recovery Period.

Section 5. Erroneously Awarded Incentive Compensation and Amount Subject to Clawback.

In the event the Company is required to prepare an Accounting Restatement, the amount to be recovered from the Covered Employee shall be the Excess Incentive Compensation paid or awarded to a Covered Employee during the Recovery Period. For purposes of calculating the Excess Incentive Compensation amount, Incentive Compensation will be deemed received in the Company’s fiscal period during which the Financial Reporting Measure specified in the incentive-based compensation award is attained, even if the payment or grant of the Incentive Compensation occurs after the end of that period.

Notwithstanding the foregoing, if the Board cannot determine the amount of Excess Incentive Compensation received by the Covered Employee directly from the information in the Accounting Restatement, the Board will make a determination as to the amount of Excess Incentive Compensation based on a reasonable estimate of the effect of the Accounting Restatement.

Any action by the Company to recover Excess Incentive Compensation under this Policy from a Covered Employee shall not, whether alone or in combination with any other action, event or condition, be deemed (i) “good reason” for resignation or to serve as a basis for a claim of constructive termination under any benefits or compensation arrangement applicable to such Covered Employee, or (ii) to constitute a breach of a contract or other arrangement to which such Covered Employee is party.

Section 6. Method of Recoupment

The Board shall determine, in its sole discretion, the method of recovering or cancelling, as the case may be, Excess Incentive Compensation, which may include, without limitation, any one or more of the following:

i. requiring reimbursement of cash Excess Incentive Compensation previously paid;

ii. seeking the recovery of any gain realized on the vesting, exercise, settlement, sale, transfer, or other disposition of any equity or equity-based awards;

iii. offsetting the Excess Incentive Compensation from any compensation otherwise owed by the Company to the Covered Employee;

iv. cancelling outstanding vested or unvested equity awards; and/or

v. taking any other remedial recovery action permitted by law, as determined by the Board.

Section 7. Impracticability

The Board shall recover any Excess Incentive Compensation in accordance with this Policy unless the Board concludes such recovery would be impracticable, as determined by the Board pursuant to and in accordance with Rule 10D-1 of the Exchange Act and NYSE Rule 303A.14.

Section 8. Indemnification

The Company shall not indemnify any Covered Employee, directly or indirectly, for any losses that such Covered Employee may incur in connection with the recovery of any compensation set forth in this Policy.

Section 9. Other Recoupment Rights

Any applicable employment agreement, award agreement or other document setting forth the terms and conditions of any compensation covered by this Policy shall be deemed to include the restrictions imposed herein and incorporate this Policy by reference and, in the event of any inconsistency, the terms of this Policy will govern. To the extent that any applicable law or stock market or exchange rules or regulations permit or require recovery of compensation in circumstances in addition to those specified herein, nothing in this Policy will be deemed to limit or restrict the right or obligation of the Company to recover such compensation to the fullest extent permitted or required by such law, rules or regulations. Notwithstanding the foregoing, there shall be no duplication of recovery of the same Excess Incentive Compensation under this Policy and any such other clawback rights, unless required by applicable law.

The Board shall provide notice and seek written acknowledgement of this Policy from each Covered Employee as soon as practicable after the later of (i) the Effective Date and (ii) the date on which the employee is designated as a Covered Officer; provided, however, that failure to obtain such acknowledgement shall have no impact on the enforceability of this Policy.

Section 10. Interpretation; Amendment; Termination

The Board may amend this Policy from time to time in its discretion and shall amend this Policy as it deems necessary to comply with the regulations adopted by the Securities and Exchange Commission under Section 10D of the Exchange Act and with NYSE Rule 303A.14, or any successor regulations or rules. The Board may terminate this Policy at any time.

Section 11. Enforceability

If any provision of this Clawback Policy is determined to be unenforceable or invalid under any applicable law, such provision will be applied to the maximum extent permitted by applicable law, and shall automatically be deemed amended in a manner consistent with its objectives to the extent necessary to conform to any limitations required under applicable law.

Section 12. Successors

This Policy shall be binding and enforceable against all Covered Employees and their beneficiaries, heirs, executors, administrators or other legal representatives.

Section 13. Disclosure

The Company will file the Policy as well as make any necessary disclosures, including disclosure of any recovered compensation, as required by the Exchange Act and NYSE listing standards.

XML

Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2023	Nov. 10, 2023	Mar. 31, 2023
Document Information [Line Items]
Entity Central Index Key	0001126956
Entity Registrant Name	Spire Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-16681
Entity Address, Address Line One	700 Market Street
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101
City Area Code	314
Local Phone Number	342-0500
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	74-2976504
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 3,580,140,878
Entity Common Stock, Shares Outstanding		53,176,840
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	St. Louis, Missouri
Spire Missouri [Member]
Document Information [Line Items]
Entity Central Index Key	0000057183
Entity Registrant Name	Spire Missouri Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity File Number	1-1822
Entity Address, Address Line One	700 Market Street
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101
City Area Code	314
Local Phone Number	342-0500
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-0368139
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,855
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	St. Louis, Missouri
Spire Alabama Inc [Member]
Document Information [Line Items]
Entity Central Index Key	0000003146
Entity Registrant Name	Spire Alabama Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity File Number	2-38960
Entity Address, Address Line One	605 Richard Arrington Blvd N
Entity Address, City or Town	Birmingham
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35203
City Area Code	205
Local Phone Number	326-8100
Entity Incorporation, State or Country Code	AL
Entity Tax Identification Number	63-0022000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,972,052
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	St. Louis, Missouri
Depositary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of 5.90% Series A Cumulative Redeemable Perpetual
Trading Symbol	SR.PRA
Security Exchange Name	NYSE
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock $1.00 par value
Trading Symbol	SR
Security Exchange Name	NYSE

XML

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2021
Operating Revenues	$ 2,666.3		$ 2,198.5		$ 2,235.5
Operating Expenses:
Natural gas	1,260.8		923.9		946.3
Operation and maintenance	517.6		449.6		465.8
Depreciation and amortization	254.8		237.3		213.1
Taxes, other than income taxes	214.5		179.5		160.1
Total Operating Expenses	2,247.7		1,790.3		1,785.3
Operating Income	418.6		408.2		450.2
Interest Expense	185.7		119.8		106.6
Other Income (Expense), Net	23.4		(8.7)		(3.4)
Income Before Income Taxes	256.3		279.7		340.2
Income Tax Expense	38.8		58.9		68.5
Net Income	217.5		220.8		271.7
Provision for preferred dividends	14.8		14.8		14.8
Income allocated to participating securities	0.3		0.3		0.4
Net Income Available to Common Shareholders	202.4		205.7		256.5
Other Comprehensive Income (Loss), Net of Tax	0.4		43.6		44.8
Comprehensive Income	217.9		264.4		316.5
Operating Revenues	$ 2,666.3		$ 2,198.5		$ 2,235.5
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	52.5		52.0		51.6
Diluted (in shares)	52.6		52.1		51.7
Basic Earnings Per Share of Common Stock (in dollars per share)	$ 3.86		$ 3.96		$ 4.97
Diluted Earnings Per Share of Common Stock (in dollars per share)	$ 3.85		$ 3.95		$ 4.96
Operating Revenues	$ 2,666.3		$ 2,198.5		$ 2,235.5
Spire Missouri [Member]
Operating Revenues	1,762.9		1,321.0		1,516.6
Operating Expenses:
Natural gas	943.4		587.0		786.8
Operation and maintenance	296.2		255.7		261.1
Depreciation and amortization	158.7		145.3		129.2
Taxes, other than income taxes	157.5		129.0		110.9
Total Operating Expenses	1,555.8		1,117.0		1,288.0
Operating Income	207.1		204.0		228.6
Interest Expense	97.4		60.9		50.3
Other Income (Expense), Net	19.4		(6.9)		(8.9)
Income Before Income Taxes	129.1		136.2		169.4
Income Tax Expense	11.6		21.3		25.3
Net Income	117.5		114.9		144.1	[1]
Other Comprehensive Income (Loss), Net of Tax	0.2	[1]	1.5	[1]	(1.3)
Comprehensive Income	117.7		116.4		142.8
Operating Revenues	1,762.9		1,321.0		1,516.6
Weighted Average Number of Common Shares Outstanding:
Operating Revenues	1,762.9		1,321.0		1,516.6
Spire Alabama Inc [Member]
Operating Revenues	571.1		509.1		494.0
Operating Expenses:
Natural gas	202.7		161.5		145.3
Operation and maintenance	136.4		130.1		132.5
Depreciation and amortization	69.3		66.8		62.1
Taxes, other than income taxes	43.0		38.1		37.1
Total Operating Expenses	451.4		396.5		377.0
Operating Income	119.7		112.6		117.0
Interest Expense	34.9		21.3		20.2
Other Income (Expense), Net	1.5		0.4		2.0
Income Before Income Taxes	86.3		91.7		98.8
Income Tax Expense	20.3		23.2		25.0
Net Income	66.0		68.5		73.8
Operating Revenues	571.1		509.1		494.0
Weighted Average Number of Common Shares Outstanding:
Operating Revenues	$ 571.1		$ 509.1		$ 494.0

[1] Accumulated other comprehensive income (loss)

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 217.5	$ 220.8	$ 271.7
Other Comprehensive Income, Before Tax:
Net hedging gain arising during the period	20.1	56.7	61.2
Amounts reclassified into regulatory liabilities	(17.5)	0.0	0.0
Amounts reclassified into net income	(2.4)	(1.2)	(1.3)
Net gain on cash flow hedging derivative instruments	0.2	55.5	59.9
Net gain (loss) on defined benefit pension and other postretirement plans	0.2	1.5	(1.3)
Net unrealized gain (loss) on available-for-sale debt securities	0.1	(0.4)	(0.2)
Other Comprehensive Income, Before Tax	0.5	56.6	58.4
Income Tax Expense Related to Items of Other Comprehensive Income	0.1	13.0	13.6
Other Comprehensive Income, Net of Tax	0.4	43.6	44.8
Comprehensive Income	$ 217.9	$ 264.4	$ 316.5

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Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022
ASSETS
Utility Plant		$ 8,210.1	$ 7,664.9
Less: Accumulated depreciation and amortization		2,431.2	2,294.5
Net Utility Plant		5,778.9	5,370.4
Non-utility Property (net of accumulated depreciation and amortization of $71.1 and $50.7 at September 30, 2023 and 2022, respectively)		628.5	491.4
Other Investments		102.6	87.8
Total Other Property and Investments		731.1	579.2
Other Property and Investments		731.1	579.2
Current Assets:
Cash and cash equivalents		5.6	6.5
Utility		192.4	210.8
Other		128.6	443.8
Allowance for credit losses		(32.5)	(31.9)
Delayed customer billings		22.0	21.3
Accounts receivable:
Utility		192.4	210.8
Other		128.6	443.8
Allowance for credit losses		(32.5)	(31.9)
Delayed customer billings		22.0	21.3
Inventories:
Natural gas		223.7	371.8
Propane gas		8.6	8.6
Materials and supplies		47.2	41.9
Regulatory assets		348.3	355.4
Prepayments		48.2	41.1
Other current assets		84.8	122.7
Total Current Assets		1,076.9	1,592.0
Deferred Charges and Other Assets:
Goodwill		1,171.6	1,171.6
Regulatory assets		1,249.2	1,112.4
Other		305.9	258.1
Total Deferred Charges and Other Assets		2,726.7	2,542.1
Total Assets		10,313.6	10,083.7
Capitalization:
Common stock value		53.2	52.5
Paid-in capital		1,616.5	1,571.3
Retained earnings		958.0	905.5
Accumulated other comprehensive income		47.6	47.2
Total Shareholders' Equity		2,917.3	2,818.5
Temporary equity		16.5	13.1
Long-term debt (less current portion)		3,554.0	2,958.5
Total Capitalization		6,487.8	5,790.1
Current Liabilities:
Current portion of long-term debt		156.6	281.2
Notes payable		955.5	1,037.5
Accounts payable		253.1	617.4
Advance customer billings		20.9	18.7
Wages and compensation accrued		47.0	50.2
Customer deposits		27.7	28.2
Taxes accrued		104.1	90.1
Regulatory liabilities		7.3	3.7
Other current liabilities		183.2	226.6
Total Current Liabilities		1,755.4	2,353.6
Deferred Credits and Other Liabilities:
Deferred income taxes		743.7	675.1
Pension and postretirement benefit costs		137.3	163.0
Asset retirement obligations		577.4	520.9
Regulatory liabilities		472.4	418.2
Other noncurrent liabilities		139.6	162.8
Total Deferred Credits and Other Liabilities		2,070.4	1,940.0
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities		10,313.6	10,083.7
Depositary Shares [Member]
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at September 30, 2023 and 2022)		242.0	242.0
Spire Missouri [Member]
ASSETS
Utility Plant		4,964.9	4,550.4
Less: Accumulated depreciation and amortization		1,043.2	982.1
Net Utility Plant		3,921.7	3,568.3
Total Other Property and Investments		65.7	58.9
Other Property and Investments		65.7	58.9
Current Assets:
Cash and cash equivalents		0.8	0.0
Utility		142.6	131.5
Other		21.1	44.5
Allowance for credit losses		(26.2)	(24.9)
Delayed customer billings		17.9	16.1
Accounts receivable:
Utility		142.6	131.5
Other		21.1	44.5
Allowance for credit losses		(26.2)	(24.9)
Delayed customer billings		17.9	16.1
Inventories:
Natural gas		132.8	215.3
Propane gas		8.6	8.6
Materials and supplies		24.2	22.0
Regulatory assets		293.1	288.1
Prepayments		26.7	23.3
Total Current Assets		642.9	728.2
Deferred Charges and Other Assets:
Goodwill		210.2	210.2
Regulatory assets		617.6	547.6
Other		147.4	105.0
Total Deferred Charges and Other Assets		975.2	862.8
Total Assets		5,605.5	5,218.2
Capitalization:
Common stock value		0.1	0.1
Paid-in capital		854.8	816.1
Retained earnings		992.4	931.9
Accumulated other comprehensive income		(2.5)	(2.7)
Total Shareholders' Equity	[1]	1,844.8	1,745.4
Long-term debt (less current portion)		1,785.4	1,387.7
Total Capitalization		3,630.2	3,133.1
Current Liabilities:
Current portion of long-term debt		0.0	250.0
Advance customer billings		11.0	7.0
Wages and compensation accrued		23.6	33.8
Customer deposits		5.8	6.5
Taxes accrued		60.3	50.4
Regulatory liabilities		0.0	0.0
Other current liabilities		48.7	45.6
Total Current Liabilities		786.3	970.9
Deferred Credits and Other Liabilities:
Deferred income taxes		531.8	500.1
Pension and postretirement benefit costs		103.3	115.5
Asset retirement obligations		111.1	110.6
Regulatory liabilities		389.4	331.8
Other noncurrent liabilities		53.4	56.2
Total Deferred Credits and Other Liabilities		1,189.0	1,114.2
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities		5,605.5	5,218.2
Spire Missouri [Member] | Related Party [Member]
Current Assets:
Utility		1.3	3.7
Accounts receivable:
Utility		1.3	3.7
Current Liabilities:
Notes payable		540.6	445.3
Accounts payable		10.5	13.3
Spire Missouri [Member] | Nonrelated Party [Member]
Current Liabilities:
Accounts payable		85.8	119.0
Spire Alabama Inc [Member]
ASSETS
Utility Plant		2,862.6	2,732.6
Less: Accumulated depreciation and amortization		1,273.0	1,184.1
Net Utility Plant		1,589.6	1,548.5
Current Assets:
Cash and cash equivalents		1.2	2.4
Utility		42.2	69.9
Other		6.6	6.5
Allowance for credit losses		(5.7)	(6.3)
Delayed customer billings		3.6	4.8
Accounts receivable:
Utility		42.2	69.9
Other		6.6	6.5
Allowance for credit losses		(5.7)	(6.3)
Delayed customer billings		3.6	4.8
Inventories:
Natural gas		52.4	72.5
Materials and supplies		19.1	16.3
Regulatory assets		41.6	56.9
Prepayments		6.4	5.8
Total Current Assets		168.6	230.1
Deferred Charges and Other Assets:
Regulatory assets		606.9	538.2
Other		84.2	81.3
Total Deferred Charges and Other Assets		691.1	630.5
Total Assets		2,449.3	2,409.1
Deferred income tax		0.0	11.0
Capitalization:
Retained earnings		642.1	589.1
Total Shareholders' Equity		928.0	906.0
Long-term debt (less current portion)		745.9	571.5
Total Capitalization		1,673.9	1,477.5
Common stock and paid-in capital (par value $0.01 per share; 3,000,000 shares authorized; 1,972,052 issued and outstanding at September 30, 2023 and 2022)		285.9	316.9
Current Liabilities:
Accounts payable		28.4	85.6
Advance customer billings		8.1	9.9
Wages and compensation accrued		6.6	7.6
Customer deposits		19.3	19.0
Taxes accrued		34.5	31.3
Regulatory liabilities		0.0	0.0
Other current liabilities		14.7	22.4
Total Current Liabilities		240.3	441.1
Deferred Credits and Other Liabilities:
Deferred income taxes		9.1	0.0
Pension and postretirement benefit costs		27.2	40.5
Asset retirement obligations		451.0	398.7
Regulatory liabilities		21.2	23.0
Other noncurrent liabilities		26.6	28.3
Total Deferred Credits and Other Liabilities		535.1	490.5
Commitments and Contingencies (Note 16)
Total Capitalization and Liabilities		2,449.3	2,409.1
Spire Alabama Inc [Member] | Related Party [Member]
Current Assets:
Utility		1.2	1.3
Accounts receivable:
Utility		1.2	1.3
Current Liabilities:
Notes payable		124.1	260.9
Accounts payable		$ 4.6	$ 4.4

[1] Accumulated other comprehensive income (loss)

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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Non-utility property, accumulated depreciation and amortization	$ 71.1	$ 50.7
Preferred stock, shares authorized (in shares)	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	53,200,000	52,500,000
Common Stock, shares outstanding (in shares)	53,200,000	52,500,000
Spire Missouri [Member]
Preferred stock, shares authorized (in shares)		1,480,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	25,855	25,325
Common Stock, shares outstanding (in shares)	25,855	25,325
Spire Alabama Inc [Member]
Preferred stock, shares authorized (in shares)	120,000	120,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	1,972,052	1,972,052
Common Stock, shares outstanding (in shares)	1,972,052	1,972,052
Depositary Shares [Member]
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	10,000,000	10,000,000

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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Spire Missouri [Member] Common Stock [Member]	Spire Missouri [Member] Additional Paid-in Capital [Member]	Spire Missouri [Member] Retained Earnings [Member]	Spire Missouri [Member] AOCI Attributable to Parent [Member]	Spire Missouri [Member]		Spire Alabama Inc [Member] Common Stock [Member]	Spire Alabama Inc [Member] Additional Paid-in Capital [Member]	Spire Alabama Inc [Member] Retained Earnings [Member]	Spire Alabama Inc [Member]	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]		Total
Balance (in shares) at Sep. 30, 2020	24,577						1,972,052				51,611,789
Balance at Sep. 30, 2020	$ 0.1	$ 765.0	$ 672.9	$ (2.9)	$ 1,435.1	[1]	$ 0.0	$ 350.9	$ 500.8	$ 851.7	$ 51.6	$ 242.0	$ 1,549.2	$ 720.7	$ (41.2)	[1]	$ 2,522.3
Net Income	0.0	0.0	144.1	0.0	144.1	[1]	0.0	0.0	73.8	73.8	$ 0.0		0.0	271.7	0.0	[1]	271.7
Dividend reinvestment plan (in shares)											24,565
Dividend reinvestment plan											$ 0.0	0.0	1.6	0.0	0.0	[1]	1.6
Stock-based compensation costs											$ 0.0		9.1	0.0	0.0	[1]	9.1
Stock issued under stock-based compensation plans (in shares)											65,316
Stock issued under stock-based compensation plans											$ 0.1	0.0	(0.1)	0.0	0.0		0.0
Employees’ tax withholding for stock-based compensation (in shares)											(16,787)
Employees’ tax withholding for stock-based compensation											$ 0.0	0.0	(1.1)	0.0	0.0	[1]	(1.1)
Equity units issued											0.0	0.0	(40.8)	0.0	0.0		(40.8)
Temporary equity adjustment to redemption value											0.0		0.0	1.3	0.0	[1]	1.3
Common stock, dividends							0.0	0.0	(22.0)	(22.0)	0.0		0.0	(135.9)	0.0	[1]	(135.9)
Preferred stock dividends											0.0		0.0	(14.8)	0.0	[1]	(14.8)
Other Comprehensive Income (Loss), Net of Tax	$ 0.0	0.0	0.0	(1.3)	(1.3)						$ 0.0	0.0	0.0	0.0	44.8		44.8
Return of capital to Spire							$ 0.0	(22.0)	0.0	(22.0)
Balance (in shares) at Sep. 30, 2021	24,577						1,972,052				51,684,883
Balance at Sep. 30, 2021	$ 0.1	765.0	817.0	(4.2)	1,577.9	[1]	$ 0.0	328.9	552.6	881.5	$ 51.7	242.0	1,517.9	843.0	3.6	[1]	2,658.2
Net Income	0.0	0.0	114.9	0.0	114.9		0.0	0.0	68.5	68.5	$ 0.0	0.0	0.0	220.8	0.0		220.8
Dividend reinvestment plan (in shares)											24,154
Dividend reinvestment plan											$ 0.0	0.0	1.6	0.0	0.0		1.6
Stock-based compensation costs											$ 0.0	0.0	4.1	0.0	0.0		4.1
Stock issued under stock-based compensation plans (in shares)											93,936
Stock issued under stock-based compensation plans											$ 0.1	0.0	(0.1)	0.0	0.0		0.0
Employees’ tax withholding for stock-based compensation (in shares)											(28,055)
Employees’ tax withholding for stock-based compensation											$ 0.0	0.0	(1.8)	0.0	0.0		(1.8)
Common stock, dividends							0.0	0.0	(32.0)	(32.0)	0.0	0.0	0.0	(143.5)	0.0		(143.5)
Preferred stock dividends											0.0	0.0	0.0	(14.8)	0.0		(14.8)
Other Comprehensive Income (Loss), Net of Tax	$ 0.0	0.0	0.0	1.5	1.5	[1]					$ 0.0	0.0	0.0	0.0	43.6		43.6
Common stock issued (in shares)	748										719,625
Common stock issued	$ 0.0	51.1	0.0	0.0	51.1						$ 0.7	0.0	49.6	0.0	0.0		50.3
Return of capital to Spire							$ 0.0	(12.0)	0.0	(12.0)
Balance (in shares) at Sep. 30, 2022	25,325						1,972,052				52,494,543
Balance at Sep. 30, 2022	$ 0.1	816.1	931.9	(2.7)	1,745.4	[1]	$ 0.0	316.9	589.1	906.0	$ 52.5	242.0	1,571.3	905.5	47.2		2,818.5
Net Income	0.0	0.0	117.5	0.0	117.5		0.0	0.0	66.0	66.0	$ 0.0	0.0	0.0	217.5	0.0		217.5
Dividend reinvestment plan (in shares)											22,230
Dividend reinvestment plan											$ 0.0	0.0	1.5	0.0	0.0		1.5
Stock-based compensation costs											$ 0.0	0.0	5.3	0.0	0.0		5.3
Stock issued under stock-based compensation plans (in shares)											60,007
Stock issued under stock-based compensation plans											$ 0.1	0.0	(0.1)	0.0	0.0		0.0
Employees’ tax withholding for stock-based compensation (in shares)											(18,428)
Employees’ tax withholding for stock-based compensation											$ 0.0	0.0	(1.4)	0.0	0.0		(1.4)
Temporary equity adjustment to redemption value											0.0	0.0	0.0	2.3	0.0		2.3
Common stock, dividends	0.0	0.0	(57.0)	0.0	(57.0)		0.0	0.0	(13.0)	(13.0)	0.0	0.0	0.0	(152.5)	0.0		(152.5)
Preferred stock dividends											0.0	0.0	0.0	(14.8)	0.0		(14.8)
Other Comprehensive Income (Loss), Net of Tax	$ 0.0	0.0	0.0	0.2	0.2	[1]					$ 0.0	0.0	0.0	0.0	0.4		0.4
Common stock issued (in shares)	530										611,872
Common stock issued	$ 0.0	38.7	0.0	0.0	38.7						$ 0.6	0.0	39.9	0.0	0.0		40.5
Return of capital to Spire							$ 0.0	(31.0)	0.0	(31.0)
Balance (in shares) at Sep. 30, 2023	25,855						1,972,052				53,170,224
Balance at Sep. 30, 2023	$ 0.1	$ 854.8	$ 992.4	$ (2.5)	$ 1,844.8	[1]	$ 0.0	$ 285.9	$ 642.1	$ 928.0	$ 53.2	$ 242.0	$ 1,616.5	$ 958.0	$ 47.6		$ 2,917.3

[1] Accumulated other comprehensive income (loss)

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Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Common stock, dividends per share declared (in dollars per share)	$ 2.88	$ 2.74	$ 2.6
Preferred stock dividends per share declared (in dollars per share)	$ 1.475	$ 1.475	$ 1.475

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 217.5	$ 220.8	$ 271.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	254.8	237.3	213.1
Deferred income taxes and investment tax credits	36.9	57.9	67.0
Changes in assets and liabilities:
Accounts receivable	334.2	(26.5)	(343.0)
Inventories	142.8	(117.2)	(111.0)
Regulatory assets and liabilities	(68.7)	(409.0)	76.6
Accounts payable	(389.2)	190.7	177.7
Delayed/advance customer billings, net	1.5	(25.5)	(12.4)
Taxes accrued	15.0	11.2	8.9
Other assets and liabilities	(117.6)	(93.5)	(116.1)
Other	13.0	8.8	17.3
Net cash provided by operating activities	440.2	55.0	249.8
Delayed/advance customer billings	1.5	(25.5)	(12.4)
Investing Activities:
Capital expenditures	(662.5)	(552.2)	(624.8)
Business acquisition	(37.0)	0.0	0.0
Other	4.0	5.5	2.8
Net cash used in investing activities	(695.5)	(546.7)	(622.0)
Financing Activities:
Issuance of long-term debt	755.0	300.0	629.1
Repayment of long-term debt	(281.2)	(55.8)	(115.4)
(Repayment) Issuance of short-term debt, net	(82.0)	365.5	24.0
Issuance of common stock	41.9	51.9	1.0
Dividends paid on common stock	(150.7)	(141.9)	(133.2)
Dividends paid on preferred stock	(14.8)	(14.8)	(14.8)
Other financing activities	(7.6)	(4.0)	(11.3)
Net cash provided by financing activities	260.6	500.9	379.4
Net Increase in Cash, Cash Equivalents, and Restricted Cash	5.3	9.2	7.2
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	20.5	11.3	4.1
Cash, Cash Equivalents, and Restricted Cash at End of Year	25.8	20.5	11.3
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(177.5)	(119.9)	(98.7)
Income taxes	(2.0)	(1.8)	(1.5)
Spire Missouri [Member]
Operating Activities:
Net Income	117.5	114.9	144.1	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	158.7	145.3	129.2
Deferred income taxes and investment tax credits	11.6	21.3	25.3
Changes in assets and liabilities:
Accounts receivable	16.0	163.8	(207.4)
Inventories	80.2	(45.4)	(79.0)
Regulatory assets and liabilities	(22.4)	(314.3)	35.9
Accounts payable	(45.7)	25.3	23.1
Delayed/advance customer billings, net	2.2	(26.4)	(13.0)
Taxes accrued	9.7	9.3	2.1
Other assets and liabilities	(108.4)	(48.0)	(115.0)
Other	1.7	1.4	0.7
Net cash provided by operating activities	221.1	47.2	(54.0)
Delayed/advance customer billings	2.2	(26.4)	(13.0)
Investing Activities:
Capital expenditures	(447.5)	(354.1)	(382.6)
Other	4.1	3.6	1.3
Net cash used in investing activities	(443.4)	(350.5)	(381.3)
Financing Activities:
Issuance of long-term debt	400.0	300.0	304.1
Repayment of long-term debt	(250.0)	0.0	(55.0)
(Repayment) Issuance of short-term debt, net	0.0	(250.0)	250.0
Issuance of common stock	38.7	51.1	0.0
Dividends paid on common stock	(57.0)	0.0	0.0
Other financing activities	(3.9)	(2.2)	(3.5)
Net cash provided by financing activities	223.1	303.3	435.3
Net Increase in Cash, Cash Equivalents, and Restricted Cash	0.8	0.0	0.0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	0.0	0.0	0.0
Cash, Cash Equivalents, and Restricted Cash at End of Year	0.8	0.0	0.0
Borrowings from (repayments to) Spire, net	95.3	204.4	(60.3)
(Repayments to) borrowings from Spire, net	95.3	204.4	(60.3)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(93.8)	(58.9)	(45.9)
Income taxes	(0.2)	0.0	0.0
Spire Alabama Inc [Member]
Operating Activities:
Net Income	66.0	68.5	73.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69.3	66.8	62.1
Deferred income taxes and investment tax credits	20.3	23.2	25.0
Changes in assets and liabilities:
Accounts receivable	27.1	(21.2)	(17.8)
Inventories	17.2	(42.5)	(15.4)
Regulatory assets and liabilities	(49.5)	(101.7)	29.2
Accounts payable	(42.3)	26.3	14.0
Delayed/advance customer billings, net	(0.6)	0.5	0.5
Taxes accrued	3.3	0.8	2.5
Other assets and liabilities	18.7	(3.7)	(37.8)
Other	0.4	0.2	0.3
Net cash provided by operating activities	129.9	17.2	136.4
Delayed/advance customer billings	(0.6)	0.5	0.5
Investing Activities:
Capital expenditures	(117.6)	(141.5)	(169.8)
Other	1.3	0.8	0.7
Net cash used in investing activities	(116.3)	(140.7)	(169.1)
Financing Activities:
Issuance of long-term debt	175.0	0.0	150.0
Repayment of long-term debt	0.0	(50.0)	0.0
Dividends paid on common stock	(21.0)	(24.0)	(22.0)
Other financing activities	(1.0)	0.0	(0.9)
Net cash provided by financing activities	(14.8)	125.9	32.7
Net Increase in Cash, Cash Equivalents, and Restricted Cash	(1.2)	2.4	0.0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	2.4	0.0	0.0
Cash, Cash Equivalents, and Restricted Cash at End of Year	1.2	2.4	0.0
Borrowings from (repayments to) Spire, net	(136.8)	211.9	(72.4)
(Repayments to) borrowings from Spire, net	(136.8)	211.9	(72.4)
Return of capital to Spire	(31.0)	(12.0)	(22.0)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(30.1)	(21.0)	(17.9)
Income taxes	$ 0.0	$ 0.0	$ 0.0

[1] Accumulated other comprehensive income (loss)

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Note 1 - Summary of Significant Accounting Policies

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Significant Accounting Policies [Text Block]

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION – These notes are an integral part of the accompanying audited financial statements of Spire Inc. (“Spire” or the “Company”) presented on a consolidated basis, Spire Missouri Inc. (“Spire Missouri”) and Spire Alabama Inc. (“Spire Alabama”). Spire Missouri, Spire Alabama and Spire EnergySouth Inc. (“Spire EnergySouth”) are wholly owned subsidiaries of Spire. Spire Missouri, Spire Alabama and the subsidiaries of Spire EnergySouth (Spire Gulf Inc. and Spire Mississippi Inc.) are collectively referred to as the “Utilities.” Unless otherwise indicated, references to years herein are references to the fiscal years ending September 30 for the Company and its subsidiaries.

The accompanying audited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial position, results of operations and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not been eliminated from their separate financial statements.

NATURE OF OPERATIONS – Spire has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment consists of the regulated natural gas distribution operations of the Company and is the core business segment of Spire in terms of revenue and earnings. The Gas Utility segment is comprised of the operations of: Spire Missouri, serving St. Louis, Kansas City, and other areas in Missouri; Spire Alabama, serving central and northern Alabama; and the subsidiaries of Spire EnergySouth, serving the Mobile, Alabama area and south-central Mississippi. The Gas Marketing segment includes Spire’s primary gas-related business, Spire Marketing Inc. (“Spire Marketing”), which provides non-regulated natural gas services throughout the United States (U.S.). The Midstream segment includes Spire STL Pipeline and Spire Storage, which are subsidiaries engaged in the transportation and storage of natural gas. The activities of the Company’s other subsidiaries are reported as Other and are described in Note 14, Information by Operating Segment. Spire Missouri and Spire Alabama each have a single reportable segment.

USE OF ESTIMATES – The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

SYSTEM OF ACCOUNTS – The accounts of the Utilities are maintained in accordance with the Uniform System of Accounts prescribed by the applicable state public service commissions, which systems substantially conform to that prescribed by the Federal Energy Regulatory Commission (FERC).

REGULATED OPERATIONS – The Utilities account for their regulated operations in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 980, Regulated Operations. This topic sets forth the application of GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. The provisions of this accounting guidance require, among other things, that financial statements of a regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. In addition, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities). Management believes that the current regulatory environment supports the continued use of these regulatory accounting principles and that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process. See additional discussion on regulated operations in Note 15, Regulatory Matters.

PROPERTY, PLANT, AND EQUIPMENT –

Utility Plant – Utility plant is stated at original cost. The cost of additions to utility plant includes contracted work, direct labor and materials, allocable overheads and an allowance for funds used during construction. The costs of units of property retired, replaced or renewed are removed from utility plant and are charged to accumulated depreciation. Maintenance and repairs of property and replacement and renewal of items determined to be less than units of property are charged to maintenance expenses.

Utility plant is depreciated using the composite method on a straight-line basis over the estimated service lives of the various classes of property at rates approved by the applicable regulatory commission. For Spire Missouri and for Spire Alabama, the annual depreciation and amortization expense in fiscal years 2023, 2022 and 2021 averaged approximately 3% of the original cost of depreciable and amortizable property.

Non-utility Property – Non-utility property is recorded at the original cost of acquisition or construction, which includes material, labor, contractor services and, for FERC-regulated projects, an allowance for funds used during construction. Repairs, replacements and renewals of items of property determined to be less than a unit of property or that do not increase the property’s life or functionality are charged to maintenance expense. Upon retirement or sale of non-utility property, the original cost and related accumulated depreciation are removed from the accounts and any gain or loss is included in the income statements. Costs related to software developed or obtained for internal use are capitalized and amortized on a straight-line basis over the estimated useful life of the related software. If software is retired prior to being fully amortized, the difference is recorded as a loss in the income statements.

Accrued Capital Expenditures – Accrued capital expenditures, shown in the following table, are excluded from capital expenditures in the statements of cash flows until paid.

September 30	2023		2022		2021
Spire	$	104.3	$	77.8	$	59.5
Spire Missouri		56.5		45.6		37.1
Spire Alabama		4.6		19.2		13.6

ASSET RETIREMENT OBLIGATIONS – Spire, Spire Missouri and Spire Alabama record legal obligations associated with the retirement of long-lived assets in the period in which the obligations are incurred, if sufficient information exists to reasonably estimate the fair value of the obligations. Obligations are recorded as both a cost of the related long-lived asset and as a corresponding liability. Subsequently, the asset retirement costs are depreciated over the life of the asset and the asset retirement obligations are accreted to the expected settlement amounts. Spire, Spire Missouri and Spire Alabama record asset retirement obligations associated with certain safety requirements to purge and seal gas distribution mains upon retirement, the plugging and abandonment of storage wells and other storage facilities, specific service line obligations, and certain removal and disposal obligations related to components of Spire Missouri’s, Spire Alabama’s and Spire Gulf’s distribution systems and general plant. Asset retirement obligations recorded by Spire’s other subsidiaries are not material. As authorized by the Missouri Public Service Commission (MoPSC) and the Alabama Public Service Commission (APSC), Spire Missouri, Spire Alabama and Spire Gulf accrue future asset removal costs associated with their property, plant and equipment even if a legal obligation does not exist. Such accruals are provided for through depreciation expense and are recorded with corresponding credits to regulatory liabilities or regulatory assets. When those utilities retire depreciable utility plant and equipment, they charge the associated original costs to accumulated depreciation and amortization, and any related removal costs incurred are charged to regulatory liabilities or regulatory assets. The difference between removal costs recognized in depreciation rates and the accretion expense and depreciation expense recognized for financial reporting purposes is a timing difference between recovery of these costs in rates and their recognition for financial reporting purposes. Accordingly, these differences are deferred as regulatory liabilities or regulatory assets. In the rate setting process, the regulatory liabilities or regulatory assets are excluded from the rate base upon which those utilities have the opportunity to earn their allowed rates of return.

The following table presents a reconciliation of the beginning and ending balances of asset retirement obligations at September 30, as reported in the balance sheets.

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Asset retirement obligations, beginning of year	$	520.9		$	519.6		$	110.6		$	143.4		$	398.7		$	362.8
Liabilities incurred during the period		7.9			3.2			0.9			1.2			2.0			0.5
Liabilities settled during the period		(6.8	)		(9.2	)		(2.5	)		(4.1	)		(2.5	)		(2.0	)
Accretion		21.5			21.1			4.5			5.9			16.5			14.7
Revisions in estimated cash flows		33.9			(13.8	)		(2.4	)		(35.8	)		36.3			22.7
Asset retirement obligations, end of year	$	577.4		$	520.9		$	111.1		$	110.6		$	451.0		$	398.7

NATURAL GAS AND PROPANE GAS – For Spire Missouri’s eastern region, inventory of natural gas in storage is priced on a last in, first out (LIFO) basis and inventory of propane gas in storage is priced on a first in, first out (FIFO) basis. For the rest of the Gas Utility segment, inventory of natural gas in storage is priced on the weighted average cost basis. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2023 was less than the LIFO cost by $21.1. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2022 was more than the LIFO cost by $37.3. The carrying value of the Utilities’ inventory is never adjusted to a lower net realizable value or market value because, pursuant to Purchased Gas Adjustment (PGA) clauses or a Gas Supply Adjustment (GSA) rider, actual gas costs are recovered in customer rates. Natural gas and propane gas storage inventory in Spire’s other operating segments is recorded at the lower of average cost or net realizable value.

BUSINESS COMBINATIONS AND GOODWILL – Spire’s acquisitions were accounted for using business combination accounting. Under this method, the purchase price paid by the acquirer is allocated to the assets acquired and liabilities assumed as of the acquisition date based on their fair value. Goodwill is measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. At September 30, 2023, goodwill included in Spire’s Gas Utility, Gas Marketing, and Midstream segments was $210.2, zero, and zero, respectively, with the remainder held at the corporate level. Goodwill amounts have not changed since fiscal 2017, and there are no accumulated impairment losses. Spire and Spire Missouri evaluate goodwill for impairment as of July 1 of each year, or more frequently if events and circumstances indicate that goodwill might be impaired. At each test date, the assessments concluded that goodwill was not impaired. The Company updated the assessments as of September 30, 2023, determining that it remained more likely than not that the fair value of each reporting unit exceeded its carrying value.

A subsidiary of Spire in the Midstream segment acquired a natural gas storage facility in northern Oklahoma, now named Spire Storage Salt Plains LLC, on April 1, 2023. The $37 purchase price was fully allocated to the assets acquired and liabilities assumed based on their fair value at the acquisition date, consisting almost entirely of base gas and other property, plant and equipment, resulting in no goodwill.

IMPAIRMENT OF LONG-LIVED ASSETS – Long-lived assets classified as held and used are evaluated for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. Whether impairment has occurred is determined by comparing the estimated undiscounted cash flows attributable to the assets with the carrying value of the assets. If the carrying value exceeds the undiscounted cash flows, the Company recognizes an impairment charge equal to the amount of the carrying value that exceeds the estimated fair value of the assets. In the period in which the Company determines an asset meets held-for-sale criteria, an impairment charge is recorded to the extent the book value exceeds its fair value less cost to sell.

DERIVATIVES – In the course of their business, certain subsidiaries of Spire enter into commitments associated with the purchase or sale of natural gas. Certain of their derivative natural gas contracts are designated as normal purchases or normal sales and, as such, are excluded from the scope of FASB ASC Topic 815, Derivatives and Hedging. Those contracts are accounted for as executory contracts and recorded on an accrual basis. Revenues and expenses from such contracts are recorded gross. Contracts not designated as normal purchases or normal sales are recorded as derivatives with changes in fair value recognized in earnings in the periods prior to physical delivery. Certain of Spire Marketing’s wholesale purchase and sale transactions are classified as trading activities for financial reporting purposes, with income and expenses presented on a net basis in natural gas expenses in the Consolidated Statements of Income. Spire also enters into cash flow hedges through execution of interest rate swap contracts to protect itself against adverse movements in interest rates. Refer to Note 10, Derivative Instruments and Hedging Activities, for more information about derivatives.

INCOME TAXES – Spire and its subsidiaries account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and the respective tax basis and for tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be realized or settled. The effects on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income or loss for non-regulated operations, and in a regulatory asset or regulatory liability for regulated operations. A valuation allowance is established when it is more likely than not that some portion or all of the deferred tax assets will not be realized.

The Company accounts for uncertain tax positions in accordance with authoritative guidance. The authoritative guidance addresses the determination of whether tax benefits claimed, or expected to be claimed, on a tax return should be recorded in the financial statements. Spire may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the position will be sustained upon examination by the taxing authority, based on the technical merits of the position. Tax-related interest and penalties, if any, are classified as a liability on the balance sheets. For additional information on the accounting for income taxes, refer to Note 12, Income Taxes.

CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – All highly liquid debt instruments purchased with original maturities of three months or less are considered to be cash equivalents. Such instruments are carried at cost, which approximates market value. Outstanding checks on the Company’s and Utilities’ bank accounts in excess of funds on deposit create book overdrafts (which are funded at the time checks are presented for payment) and are classified as Other in the Current Liabilities section of the balance sheets. Changes in book overdrafts are reflected as Operating Activities in the statements of cash flows. In Spire’s statements of cash flows, total Cash, Cash Equivalents, and Restricted Cash included $20.2 and $14.0 of restricted cash reported in “Other Investments” on the Company’s balance sheet as of September 30, 2023 and 2022, respectively (in addition to amounts shown as “Cash and cash equivalents”). This restricted cash has been segregated and invested in debt securities in a trust account based on collateral requirements for reinsurance at Spire’s risk management company.

NATURAL GAS RECEIVABLE – Spire Marketing enters into natural gas transactions with natural gas pipeline and storage companies known as park and loan arrangements. Under the terms of the arrangements, Spire Marketing purchases natural gas from a third party and delivers that natural gas to the pipeline or storage company for the right to receive the same quantity of natural gas from that company at the same location in a future period. These arrangements are accounted for as non-monetary transactions under GAAP and are recorded at the carrying amount. As such, natural gas receivables are reflected in “Other” current assets on the Consolidated Balance Sheets at cost, which includes related fees associated with the transactions. In the period that the natural gas is returned to Spire Marketing, concurrent with the sale of the natural gas to a third party, the related natural gas receivable is expensed in the Consolidated Statements of Income. In conjunction with these transactions, Spire Marketing usually enters into New York Mercantile Exchange (NYMEX) and Intercontinental Exchange (ICE) natural gas futures, options, and swap contracts or fixed price sales agreements to protect against market changes in future sales prices.

EARNINGS PER COMMON SHARE – GAAP requires dual presentation of basic and diluted earnings per share (EPS). EPS is computed using the two-class method, which is an earnings allocation method for computing EPS that treats a participating security as having rights to earnings that would otherwise have been available to common shareholders. Certain of the Company’s stock-based compensation awards pay non-forfeitable dividends to the participants during the vesting period and, as such, are deemed participating securities. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding that are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common shares, pursuant to the treasury stock method. Shares attributable to equity units, non-participating performance-contingent restricted stock awards, and time-vested restricted stock/units are excluded from the calculation of diluted earnings per share if the effect would be antidilutive. Shares attributable to non-participating performance-contingent restricted stock awards are only included in the calculation of diluted earnings per share to the extent the underlying performance and/or market conditions are satisfied (a) prior to the end of the reporting period or (b) would be satisfied if the end of the reporting period were the end of the related contingency period and the result would be dilutive. The Company’s EPS computations are presented in Note 4, Earnings Per Common Share.

TRANSACTIONS WITH AFFILIATES – Transactions between affiliates of the Company have been eliminated from the consolidated financial statements of Spire. Spire Missouri and Spire Alabama borrowed funds from the Company and incurred related interest, as reflected in their separate financial statements, and they participated in normal intercompany shared services transactions. In addition, Spire Missouri’s and Spire Alabama’s other transactions with affiliates included: 

	Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021
Natural gas purchases from Spire Marketing	$	57.4	$	86.3	$	92.5	$	4.7	$	3.2	$	10.4
Natural gas sales to Spire Marketing		0.4		—		1.1		—		0.5		0.1
Transportation services from Spire STL Pipeline LLC		32.0		32.0		32.0		—		—		—
Natural gas storage services from Spire Storage Salt Plains LLC		0.7		—		—		—		—		—
Transportation services from Spire NGL Inc.		—		—		0.5		—		—		—

ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES – Trade accounts receivable are recorded at the amounts due from customers, including unbilled amounts. Accounts receivable are written off when they are deemed to be uncollectible. An allowance for expected credit losses is estimated and updated based on relevant data and trends such as accounts receivable aging, historical write-off experience, current write-off trends, economic conditions, and the impact of weather and availability of customer payment assistance on collection trends. For the Utilities, net write-offs as a percentage of revenue has historically been the best predictor of base net write-off experience over time. Management judgment is applied in the development of the allowance due to the complexity of variables and subjective nature of certain relevant factors. The accounts receivable of Spire’s non-utility businesses are evaluated separately from those of the Utilities. The allowance for credit losses for those other businesses is based on a continuous evaluation of the individual counterparty risk and is not significant for the periods presented. Activity in the allowance for credit losses is shown in the following table.

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Allowance at beginning of year	$	31.9		$	30.3		$	24.9		$	24.9		$	22.6		$	18.1		$	6.3		$	6.6		$	5.5
Provision for expected credit losses		16.6			11.6			14.7			13.3			11.2			11.1			2.6			0.3			3.1
Write-offs, net of recoveries		(16.0	)		(10.0	)		(9.3	)		(12.0	)		(8.9	)		(6.6	)		(3.2	)		(0.6	)		(2.0	)
Allowance at end of year	$	32.5		$	31.9		$	30.3		$	26.2		$	24.9		$	22.6		$	5.7		$	6.3		$	6.6

FINANCE RECEIVABLES – Spire Alabama finances third party contractor sales of merchandise including gas furnaces and appliances. At September 30, 2023 and 2022, Spire Alabama’s finance receivable totaled approximately $6.7 and $7.1, respectively. Financing is available only to qualified customers who meet creditworthiness thresholds for customer payment history and external agency credit reports. Spire Alabama relies upon ongoing payments as the primary indicator of credit quality during the term of each contract. The allowance for credit losses is recognized using an estimate of write-off percentages based on historical experience. Delinquent accounts are evaluated on a case-by-case basis and, absent evidence of debt repayment, after 90 days are due in full and assigned to a third-party collection agency. The remaining finance receivable is written off approximately 12 months after being assigned to the third-party collection agency. Spire Alabama had finance receivables past due 90 days or more of $0.3 at September 30, 2023 and 2022.

GROUP MEDICAL AND WORKERS’ COMPENSATION RESERVES – The Company self-insures its group medical and workers’ compensation costs and carries stop-loss coverage in relation to medical claims and workers’ compensation claims. Reserves for amounts incurred but not reported are established based on historical cost levels and lags between occurrences and reporting.

FAIR VALUE MEASUREMENTS – Certain assets and liabilities are recognized or disclosed at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). GAAP establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.

The levels of the hierarchy are described below:

• Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.

• Level 2 – Pricing inputs other than quoted prices included within Level 1, which are either directly or indirectly observable for the asset or liability as of the reporting date. These inputs are derived principally from, or corroborated by, observable market data.

• Level 3 – Pricing that is based upon inputs that are generally unobservable that are based on the best information available and reflect management’s assumptions about how market participants would price the asset or liability.

Assessment of the significance of a particular input to the fair value measurements may require judgment and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. Additional information about fair value measurements is provided in Note 8, Fair Value of Financial Instruments, Note 9, Fair Value Measurements, and Note 13, Pension Plans and Other Postretirement Benefits.

STOCK-BASED COMPENSATION – The Company accounts for share-based compensation arrangements in accordance with ASC Topic 718, Compensation - Stock Compensation. The Company measures stock-based compensation awards at fair value at the date of grant and recognizes the compensation cost of the awards over the requisite service period. Forfeitures are recognized in the period they occur. Refer to Note 3, Stock-Based Compensation, for further discussion of the accounting for the Company’s stock-based compensation plans.

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Note 2 - Revenue

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

2. REVENUE

The following tables show revenue disaggregated by source and customer type.

	2023			2022			2021
Spire
Gas Utility:
Residential	$	1,648.5		$	1,416.6		$	1,234.0
Commercial & industrial		606.0			338.9			586.0
Transportation		121.6			118.0			122.9
Off-system & other incentive		30.0			42.0			152.7
Other customer revenue		16.1			19.9			22.2
Total revenue from contracts with customers		2,422.2			1,935.4			2,117.8
Changes in accrued revenue under alternative revenue programs		34.7			10.7			1.5
Total Gas Utility operating revenues		2,456.9			1,946.1			2,119.3
Gas Marketing		179.1			234.9			96.5
Midstream		66.1			53.1			52.6
Other		16.7			16.1			15.1
Total before eliminations		2,718.8			2,250.2			2,283.5
Intersegment eliminations (see Note 14, Information by Operating Segment)		(52.5	)		(51.7	)		(48.0	)
Total Operating Revenues	$	2,666.3		$	2,198.5		$	2,235.5
Spire Missouri
Residential	$	1,261.3		$	1,061.4		$	882.1
Commercial & industrial		411.9			177.2			436.1
Transportation		33.2			33.3			33.5
Off-system & other incentive		20.1			25.2			145.6
Other customer revenue		12.5			11.1			16.3
Total revenue from contracts with customers		1,739.0			1,308.2			1,513.6
Changes in accrued revenue under alternative revenue programs		23.9			12.8			3.0
Total Operating Revenues	$	1,762.9		$	1,321.0		$	1,516.6
Spire Alabama
Residential	$	322.9		$	291.6		$	288.0
Commercial & industrial		150.4			119.1			114.9
Transportation		77.6			74.4			78.7
Off-system & other incentive		9.9			16.8			7.1
Other customer revenue		3.6			5.5			1.9
Total revenue from contracts with customers		564.4			507.4			490.6
Changes in accrued revenue under alternative revenue programs		6.7			1.7			3.4
Total Operating Revenues	$	571.1		$	509.1		$	494.0

The Utilities sell natural gas to residential and other customers. The sale of natural gas is governed by the various state utility commissions, which set rates, charges, and terms and conditions of service, collectively included in a “tariff.” The performance obligation, which relates to the promise to provide natural gas, is satisfied over time as the customer simultaneously receives and consumes the natural gas, and revenue is recognized accordingly.

The Utilities’ transportation revenue relates to the promise to transport the specified quantities of natural gas at tariff rates. This performance obligation is satisfied over time as the gas is transported, and revenue is recognized as invoiced monthly.

The Utilities have alternative revenue programs (ARPs), which represent an agreement between the utility and its regulator, currently consisting of decoupling mechanisms (also known as weather normalization adjustments) and incentive programs (primarily Alabama’s Cost Control Measure). When the criteria to recognize additional (or reduced) revenue from ARPs have been met, the Utilities establish a regulatory asset (or liability). When amounts previously recognized for ARPs are billed, the Utilities reduce the regulatory asset (or liability) and increase (or decrease) accounts receivable. Billed amounts, which are part of the overall tariff paid by customers, are included in revenue from contracts with customers, while the change in the related regulatory asset or liability is presented as revenue from ARPs. Depending on whether the beginning accrued ARP balance was a regulatory asset or liability and depending on the size and direction of the current period accrual, the amount presented as revenue from ARPs could be negative.

The Utilities read meters and bill customers on monthly cycles. Spire Missouri, Spire Gulf and Spire Mississippi record their gas utility revenues from gas sales and transportation services on an accrual basis that includes estimated amounts for gas delivered but not yet billed. The accruals for unbilled revenues are reversed in the subsequent accounting period when meters are actually read and customers are billed. Spire Alabama records natural gas distribution revenues in accordance with the tariff established by the APSC. Unbilled revenue is accrued in an amount equal to the related gas cost, as profit margin is not considered earned until billed. Spire’s other subsidiaries, including Spire Marketing, record revenues when earned, as the product is delivered or as services are performed.

Gas Marketing’s contracts are derivatives. Wholesale contracts (with producers, municipalities, and utility companies) are subject to derivative accounting. Retail contracts (with large commercial and industrial customers) are designated as “normal purchase, normal sale” arrangements and are therefore accounted for as revenue from contracts with customers. The performance obligation is satisfied over time by the transfer of control of natural gas to the customer, and revenue is recognized as invoiced monthly.

Payments are generally required within 30 days of billing, and contracts generally do not have a significant financing component. Spire’s revenues are not subject to significant returns, refunds, or warranty obligations.

Spire, Spire Missouri, and Spire Alabama have elected to apply a “right to invoice” practical expedient, recognizing revenue for volumes delivered for which they have a right to invoice, as long as that amount corresponds with the value to the customer. Disclosures about remaining performance obligations are not required because either contracts have an original expected duration of one year or less, or revenue is recognized under the right to invoice practical expedient, or both.

Sales taxes imposed on applicable Spire Alabama and Spire Missouri sales are billed to customers. These amounts are not recorded in the statements of income but are recorded as tax collections payable and included in the “Other” line of the Current Liabilities section of the balance sheets.

Gross receipts taxes associated with the Company’s natural gas utility services are imposed on the Company, Spire Missouri, and Spire Alabama and billed to its customers. The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.”

	2023		2022		2021
Spire	$	131.8	$	109.8	$	94.0
Spire Missouri		96.7		79.6		64.3
Spire Alabama		29.9		25.5		25.1

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Note 3 - Stock-based Compensation

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

3. STOCK-BASED COMPENSATION

The Spire 2015 Equity Incentive Plan (EIP) was approved by shareholders of Spire on January 29, 2015 and amended on November 9, 2018. The purpose of the EIP is to encourage directors, officers, and key employees of the Company and its subsidiaries to contribute to the Company’s success and align their interests with that of shareholders. To accomplish this purpose, the Compensation and Human Resources Committee (“Committee”) of Spire’s Board of Directors (the “Board”) may grant awards under the EIP that may be earned by achieving performance objectives and/or other criteria as determined by the Committee. Under the terms of the EIP, officers and employees of the Company and its subsidiaries, as determined by the Committee, are eligible to be selected for awards. The EIP provides for restricted stock, restricted stock units, qualified and non-qualified stock options, stock appreciation rights, and performance shares payable in stock, cash, or a combination of both. The EIP generally provides a minimum vesting period of at least three years for each type of award, with pro rata vesting permitted during the minimum three-year vesting period. The maximum number of shares reserved for issuance under the EIP is 1,000,000.

The Company allows participants in the EIP the ability to defer a portion or all of their award. As of  September 30, 2023, a total of 244,618 share equivalents (at target payout) have been deferred by participants. Such units are included in the data presented below. After the required holding period, deferred awards are ultimately paid in cash rather than in shares of stock. Upon vesting, the Company issues new shares to satisfy awards that are not deferred.

Restricted Stock Awards

During fiscal 2023, the Company granted116,390 performance-contingent restricted share units to executive officers and key employees at a weighted average grant date fair value of $79.88 per share. This number represents the target shares that can be earned pursuant to the terms of the awards. The share units have a performance period ending September 30, 2026. While the participants have no interim voting rights on these share units, dividends accrue during the performance period and are paid to the participants upon vesting but are subject to forfeiture if the underlying share units do not vest.

The number of share units that will ultimately vest is dependent upon the attainment of certain levels of earnings, as well as the Company’s level of total shareholder return (TSR) during the performance period relative to a comparator group of peer companies. This TSR provision is considered a market condition under GAAP and is discussed further below. The maximum amount of shares or share equivalents that can be earned pursuant to the terms of the awards is 200% of the target units granted.

The weighted average grant date fair value of performance-contingent restricted share units granted during fiscal years 2022 and 2021 was $67.43 and $68.69 per share, respectively.

Fiscal 2023 activity of restricted stock units subject to performance and/or market conditions is presented below:

				Weighted
				Average
				Grant Date
				Fair Value
	Units			Per Unit
Non-vested at September 30, 2022		343,524		$	70.14
Granted		116,390		$	79.88
Adjusted for performance		(13,459	)	$	76.91
Vested		(74,556	)	$	76.91
Forfeited		(23,546	)	$	71.73
Non-vested at September 30, 2023		348,353		$	71.76

For the year ended September 30, 2023, the total number of shares or share equivalents that could be issued if all outstanding award grants attain maximum performance payout is 696,706.

During fiscal 2023, the Company granted 55,524 shares of time-vested restricted stock to executive officers and key employees at a weighted average grant date fair value of $71.91 per share. Unless forfeited based on terms of the agreements, these shares will vest in fiscal 2025. In the interim, participants receive full voting rights and dividends, which are not subject to forfeiture. The weighted average grant date fair value of time-vested restricted stock and restricted stock units awarded to employees during fiscal years 2022 and 2021 was $63.57 and $64.29 per share, respectively.

During fiscal 2023, the Company granted 12,720 shares of time-vested restricted stock to non-employee directors at a weighted average grant date fair value of $75.59 per share. These shares vested in fiscal 2023, six months after the grant date. The weighted average grant date fair value of restricted stock awarded to non-employee directors during fiscal years 2022 and 2021 was $66.31 and $62.35 per share, respectively.

Time-vested restricted stock and stock unit activity for fiscal 2023 is presented below:

				Weighted
				Average
				Grant Date
	Shares/			Fair Value
	Units			Per Share
Non-vested at September 30, 2022		122,245		$	66.60
Granted		68,244		$	72.60
Vested		(59,040	)	$	75.27
Forfeited		(8,460	)	$	65.36
Non-vested at September 30, 2023		122,989		$	65.85

For restricted stock and stock units (performance-contingent and time-vested) that vested during fiscal years 2023, 2022, and 2021, the Company withheld 18,428 shares, 28,055 shares, and 16,787 shares, respectively, at weighted average prices of $72.03, $63.97 and $65.99 per share, respectively, pursuant to elections by employees to satisfy tax withholding obligations. The total fair value of restricted stock (performance-contingent and time-vested) that vested during fiscal years 2023, 2022, and 2021 was $8.6, $10.1, and $6.5, respectively, and the related tax benefit was $3.2, $3.8, and $2.5, respectively. None of the tax benefits have been realized.

Equity Compensation Costs

Compensation cost for performance-contingent restricted stock and stock unit awards is based upon the probable outcome of the performance conditions. For shares or units that do not vest or that are not expected to vest due to the outcome of the performance conditions (excluding market conditions), no compensation cost is recognized and any previously recognized compensation cost is reversed.

The fair value of awards of performance-contingent and time-vested restricted stock and restricted stock units, not subject to the TSR provision, are estimated using the closing price of the Company’s stock on the grant date. For those awards that do not pay dividends during the vesting period, the estimate of fair value is reduced by the present value of the dividends expected to be paid on the Company’s common stock during the performance period, discounted using an appropriate U.S. Treasury yield. For shares subject to the TSR provision, the estimated impact of this market condition is reflected in the grant date fair value per share of the awards. Accordingly, compensation cost is not reversed to reflect any actual reductions in the awards that may result from the TSR provision. However, if the Company’s TSR during the performance period ranks below the level specified in the award agreements, relative to a comparator group of companies, and the Committee elects not to reduce the award (or reduce by a lesser amount), this election would be accounted for as a modification of the original award and additional compensation cost would be recognized at that time. The grant date fair value of the awards subject to the TSR provision awarded during fiscal years 2023, 2022 and 2021 was valued by a Monte Carlo simulation model that assessed the probabilities of various TSR outcomes. The significant assumptions used in the Monte Carlo simulations are as follows:

	2023		2022		2021
Risk-free interest rate		4.26%		0.79%		0.22%
Expected dividend yield of stock		—		—		—
Expected volatility of stock		33.8%		32.2%		31.4%
Performance period (in years)		3.0		3.0		3.0

The risk-free interest rate was based on the yield on U.S. Treasury securities matching the vesting period. A zero-percent dividend yield was used, which is mathematically equivalent to the assumption that dividends are reinvested as they are paid. The expected volatility is based on the historical volatility of the Company’s stock. Volatility assumptions were also made for each of the companies included in the comparator group. The vesting period is equal to the performance period set forth in the terms of the award.

The amounts of compensation cost recognized for share-based compensation arrangements are presented below:

	2023			2022			2021
Total compensation cost	$	11.2		$	7.5		$	16.6
Compensation cost capitalized		(1.4	)		(1.1	)		(2.7	)
Compensation cost recognized in net income		9.8			6.4			13.9
Income tax benefit recognized in net income		(2.2	)		(1.5	)		(3.2	)
Compensation cost recognized in net income, net of income tax	$	7.6		$	4.9		$	10.7

As of September 30, 2023, there was $12.1 of total unrecognized compensation cost related to non-vested share-based compensation arrangements, which is expected to be recognized over a weighted average period of 1.7 years.

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Note 4 - Earnings Per Common Share

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Earnings Per Share [Text Block]

4. EARNINGS PER COMMON SHARE

		2023		2022		2021
Basic Earnings Per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Basic Earnings Per Share of Common Stock		$	3.86	$	3.96	$	4.97
Diluted Earnings per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)*			0.1		0.1		0.1
Weighted Average Diluted Common Shares (in millions)			52.6		52.1		51.7
Diluted Earnings Per Share of Common Stock		$	3.85	$	3.95	$	4.96
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to common stock forward contracts, stock units subject to performance or market conditions, and restricted stock, which could have a dilutive effect in the future			1.9		0.1		0.1

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Note 5 - Shareholders' Equity

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Equity [Text Block]

5. SHAREHOLDERS’ EQUITY

Spire

Preferred Stock

At September 30, 2023 and 2022, Spire had authorized 5,000,000 shares of preferred stock.

On May 21, 2019, Spire completed the public offering of 10,000,000 depositary shares (the “Depositary Shares”), each representing a 1/1,000th interest in a share of the Company’s 5.90% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $25.00 per share, with a liquidation preference of $25,000 per share (the “Preferred Stock”). The transaction resulted in $242.0 of net proceeds, after deducting commissions and sale expenses, which proceeds were used to (i) refinance long-term and short-term Spire debt and (ii) fund capital expenditures at both the Utilities and Spire’s gas-related businesses.

Dividends on the Preferred Stock, when declared by the Board, are payable on the liquidation preference amount, on a cumulative basis, quarterly in arrears on the 15th day of February, May, August and November of each year, beginning on August 15, 2019. Dividends are payable out of amounts legally available for the payment of dividends at an annual rate equal to 5.90% of the liquidation preference per share of Preferred Stock (equivalent to $25.00 per Depositary Share). Dividends accumulate daily and are cumulative from May 21, 2019.

Under the terms of the Preferred Stock, the Company’s ability to declare or pay dividends on, or purchase or redeem, shares of its common stock or any class or series of capital stock of the Company that rank junior to the Preferred Stock are subject to certain restrictions in the event that the Company does not declare and pay the full cumulative dividends on the Preferred Stock through the most recently completed quarterly dividend period.

Spire may, at its option, redeem the Preferred Stock (i) in whole, but not in part, at any time prior to August 15, 2024, within 120 days after a ratings event where a rating agency amends, clarifies or changes the criteria it uses to assign equity credit for securities such as the Preferred Stock, at a redemption price in cash equal to $25,500 per share, or (ii) in whole or in part, from time to time, on or after August 15, 2024, at a redemption price in cash equal to $25,000 per share, plus, in each case, all accumulated and unpaid dividends (whether declared or not) up to such redemption date.

Shareholders of the Preferred Stock generally have no voting rights with respect to matters that generally require the approval of voting stockholders. The limited voting rights of holders of the Preferred Stock include the right to vote on certain matters that may affect the preference or special rights of the Preferred Stock. In addition, if and whenever dividends on any shares of Preferred Stock have not been declared and paid for at least six dividend periods, whether or not consecutive, the number of directors then constituting the Board shall automatically be increased by two (to be elected by the holders of the Preferred Stock) until all accumulated and unpaid dividends on the Preferred Stock have been paid in full.

Equity Units

In February 2021, Spire issued 3.5 million equity units, initially in the form of Corporate Units, for an aggregate stated amount of $175.0, resulting in net proceeds (after underwriting fees and other issuance costs) of $169.3. Each “Corporate Unit” has a stated amount of fifty dollars and consists of (i) a stock purchase contract and (ii) a 1/20, or 5%, undivided beneficial ownership interest in one thousand dollars principal amount of Spire’s 2021 Series A 0.75% Remarketable Senior Notes due March 1, 2026 (RSNs). The RSNs are pledged as collateral to secure the holder’s obligation under the related stock purchase contracts. Each stock purchase contract obligates the holder to purchase, and Spire to issue and deliver, on March 1, 2024, for a price of fifty dollars in cash, a variable number of shares of its common stock as follows (subject to anti-dilution adjustments).

If the applicable market value* per share	Number of shares to be purchased per
of Spire common stock is:	stock purchase contract is:
Equal to or greater than $78.6906 (“threshold appreciation price”)	0.6354 (“minimum settlement rate”)
Less than $78.6906, but greater than $64.24	$50.00 ÷ applicable market value*
Less than or equal to $64.24 (“reference price”)	0.7783 (“maximum settlement rate”)

*Based on the volume-weighted average price of Spire common stock during the 20 trading days before settlement.

If a holder elects to settle purchase contracts early, the holder would pay fifty dollars per unit and receive 0.6354 shares per unit.

The Company makes quarterly interest payments on the RSNs at the rate of 0.75% per year and quarterly contract adjustment payments on the stock purchase contracts at the rate of 6.75%. The RSNs and the contract adjustment payments are structurally subordinated to all liabilities of Spire’s subsidiaries.

At issuance, the Company recorded the $35.0 present value of the stock purchase contract payments as a liability (reflected in “Other” current and noncurrent liabilities on the balance sheet) offset by a charge to additional paid-in capital in equity. This noncash financing activity has been excluded from the statement of cash flows. Interest payments on the RSNs are recorded as interest expense and stock purchase contract payments are charged against the liability. Accretion of the stock purchase contract liability is recorded as imputed interest expense. In calculating diluted EPS, the Company applies the treasury stock method to the Corporate Units. These securities have not had an effect on diluted EPS.

In order to secure funds necessary for the holders to pay the purchase price of the common stock on the purchase contract settlement date, the remarketing agent will remarket the RSNs on behalf of the current holders to new third-party investors. Following any successful remarketing of the RSNs, the interest rate on the RSNs will be reset, interest will be payable on a semi-annual basis, and Spire will cease to have the option to redeem the RSNs, other than in connection with the occurrence or continuance of certain special events.

ATM Program

On February 6, 2019, Spire entered into an “at-the-market” (ATM) equity distribution agreement, supplemented as of  May 14, 2019, pursuant to which the Company  may offer and sell, from time to time, shares of its common stock (including shares of common stock that  may be sold pursuant to forward sale agreements entered into in connection with the ATM equity distribution agreement). On  April 28, 2022, Spire's board approved a new authorization for the sale of additional shares with an aggregate offering price of up to $200.0 through  May 2025.

Settled sales under this ATM program are included in “Common stock issued” in the Condensed Consolidated Statements of Shareholders’ Equity. Also, in the second and third quarters of fiscal 2023, Spire executed forward sale agreements for 228,690 shares and 2,087,231 shares, respectively, of its common stock. On September 27, 2023, 571,372 of these shares were settled, generating $38.5 of net proceeds. The third quarter forward sales included a block sale of 1,744,549 shares which must be settled on or before  December 28, 2023. Had all shares under this forward agreement been settled as of  September 30, 2023, it would have generated net proceeds of $111.2.

As of  September 30, 2023, under the ATM program, Spire  may sell additional shares with an aggregate offering price of up to $17.9.

Other Equity Information

Spire has a shelf registration statement on Form S-3 on file with the U.S. Securities and Exchange Commission (SEC) for the issuance and sale of up to 250,000 shares of common stock under its Dividend Reinvestment and Direct Stock Purchase Plan. There were 244,182 and 237,891 shares at September 30, 2023 and November 10, 2023, respectively, remaining available for issuance under this Form S-3. Spire also has a universal shelf registration statement on Form S-3 on file with the SEC for the issuance of various equity and debt securities, which expires on May 9, 2025.

Spire Missouri

Substantially all of Spire Missouri’s plant is subject to the liens of its first mortgage bonds. The mortgage contains several restrictions on Spire Missouri’s ability to pay cash dividends on its common stock or to make loans to its parent company. These mortgage restrictions are applicable regardless of whether the stock is publicly held or held solely by Spire Missouri’s parent company. Under the most restrictive of these provisions, no cash dividend may be declared or paid if, after the dividend, the aggregate net amount spent for all dividends after September 30, 1953 would exceed a maximum amount determined by a formula set out in the mortgage. Under that formula, the maximum amount is the sum of $8.0 plus earnings applicable to common stock (adjusted for stock repurchases and issuances) for the period from September 30, 1953 to the last day of the quarter before the declaration or payment date for the dividends. As of September 30, 2023 and 2022, the amount under the mortgage’s formula that was available to pay dividends was $1,678.5 and $1,579.4, respectively. Thus, all of Spire Missouri’s retained earnings were free from such dividend restrictions as of those dates.

Spire Missouri has a universal shelf registration statement on Form S-3 on file with the SEC for the issuance of various equity and debt securities, which expires on May 9, 2025. Effective March 5, 2022, Spire Missouri was authorized by the MoPSC to issue conventional term loans, first mortgage bonds, unsecured debt, preferred stock and common stock in an aggregate amount of up to $800.0 for financings placed any time before December 31, 2024. Under this authorization through  September 30, 2023, Spire Missouri has issued $79.1 of common stock and $400.0 of first mortgage bonds.

At September 30, 2023 and 2022, Spire Missouri had authorized 1,480,000 shares of preferred stock, but none were issued and outstanding.

Spire Alabama

At September 30, 2023 and 2022, Spire Alabama had authorized 120,000 shares of preferred stock, but none were issued and outstanding.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income (AOCI), net of income taxes, recognized in the balance sheets at September 30 were as follows:

	Net		Defined Benefit			Net Unrealized
	Unrealized		Pension and			Gain (Loss) on
	Gain (Loss)		Other			Available-for-
	on Cash Flow		Postretirement			Sale Debt
	Hedges		Benefit Plans			Securities			Total
Spire
Balance at September 30, 2021	$	7.9	$	(4.2	)	$	(0.1	)	$	3.6
Other comprehensive income (loss)		42.5		1.5			(0.4	)		43.6
Balance at September 30, 2022		50.4		(2.7	)		(0.5	)		47.2
Other comprehensive income		0.1		0.2			0.1			0.4
Balance at September 30, 2023	$	50.5	$	(2.5	)	$	(0.4	)	$	47.6
Spire Missouri
Balance at September 30, 2021	$	—	$	(4.2	)	$	—		$	(4.2	)
Other comprehensive income		—		1.5			—			1.5
Balance at September 30, 2022		—		(2.7	)		—			(2.7	)
Other comprehensive income		—		0.2			—			0.2
Balance at September 30, 2023	$	—	$	(2.5	)	$	—		$	(2.5	)

Income tax expense (benefit) recorded for items of other comprehensive income (loss) reported in the statements of comprehensive income is calculated by applying statutory federal, state, and local income tax rates applicable to ordinary income. The tax rates applied to individual items of other comprehensive income (loss) are similar within each reporting period. For the periods presented, Spire Alabama had no AOCI balances.

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Note 6 - Long-term Debt

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Long-Term Debt [Text Block]

6. LONG-TERM DEBT

The composition of long-term debt as of September 30 is shown in the following tables.

	2023			2022
Spire
3.31% Notes Payable, due December 15, 2022	$	—		$	25.0
3.54% Senior Notes, due February 27, 2024		150.0			150.0
0.75% Remarketable Senior Notes, due March 1, 2026		175.0			175.0
3.13% Senior Notes, due September 1, 2026		130.0			130.0
3.93% Senior Notes, due March 15, 2027		100.0			100.0
5.80% Senior Notes, due March 15, 2033		150.0			—
4.70% Senior Notes, due August 15, 2044		250.0			250.0
Total principal of Spire Missouri long-term debt (see below)		1,798.0			1,648.0
Total principal of Spire Alabama long-term debt (see below)		750.0			575.0
Other subsidiaries' long-term debt:
5.00% First Mortgage Bonds, due September 30, 2031		42.0			42.0
2.95% Notes, with annual principal payments through December 2034		117.7			123.9
5.61% First Mortgage Bonds, due October 15, 2037		30.0			—
3.52% First Mortgage Bonds, due September 30, 2049		40.0			40.0
Total principal of long-term debt		3,732.7			3,258.9
Less: Unamortized discounts and debt issuance costs		(22.1	)		(19.2	)
Less: Current portion		(156.6	)		(281.2	)
Long-term debt, excluding current portion	$	3,554.0		$	2,958.5
Spire Missouri
First Mortgage Bonds:
3.40% Series, due August 15, 2023	$	—		$	250.0
Floating Rate Series, due December 2, 2024		300.0			300.0
3.40% Series, due March 15, 2028		45.0			45.0
7.00% Series, due June 1, 2029	19.3			19.3
2.84% Series, due November 15, 2029		275.0			275.0
7.90% Series, due September 15, 2030		30.0			30.0
3.68% Series, due September 15, 2032		50.0			50.0
4.80% Series, due February 15, 2033		400.0			—
6.00% Series, due May 1, 2034		99.3			99.3
6.15% Series, due June 1, 2036		54.5			54.5
4.63% Series, due August 15, 2043		99.9			99.9
4.23% Series, due September 15, 2047		70.0			70.0
3.30% Series, due June 1, 2051		305.0			305.0
4.38% Series, due September 15, 2057		50.0			50.0
Total principal of Spire Missouri long-term debt		1,798.0			1,648.0
Less: Unamortized discounts and debt issuance costs		(12.6	)		(10.3	)
Less: Current portion		—			(250.0	)
Spire Missouri long-term debt, excluding current portion	$	1,785.4		$	1,387.7
Spire Alabama
3.21% Notes, due September 15, 2025	$	35.0		$	35.0
5.32% Notes, due October 15, 2029		90.0			—
2.88% Notes, due December 1, 2029		100.0			100.0
2.04% Notes, due December 15, 2030		150.0			150.0
5.41% Notes, due October 15, 2032		85.0			—
5.90% Notes, due January 15, 2037		45.0			45.0
4.31% Notes, due December 1, 2045		80.0			80.0
3.92% Notes, due January 15, 2048		45.0			45.0
4.64% Notes, due January 15, 2049		90.0			90.0
4.02% Notes, due January 15, 2058		30.0			30.0
Total principal of Spire Alabama long-term debt		750.0			575.0
Less: Unamortized discounts and debt issuance costs		(4.1	)		(3.5	)
Spire Alabama long-term debt, excluding current portion	$	745.9		$	571.5

Spire Missouri's $300.0 of first mortgage bonds due December 2, 2024 are secured equally with all its other first mortgage bonds. Interest is payable quarterly in arrears at a floating rate based on the compounded secured overnight financing rate plus 50 basis points, with a maximum rate of the lesser of 8% or the maximum rate then permitted by applicable law.

Maturities of long-term debt for Spire on a consolidated basis, Spire Missouri and Spire Alabama for the five fiscal years after September 30, 2023 are as follows:

	2024		2025		2026		2027		2028
Spire	$	156.6	$	342.0	$	312.5	$	108.1	$	53.6
Spire Missouri		—		300.0		—		—		45.0
Spire Alabama		—		35.0		—		—		—

The long-term debt agreements of Spire, Spire Missouri and Spire Alabama contain customary financial covenants and default provisions. As of September 30, 2023, there were no events of default under these financial covenants.

Spire

At September 30, 2023, Spire had outstanding principal of long-term debt totaling $3,732.7, of which $1,798.0 was issued by Spire Missouri, $750.0 was issued by Spire Alabama and $229.7 was issued by other subsidiaries. Except for $300.0 of Spire Missouri floating-rate bonds, all long-term debt bears fixed rates and is subject to changes in fair value as market interest rates change. However, increases and decreases in fair value would impact earnings and cash flows only if the Company were to reacquire any of these issues in the open market prior to maturity. Under GAAP applicable to the Utilities’ regulated operations, losses or gains on early redemption of long-term debt would typically be deferred as regulatory assets or regulatory liabilities and amortized over a future period. Interest expense shown on Spire’s consolidated statement of income is net of capitalized interest totaling $8.6, $4.5 and $4.4 for the years ended September 30, 2023, 2022 and 2021, respectively.

As indicated in Note 5, Shareholders’ Equity, Spire has a shelf registration statement on Form S-3 on file with the SEC for the issuance of equity and debt securities.

Spire Missouri

At September 30, 2023, Spire Missouri had outstanding principal of long-term debt totaling $1,798.0. Except for $300.0 of floating-rate bonds, all long-term debt bears fixed rates and is subject to changes in fair value as market interest rates change. Interest expense shown on Spire Missouri’s statement of comprehensive income is net of capitalized interest totaling $3.1, $0.6 and $0.2 for the years ended September 30, 2023, 2022 and 2021, respectively.

As indicated in Note 5, Shareholders’ Equity, Spire Missouri has a shelf registration on Form S-3 on file with the SEC for issuance of equity and debt securities, which expires on May 9, 2025. Effective March 5, 2022, Spire Missouri was authorized by the MoPSC to issue conventional term loans, first mortgage bonds, unsecured debt, preferred stock and common stock in an aggregate amount of up to $800.0 for financings placed any time before December 31, 2024. Under this authorization through September 30, 2023, Spire Missouri has issued $79.1 of common stock and $400.0 of first mortgage bonds.

Substantially all of Spire Missouri’s plant is subject to the liens of its first mortgage bonds. The mortgage contains several restrictions on Spire Missouri’s ability to pay cash dividends on its common stock, which are described in Note 5, Shareholders’ Equity.

Spire Alabama

At September 30, 2023, Spire Alabama had outstanding principal of fixed-rate long-term debt totaling $750.0. While these long-term debt issues are fixed-rate, they are subject to changes in fair value as market interest rates change. Interest expense shown on Spire Alabama’s statement of income is net of capitalized interest totaling $2.3, $3.2 and $3.2 for the years ended September 30, 2023, 2022 and 2021, respectively.

Spire Alabama has no standing authority to issue long-term debt and must petition the APSC for each planned issuance.

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Note 7 - Notes Payable and Credit Agreements

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Debt Disclosure [Text Block]

7. NOTES PAYABLE AND CREDIT AGREEMENTS

Spire, Spire Missouri and Spire Alabama have a syndicated revolving credit facility pursuant to a loan agreement with 12 banks through July 22, 2027. The loan agreement has an aggregate credit commitment of $1,300.0, including sublimits of $450.0 for the Spire holding company, $575.0 for Spire Missouri and $275.0 for Spire Alabama. These sublimits may be reallocated from time to time among the three borrowers within the $1,300.0 aggregate commitment, with commitment fees and interest margins applied for each borrower relative to its credit rating, as well as sustainability rate adjustments based on Spire's DART (“Days Away Restricted or Transferred”) rate and methane emissions reductions. The Spire holding company may use its line to provide for the funding needs of various subsidiaries. The agreement also contains financial covenants limiting each borrower’s consolidated total debt, including short-term debt, to no more than 70% of its total capitalization. As defined in the line of credit, on September 30, 2023, total debt was less than 65% of total capitalization for each borrower. There were no borrowings against this credit facility as of September 30, 2023 and 2022.

Spire has a commercial paper program (“CP Program”) pursuant to which it may issue short-term, unsecured commercial paper notes. Amounts available under the CP Program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount of the notes outstanding under the CP Program at any time not to exceed $1,300.0. The notes may have maturities of up to 365 days from date of issue.

On January 5, 2023, Spire Missouri entered into a loan agreement with several banks for a $250.0 unsecured term loan due October 5, 2023. Interest was based on the secured overnight financing rate (“SOFR”) plus an adjustment of 0.10% per annum plus a margin of 0.80% per annum. The loan was repaid on May 8, 2023.

Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of September 30, 2023, $706.9 of Spire’s short-term borrowings were used to support lending to the Utilities.

	Spire			Spire						Spire
	(Parent Only)			Missouri						Alabama			Spire
	CP			Term			Spire			Spire			Consol-
	Program			Loan			Note			Note			idated
Year Ended September 30, 2023
Highest borrowings outstanding	$	1,282.0		$	250.0		$	656.9		$	274.0		$	1,482.0
Lowest borrowings outstanding		354.4			—			3.8			76.7			489.0
Weighted average borrowings		776.3			66.8			327.9			119.1			843.1
Weighted average interest rate		5.0	%		5.5	%		4.9	%		4.9	%		5.0	%
As of September 30, 2023
Borrowings outstanding	$	955.5		$	—		$	540.6		$	124.1		$	955.5
Weighted average interest rate		5.6	%		0.0	%		5.6	%		5.6	%		5.6	%
As of September 30, 2022
Borrowings outstanding	$	1,037.5		$	—		$	445.3		$	260.9		$	1,037.5
Weighted average interest rate		3.3	%		0.0	%		3.3	%		3.3	%		3.3	%

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Note 8 - Fair Value of Financial Instruments

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Fair Value Disclosures [Text Block]

8. FAIR VALUE OF FINANCIAL INSTRUMENTS

The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis were as follows:

					Classification of
					Estimated Fair Value
					Quoted
					Prices in		Significant
					Active		Observable
	Carrying		Fair		Markets		Inputs
	Amount		Value		(Level 1)		(Level 2)
Spire
As of September 30, 2023
Cash and cash equivalents	$	5.6	$	5.6	$	5.6	$	—
Notes payable		955.5		955.5		—		955.5
Long-term debt, including current portion		3,710.6		3,270.2		—		3,270.2
As of September 30, 2022
Cash and cash equivalents	$	6.5	$	6.5	$	6.5	$	—
Notes payable		1,037.5		1,037.5		—		1,037.5
Long-term debt, including current portion		3,239.7		2,851.8		—		2,851.8
Spire Missouri
As of September 30, 2023
Cash and cash equivalents	$	0.8	$	0.8	$	0.8	$	—
Notes payable - associated companies		540.6		540.6		—		540.6
Long-term debt		1,785.4		1,592.4		—		1,592.4
As of September 30, 2022
Notes payable - associated companies	$	445.3	$	445.3	$	—	$	445.3
Long-term debt, including current portion		1,637.7		1,473.9		—		1,473.9
Spire Alabama
As of September 30, 2023
Cash and cash equivalents	$	1.2	$	1.2	$	1.2	$	—
Notes payable - associated companies		124.1		124.1		—		124.1
Long-term debt		745.9		648.0		—		648.0
As of September 30, 2022
Cash and cash equivalents	$	2.4	$	2.4	$	2.4	$	—
Notes payable - associated companies		260.9		260.9		—		260.9
Long-term debt		571.5		485.0		—		485.0

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Note 9 - Fair Value Measurements

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]

9. FAIR VALUE MEASUREMENTS

The information presented below categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition.

The mutual funds included in Level 1 are valued based on exchange-quoted market prices of individual securities. The mutual funds included in Level 2 are valued based on the closing net asset value per unit.

Derivative instruments included in Level 1 are valued using quoted market prices on the NYMEX or the Intercontinental Exchange (ICE). Derivative instruments classified in Level 2 include physical commodity derivatives and interest rate swaps that are valued using broker or dealer quotation services whose prices are derived principally from, or are corroborated by, observable market inputs. Also included in Level 2 are certain derivative instruments that have values that are similar to, and correlate with, quoted prices for exchange-traded instruments in active markets. Derivative instruments included in Level 3 are valued using generally unobservable inputs that are based upon the best information available and reflect management’s assumptions about how market participants would price the asset or liability. There were no Level 3 balances as of September 30, 2023 or 2022. The Company’s and the Utilities’ policy is to recognize transfers between the levels of the fair value hierarchy, if any, as of the beginning of the interim reporting period in which circumstances change or events occur to cause the transfer.

The mutual funds are included in “Other investments” on the Company’s balance sheets and in “Other Property and Investments” on Spire Missouri’s balance sheets. Changes in their recurring valuations are recorded as unrealized investment gains or losses in the corresponding periodic income statement. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net on the balance sheets when a legally enforceable netting agreement exist between the Company, Spire Missouri or Spire Alabama and the counterparty to the derivative contract. For additional information on derivative instruments, see Note 10, Derivative Instruments and Hedging Activities.

Spire

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		10.1		—		—		(10.1	)		—
Natural gas commodity contracts		—		36.7		—		(3.6	)		33.1
Other:
U.S. stock/bond mutual funds		37.6		—		—		—			37.6
Interest rate swaps		—		44.2		—		—			44.2
Total	$	74.4	$	81.0	$	—	$	(20.1	)	$	135.3
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
Gas Marketing:
NYMEX/ICE natural gas contracts		21.8		—		—		(21.8	)		—
Natural gas commodity contracts		—		27.6		—		(3.6	)		24.0
Total	$	72.6	$	27.6	$	—	$	(69.4	)	$	30.8
As of September 30, 2022
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		91.8		—		—		(91.8	)		—
Natural gas commodity contracts *		—		56.6		—		(4.0	)		52.6
Other:
U.S. stock/bond mutual funds		29.3		—		—		—			29.3
Interest rate swaps *		—		63.6		—		—			63.6
Total	$	198.0	$	120.2	$	—	$	(153.6	)	$	164.6
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—
Gas Marketing:
NYMEX/ICE natural gas contracts		82.3		—		—		(82.3	)		—
Natural gas commodity contracts *		—		65.5		—		(4.0	)		61.5
Total	$	113.0	$	65.5	$	—	$	(117.0	)	$	61.5

* Subsequent to the issuance of its consolidated financial statements for the year ended September 30, 2022, during the fourth quarter of fiscal 2023, the Company identified an error in the fair value level presentation for certain line items in the Fair Value Measurements table. The presentation has been corrected to reflect the impacted line items in Level 2 rather than Level 1 as of September 30, 2022. This immaterial correction did not impact the reported fair values or the consolidated financial statements.

Spire Missouri

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Total	$	26.7	$	0.1	$	—	$	(6.4	)	$	20.4
LIABILITIES
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
As of September 30, 2022
ASSETS
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Total	$	76.9	$	—	$	—	$	(57.8	)	$	19.1
LIABILITIES
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—

Spire Alabama

Spire Alabama occasionally utilizes a gasoline derivative program to stabilize the cost of fuel used in operations. As of September 30, 2023 and September 30, 2022, there were no gasoline derivatives outstanding.

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Note 10 - Derivative Instruments and Hedging Activities

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Derivative Instruments and Hedging Activities Disclosure [Text Block]

10. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Spire

Spire Missouri has a risk management policy to utilize various derivatives, including futures contracts, exchange-traded options and swaps for the explicit purpose of managing price risk associated with purchasing and delivering natural gas on a regular basis to customers in accordance with its tariffs. The objective of this policy is to limit Spire Missouri’s exposure to natural gas price volatility and to manage, hedge and mitigate substantial price risk. Further discussion of this policy can be found in the Spire Missouri section.

From time to time Spire Missouri and Spire Alabama purchase NYMEX futures and options contracts to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment. Further information on these derivatives can be found in the Spire Missouri and Spire Alabama sections, respectively.

In the course of its business, Spire’s gas marketing subsidiary, Spire Marketing enters into commitments associated with the purchase or sale of natural gas. Certain of Spire Marketing’s derivative natural gas contracts are designated as normal purchases or normal sales and, as such, are excluded from the scope of ASC Topic 815 and are accounted for as executory contracts on an accrual basis. Any of Spire Marketing’s derivative natural gas contracts that are not designated as normal purchases or normal sales are accounted for at fair value. At September 30, 2023, the fair values of 567.0 million MMBtu of non-exchange-traded natural gas commodity contracts were reflected in the Consolidated Balance Sheet. Of these contracts, 379.1 million MMBtu will settle during fiscal 2024, and 151.1 million MMBtu, 26.4 million MMBtu, and 3.8 million MMBtu, will settle during fiscal years 2025, 2026, and 2027, respectively. A total of 6.6 million MMBtu will settle in the years 2028-2030. These contracts have not been designated as hedges; therefore, changes in the fair value of these contracts are reported in earnings each period.

Furthermore, Spire Marketing manages the price risk associated with its fixed-priced commitments by either closely matching the offsetting physical purchase or sale of natural gas at fixed prices or through the use of NYMEX or ICE futures, swap, and option contracts to lock in margins.

At September 30, 2023, Spire Marketing’s unmatched fixed-price positions were not material to Spire’s financial position or results of operations. Spire Marketing’s NYMEX and ICE natural gas futures, swap and option contracts used to lock in margins may be designated as cash flow hedges of forecasted transactions for financial reporting purposes.

Spire enters into cash flow hedges through the execution of interest rate swap contracts to protect itself against adverse movements in interest rates. At September 30, 2023, the following swaps were outstanding:

Period Originated	Contract Hedge Term (Years)		Notional Amount		Fixed Interest Rate			Fiscal 2023 Mark-to-Market Gain
Quarter 1, fiscal 2022		10	$	50.0		1.4918	%	$	2.7
Quarter 2, fiscal 2022		10		75.0		1.6475	%		4.0
Quarter 2, fiscal 2022		10		25.0		1.7460	%		1.5
Quarter 1, fiscal 2023		10		50.0		3.4480	%		2.4
Quarter 2, fiscal 2023		10		50.0		3.6850	%		0.9
Quarter 2, fiscal 2023		10		25.0		3.5350	%		0.5
Quarter 2, fiscal 2023		10		25.0		3.3850	%		0.6
Quarter 3, fiscal 2023		30		50.0		2.7470	%		7.8
Quarter 3, fiscal 2023		10		25.0		2.9020	%		2.2
Quarter 3, fiscal 2023		10		25.0		3.0180	%		2.0
			$	400.0				$	24.6

As of  September 30, 2023, the Company has recorded through other comprehensive income a cumulative mark-to-market net asset of $44.2 on open swaps.

The Company’s and Spire Missouri’s exchange-traded/cleared derivative instruments consist primarily of NYMEX and ICE positions. The NYMEX is the primary national commodities exchange on which natural gas derivatives are traded. Open NYMEX and ICE natural gas futures and swap positions at September 30, 2023 and 2022 were as follows:

	September 30, 2023		September 30, 2022
Gas Marketing	Notional (MMBtu millions)	Maximum Term (Months)	Notional (MMBtu millions)	Maximum Term (Months)
Natural gas futures purchased	61.3	51	76.3	54
Natural gas options purchased, net	4.9	15	3.7	12
Natural gas basis swaps purchased	44.1	51	61.7	39
Gas Utility
Natural gas futures purchased	66.5	24	13.0	12

At September 30, 2023, Spire Missouri also had 16.3 million MMBtu of other price mitigation in place through the use of NYMEX natural gas option-based strategies.

Derivative instruments designated as cash flow hedges of forecasted transactions are recognized on the balance sheets of the Company at fair value, and the change in fair value of the effective portion of these hedge instruments is recorded, net of income tax, in other comprehensive income or loss (OCI). Accumulated other comprehensive income or loss (AOCI) is a component of Total Common Stock Equity. Amounts are reclassified from AOCI into earnings when the hedged items affect net income, using the same revenue or expense category that the hedged item impacts. Based on market prices at September 30, 2023, it is expected that $2.8 of net gains will be reclassified into the Consolidated Statements of Income of the Company during the next twelve months. Cash flows from hedging transactions are classified in the same category as the cash flows from the items that are being hedged in the Consolidated Statements of Cash Flows.

Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income
	Location of Gain (Loss)
	Recorded in Income	2023			2022			2021
Derivatives in Cash Flow Hedging Relationships
Effective portion of gain recognized in OCI on derivatives:
Interest rate swaps		$	20.1		$	56.7		$	61.2
Effective portion of gain reclassified from AOCI to income:
Interest rate swaps	Interest Expense	$	(2.4	)	$	(1.2	)	$	(1.3	)
Derivatives Not Designated as Hedging Instruments*
Gain (Loss) recognized in income on derivatives:
Gas / diesel futures	Non-Operating Expense: Other Income	$	0.3		$	—		$	—
Natural gas commodity contracts	Operating Expenses: Natural Gas		18.0			52.6			54.1
NYMEX / ICE natural gas contracts	Operating Expenses: Natural Gas		(35.0	)		43.3			(77.5	)
Total		$	(16.7	)	$	95.9		$	(23.4	)

* Gains and losses on Spire Missouri’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Missouri Utilities’ PGA clauses and initially recorded as regulatory assets or regulatory liabilities. These gains and losses are excluded from the table above because they have no direct impact on the statements of income. Such amounts are recognized in the statements of income as a component of natural gas operating expenses when they are recovered through the PGA clause and reflected in customer billings.

Fair Value of Derivative Instruments in the Consolidated Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	44.2	Current Liabilities: Other	$	—
Subtotal			44.2			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		6.3	Current Liabilities: Other		50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1			—
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other		8.0	Current Liabilities: Other		16.0
	Deferred Charges and Other Assets: Other		2.1	Deferred Credits and Other Liabilities: Other		5.7
Natural gas commodity	Current Assets: Other		31.2	Current Liabilities: Other		20.1
	Deferred Charges and Other Assets: Other		5.5	Deferred Credits and Other Liabilities: Other		7.6
Subtotal			53.2			100.2
Total derivatives		$	97.4		$	100.2
September 30, 2022
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	63.6	Current Liabilities: Other	$	—
Subtotal			63.6			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		57.8	Current Liabilities: Other		30.7
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other	79.2		Current Liabilities: Other		71.5
	Deferred Charges and Other Assets: Other		12.7	Deferred Credits and Other Liabilities: Other		10.8
Natural gas commodity	Current Assets: Other		53.4	Current Liabilities: Other		55.1
	Deferred Charges and Other Assets: Other		3.1	Deferred Credits and Other Liabilities: Other		10.4
Subtotal			206.2			178.5
Total derivatives		$	269.8		$	178.5

* The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

Following is a reconciliation of the amounts in the tables above to the amounts presented in the consolidated balance sheets:

	2023			2022
Fair value of derivative assets presented above	$	97.4		$	269.8
Fair value of cash margin receivable offset with derivatives		49.3			(36.6	)
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	77.3		$	116.2
Derivative Instrument Assets, per Consolidated Balance Sheets:
Current Assets: Other	$	71.8		$	113.1
Deferred Charges and Other Assets: Other		5.5			3.1
Total	$	77.3		$	116.2
Fair value of derivative liabilities presented above	$	100.2		$	178.5
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	30.8		$	61.5
Derivative Instrument Liabilities, per Consolidated Balance Sheets:
Current Liabilities: Other	$	23.2		$	51.1
Deferred Credits and Other Liabilities: Other		7.6			10.4
Total	$	30.8		$	61.5

Additionally, at September 30, 2023 2022, the Company had zero and $49.8, respectively, in cash margin receivables not offset with derivatives, which are presented in Accounts Receivable – Other.

Spire Missouri

Spire Missouri has a risk management policy to utilize various derivatives, including futures contracts, exchange-traded options, swaps and over-the-counter instruments for the explicit purpose of managing price risk associated with purchasing and delivering natural gas on a regular basis to customers in accordance with its tariffs. The objective of this policy is to limit Spire Missouri’s exposure to natural gas price volatility and to manage, hedge and mitigate substantial price risk. This policy strictly prohibits speculation and permits Spire Missouri to hedge current physical natural gas purchase commitments or forecasted or anticipated future peak (maximum) physical need for natural gas delivered. Costs and cost reductions, including carrying costs, associated with Spire Missouri’s use of natural gas derivative instruments are allowed to be passed on to Spire Missouri customers through the operation of its PGA clause, through which the MoPSC allows Spire Missouri to recover gas supply costs, subject to prudence review by the MoPSC. Accordingly, Spire Missouri does not expect any adverse earnings impact as a result of the use of these derivative instruments.

Spire Missouri does not designate these instruments as hedging instruments for financial reporting purposes because gains or losses associated with the use of these derivative instruments are deferred and recorded as regulatory assets or regulatory liabilities pursuant to ASC Topic 980, Regulated Operations, and, as a result, have no direct impact on the statements of income.

The timing of the operation of the PGA clause may cause interim variations in short-term cash flows, because Spire Missouri is subject to cash margin requirements associated with changes in the values of these instruments. Nevertheless, carrying costs associated with such requirements are recovered through the PGA clause.

From time to time, Spire Missouri purchases NYMEX futures and options contracts to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment used in the course of its business. The gains and losses on these contracts are not subject to Spire Missouri’s PGA clause. At September 30, 2023, Spire Missouri did not have a material amount of gasoline futures contracts outstanding.

Derivative instruments designated as cash flow hedges of forecasted transactions are recognized on the balance sheets at fair value and the change in the fair value of the effective portion of these hedge instruments is recorded, net of income tax, in OCI. AOCI is a component of Total Common Stock Equity. Amounts are reclassified from AOCI into earnings when the hedged items affect net income, using the same revenue or expense category that the hedged item impacts. As in both 2022 and 2021, there will be no reclassifications into the statements of income during fiscal 2024. Cash flows from hedging transactions are classified in the same category as the cash flows from the items that are being hedged in the statements of cash flows.

Spire Missouri’s derivative instruments consist primarily of NYMEX positions. The NYMEX is the primary national commodities exchange on which natural gas derivatives are traded. Open NYMEX natural gas futures positions at September 30, 2023 and 2022 were as follows:

	September 30, 2023				September 30, 2022
	Notional (MMBtu millions)		Maximum Term (Months)		Notional (MMBtu millions)		Maximum Term (Months)
Natural gas futures purchased		66.5		24		13.0		12

At September 30, 2023, Spire Missouri had also had 16.3 million MMBtu of other price mitigation in place through the use of NYMEX natural gas option-based strategies.

Gains and losses on Spire Missouri’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Spire Missouri’s PGA clauses and initially recorded as regulatory assets or regulatory liabilities. Such amounts are recognized in the statements of income as a component of natural gas operating expenses when they are recovered through the PGA clause and reflected in customer billings.

Fair Value of Derivative Instruments in the Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	6.3	Current Liabilities: Other	$	50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1
Total derivatives		$	6.4		$	50.8
September 30, 2022
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	57.8	Current Liabilities: Other	$	30.7

* The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of Spire Missouri’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

Following is a reconciliation of the amounts in the tables above to the amounts presented in Spire Missouri’s balance sheets:

	2023			2022
Fair value of derivative assets presented above	$	6.4		$	57.8
Fair value of cash margin (payable) receivable offset with derivatives		37.6			(27.1	)
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	—		$	—
Fair value of derivative liabilities presented above	$	50.8		$	30.7
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	6.8		$	—
Derivative Instrument Liabilities, per Balance Sheets:
Derivative instrument liabilities	$	6.8		$	—
Total	$	6.8		$	—

Additionally, at September 30, 2023 and 2022, Spire Missouri had zero and $24.0, respectively, in cash margin receivables not offset with derivatives, which are presented in Accounts Receivable – Other.

Spire Alabama

Spire Alabama periodically employs a gasoline derivative program to help stabilize operating costs associated with forecasted purchases of gasoline and diesel fuels used to power vehicles and equipment used in the course of its business. The gains or losses on these derivative instruments are not subject to Spire Alabama’s GSA rider. There were no such contracts outstanding as of September 30, 2023 and 2022.

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Note 11 - Concentrations of Credit Risk

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

11. CONCENTRATIONS OF CREDIT RISK

Spire’s Gas Utility segment serves 1.7 million customers in three states across multiple rate classes resulting in a significant amount of revenue diversity. Credit risk is mitigated by the high percentage of residential customers as well as the geographic diversity of the Utilities, though customers for each of the Utilities are concentrated in a single state.

Spire Marketing’s accounts receivable attributable to utility companies and their marketing affiliates totaled $53.4 at September 30, 2023. The concentration of transactions with these counterparties has the potential to affect the Company’s overall exposure to credit risk, either positively or negatively, in that customers in this group may be affected similarly by changes in economic, industry, or other conditions. Spire Marketing also has concentrations of credit risk with certain individually significant counterparties. At September 30, 2023, the amounts included in accounts receivable from its five largest counterparties (in terms of net accounts receivable exposure) totaled $26.7. Three of these five counterparties are investment-grade-rated integrated utilities, one is a liquefied natural gas project facility with a senior debt issue rating one notch below investment-grade with a positive outlook, and one is a utility marketing affiliate which is not rated but whose owners are all investment-grade public power companies.

To manage these risks, Spire Marketing has established procedures to determine the creditworthiness of its counterparties. These procedures include obtaining credit ratings and credit reports, analyzing counterparty financial statements to assess financial condition, and considering the industry environment in which the counterparty operates. This information is monitored on an ongoing basis. In some instances, Spire Marketing may require credit assurances such as prepayments, letters of credit, or parental guaranties. In addition, Spire Marketing may enter into netting arrangements to mitigate credit risk with counterparties in the energy industry with whom it conducts both sales and purchases of natural gas. Where there is no netting arrangement, Spire Marketing records accounts receivable, accounts payable, and prepayments for physical sales and purchases of natural gas on a gross basis. Sales are typically made on an unsecured credit basis with payment due the month following delivery. Accounts receivable amounts are closely monitored and provisions for uncollectible amounts are accrued when losses are probable.

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Note 12 - Income Taxes

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Income Tax Disclosure [Text Block]

12. INCOME TAXES

The Company, Spire Missouri, and Spire Alabama are subject to federal income tax as well as income tax in various state and local jurisdictions. Spire files a consolidated federal income tax return and various state income tax returns and allocates income taxes to Spire Missouri, Spire Alabama and its other subsidiaries as if each entity were a separate taxpayer.

The provision for income taxes during the fiscal years ended September 30, 2023, 2022, and 2021 was as follows:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023		2022		2021
Federal:
Current	$	0.7		$	0.5		$	0.2		$	—		$	—		$	—		$	—	$	—	$	—
Deferred		30.4			47.0			49.5			10.1			18.2			22.0			15.8		18.1		19.8
Investment tax credits		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		—		—		—
State and local:
Current		1.2			0.5			1.3			—			—			—			—		—		—
Deferred		6.7			11.1			17.7			1.7			3.3			3.5			4.5		5.1		5.2
Total income tax expense	$	38.8		$	58.9		$	68.5		$	11.6		$	21.3		$	25.3		$	20.3	$	23.2	$	25.0

The effective income tax rate varied from the federal statutory income tax rate for each year due to the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Federal income tax statutory rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
State and local income taxes, net of federal income tax benefits		3.7			3.6			3.6			2.6			2.6			2.6			4.1			4.1			4.1
Certain expenses capitalized on books and deducted on tax return		(1.4	)		(1.6	)		(1.6	)		(2.7	)		(3.2	)		(3.3	)		—			—			—
Taxes related to prior years		—			(0.3	)		(0.5	)					(0.6	)		(0.2	)		—			—			—
Tax credits *		(3.3	)		—			—			(4.2	)		—			—			(1.9	)		—			—
Amortization of excess deferred taxes		(5.1	)		(3.5	)		(2.5	)		(7.7	)		(7.3	)		(5.0	)		0.2			—			—
Other items – net **		0.2			1.9			0.1			—			3.1			(0.2	)		0.1			0.2			0.2
Effective income tax rate		15.1	%		21.1	%		20.1	%		9.0	%		15.6	%		14.9	%		23.5	%		25.3	%		25.3	%

*	In 2023, the Company completed a research and development study which encompassed fiscal years 2014 to 2022.
**	Other consists primarily of property adjustments.

The significant items comprising the net deferred tax liability or asset as of September 30 were as follows:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Deferred tax assets:
Reserves not currently deductible	$	27.7		$	33.5		$	—		$	4.0		$	3.9		$	7.4
Pension and other postretirement benefits		64.4			72.6			44.7			52.6			17.0			—
Goodwill		—			—			—			—			58.8			73.0
Operating losses		239.2			255.1			89.2			116.9			159.8			140.3
Regulatory amount due to customers, net		30.4			34.5			27.6			30.7			—			—
Other		35.8			24.9			10.5			—			3.0			—
Total deferred tax assets		397.5			420.6			172.0			204.2			242.5			220.7
Deferred tax liabilities:
Relating to property		(788.0	)		(740.0	)		(507.7	)		(489.3	)		(218.7	)		(201.6	)
Regulatory pension and other postretirement benefits		(80.6	)		(92.8	)		(53.0	)		(72.3	)		(25.9	)		(1.6	)
Deferred gas costs		(67.0	)		(75.8	)		(64.1	)		(74.0	)		—			—
Other ***		(205.6	)		(187.1	)		(79.0	)		(68.7	)		(7.0	)		(6.5	)
Total deferred tax liabilities		(1,141.2	)		(1,095.7	)		(703.8	)		(704.3	)		(251.6	)		(209.7	)
Net deferred tax (liability) asset	$	(743.7	)	$	(675.1	)	$	(531.8	)	$	(500.1	)	$	(9.1	)	$	11.0

*** For Spire, Other consists primarily of goodwill-related liabilities.

As indicated in Note 1, Summary of Significant Accounting Policies, the Company’s regulated operations accounting for income taxes is impacted by ASC Topic 980, Regulated Operations. The Tax Cuts and Jobs Act of 2017 (TCJA) reduced the corporate federal income tax rate, and the corresponding reductions in deferred income tax balances resulted in amounts previously collected from utility customers for these deferred taxes becoming refundable to such customers, generally through reductions in future rates. The TCJA includes provisions that stipulate how these excess deferred taxes are to be passed back to customers for certain accelerated tax depreciation benefits. In fiscal 2018, the MoPSC Amended Report and Order took effect and the estimated excess accumulated deferred income tax began to be returned to Spire Missouri customers in rates. During the prior fiscal year, the amount of excess accumulated deferred income taxes was trued up as part of the rate proceeding. The amount being returned related to the TCJA has been updated and in addition the excess accumulated deferred income taxes related to the Missouri tax rate change began to be returned in fiscal 2022. For Spire Missouri, excess accumulated deferred taxes of $10.0, $9.9, and $8.4, respectively, were returned in fiscal year 2023, 2022, and 2021. The treatment for accumulated deferred income tax balances for Spire Alabama, Spire Gulf and Spire Mississippi started to be accounted for during fiscal 2023. For Spire Gulf, $3.1 was returned to ratepayers. Spire Mississippi returned less than $0.1. For Spire Alabama, the deferred tax position resulted in a collection from customers of $0.2 for fiscal 2023.

On April 14, 2023, the IRS issued Revenue Procedure 2023-15 that provides a safe harbor method of accounting that taxpayers may use to determine whether to deduct or capitalize expenditures to repair, maintain, replace, or improve natural gas transmission and distribution property. Under the revenue procedure, the method of accounting will depend on the property’s classification as linear transmission property, linear distribution property, or non-linear property. The revenue procedure may be adopted in tax years ending after May 1, 2023. The Company is evaluating the revenue procedure and the impact adopting the safe harbor would have on its property that is subject to this guidance.

In assessing whether deferred tax assets are realizable, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Management considers all significant available positive and negative evidence, including the existence of losses in recent years, the timing of deferred tax liability reversals, projected future taxable income, taxable income in carryback years, and tax planning strategies to assess the need for a valuation allowance. Based upon this evidence, management believes it is more likely than not the Company, Spire Missouri and Spire Alabama will realize the benefits of these deferred tax assets.

As of September 30, 2023, Spire, and on a separate company basis, Spire Missouri and Spire Alabama, had federal and state loss carryforwards, contribution carryforwards, and various tax credit carryforwards as shown below.

	Spire		Spire Missouri		Spire Alabama
Federal and state loss carryforwards	$	1,000.3	$	352.4	$	624.1
Contribution carryforwards		6.1		5.6		-
Tax credit carryforwards		13.1		8.5		1.6

For federal tax purposes, Spire Missouri’s and Spire Alabama’s loss carryforwards may be utilized against income from another member of the consolidated group. The loss carryforwards begin to expire in fiscal 2030 for certain state purposes and fiscal 2035 for federal and other state purposes. Contribution carryforwards and tax credit carryforwards are expected to be utilized prior to their expiration.

The Company, Spire Missouri and Spire Alabama recognize the tax benefit from a tax position only if it is at least more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. Unrecognized tax benefits are reported as a reduction of a deferred tax asset for an operating loss carryforward to the extent the recognition of the benefit would impact the operating loss carryforward, pursuant to ASU 2013-11. The following table presents a reconciliation of the beginning and ending balances of unrecognized tax benefits:

	Spire							Spire Missouri						Spire Alabama
	2023		2022			2021		2023		2022		2021		2023		2022		2021
Unrecognized tax benefits, beginning of year	$	19.6	$	16.4		$	13.2	$	19.3	$	16.1	$	13.0	$	—	$	—	$	—
Increases related to tax positions taken in current year		4.2		3.3			3.2		3.6		3.2		3.1		0.3		—		—
Reductions due to lapse of applicable statute of limitations		—		(0.1	)		—		—		—		—		—		—		—
Unrecognized tax benefits, end of year	$	23.8	$	19.6		$	16.4	$	22.9	$	19.3	$	16.1	$	0.3	$	—	$	—

As of September 30, 2023 and 2022, the amounts of unrecognized tax benefits which, if recognized, would affect the effective tax rate were $5.9 and $4.0, respectively, for the Company, $5.1 and $3.7, respectively, for Spire Missouri, and $0.3 and $0.0, respectively, for Spire Alabama. It is reasonably possible that events will occur in the next 12 months that could increase or decrease the amount of the unrecognized tax benefits. The Company, Spire Missouri, and Spire Alabama do not expect that any such change will be significant to the balance sheets. Spire Alabama reported no unrecognized tax benefits for fiscal years 2022 and 2021.

The Company, Spire Missouri, and Spire Alabama record potential interest and penalties related to uncertain tax positions as interest expense and other income deductions, respectively. As of September 30, 2023 and 2022, interest accrued associated with uncertain tax positions was de minimis, and no penalties were accrued.

The Company, Spire Missouri, and Spire Alabama are no longer subject to examination for fiscal years prior to 2020, except to the extent the net operating losses from prior years are reviewed.

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Note 13 - Pension Plans and Other Postretirement Benefits

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Retirement Benefits [Text Block]

13. PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS

Pension Plans

Spire and the Utilities maintain pension plans for their employees. Spire Missouri and Spire Alabama have non-contributory, defined benefit, trusteed forms of pension plans covering the majority of their employees. Qualified plan assets are comprised of mutual and commingled funds consisting of U.S. equities with varying strategies, global equities, alternative investments, and fixed income investments.

The net periodic pension cost includes components shown in the following table. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.”

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	16.3		$	20.0		$	21.7		$	11.4		$	14.4		$	15.4		$	4.2		$	4.8		$	5.5
Interest cost on projected benefit obligation		25.1			21.5			20.7			17.8			14.7			14.2			4.8			4.7			4.6
Expected return on plan assets		(24.5	)		(31.3	)		(31.6	)		(18.0	)		(22.7	)		(22.5	)		(3.5	)		(5.2	)		(5.8	)
Amortization of prior service credit		(4.5	)		(4.5	)		(3.1	)		(1.9	)		(1.9	)		(0.6	)		(2.4	)		(2.4	)		(2.3	)
Amortization of actuarial loss		6.6			11.9			14.9			6.1			9.6			11.0			0.9			2.4			3.9
Loss on lump-sum settlements and curtailments		9.7			33.6			18.2			0.6			27.3			11.6			9.1			6.3			6.6
Subtotal		28.7			51.2			40.8			16.0			41.4			29.1			13.1			10.6			12.5
Regulatory adjustment		26.3			12.5			20.6			27.1			9.9			19.0			(1.7	)		1.7			0.7
Net pension cost	$	55.0		$	63.7		$	61.4		$	43.1		$	51.3		$	48.1		$	11.4		$	12.3		$	13.2

Other changes in plan assets and pension benefit obligations recognized in other comprehensive income or loss include the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial loss (gain)	$	14.5		$	(16.9	)	$	(8.1	)	$	5.7		$	0.9		$	(0.9	)	$	9.0		$	(16.0	)	$	(1.5	)
Amortization of actuarial loss		(6.6	)		(11.9	)		(14.9	)		(6.1	)		(9.6	)		(11.0	)		(0.9	)		(2.4	)		(3.9	)
Acceleration of loss recognized due to settlement		(9.7	)		(33.6	)		(18.2	)		(0.6	)		(27.3	)		(11.6	)		(9.1	)		(6.3	)		(6.6	)
Current year service credit		—			—			(17.9	)		—			—			(17.9	)		—			—			—
Amortization of prior service credit		4.5			4.5			3.1			1.9			1.9			0.6			2.4			2.4			2.3
Subtotal		2.7			(57.9	)		(56.0	)		0.9			(34.1	)		(40.8	)		1.4			(22.3	)		(9.7	)
Regulatory adjustment		(2.8	)		56.3			57.3			(1.0	)		32.5			42.1			(1.4	)		22.3			9.7
Total recognized in OCI	$	(0.1	)	$	(1.6	)	$	1.3		$	(0.1	)	$	(1.6	)	$	1.3		$	—		$	—		$	—

Spire pension obligations are driven by separate plan and regulatory provisions governing Spire Missouri, Spire Alabama and Spire EnergySouth pension plans.

Pursuant to the provisions of Spire Missouri’s and Spire Alabama’s pension plans, pension obligations may be satisfied by monthly annuities, lump-sum cash payments, or special termination benefits. Lump-sum payments are recognized as settlements (which can result in gains or losses) only if the total of such payments exceeds the sum of service and interest costs in a specific year. Special termination benefits, when offered, are also recognized as settlements which can result in gains or losses.

In the fiscal year ended September 30, 2023, one Spire Missouri plan and two Spire Alabama plans met the criteria for settlement recognition, requiring re-measurement of the obligation under those plans using updated census data and assumptions for discount rate and mortality. For the remeasurements, the discount rate for the Missouri plan was updated to 6.3% at September 30, 2023 (from 5.8% at September 30, 2022), and the discount rate for the Alabama plans were updated to 6.2% and 6.25%, respectively, (from 5.7% and 5.65%, respectively). Lump-sum payments recognized as settlements during fiscal 2023 was $48.7 ($9.9 attributable to Spire Missouri and $38.8 to Spire Alabama). The Alabama regulatory tariff requires that settlement losses be amortized over the remaining actuarial life of the individuals in the plan, and in fiscal 2023 the amortization periods range from 11.8 years to 13.4 years. Therefore, no lump sum settlement expenses were recorded in the fiscal year ended September 30, 2023.

In the fiscal year ended September 30, 2022, two Spire Missouri plans and two Spire Alabama plans met the criteria for settlement recognition, requiring re-measurement of the obligation under those plans using updated census data and assumptions for discount rate and mortality. For the remeasurements, the discount rates for the Missouri plans were updated to 5.7% and 5.8%, respectively, for each plan at September 30, 2022 (from 3.0%, at September 30, 2021), and the discount rate for the Alabama plans were updated to 5.7% and 5.65%, respectively, (from 3.1% and 3.0%, respectively). Lump-sum payments recognized as settlements during fiscal 2022 was $109.3 ($87.0 attributable to Spire Missouri and $22.3 to Spire Alabama). The Alabama regulatory tariff requires that settlement losses be amortized over the remaining actuarial life of the individuals in the plan, and in fiscal 2022 the amortization periods range from 11.4 years to 12.3 years. Therefore, no lump sum settlement expenses were recorded in the fiscal year ended September 30, 2022.

Effective December 23, 2021, the pension cost for Spire Missouri’s western territory (Missouri West) included in customer rates was reduced from $5.5 to $4.4 per year, the pension cost included in Spire Missouri’s eastern territory (Missouri East) customer rates was increased from $29.0 to $32.4 per year. Subsequently, on December 26, 2022, the amount in Missouri East was lowered to $29.9. The difference between these amounts and pension expense as calculated pursuant to the above and that otherwise would be included in the statements of income and statements of comprehensive income is deferred as a regulatory asset or regulatory liability.

Also effective December 23, 2021, Missouri East prepaid pension assets and other postretirement benefits that were previously being included in rates at $21.6 per year for eight years were reduced to $11.0 per year, with the amortization period being reset for another eight years. Missouri West net liability for pension and other postretirement benefits that were previously reducing rates by $3.3 per year for eight years were reduced to a $1.1 reduction in rates per year, with the amortization period being reset for another eight years. Subsequently, on December 26, 2022, Missouri East amortization was lowered to $6.9 and Missouri West to a reduction of $0.8.

The following table shows the reconciliation of the beginning and ending balances of the pension benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	464.4		$	689.6		$	320.6		$	479.0		$	97.8		$	149.4
Service cost		16.3			20.0			11.4			14.4			4.2			4.8
Interest cost		25.1			21.5			17.8			14.7			4.8			4.7
Actuarial (gain) loss		(1.1	)		(173.9	)		(4.9	)		(116.2	)		5.4			(42.4	)
Settlement loss		9.7			33.4			0.6			27.9			9.1			5.6
Settlement benefits paid		(48.8	)		(109.3	)		(9.9	)		(87.0	)		(38.8	)		(22.3	)
Regular benefits paid		(26.9	)		(16.9	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Benefit obligation, end of year	$	438.7		$	464.4		$	313.2		$	320.6		$	80.6		$	97.8
Accumulated benefit obligation, end of year	$	433.1		$	457.1		$	309.5		$	315.0		$	78.8		$	96.2

In 2023, qualified plans except Spire Alabama's experienced actuarial gains. These gains were driven by the discount rates increasing by between 50 and 55 basis points, and were only partly offset by actuarial asset losses, as the trusts experienced actual returns below the actuarial expected returns. However, Spire Alabama had actuarial losses relating to larger than projected settlements, which, when combined with the actuarial asset losses, more than offset the gains relating to the increase in the discount rate.

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets, beginning of year	$	332.7		$	498.9		$	235.9		$	364.0		$	57.3		$	82.8
Actual return on plan assets		9.1			(92.5	)		7.5			(66.7	)		—			(15.6	)
Employer contributions		58.9			52.4			30.3			37.8			27.9			14.4
Settlement benefits paid		(39.1	)		(109.3	)		(9.3	)		(87.0	)		(29.7	)		(22.3	)
Regular benefits paid		(26.9	)		(16.8	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Fair value of plan assets, end of year	$	334.7		$	332.7		$	242.0		$	235.9		$	53.6		$	57.3
Funded status of plans, end of year	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Current liabilities	$	(1.6	)	$	(1.1	)	$	(1.6	)	$	(1.1	)	$	—		$	—
Noncurrent liabilities		(102.4	)		(130.6	)		(69.6	)		(83.6	)		(27.0	)		(40.5	)
Total	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic pension cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial loss	$	130.1		$	132.0		$	92.5		$	93.6		$	40.2		$	41.2
Prior service credit		(31.2	)		(35.7	)		(16.2	)		(18.1	)		(13.9	)		(16.3	)
Subtotal		98.9			96.3			76.3			75.5			26.3			24.9
Adjustments for amounts included in regulatory assets		(95.9	)		(93.1	)		(73.3	)		(72.3	)		(26.3	)		(24.9	)
Total	$	3.0		$	3.2		$	3.0		$	3.2		$	—		$	—

The assumptions used to calculate net periodic pension costs for Spire Missouri are as follows:

	2023		2022		2021
Weighted average discount rate - Spire Missouri East plan		5.70%		3.00%		2.85%
Weighted average discount rate - Spire Missouri West plan		5.80%		3.00%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

The assumptions used to calculate net periodic pension costs for Spire Alabama are as follows:

	2023		2022		2021
Weighted average discount rate	5.65%/5.7%		3.10%/3.0%		2.95%/2.80%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

The discount rate is based on long-term, high quality bond indices at the measurement date. The expected long-term rate of return on plan assets is based on historical and projected rates of return for current and planned asset classes in the investment portfolio. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns. The overall expected rate of return for the portfolio was developed based on the target allocation for each class.

The assumptions used to calculate the benefit obligations are as follows:

	2023		2022
Weighted average discount rate - Spire Missouri East plan		6.25%		5.70%
Weighted average discount rate - Spire Missouri West plan		6.30%		5.80%
Weighted average discount rate - Spire Alabama plans	6.2%/6.25%		5.70%/5.65%
Weighted average rate of future compensation increase		3.00%		3.00%
Cash balance interest crediting rate - Spire Alabama / Spire Missouri		4.25%		4.25%

The following table sets forth the year-end projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for plans that have a projected benefit obligation and an accumulated benefit obligation in excess of plan assets:

	Spire				Spire Missouri				Spire Alabama
	2023		2022		2023		2022		2023		2022
Projected benefit obligation	$	438.7	$	464.4	$	313.2	$	320.6	$	80.6	$	97.8
Accumulated benefit obligation		433.1		457.1		309.5		315.0		78.8		96.2
Fair value of plan assets		334.7		332.7		242.0		235.9		53.6		57.3

The following tables set forth the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		70.0	%		77.0	%		70.0	%		74.3	%
Liability hedging assets		30.0	%		20.0	%		30.0	%		22.8	%
Cash and cash equivalents		—	%		3.0	%		—	%		2.9	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Spire Alabama	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		75.0	%		76.0	%		70.0	%		68.7	%
Liability hedging assets		25.0	%		15.0	%		30.0	%		25.3	%
Cash and cash equivalents		—	%		9.0	%		—	%		6.0	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

The Spire Inc. Retirement Plans Committee is responsible for the administration of the various plans, and all payments under the plans require direction of that committee. The Spire Inc. Defined Benefit Plan Investment Review Committee utilizes an Outsourced Chief Investment Officer (OCIO) model where investment decisions are outsourced to investment consultants (Willis Towers Watson), who in turn become co-fiduciaries with the committee.

For all plans, the Company employs a total return investment approach whereby a mix of equities and fixed income investments are used to maximize the long-term return of plan assets with a prudent level of risk. Risk tolerance is established through consideration of plan liabilities, plan funded status, corporate financial condition and market conditions. The Company has developed an investment strategy that focuses on asset allocation, diversification and quality guidelines. The investment goals are to obtain an adequate level of return to meet future obligations of the plan by providing above average risk-adjusted returns with a risk exposure in the mid-range of comparable funds. Comparative market and peer group benchmarks are utilized to ensure that investment managers are performing satisfactorily. The Company seeks to maintain an appropriate level of diversification to minimize the risk of large losses in a single asset class. Accordingly, plan assets for the pension plans do not have a concentration of assets in a single entity, industry, country, commodity or class of investment fund.

The following table sets forth expected pension benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter, for Spire, Spire Missouri, and Spire Alabama:

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	52.4	$	45.3	$	41.8	$	41.8	$	43.3	$	202.8
Spire Missouri		41.0		34.1		30.4		29.4		30.5		139.1
Spire Alabama		8.0		7.7		7.8		8.7		8.9		44.1

The funding policy of Spire Missouri and Spire Alabama is to contribute an amount not less than the minimum required by government funding standards nor more than the maximum deductible amount for federal income tax purposes. Spire Missouri’s contributions to the pension plans in fiscal 2024 are anticipated to be $21.6 into the qualified trusts, and $0 into the non-qualified plans. Spire Alabama’s contributions to the pension plans in fiscal 2024 are anticipated to be $16.4 into the qualified trusts.

Other Postretirement Benefits

Spire and the Utilities provide certain life insurance benefits at retirement. Spire Missouri plans provide for medical insurance after early retirement until age 65. For retirements prior to January 1, 2015, the Missouri West plans provided medical insurance after retirement until death. The Spire Alabama plans provide medical insurance upon retirement until death for certain retirees depending on the type of employee and the date the employee was originally hired.

Net periodic postretirement benefit costs consist of the following components:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	4.8		$	7.5		$	7.3		$	4.0		$	6.3		$	6.2		$	0.7		$	1.1		$	0.9
Interest cost on accumulated postretirement benefit obligation		8.5			6.0			6.0			6.5			4.5			4.5			1.8			1.4			1.3
Expected return on plan assets		(15.8	)		(16.8	)		(16.1	)		(10.5	)		(11.3	)		(10.9	)		(5.0	)		(5.2	)		(4.9	)
Amortization of prior service cost (credit)		0.3			1.0			1.0			0.6			0.7			0.7			(0.3	)		0.3			0.3
Amortization of actuarial gain		(4.0	)		(2.2	)		(1.6	)		(3.2	)		(1.9	)		(1.5	)		(0.5	)		—			—
Subtotal		(6.2	)		(4.5	)		(3.4	)		(2.6	)		(1.7	)		(1.0	)		(3.3	)		(2.4	)		(2.4	)
Regulatory adjustment		0.6			3.3			13.2			1.8			5.0			15.0			(1.3	)		(1.8	)		(1.8	)
Net postretirement benefit (income) cost	$	(5.6	)	$	(1.2	)	$	9.8		$	(0.8	)	$	3.3		$	14.0		$	(4.6	)	$	(4.2	)	$	(4.2	)

Other changes in plan assets and postretirement benefit obligations recognized in OCI include the following:

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial (gain) loss	$	(24.4	)	$	15.8		$	(41.0	)	$	(21.5	)	$	9.8		$	(29.0	)	$	(1.1	)	$	5.9		$	(9.9	)
Amortization of actuarial gain		4.0			2.2			1.6			3.2			1.9			1.5			0.5			—			—
Current year prior service cost		—			(6.3	)		—						(1.1	)		—			—			(5.2	)		—
Amortization of prior service (cost) credit		(0.3	)		(1.0	)		(1.0	)		(0.6	)		(0.7	)		(0.7	)		0.3			(0.3	)		(0.3	)
Subtotal		(20.7	)		10.7			(40.4	)		(18.9	)		9.9			(28.2	)		(0.3	)		0.4			(10.2	)
Regulatory adjustment		20.7			(10.7	)		40.4			18.9			(9.9	)		28.2			0.3			(0.4	)		10.2
Total recognized in OCI	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—

Pursuant to a MoPSC Order, the return on plan assets is based on the market-related value of plan assets implemented prospectively over a four-year period. Gains and losses not yet includible in postretirement benefit cost are amortized only to the extent that such gain or loss exceeds 10% of the greater of the accumulated postretirement benefit obligation or the market-related value of plan assets. Such excess is amortized over the average remaining service life of active participants. Effective December 23, 2021, the $8.6 allowance for recovery in rates for Spire Missouri’s postretirement benefit plans was discontinued. The difference between no recovery in rates and postretirement expense as calculated pursuant to the above and that otherwise would be included in the statements of income and statements of comprehensive income is deferred as a regulatory asset or regulatory liability. Effective with the resolution of the 2022 Missouri rate case in December 2022, net liabilities for postretirement benefits reduced rates $0.9 and $0.1 per year for Missouri East and Missouri West, respectively.

The following table sets forth the reconciliation of the beginning and ending balances of the postretirement benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	148.1		$	204.2		$	114.8		$	151.7		$	29.9		$	48.0
Service cost		4.8			7.5			4.0			6.3			0.7			1.1
Interest cost		8.5			6.0			6.5			4.5			1.8			1.4
Actuarial (gain) loss		(10.6	)		(52.6	)		(13.4	)		(37.7	)		4.2			(13.6	)
Plan amendments		—			(6.2	)		—			(1.0	)		—			(5.2	)
Retiree drug subsidy program		0.2			0.2			0.2			0.2			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Benefit obligation, end of year	$	142.6		$	148.1		$	105.3		$	114.8		$	35.1		$	29.9

In fiscal 2023, the actuarial gains for all qualified Spire plans were driven by the increase in the discount rate used to calculate the benefit obligation, combined with actuarial asset gains resulting from actual trust returns exceeding the expected returns. For Spire Alabama, these gains were more than offset by the loss associated with the difference between actual and assumed enrollment in Health Retirement Accounts. 

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets at beginning of year	$	264.7		$	326.9		$	176.7		$	221.7		$	83.3		$	99.4
Actual return on plan assets		29.9			(51.6	)		18.8			(36.2	)		10.2			(14.3	)
Employer contributions		0.1			0.4			0.1			0.4			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Fair value of plan assets, end of year	$	286.3		$	264.7		$	188.8		$	176.7		$	92.0		$	83.3
Funded status of plans, end of year	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9		$	53.4

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023		2022
Noncurrent assets	$	180.7		$	151.6		$	120.5		$	96.9		$	56.9	$	53.4
Current liabilities		(0.4	)		(0.3	)		(0.4	)		(0.3	)		—		—
Noncurrent liabilities		(36.6	)		(34.7	)		(36.6	)		(34.7	)		—		—
Total	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9	$	53.4

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic postretirement benefit cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial gain	$	(103.3	)	$	(83.3	)	$	(92.3	)	$	(74.2	)	$	(6.1	)	$	(5.6	)
Prior service cost (credit)		7.0			7.1			7.4			7.9			(0.4	)		(0.8	)
Subtotal		(96.3	)		(76.2	)		(84.9	)		(66.3	)		(6.5	)		(6.4	)
Adjustments for amounts included in regulatory assets		96.3			76.2			84.9			66.3			6.5			6.4
Total	$	—		$	—		$	—		$	—		$	—		$	—

The assumptions used to calculate net periodic postretirement benefit costs for Spire Missouri are as follows:

	2023		2022		2021
Weighted average discount rate - Spire Missouri plans		5.80%		2.95%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets - Spire Missouri plans		5.50%		5.75%		5.75%

The assumptions used to calculate net periodic postretirement benefit costs for Spire Alabama are as follows:

	2023		2022		2021
Weighted average discount rate		5.80%		2.95%		2.75%
Expected long-term rate of return on plan assets	4.75%/6.0%		5.00%/6.25%		5.00%/6.25%

The discount rate is based on long-term, high quality bond indices at the measurement date. The expected long-term rate of return on plan assets is based on historical and projected rates of return for current and planned asset classes in the investment portfolio. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns. The overall expected rate of return for the portfolio was developed based on the target allocation for each class.

The assumptions used to calculate the accumulated postretirement benefit obligations are as follows:

	2023		2022
Weighted average discount rate - Spire Alabama plans and Spire Missouri Plans		6.30%		5.80%
Weighted average rate of future compensation increase - Spire Missouri East plans		3.00%		3.00%

The assumed medical cost trend rates at September 30 are as follows:

	2023	2022
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri	6.50%	6.75%
Rate to which the medical cost trend rate is assumed to decline (the ultimate medical cost trend rate)	5.00%	5.00%
Year the rate reaches the ultimate trend	2030	2028

The following tables set forth the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	Target			2023 Actual			2022 Actual
Equity securities		60.0	%		58.9	%		58.7	%
Debt securities		40.0	%		38.1	%		40.5	%
Cash and cash equivalents		—	%		3.0	%		0.8	%
Total		100.0	%		100.0	%		100.0	%

Spire Alabama	Target			2023 Actual			2022 Actual
Equity securities		60.5	%		59.9	%		57.7	%
Debt securities		39.5	%		40.1	%		42.3	%
Total		100.0	%		100.0	%		100.0	%

Missouri and Alabama state laws provide for the recovery in rates of costs accrued pursuant to GAAP provided that such costs are funded through an independent, external funding mechanism. The Utilities have established Voluntary Employees’ Beneficiary Association and Rabbi Trusts as external funding mechanisms. Their investment policies seek to maximize investment returns consistent with their tolerance for risk. Outside investment management specialists are utilized in each asset class. Such specialists are provided with guidelines, where appropriate, designed to ensure that the investment portfolio is managed in accordance with policy. Performance and compliance with the guidelines is regularly monitored. Spire Missouri and Spire Alabama currently invest in mutual funds which are rebalanced periodically to the target allocation. The mutual funds are diversified across U.S. stock and bond markets, and for Spire Alabama, international stock markets.

The following table sets forth expected postretirement benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter for Spire, Spire Missouri, and Spire Alabama:

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	14.6	$	14.8	$	14.9	$	14.8	$	14.5	$	68.6
Spire Missouri		11.6		11.8		11.8		11.7		11.4		52.2
Spire Alabama		2.9		2.9		2.9		2.9		2.9		15.0

The Utilities’ funding policy is to contribute amounts to the trusts equal to the periodic benefit cost calculated pursuant to GAAP as recovered in rates. For both Spire Missouri and Spire Alabama there are no anticipated contributions to the postretirement plans in fiscal 2024.

Other Plans

Spire Services Inc. sponsors a 401(k) plan that cover substantially all employees of Spire Inc. and its subsidiaries. The plan allows employees to contribute a portion of their base pay in accordance with specific guidelines. The cost of the defined contribution plan for Spire Inc. totaled $15.5, for fiscal years 2023, 2022, and 2021, respectively. Spire Missouri provides a match of such contributions within specific limits. The cost of the defined contribution plan for Spire Missouri amounted to $9.1, $10.9, and $10.9 for fiscal years 2023, 2022, and 2021, respectively. Spire Alabama also provides a match of employee contributions within specific limits. The cost of the defined contribution plan for Spire Alabama amounted to $3.1, $3.6, and $2.9 for fiscal years 2023, 2022, and 2021, respectively.

Fair Value Measurements of Pension and Other Postretirement Plan Assets

Spire

The table below categorizes the fair value measurements of the Spire pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	14.8	$	—	$	14.8	$	11.5	$	—	$	11.5
Equity funds - global (including U.S.)		—		139.0		139.0		—		122.2		122.2
Real asset funds		—		55.2		55.2		—		61.0		61.0
Debt securities:
U.S. bond funds		27.8		—		27.8		42.3		—		42.3
U.S. government index funds		36.2		—		36.2		36.1		—		36.1
Global funds (including U.S.)		—		61.7		61.7		—		59.6		59.6
Total	$	78.8	$	255.9	$	334.7	$	89.9	$	242.8	$	332.7

The table below categorizes the fair value measurements of Spire’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	5.1	$	—	$	5.1	$	3.5	$	—	$	3.5
U.S. stock/bond mutual funds		188.2		76.5		264.7		177.1		69.4		246.5
International fund		—		16.5		16.5		0.8		13.9		14.7
Total	$	193.3	$	93.0	$	286.3	$	181.4	$	83.3	$	264.7

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

Spire Missouri

The table below categorizes the fair value measurements of Spire Missouri’s pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	6.8	$	—	$	6.8	$	5.7	$	—	$	5.7
Equity funds - global (including U.S.)		—		99.4		99.4		—		85.7		85.7
Real asset funds		—		40.2		40.2		—		47.2		47.2
Debt securities:
U.S. bond funds		20.9		—		20.9		29.4		—		29.4
U.S. government index funds		28.7		—		28.7		24.6		—		24.6
Global funds (including U.S.)		—		46.0		46.0		—		43.3		43.3
Total	$	56.4	$	185.6	$	242.0	$	59.7	$	176.2	$	235.9

The table below categorizes the fair value measurements of Spire Missouri’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.3	$	—	$	4.3	$	2.7	$	—	$	2.7
U.S. stock/bond mutual funds		184.5		—		184.5		174.0		—		174.0
Total	$	188.8	$	—	$	188.8	$	176.7	$	—	$	176.7

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

Spire Alabama

The table below categorizes the fair value measurements of Spire Alabama’s pension plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.6	$	—	$	4.6	$	3.5	$	—	$	3.5
Equity funds - global (including U.S.)		—		22.9		22.9		—		21.6		21.6
Real asset funds		—		8.7		8.7		—		8.1		8.1
Debt securities:
U.S. bond funds		4.0		—		4.0		7.7		—		7.7
U.S. government index funds		4.3		—		4.3		6.8		—		6.8
Global funds (including U.S.)		—		9.1		9.1		—		9.6		9.6
Total	$	12.9	$	40.7	$	53.6	$	18.0	$	39.3	$	57.3

The table below categorizes the fair value measurements of Spire Alabama’s postretirement plan assets:

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
U.S. stock/bond mutual funds	$	—	$	76.5	$	76.5	$	—	$	69.4	$	69.4
International fund		—		15.5		15.5		—		13.9		13.9
Total	$	—	$	92.0	$	92.0	$	—	$	83.3	$	83.3

Cash and cash equivalents include money market mutual funds valued based on quoted market prices. Debt securities are valued based on broker/dealer quotations or by using observable market inputs. The stock and bond mutual funds are valued at the quoted market price of the identical securities.

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Note 14 - Information by Operating Segment

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

14. INFORMATION BY OPERATING SEGMENT

The Company has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment is the aggregation of the operations of the Utilities. The Gas Marketing segment includes the results of Spire Marketing, a subsidiary engaged in the non-regulated marketing of natural gas and related activities, including utilizing natural gas storage contracts for providing natural gas sales. The Midstream segment includes Spire STL Pipeline, a subsidiary of Spire providing interstate natural gas pipeline transportation services, and Spire Storage, a subsidiary of Spire providing interstate natural gas storage services. Other components of the Company’s consolidated information include Spire’s subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.

Accounting policies are described in Note 1, Summary of Significant Accounting Policies. Intersegment transactions include sales of natural gas from Spire Marketing to Spire Missouri and Spire Alabama, sales of natural gas from Spire Missouri to Spire Marketing, sales of natural gas from Spire Alabama to Spire Marketing, propane transportation services provided by Spire NGL Inc. to Spire Missouri, and propane storage services provided by Spire Missouri to Spire NGL Inc.

Management evaluates the performance of the operating segments based on the computation of net economic earnings. Net economic earnings exclude from reported net income, as applicable, the after-tax impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of other non-recurring or unusual items such as certain regulatory, legislative or GAAP standard-setting actions.

	Gas		Gas
2023	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,456.6	$	179.1	$	29.9	$	0.7		$	—		$	2,666.3
Intersegment revenues		0.3		—		36.2		16.0			(52.5	)		—
Total Operating Revenues		2,456.9		179.1		66.1		16.7			(52.5	)		2,666.3
Depreciation and amortization expense		244.4		1.5		8.4		0.5			—			254.8
Interest expense		139.9		—		8.6		72.1			(34.9	)		185.7
Income tax expense (benefit)		32.7		12.8		3.8		(10.5	)		—			38.8
Net economic earnings (loss)		200.5		47.6		14.1		(34.1	)		—			228.1
Capital expenditures		588.6		0.4		73.6		(0.1	)		—			662.5

	Gas		Gas
2022	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	1,945.6	$	234.9	$	17.4	$	0.6		$	—		$	2,198.5
Intersegment revenues		0.5		—		35.7		15.5			(51.7	)		—
Total Operating Revenues		1,946.1		234.9		53.1		16.1			(51.7	)		2,198.5
Depreciation and amortization expense		227.9		1.4		7.5		0.5			—			237.3
Interest expense		86.4		—		4.9		37.3			(8.8	)		119.8
Income tax expense (benefit)		49.6		11.9		4.5		(7.1	)		—			58.9
Net economic earnings (loss)		202.7		27.0		11.1		(24.5	)		—			216.3
Capital expenditures		528.6		0.9		22.6		0.1			—			552.2

	Gas		Gas
2021	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,118.2	$	96.5	$	19.9	$	0.9		$	—		$	2,235.5
Intersegment revenues		1.1		—		32.7		14.2			(48.0	)		—
Total Operating Revenues		2,119.3		96.5		52.6		15.1			(48.0	)		2,235.5
Depreciation and amortization expense		204.4		1.2		6.9		0.6			—			213.1
Interest expense		74.7		—		4.0		29.3			(1.4	)		106.6
Income tax expense (benefit)		56.9		13.4		4.4		(6.2	)		—			68.5
Net economic earnings (loss)		230.6		47.0		11.1		(22.4	)		—			266.3
Capital expenditures		590.4		0.7		33.0		0.7			—			624.8

Total Assets at End of Year	2023			2022			2021
Gas Utility	$	8,486.7		$	8,042.8		$	7,615.4
Gas Marketing		332.0			638.7			466.1
Midstream		574.3			446.0			413.8
Other		2,533.3			2,705.5			2,193.3
Eliminations		(1,612.7	)		(1,749.3	)		(1,332.2	)
Total Assets	$	10,313.6		$	10,083.7		$	9,356.4

Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings	2023			2022			2021
Net Income	$	217.5		$	220.8		$	271.7
Adjustments, pre-tax:
Missouri regulatory adjustments		—			—			(9.0	)
Fair value and timing adjustments		11.4			(11.4	)		3.3
Acquisition and divestiture activities		2.5			—			(1.3	)
Income tax adjustments		(3.3	)		6.9			1.6
Net Economic Earnings	$	228.1		$	216.3		$	266.3

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Note 15 - Regulatory Matters

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Public Utilities Disclosure [Text Block]

15. REGULATORY MATTERS

As discussed below for Spire Missouri and Spire Alabama, the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and regulatory liabilities related to the PGA clauses and the GSA rider are both labeled Unamortized Purchased Gas Adjustments herein.

The following regulatory assets and regulatory liabilities were reflected in the balance sheets of the Company, Spire Missouri and Spire Alabama as of September 30, 2023 and 2022.

	Spire				Spire Missouri				Spire Alabama
September 30	2023		2022		2023		2022		2023		2022
Regulatory Assets:
Current:
Unamortized purchased gas adjustments	$	293.2	$	322.2	$	269.4	$	275.1	$	21.7	$	43.8
Other		55.1		33.2		23.7		13.0		19.9		13.1
Total Current Regulatory Assets		348.3		355.4		293.1		288.1		41.6		56.9
Noncurrent:
Future income taxes due from customers		144.5		137.8		136.2		129.2		2.0		2.2
Pension and postretirement benefit costs		261.0		294.5		189.1		222.9		67.8		66.5
Cost of removal		633.2		493.7		97.0		25.2		536.2		468.5
Unamortized purchased gas adjustments		23.0		—		23.0		—		—		—
Energy efficiency		56.3		57.2		56.3		57.2		—		—
Other		131.2		129.2		116.0		113.1		0.9		1.0
Total Noncurrent Regulatory Assets		1,249.2		1,112.4		617.6		547.6		606.9		538.2
Total Regulatory Assets	$	1,597.5	$	1,467.8	$	910.7	$	835.7	$	648.5	$	595.1
Regulatory Liabilities:
Current:
Other	$	7.3	$	3.7	$	—	$	—	$	—	$	—
Total Current Regulatory Liabilities		7.3		3.7		—		—		—		—
Noncurrent:
Deferred taxes due to customers		128.0		145.3		114.8		127.9		—		—
Pension and postretirement benefit costs		185.2		172.6		156.5		143.6		17.9		19.4
Accrued cost of removal		126.6		32.9		90.4		—		—		—
Unamortized purchased gas adjustments		11.2		53.0		11.2		53.0		—		—
Other		21.4		14.4		16.5		7.3		3.3		3.6
Total Noncurrent Regulatory Liabilities		472.4		418.2		389.4		331.8		21.2		23.0
Total Regulatory Liabilities	$	479.7	$	421.9	$	389.4	$	331.8	$	21.2	$	23.0

A portion of the Company’s and Spire Missouri's regulatory assets are not earning a return, as shown in the table below:

	Spire				Spire Missouri
September 30	2023		2022		2023		2022
Pension and postretirement benefit costs	$	133.4	$	152.9	$	133.4	$	152.9
Future income taxes due from customers		142.5		135.6		136.2		129.2
Unamortized purchase gas adjustments		292.4		275.1		292.4		275.1
Other		104.2		122.7		104.2		122.7
Total Regulatory Assets Not Earning a Return	$	672.5	$	686.3	$	666.2	$	679.9

Like all the Company’s regulatory assets, these regulatory assets as of September 30, 2023 are expected to be recovered from customers in future rates. The recovery period for the future income taxes due from customers and pension and other postretirement benefit costs could be 20 years or longer, based on current Internal Revenue Service guidelines and average remaining service life of active participants, respectively. The recovery period for the PGA assets is less than two years. The other items not earning a return are expected to be recovered over a period not to exceed 15 years, consistent with precedent set by the MoPSC, except for certain debt costs expected to be recovered over the related debt term, up to 35 years. Spire Alabama does not have any regulatory assets that are not earning a return.

Spire Missouri

As authorized by the MoPSC, the PGA clause allows Spire Missouri to flow through to customers, subject to prudence review by the MoPSC, the cost of purchased gas supplies. To better match customer billings with market natural gas prices, Spire Missouri is allowed to file to modify, on a periodic basis, the level of gas costs in its PGA. Certain provisions of the PGA clause are included below:

•  Spire Missouri has a risk management policy that allows for the purchase of natural gas derivative instruments with the goal of managing price risk associated with purchasing natural gas on behalf of its customers. The MoPSC clarified that costs, cost reductions, and carrying costs associated with the Utility’s use of natural gas derivative instruments are gas costs recoverable through the PGA mechanism.

•  The tariffs allow Spire Missouri flexibility to make up to three discretionary PGA changes during each year, in addition to its mandatory November PGA change, so long as such changes are separated by at least two months.

•  Spire Missouri is authorized to apply carrying costs to all over- or under-recoveries of gas costs, including cost increases and cost reductions associated with the use of derivative instruments, including cash payments for margin deposits.

•  Pre-tax income from off-system sales and capacity release revenues is shared with customers (such that customers receive 75% and Spire Missouri receives 25%).

Pursuant to the provisions of the PGA clause, the difference between actual costs incurred and costs recovered through the application of the PGA clause, as well as the actual amount of off-system sales and capacity release revenues allocated to customers, are reflected as a regulatory asset or liability at the end of the fiscal year. At that time, the balance is classified as a current asset or current liability and recovered from, or credited to, customers over an annual period commencing in the subsequent November. The balance in the current account is amortized as amounts are reflected in customer billings. In fiscal 2023, Spire Missouri filed two changes to its tariff, which were approved and became effective November 29, 2022 and January 19, 2023. 

In mid- February 2021, the central U.S. experienced a period of unusually severe cold weather (“Winter Storm Uri”), and Spire Missouri implemented an Operational Flow Order (OFO) to preserve the integrity of its distribution system. During this time, Spire Missouri was required to purchase additional natural gas supply, both to ensure adequate supply for its firm utility customers, and to cover the shortfall created when third-party marketers failed to deliver natural gas supply to its city gates on behalf of their customers. In accordance with its MoPSC-approved OFO tariff, Spire Missouri invoiced the cost of gas and associated penalties totaling $195.8 to non-compliant marketers and recorded accounts receivable. Recoveries collected are an offset to cost of natural gas for firm utility customers through the PGA and Actual Cost Adjustment (ACA), so are net income neutral to Spire Missouri. The three largest counterparties did not remit payment when due, so Spire Missouri filed suit against them in federal court to recover the invoiced amounts. In late February 2022, the parties to the OFO waiver suits agreed to a settlement in principle, pursuant to which marketers will reimburse Spire Missouri for the actual cost of its incremental gas purchases to serve marketers’ customers during Winter Storm Uri, so Spire Missouri reduced revenue, accounts receivable, cost of gas and regulatory liabilities by approximately $150 in the second quarter of fiscal 2022. The settlement, which reduced the total amount due from the three marketers to approximately $42, was approved by the MoPSC in late May 2022, and the marketers are making timely payments to Spire Missouri.

As a result of the significant net deferred gas costs and average inventory cost in the second quarter of fiscal 2021, primarily due to Winter Storm Uri, Spire Missouri filed for and received MoPSC approval for an adjustment to the PGA tariff to increase a Filing Adjustment Factor (FAF) credit on customers' bills for three years. This lowered the net PGA rate to mitigate the impact of Winter Storm Uri costs on customers. All gas costs will eventually be recovered by Spire Missouri through the PGA or ACA mechanisms and carrying costs will be applied per the terms of the tariff.

In the first quarter of fiscal 2022, the MoPSC approved Spire Missouri compliance tariffs with an effective date of December 23, 2021, consistent with its order in Spire Missouri’s general rate case. These new tariffs were designed to increase Spire Missouri’s aggregate annual gross base rate revenues by $72.2, which includes $24.9 incremental and $47.3 already being collected through the Infrastructure System Replacement Surcharge (ISRS). The MoPSC required Spire Missouri to defer all non-operational overheads from December 23, 2021 through September 30, 2022 into a regulatory asset totaling $42.8. On April 1, 2022, Spire Missouri filed tariff sheets to initiate a new general rate case proceeding intended to address the deferred amounts, along with other matters. The parties reached a Full Unanimous Stipulation and Agreement (the “Stipulation”) to resolve all issues in the case, which was filed with the MoPSC on November 4, 2022. On November 18, 2022, the Stipulation was approved, including authorization of $78.0 in new base rate revenue (including $19.0 already being collected through ISRS) and recovery of deferred overheads through amortization of the related regulatory asset. New base rates became effective on December 26, 2022.

ISRS allows Spire Missouri expedited recovery for its investment to replace qualifying components of its infrastructure without the necessity of a formal rate case. As noted above, all prior ISRS revenues were reset to zero as of December 26, 2022 as a result of Spire Missouri's most recent base rate case. On April 20, 2023, the MoPSC approved an incremental annual ISRS revenue increase of $7.7, effective May 6, 2023, reflecting eligible pipe replacement from October 2022 through February 2023. On October 4, 2023, the MoPSC approved an incremental annual ISRS revenue increase of $12.4, effective October 23, 2023, reflecting eligible pipe replacement from March 2023 through August 2023.

On May 27, 2022, the MoPSC staff filed an ACA Review Recommendation and Report for the ACA period that first includes transportation charges incurred by Spire Missouri for service on the Spire STL Pipeline. That report concluded that the transaction complied with Missouri affiliate transaction rules and was prudent, and it recommended no disallowance of any Spire STL Pipeline related costs from the ACA mechanism. On July 11, 2022, Spire Missouri filed its response comments in support of the recommendation. The Missouri Office of the Public Counsel and Environmental Defense Fund (EDF) filed comments on July 29 and August 1, 2022, respectively, raising concerns about the Spire STL Pipeline transaction, the ACA process itself, and other matters. On January 6, 2023, Spire Missouri filed a Partial Stipulation and Agreement resolving all other issues raised by the MoPSC staff in its Recommendation and Report. The partial stipulation was approved by the MoPSC on January 25, 2023, resulting in a $0.6 credit to the ACA balance, but issues relating to Spire STL Pipeline costs remained contested. An evidentiary hearing on this matter was scheduled to be held  July 25-26, 2023; however, on July 21, 2023, MoPSC suspended the procedural schedule in recognition that the parties had reached an agreement in principle to resolve the matter via settlement stipulation. The stipulation and agreement was approved by the Commission on August 23, 2023 and included an increase in customer assistance program funding among other non-monetary commitments.

In 2022, the MoPSC initiated their annual ACA dockets (GR-2022-0135 and GR-2022-0136) to audit gas commodity and transportation costs for the 2020-2021 heating season, which included the impact of Winter Storm Uri on Spire Missouri's natural gas portfolio. On December 15, 2022, the MoPSC staff filed its Reports and Recommendations in these cases proposing various disallowances relating to imbalance cash-outs and an off-system sale. On January 19, 2023, Spire Missouri filed its response to this proposal setting forth its position that there is no basis in law or fact for either disallowance. On July 12, 2023, the MoPSC entered a scheduling order in this matter which includes several rounds of pre-filed testimony prior to an evidentiary hearing to be held in early May 2024. On November 2, 2023, Spire Missouri filed an unopposed settlement stipulation by which the MoPSC Staff agreed to withdraw its recommendation of a proposed disallowance relating to imbalance cash-outs. The proposed disallowance relating to an off-system sale remains pending in the case. Management believes the likelihood of an unfavorable outcome is remote.

Spire Alabama

In September 2022, the APSC approved the renewal of RSE through September 30, 2025, with certain modifications to the previous terms. Under RSE, the APSC conducts reviews in March, June and September to determine whether Spire Alabama’s return on average common equity (ROE) at the end of the rate year will be within the allowed range of return. Reductions in rates can be made quarterly to bring the projected ROE within the allowed range; increases, however, are allowed only once each rate year, effective December 1, and cannot exceed 4% of prior-year revenues. Effective October 1, 2022, Spire Alabama's allowed range of ROE is 9.50% to 9.90% with an adjusting point of 9.70%. Previously, the allowed range was 10.15% to 10.65% with an adjusting point of 10.40%. Spire Alabama is subject to a performance-based adjustment of plus or minus 10 basis points to the ROE adjusting point, based upon the terms of the previously approved Accelerated Infrastructure Modernization (AIM) Program tariff; however, Spire applied for and received approval to suspend the operation of the AIM performance-based adjustment for 2022, 2023, and 2024, impacting fiscal years 2023 through 2025. Spire Alabama’s equity as a percent of total capitalization is limited to 55.5%, and Average Common Equity growth is limited to 6.00% each year.

The inflation-based Cost Control Measure (CCM) established by the APSC allows for annual changes in operation and maintenance (“O&M”) expense relative to an index range. Effective October 1, 2022, the Base Year O&M expense was computed by averaging the actual O&M expenses for 2020, 2021, and 2022. The Base CPI-U was computed by averaging the August CPI-U for 2020, 2021, 2022. The “Index” is computed by measuring the change from the Base CPI-U to the August CPI-U of the most recently completed fiscal year, less a factor of 1.50%. The index range will be computed by adjusting the Index plus or minus 1.50%. If rate year O&M expense falls within the index range, no adjustment is required. If rate year O&M expense exceeds the index range, three-quarters of the difference is returned to customers through future rate adjustments. To the extent rate year O&M is less than the index range, Spire Alabama benefits by one-half of the difference through future rate adjustments. If a benefit is achieved, the Base Year and the Base CPI-U for the following year will each be reset to an average of the three preceding completed years. If a benefit is not achieved, the Base Year and Base CPI-U will not be updated. Certain items that fluctuate based on situations demonstrated to be beyond Spire Alabama’s control may be excluded from the CCM calculation.

The RSE reduction for September 30, 2021 following the year-end point of test was $2.2 to bring the expected rate of return on average common equity to within the allowed rate of return. The CCM benefit for rate year 2021 was $8.8. To mitigate the impact on ratepayers, Spire Alabama requested and received approval from the APSC to recover the 2021 CCM benefit over five years (with recognition of revenue only up to 24 months in advance of recovery). As a part of the annual update for RSE, on December 29, 2021, Spire Alabama filed an increase for rate year 2022 of $5.3. The 2021 RSE reduction of $2.2, the five-year recovery of the 2021 CCM benefit of $8.8 and the annual RSE increase of $5.3 were all effective on January 1, 2022. There was no RSE reduction in 2022 for the January 31, April 30, July 31 or September 30 quarterly points of test. Spire Alabama recorded a CCM benefit for rate year 2022 of $17.2. Similar to the rate year 2021 CCM benefit, Spire requested and received approval to recover the rate year 2022 CCM benefit over five years. On October 26, 2022, Spire Alabama made its annual RSE rate filing with the APSC, presenting the utility’s budget for the fiscal year ended September 30, 2023, including net income and a calculation of allowed ROE. The budget reflected the start of amortization of the accumulated deferred income tax (ADIT) adjustment related to the Tax Cuts and Jobs Act of 2017 (TCJA). New rates designed to provide an annual revenue increase of $15.0 became effective January 1, 2023. There was no RSE reduction in 2023 for the March 31, June 30 or September 30 points of test. Spire Alabama recorded a CCM benefit for rate year 2023 of $4.4. On October 26, 2023, Spire Alabama made its annual RSE rate filing, presenting the utility’s budget for the fiscal year ending September 30, 2024, including net income and a calculation of allowed ROE. New rates designed to provide an annual revenue increase of $15.8 are anticipated to become effective December 1, 2023.

Spire Alabama’s rate schedules for natural gas distribution charges contain a GSA rider which permits the pass-through to customers of changes in the cost of gas supply. Spire Alabama’s tariff provides a temperature adjustment mechanism, also included in the GSA rider, which is designed to moderate the impact of departures from normal temperatures on Spire Alabama’s earnings. The temperature adjustment applies primarily to residential, small commercial and small industrial customers. Other non-temperature weather-related conditions that may affect customer usage are not included in the temperature adjustment. There is also a mechanism under Spire Alabama's GSA rider allowing the utility to create value through off-system sales of excess natural gas supply and capacity and to give 75% of the value created to customers while retaining 25%. As of April 2022, the first $1.6 of value from capacity release goes entirely to customers before Spire Alabama retains 25%. In the past year, Spire Alabama filed GSA rate increases effective December 1, 2022 and  January 1, 2023, and GSA rate decreases effective October 1, 2023 and anticipated to become effective December 1, 2023, primarily attributable to changes in natural gas prices.

The APSC approved an Enhanced Stability Reserve (ESR) in 1998, which was subsequently modified and expanded in 2010. As currently approved, the ESR provides deferred treatment and recovery for the following: (1) extraordinary O&M expenses related to environmental response costs; (2) extraordinary O&M expenses related to self-insurance costs that exceed $1.0 per occurrence; (3) extraordinary O&M expenses, other than environmental response costs and self-insurance costs, resulting from a single force majeure event or multiple force majeure events greater than $0.3 and $0.4, respectively, during a rate year; and (4) negative individual large commercial and industrial customer budget revenue variances that exceed $0.4 during a rate year. Charges to the ESR are subject to certain limitations which may disallow deferred treatment and which prescribe the timing of recovery. Subject to APSC authorization, Spire Alabama expects to be able to recover underfunded ESR balances over a five-year amortization period with an annual limitation of $0.7. Amounts in excess of this limitation are deferred for recovery in future years.

Spire

In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is affected by the following regulatory matters.

Spire Gulf has similar rate regulation to Spire Alabama. Its RSE rate-setting mechanism was renewed in September 2021 for a four-year term through September 2025. The RSE allowed ROE range was 10.45% to 10.95% with an adjusting point of 10.70% in fiscal 2021, while the ROE range is 9.70% to 10.30% with an adjusting point of 9.95% for fiscal 2022 through fiscal 2025. In October 2021 and 2022, Spire Gulf made its annual RSE rate filings with the APSC based on its budget for the new fiscal year and an allowed ROE of 9.95%, and new rates designed to provide increased annual revenues of $1.0 and $2.5 became effective at the beginning of January 2022 and 2023, respectively. The fiscal 2023 budget reflected the start of amortization of the excess ADIT from the TCJA. Spire Gulf filed its RSE point of test as of April 30, 2023 with the APSC reflecting that its projected ROE exceeded the allowed ROE resulting in an annualized refund of $1.8 that became effective July 1, 2023. Spire Gulf filed its RSE point of test as of September 30, 2023, reflecting that its actual ROE exceeded the allowed ROE resulting in an additional annualized refund of $2.0 that are anticipated to become effective December 1, 2023. The CCM has similar evaluation and recovery provisions when expenses exceed or are under a band of plus or minus 1.50% around the CPI-U inflated O&M per customer expense level from the base year, excluding expenses for pensions and gas bad debt. The base year for the O&M index was 2017 for fiscal 2021 and was 2021 for fiscal 2022. Since a CCM benefit was recorded in fiscal 2022, the base year O&M index for fiscal 2023 through fiscal 2025 will be the 2022 O&M level. Spire Gulf recorded a CCM benefit for rate year 2021 of $2.3 to revenues, resulting in a net income benefit of $1.6. A CCM benefit of $1.7 was recorded for fiscal 2022 to an economic development fund that can be used for economic development purposes subject to APSC approval. Spire Gulf’s O&M for fiscal 2023 was within the O&M per customer inflation adjusted band. Spire Gulf has a Cast Iron Main Replacement Factor (CIF) that provides an enhanced return on the pro-rata costs associated with cast iron main replacement exceeding 10 miles per year based on a 75% weighting for the equity content. Capital expenditures recovered under the CIF have not increased since fiscal 2019 pursuant to applicable tariff provisions although the Company is continuing to recover costs of service associated with accumulated expenditures under the CIF. Spire Gulf also has an ESR for negative revenue variances over $0.1 or a force majeure event expense of $0.1 (or two events that exceed $0.15) and an Environmental Cost Recovery Factor that recovers 90% of prudently incurred costs for compliance with environmental laws, rules and regulations. Spire Gulf has an APSC-approved intercompany revolving credit agreement with Spire to borrow in a principal amount not to exceed $75.0 and to loan up to $25.0.

Spire Mississippi utilizes a formula rate-making process under the Rate Stabilization Adjustment Rider (RSA). An allowed return on equity (currently 10.04%) is computed annually and compared to the actual return on equity based on a rate year ending June 30. If the actual equity return on an end of period rate base is beyond the allowed return on equity by 1.0%, then 75% of any shortfall is recovered through a rate increase and 50% of any excess results in a rate decrease. Updates may include known and measurable adjustments to historic costs from the 12 months ended June 30, submitted September 15 for an effective date of November 1, unless disputed by the Mississippi Public Utilities Staff (MPUS), with any disputes to be resolved by the Mississippi Public Service Commission (MSPSC) by January 15 of the following year. The MSPSC approved stipulation agreements between the MPUS and Spire Mississippi that provided for increased annual revenues of $0.8 through rates effective on February 1, 2022 and an additional $0.8 effective on January 1, 2023. Spire Mississippi’s RSA filing made on September 1, 2023 reflected a rate increase of $1.3 and is pending review by the MPUS. Additionally, a Supplemental Growth Rider provides recovery of certain Spire Mississippi system expansion projects to serve qualified economic development projects.

In August 2018, the FERC approved an order issuing Certificates of Public Convenience and Necessity (“FERC Certificates”) for the Spire STL Pipeline ( “August 2018 Order”). In  June 2021, the U.S. Court of Appeals for the District of Columbia Circuit issued an order vacating the FERC Certificates and remanding the matter back to the FERC for further action. In  September and December 2021, the FERC issued temporary certificates for the continued authorized operation of the Spire STL Pipeline pending the outcome of its determination on remand. On December 15, 2022, the FERC issued its order on remand reissuing permanent FERC Certificates for the continued operation of the Spire STL Pipeline, and that order is final and no longer appealable.

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Note 16 - Commitments and Contingencies

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

16. COMMITMENTS AND CONTINGENCIES

Commitments

The Company and the Utilities have entered into contracts with various counterparties, expiring on dates through calendar 2039, for the storage, transportation, and supply of natural gas. Minimum payments required under the contracts in place at September 30, 2023, are estimated at $1,613.2, $1,182.0 and $251.6 for the Company, Spire Missouri and Spire Alabama, respectively. Additional contracts are generally entered into prior to or during the heating season of November through April. The Utilities recover their costs from customers in accordance with their PGA clauses or GSA riders.

In May 2023, Spire entered into an agreement to acquire MoGas Pipeline, an interstate natural gas pipeline, and Omega Pipeline, a connected gas distribution system, from CorEnergy Infrastructure Trust, Inc., for $175 cash, subject to customary working capital and other closing adjustments. Spire has received a request for additional information ("Second Request") from the Federal Trade Commission (FTC) with regard to this proposed acquisition. The Company is cooperating fully with the FTC regarding the Second Request and expects to close in the second quarter of fiscal 2024 subject to receiving FTC approval. 

A consolidated subsidiary of Spire is a limited partner in Inter-Atlantic Energy Capital Ventures, L.P., an unconsolidated partnership focusing on sustainability initiatives largely tied to the natural gas utility sector. Spire committed to contribute a total of $10.0 of capital to the partnership as and when requested by the general partner. As of September 30, 2023, the remaining unfunded commitment was $4.9.

Contingencies

The Company and the Utilities account for contingencies, including environmental liabilities, in accordance with accounting standards under the loss contingency guidance of ASC Topic 450, Contingencies, when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

In addition to matters noted below, the Company and the Utilities are involved in other litigation, claims, and investigations arising in the normal course of business. Management, after discussion with counsel, believes the final outcome will not have a material effect on the statements of income, balance sheets, and statements of cash flows of the Company, Spire Missouri, or Spire Alabama. However, there is uncertainty in the valuation of pending claims and prediction of litigation results.

The Company and the Utilities own and operate natural gas distribution, transmission, and storage facilities, the operations of which are subject to various environmental laws, regulations, and interpretations. While environmental issues resulting from such operations arise in the ordinary course of business, such issues have not materially affected the Company’s or Utilities’ financial position and results of operations. As environmental laws, regulations, and their interpretations change, the Company or the Utilities may incur additional environmental liabilities that may result in additional costs, which may be material.

In the natural gas industry, many gas distribution companies have incurred environmental liabilities associated with sites they or their predecessor companies formerly owned or operated where manufactured gas operations took place. The Utilities each have former manufactured gas plant (MGP) operations in their respective service territories, some of which are discussed under the Spire Missouri and Spire Alabama headings below. To the extent costs are incurred associated with environmental remediation activities, the Utilities would request authority from their respective regulators to defer such costs (less any amounts received from insurance proceeds or as contributions from other potentially responsible parties (PRPs)) and collect them through future rates.

To date, costs incurred for all Spire MGP sites for investigation, remediation and monitoring have not been material. However, the amount of costs relative to future remedial actions at these and other sites is unknown and may be material. The actual future costs that Spire Missouri and Spire Alabama may incur could be materially higher or lower depending upon several factors, including whether remediation will be required, final selection and regulatory approval of any remedial actions, changing technologies and government regulations, the ultimate ability of other PRPs to pay, and any insurance recoveries.

In 2020, Spire retained an outside consultant to conduct probabilistic cost modeling of its former MGP sites in Missouri and Alabama. The purpose of this analysis was to develop an estimated range of probabilistic future liability for each of their MGP sites. That analysis, completed in March 2021, provided a range of demonstrated possible future expenditures to investigate, monitor and remediate the former MGP sites. Spire Missouri and Spire Alabama have recorded their best estimates of the probable expenditures that relate to these matters. The amount remains immaterial, and Spire Missouri, Spire Alabama and the Company do not expect potential liabilities that may arise from remediating these sites to have a material impact on their future financial condition or results of operations.

Spire Missouri

Spire Missouri has identified three former MGP sites in the city of St. Louis, Missouri (the “City”) where costs have been incurred and claims have been asserted. Spire Missouri has enrolled two of the sites in the Missouri Department of Natural Resources (MoDNR) Brownfields/Voluntary Cleanup Program (BVCP). The third site is the result of an assertion by the United States Environmental Protection Agency (EPA).

In conjunction with redevelopment of the Carondelet Coke site, Spire Missouri and another former owner of the site entered into an agreement (the “Remediation Agreement”) with the City development agencies, the developer, and an environmental consultant that obligates one of the City agencies and the environmental consultant to remediate the site and obtain a No Further Action (NFA) letter from the MoDNR. The Remediation Agreement also provides for a release of Spire Missouri and the other former site owner from certain liabilities related to the past and current environmental condition of the site and requires the developer and the environmental consultant to maintain certain insurance coverage, including remediation cost containment, premises pollution liability, and professional liability. The operative provisions of the Remediation Agreement were triggered on December 20, 2010, on which date Spire Missouri and the other former site owner, as full consideration under the Remediation Agreement, paid a small percentage of the cost of remediation of the site. The property was divided into seven parcels, and MoDNR NFA letters have been received for six of the parcels. Remediation is ongoing on the last parcel.

In a letter dated June 29, 2011, the Attorney General for the State of Missouri informed Spire Missouri that the MoDNR had completed an investigation of the second site, Station A. The Attorney General requested that Spire Missouri participate in the follow up investigations of the site. In a letter dated January 10, 2012, Spire Missouri stated that it would participate in future environmental response activities at the site in conjunction with other PRPs. Accordingly, Spire Missouri entered into a cost sharing agreement for remedial investigation with other PRPs. MoDNR never approved the agreement, so no remedial investigation took place. Recently, Spire Missouri was approached by a real estate developer interested in purchasing the northern half of the Station A site and developing the same for industrial purposes. Consequently, Spire Missouri is now in discussions with the developer, other PRPs and MoDNR to develop a new remedial investigation plan for the site.

Additionally, in correspondence dated November 30, 2016, Region 7 of the EPA has asserted that Spire Missouri is liable under Section 107(a) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) for alleged coal gas waste contamination at a third site, Station B. Spire Missouri and the site owner notified the EPA that information and data provided by the EPA to date does not rise to the level of documenting a threat to the public health or environment. As such, in March 2017 Spire Missouri requested more information from the EPA. Spire Missouri never received a response from the EPA.

Spire Missouri has notified its insurers that it seeks reimbursement for costs incurred in the past and future potential liabilities associated with these MGP sites. While some of the insurers have denied coverage and reserved their rights, Spire Missouri retains the right to seek potential reimbursements from them.

On March 10, 2015, Spire Missouri received a Section 104(e) information request under CERCLA from EPA Region 7 regarding the former Thompson Chemical/Superior Solvents site in the City. In turn, Spire Missouri issued a Freedom of Information Act (FOIA) request to the EPA on April 3, 2015, to identify the basis of the inquiry. The FOIA response from the EPA was received on July 15, 2015, and a response was provided to the EPA on August 15, 2015. Spire Missouri has received no further inquiry from the EPA regarding this matter.

In its western service area, Spire Missouri has six owned MGP sites enrolled in the BVCP, including Joplin MGP #1, St. Joseph MGP #1, Kansas City Coal Gas Station B, Kansas City Station A Railroad area, Kansas City Coal Gas Station A, and Independence MGP #2. Source removal has been conducted at all the owned sites since 2003 with the exception of Joplin. On September 15, 2016, a request was made with the MoDNR for a restrictive covenant use limitation with respect to Joplin. Remediation efforts at the six sites are at various stages of completion, ranging from groundwater monitoring and sampling following source removal activities to the aforementioned request for the Joplin site. As part of its participation in the BVCP, Spire Missouri communicates regularly with the MoDNR with respect to its remediation efforts and monitoring activities at these sites. On May 11, 2015, MoDNR approved the next phase of investigation at the Kansas City Station A Railroad area.

Spire Alabama

Spire Alabama is in the chain of title of nine former MGP sites, four of which it still owns, and five former manufactured gas distribution sites, one of which it still owns. All are located in the state of Alabama.

In 2011, a removal action was completed and an NFA letter was received at the Huntsville MGP site pursuant to an Administrative Settlement Agreement and Order on Consent among the EPA, Spire Alabama and the current site owner.

In 2012, Spire Alabama responded to an EPA Request for Information Pursuant to Section 104 of CERCLA relating to the 35th Avenue Superfund Site located in North Birmingham, Jefferson County, Alabama. Spire Alabama was identified as a PRP under CERCLA for the cleanup of the site or costs the EPA incurs in cleaning up the site. At this point, Spire Alabama has not been provided information that would allow it to determine the extent, if any, of its potential liability with respect to the 35th Avenue Superfund Site and vigorously denies its inclusion as a PRP.

Assessments were performed by the EPA of the former MGP sites in Gadsden and Anniston, and NFA letters were received after each assessment.

Spire

In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is aware of the following contingent matters.

Spire Marketing, along with many natural gas industry participants, faced the unprecedented effects of Winter Storm Uri in February 2021. Numerous natural gas producers and midstream operators were unable to deliver natural gas to market as they experienced wellhead freeze-offs, power outages and equipment failure due to the extreme weather. These events resulted in supply curtailments, and related notices of force majeure to excuse performance, from and to certain counterparties. Further, these events have made Spire Marketing subject to various commercial disputes (including regarding force majeure). As such, Spire Marketing has recorded an estimate of potential liabilities for damages based on communications with counterparties and the facts and circumstances surrounding each transaction. These estimates are adjusted as new facts emerge or settlement agreements are reached, and it is possible that final settlement amounts may materially differ from the current estimate.

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Note 17 - Leases

12 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Lessee, Operating Leases [Text Block]

17. LEASES

The lease agreement covering the Company’s primary office space in St. Louis extends through February 2035, with an option to renew for an additional five years. Spire Alabama’s lease agreement for office space in Birmingham extends through January 2037, with an option to renew for two additional five-year terms. The lease agreement covering Spire Marketing and Spire Storage office space in Houston extends through December 2028, with options to terminate three years earlier or to renew for an additional five years. The renewal options in the St. Louis and Houston leases are reasonably certain to be exercised and are included in the lease term used to determine the right-of-use assets and lease liabilities. The Company and its subsidiaries have other relatively minor rental arrangements for real estate and equipment with remaining terms of up to ten years.

Operating lease cost, cash flow and noncash information are shown in the following table.

	Spire						Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021		2023		2022		2021
Operating lease cost, including amounts capitalized	$	7.3	$	7.4	$	7.2	$	0.5	$	0.5	$	0.4	$	2.0	$	2.1	$	2.1
Cash flow and noncash information about operating leases:
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities		7.3		7.3		7.2		0.5		0.5		0.4		2.1		2.1		2.1
Right-of-use assets obtained in exchange for lease liabilities		0.8		24.6		—		0.8		1.1		—		—		23.5		—

The following table shows year-end balance sheet and weighted-average information about operating leases.

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Right-of-use assets	$	70.6		$	73.7		$	2.1		$	1.7		$	19.2		$	20.2
Lease liabilities, current		6.8			6.5			0.5			0.4			1.9			1.9
Lease liabilities, noncurrent		70.2			73.7			1.8			1.5			23.5			24.6
Weighted-average remaining lease term (in years)		14.1			15.0			5.6			5.1			13.3			14.3
Weighted-average discount rate		4.2	%		4.1	%		3.3	%		2.2	%		3.7	%		3.7	%

On the balance sheets, right-of-use assets are included in “Deferred Charges and Other Assets: Other,” current lease liabilities are in “Current Liabilities: Other,” and noncurrent lease liabilities are in “Deferred Credits and Other Liabilities: Other.”

Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2023.

	Spire			Spire Missouri			Spire Alabama
2024	$	6.9		$	0.5		$	1.9
2025		7.5			0.6			2.2
2026		7.5			0.4			2.2
2027		7.4			0.3			2.3
2028		7.4			0.3			2.3
Thereafter		65.9			0.5			21.7
Total undiscounted lease payments		102.6			2.6			32.6
Less present value discount		(25.6	)		(0.3	)		(7.2	)
Total current and noncurrent lease liabilities	$	77.0		$	2.3		$	25.4

There are no significant finance leases, short-term leases, subleases, variable lease payments, residual value guarantees, restrictions or covenants pertaining to leases.

The Company elected, for all asset classes, not to recognize right-of-use assets and lease liabilities for short-term leases. Instead, the lease payments for short-term leases are recognized in profit or loss on a straight-line basis over the lease term and variable lease payments are recognized in the period in which the obligation for those payments is incurred. The Company elected, for all asset classes, not to separate nonlease components from lease components and instead to account for each separate lease component and the nonlease components associated with that lease component as a single lease component.

The discount rate used for all the leases is the applicable incremental borrowing rate, which is the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. For a subsidiary lessee, the rate applicable to the subsidiary is used unless the lease terms are influenced by parent credit.

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Insider Trading Arrangements

12 Months Ended

Sep. 30, 2023

Insider Trading Arr Line Items

Material Terms of Trading Arrangement [Text Block]

Item 9B. Other Information

During the quarterly period ended September 30, 2023, no director or officer of the Company adopted or terminated any contract, instruction or written plan for the purchase or sale of securities of the Company intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act or any “non-Rule 10b5-1 trading arrangement” (as defined in the Exchange Act).

Rule 10b5-1 Arrangement Adopted [Flag]

false

Non-Rule 10b5-1 Arrangement Adopted [Flag]

false

Rule 10b5-1 Arrangement Terminated [Flag]

false

Non-Rule 10b5-1 Arrangement Terminated [Flag]

false

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Significant Accounting Policies (Policies)

12 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Basis of Accounting, Policy [Policy Text Block]

BASIS OF PRESENTATION – These notes are an integral part of the accompanying audited financial statements of Spire Inc. (“Spire” or the “Company”) presented on a consolidated basis, Spire Missouri Inc. (“Spire Missouri”) and Spire Alabama Inc. (“Spire Alabama”). Spire Missouri, Spire Alabama and Spire EnergySouth Inc. (“Spire EnergySouth”) are wholly owned subsidiaries of Spire. Spire Missouri, Spire Alabama and the subsidiaries of Spire EnergySouth (Spire Gulf Inc. and Spire Mississippi Inc.) are collectively referred to as the “Utilities.” Unless otherwise indicated, references to years herein are references to the fiscal years ending September 30 for the Company and its subsidiaries.

The accompanying audited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial position, results of operations and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not been eliminated from their separate financial statements.

NATURE OF OPERATIONS – Spire has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment consists of the regulated natural gas distribution operations of the Company and is the core business segment of Spire in terms of revenue and earnings. The Gas Utility segment is comprised of the operations of: Spire Missouri, serving St. Louis, Kansas City, and other areas in Missouri; Spire Alabama, serving central and northern Alabama; and the subsidiaries of Spire EnergySouth, serving the Mobile, Alabama area and south-central Mississippi. The Gas Marketing segment includes Spire’s primary gas-related business, Spire Marketing Inc. (“Spire Marketing”), which provides non-regulated natural gas services throughout the United States (U.S.). The Midstream segment includes Spire STL Pipeline and Spire Storage, which are subsidiaries engaged in the transportation and storage of natural gas. The activities of the Company’s other subsidiaries are reported as Other and are described in Note 14, Information by Operating Segment. Spire Missouri and Spire Alabama each have a single reportable segment.

Use of Estimates, Policy [Policy Text Block]

USE OF ESTIMATES – The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

System Of Accounts Policy [Policy Text Block]

SYSTEM OF ACCOUNTS – The accounts of the Utilities are maintained in accordance with the Uniform System of Accounts prescribed by the applicable state public service commissions, which systems substantially conform to that prescribed by the Federal Energy Regulatory Commission (FERC).

Public Utilities, Policy [Policy Text Block]

REGULATED OPERATIONS – The Utilities account for their regulated operations in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 980, Regulated Operations. This topic sets forth the application of GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. The provisions of this accounting guidance require, among other things, that financial statements of a regulated enterprise reflect the actions of regulators, where appropriate. These actions may result in the recognition of revenues and expenses in time periods that are different than non-regulated enterprises. When this occurs, costs are deferred as assets in the balance sheet (regulatory assets) and recorded as expenses when those amounts are reflected in rates. In addition, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for recovery of costs that are expected to be incurred in the future (regulatory liabilities). Management believes that the current regulatory environment supports the continued use of these regulatory accounting principles and that all regulatory assets and regulatory liabilities are recoverable or refundable through the regulatory process. See additional discussion on regulated operations in Note 15, Regulatory Matters.

Property, Plant and Equipment, Policy [Policy Text Block]

PROPERTY, PLANT, AND EQUIPMENT –

Utility Plant – Utility plant is stated at original cost. The cost of additions to utility plant includes contracted work, direct labor and materials, allocable overheads and an allowance for funds used during construction. The costs of units of property retired, replaced or renewed are removed from utility plant and are charged to accumulated depreciation. Maintenance and repairs of property and replacement and renewal of items determined to be less than units of property are charged to maintenance expenses.

Utility plant is depreciated using the composite method on a straight-line basis over the estimated service lives of the various classes of property at rates approved by the applicable regulatory commission. For Spire Missouri and for Spire Alabama, the annual depreciation and amortization expense in fiscal years 2023, 2022 and 2021 averaged approximately 3% of the original cost of depreciable and amortizable property.

Non-utility Property – Non-utility property is recorded at the original cost of acquisition or construction, which includes material, labor, contractor services and, for FERC-regulated projects, an allowance for funds used during construction. Repairs, replacements and renewals of items of property determined to be less than a unit of property or that do not increase the property’s life or functionality are charged to maintenance expense. Upon retirement or sale of non-utility property, the original cost and related accumulated depreciation are removed from the accounts and any gain or loss is included in the income statements. Costs related to software developed or obtained for internal use are capitalized and amortized on a straight-line basis over the estimated useful life of the related software. If software is retired prior to being fully amortized, the difference is recorded as a loss in the income statements.

Accrued Capital Expenditures [Policy Text Block]

Accrued Capital Expenditures – Accrued capital expenditures, shown in the following table, are excluded from capital expenditures in the statements of cash flows until paid.

September 30	2023		2022		2021
Spire	$	104.3	$	77.8	$	59.5
Spire Missouri		56.5		45.6		37.1
Spire Alabama		4.6		19.2		13.6

Asset Retirement Obligation [Policy Text Block]

ASSET RETIREMENT OBLIGATIONS – Spire, Spire Missouri and Spire Alabama record legal obligations associated with the retirement of long-lived assets in the period in which the obligations are incurred, if sufficient information exists to reasonably estimate the fair value of the obligations. Obligations are recorded as both a cost of the related long-lived asset and as a corresponding liability. Subsequently, the asset retirement costs are depreciated over the life of the asset and the asset retirement obligations are accreted to the expected settlement amounts. Spire, Spire Missouri and Spire Alabama record asset retirement obligations associated with certain safety requirements to purge and seal gas distribution mains upon retirement, the plugging and abandonment of storage wells and other storage facilities, specific service line obligations, and certain removal and disposal obligations related to components of Spire Missouri’s, Spire Alabama’s and Spire Gulf’s distribution systems and general plant. Asset retirement obligations recorded by Spire’s other subsidiaries are not material. As authorized by the Missouri Public Service Commission (MoPSC) and the Alabama Public Service Commission (APSC), Spire Missouri, Spire Alabama and Spire Gulf accrue future asset removal costs associated with their property, plant and equipment even if a legal obligation does not exist. Such accruals are provided for through depreciation expense and are recorded with corresponding credits to regulatory liabilities or regulatory assets. When those utilities retire depreciable utility plant and equipment, they charge the associated original costs to accumulated depreciation and amortization, and any related removal costs incurred are charged to regulatory liabilities or regulatory assets. The difference between removal costs recognized in depreciation rates and the accretion expense and depreciation expense recognized for financial reporting purposes is a timing difference between recovery of these costs in rates and their recognition for financial reporting purposes. Accordingly, these differences are deferred as regulatory liabilities or regulatory assets. In the rate setting process, the regulatory liabilities or regulatory assets are excluded from the rate base upon which those utilities have the opportunity to earn their allowed rates of return.

The following table presents a reconciliation of the beginning and ending balances of asset retirement obligations at September 30, as reported in the balance sheets.

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Asset retirement obligations, beginning of year	$	520.9		$	519.6		$	110.6		$	143.4		$	398.7		$	362.8
Liabilities incurred during the period		7.9			3.2			0.9			1.2			2.0			0.5
Liabilities settled during the period		(6.8	)		(9.2	)		(2.5	)		(4.1	)		(2.5	)		(2.0	)
Accretion		21.5			21.1			4.5			5.9			16.5			14.7
Revisions in estimated cash flows		33.9			(13.8	)		(2.4	)		(35.8	)		36.3			22.7
Asset retirement obligations, end of year	$	577.4		$	520.9		$	111.1		$	110.6		$	451.0		$	398.7

Inventory, Policy [Policy Text Block]

NATURAL GAS AND PROPANE GAS – For Spire Missouri’s eastern region, inventory of natural gas in storage is priced on a last in, first out (LIFO) basis and inventory of propane gas in storage is priced on a first in, first out (FIFO) basis. For the rest of the Gas Utility segment, inventory of natural gas in storage is priced on the weighted average cost basis. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2023 was less than the LIFO cost by $21.1. The replacement cost of Spire Missouri’s natural gas for current use in eastern Missouri at September 30, 2022 was more than the LIFO cost by $37.3. The carrying value of the Utilities’ inventory is never adjusted to a lower net realizable value or market value because, pursuant to Purchased Gas Adjustment (PGA) clauses or a Gas Supply Adjustment (GSA) rider, actual gas costs are recovered in customer rates. Natural gas and propane gas storage inventory in Spire’s other operating segments is recorded at the lower of average cost or net realizable value.

Business Combinations and Goodwill [Policy Text Block]

BUSINESS COMBINATIONS AND GOODWILL – Spire’s acquisitions were accounted for using business combination accounting. Under this method, the purchase price paid by the acquirer is allocated to the assets acquired and liabilities assumed as of the acquisition date based on their fair value. Goodwill is measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. At September 30, 2023, goodwill included in Spire’s Gas Utility, Gas Marketing, and Midstream segments was $210.2, zero, and zero, respectively, with the remainder held at the corporate level. Goodwill amounts have not changed since fiscal 2017, and there are no accumulated impairment losses. Spire and Spire Missouri evaluate goodwill for impairment as of July 1 of each year, or more frequently if events and circumstances indicate that goodwill might be impaired. At each test date, the assessments concluded that goodwill was not impaired. The Company updated the assessments as of September 30, 2023, determining that it remained more likely than not that the fair value of each reporting unit exceeded its carrying value.

A subsidiary of Spire in the Midstream segment acquired a natural gas storage facility in northern Oklahoma, now named Spire Storage Salt Plains LLC, on April 1, 2023. The $37 purchase price was fully allocated to the assets acquired and liabilities assumed based on their fair value at the acquisition date, consisting almost entirely of base gas and other property, plant and equipment, resulting in no goodwill.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

IMPAIRMENT OF LONG-LIVED ASSETS – Long-lived assets classified as held and used are evaluated for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. Whether impairment has occurred is determined by comparing the estimated undiscounted cash flows attributable to the assets with the carrying value of the assets. If the carrying value exceeds the undiscounted cash flows, the Company recognizes an impairment charge equal to the amount of the carrying value that exceeds the estimated fair value of the assets. In the period in which the Company determines an asset meets held-for-sale criteria, an impairment charge is recorded to the extent the book value exceeds its fair value less cost to sell.

Derivatives, Policy [Policy Text Block]

DERIVATIVES – In the course of their business, certain subsidiaries of Spire enter into commitments associated with the purchase or sale of natural gas. Certain of their derivative natural gas contracts are designated as normal purchases or normal sales and, as such, are excluded from the scope of FASB ASC Topic 815, Derivatives and Hedging. Those contracts are accounted for as executory contracts and recorded on an accrual basis. Revenues and expenses from such contracts are recorded gross. Contracts not designated as normal purchases or normal sales are recorded as derivatives with changes in fair value recognized in earnings in the periods prior to physical delivery. Certain of Spire Marketing’s wholesale purchase and sale transactions are classified as trading activities for financial reporting purposes, with income and expenses presented on a net basis in natural gas expenses in the Consolidated Statements of Income. Spire also enters into cash flow hedges through execution of interest rate swap contracts to protect itself against adverse movements in interest rates. Refer to Note 10, Derivative Instruments and Hedging Activities, for more information about derivatives.

Income Tax, Policy [Policy Text Block]

INCOME TAXES – Spire and its subsidiaries account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and the respective tax basis and for tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be realized or settled. The effects on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income or loss for non-regulated operations, and in a regulatory asset or regulatory liability for regulated operations. A valuation allowance is established when it is more likely than not that some portion or all of the deferred tax assets will not be realized.

The Company accounts for uncertain tax positions in accordance with authoritative guidance. The authoritative guidance addresses the determination of whether tax benefits claimed, or expected to be claimed, on a tax return should be recorded in the financial statements. Spire may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the position will be sustained upon examination by the taxing authority, based on the technical merits of the position. Tax-related interest and penalties, if any, are classified as a liability on the balance sheets. For additional information on the accounting for income taxes, refer to Note 12, Income Taxes.

Cash and Cash Equivalents, Policy [Policy Text Block]

CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – All highly liquid debt instruments purchased with original maturities of three months or less are considered to be cash equivalents. Such instruments are carried at cost, which approximates market value. Outstanding checks on the Company’s and Utilities’ bank accounts in excess of funds on deposit create book overdrafts (which are funded at the time checks are presented for payment) and are classified as Other in the Current Liabilities section of the balance sheets. Changes in book overdrafts are reflected as Operating Activities in the statements of cash flows. In Spire’s statements of cash flows, total Cash, Cash Equivalents, and Restricted Cash included $20.2 and $14.0 of restricted cash reported in “Other Investments” on the Company’s balance sheet as of September 30, 2023 and 2022, respectively (in addition to amounts shown as “Cash and cash equivalents”). This restricted cash has been segregated and invested in debt securities in a trust account based on collateral requirements for reinsurance at Spire’s risk management company.

Accounts Receivable [Policy Text Block]

NATURAL GAS RECEIVABLE – Spire Marketing enters into natural gas transactions with natural gas pipeline and storage companies known as park and loan arrangements. Under the terms of the arrangements, Spire Marketing purchases natural gas from a third party and delivers that natural gas to the pipeline or storage company for the right to receive the same quantity of natural gas from that company at the same location in a future period. These arrangements are accounted for as non-monetary transactions under GAAP and are recorded at the carrying amount. As such, natural gas receivables are reflected in “Other” current assets on the Consolidated Balance Sheets at cost, which includes related fees associated with the transactions. In the period that the natural gas is returned to Spire Marketing, concurrent with the sale of the natural gas to a third party, the related natural gas receivable is expensed in the Consolidated Statements of Income. In conjunction with these transactions, Spire Marketing usually enters into New York Mercantile Exchange (NYMEX) and Intercontinental Exchange (ICE) natural gas futures, options, and swap contracts or fixed price sales agreements to protect against market changes in future sales prices.

Earnings Per Share, Policy [Policy Text Block]

EARNINGS PER COMMON SHARE – GAAP requires dual presentation of basic and diluted earnings per share (EPS). EPS is computed using the two-class method, which is an earnings allocation method for computing EPS that treats a participating security as having rights to earnings that would otherwise have been available to common shareholders. Certain of the Company’s stock-based compensation awards pay non-forfeitable dividends to the participants during the vesting period and, as such, are deemed participating securities. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding that are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common shares, pursuant to the treasury stock method. Shares attributable to equity units, non-participating performance-contingent restricted stock awards, and time-vested restricted stock/units are excluded from the calculation of diluted earnings per share if the effect would be antidilutive. Shares attributable to non-participating performance-contingent restricted stock awards are only included in the calculation of diluted earnings per share to the extent the underlying performance and/or market conditions are satisfied (a) prior to the end of the reporting period or (b) would be satisfied if the end of the reporting period were the end of the related contingency period and the result would be dilutive. The Company’s EPS computations are presented in Note 4, Earnings Per Common Share.

Transactions With Affiliates [Policy Text Block]

TRANSACTIONS WITH AFFILIATES – Transactions between affiliates of the Company have been eliminated from the consolidated financial statements of Spire. Spire Missouri and Spire Alabama borrowed funds from the Company and incurred related interest, as reflected in their separate financial statements, and they participated in normal intercompany shared services transactions. In addition, Spire Missouri’s and Spire Alabama’s other transactions with affiliates included: 

	Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021
Natural gas purchases from Spire Marketing	$	57.4	$	86.3	$	92.5	$	4.7	$	3.2	$	10.4
Natural gas sales to Spire Marketing		0.4		—		1.1		—		0.5		0.1
Transportation services from Spire STL Pipeline LLC		32.0		32.0		32.0		—		—		—
Natural gas storage services from Spire Storage Salt Plains LLC		0.7		—		—		—		—		—
Transportation services from Spire NGL Inc.		—		—		0.5		—		—		—

Receivable [Policy Text Block]

ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES – Trade accounts receivable are recorded at the amounts due from customers, including unbilled amounts. Accounts receivable are written off when they are deemed to be uncollectible. An allowance for expected credit losses is estimated and updated based on relevant data and trends such as accounts receivable aging, historical write-off experience, current write-off trends, economic conditions, and the impact of weather and availability of customer payment assistance on collection trends. For the Utilities, net write-offs as a percentage of revenue has historically been the best predictor of base net write-off experience over time. Management judgment is applied in the development of the allowance due to the complexity of variables and subjective nature of certain relevant factors. The accounts receivable of Spire’s non-utility businesses are evaluated separately from those of the Utilities. The allowance for credit losses for those other businesses is based on a continuous evaluation of the individual counterparty risk and is not significant for the periods presented. Activity in the allowance for credit losses is shown in the following table.

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Allowance at beginning of year	$	31.9		$	30.3		$	24.9		$	24.9		$	22.6		$	18.1		$	6.3		$	6.6		$	5.5
Provision for expected credit losses		16.6			11.6			14.7			13.3			11.2			11.1			2.6			0.3			3.1
Write-offs, net of recoveries		(16.0	)		(10.0	)		(9.3	)		(12.0	)		(8.9	)		(6.6	)		(3.2	)		(0.6	)		(2.0	)
Allowance at end of year	$	32.5		$	31.9		$	30.3		$	26.2		$	24.9		$	22.6		$	5.7		$	6.3		$	6.6

FINANCE RECEIVABLES – Spire Alabama finances third party contractor sales of merchandise including gas furnaces and appliances. At September 30, 2023 and 2022, Spire Alabama’s finance receivable totaled approximately $6.7 and $7.1, respectively. Financing is available only to qualified customers who meet creditworthiness thresholds for customer payment history and external agency credit reports. Spire Alabama relies upon ongoing payments as the primary indicator of credit quality during the term of each contract. The allowance for credit losses is recognized using an estimate of write-off percentages based on historical experience. Delinquent accounts are evaluated on a case-by-case basis and, absent evidence of debt repayment, after 90 days are due in full and assigned to a third-party collection agency. The remaining finance receivable is written off approximately 12 months after being assigned to the third-party collection agency. Spire Alabama had finance receivables past due 90 days or more of $0.3 at September 30, 2023 and 2022.

Liability Reserve Estimate, Policy [Policy Text Block]

GROUP MEDICAL AND WORKERS’ COMPENSATION RESERVES – The Company self-insures its group medical and workers’ compensation costs and carries stop-loss coverage in relation to medical claims and workers’ compensation claims. Reserves for amounts incurred but not reported are established based on historical cost levels and lags between occurrences and reporting.

Fair Value of Financial Instruments, Policy [Policy Text Block]

FAIR VALUE MEASUREMENTS – Certain assets and liabilities are recognized or disclosed at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). GAAP establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.

The levels of the hierarchy are described below:

• Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.

• Level 2 – Pricing inputs other than quoted prices included within Level 1, which are either directly or indirectly observable for the asset or liability as of the reporting date. These inputs are derived principally from, or corroborated by, observable market data.

• Level 3 – Pricing that is based upon inputs that are generally unobservable that are based on the best information available and reflect management’s assumptions about how market participants would price the asset or liability.

Assessment of the significance of a particular input to the fair value measurements may require judgment and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. Additional information about fair value measurements is provided in Note 8, Fair Value of Financial Instruments, Note 9, Fair Value Measurements, and Note 13, Pension Plans and Other Postretirement Benefits.

Share-Based Payment Arrangement [Policy Text Block]

STOCK-BASED COMPENSATION – The Company accounts for share-based compensation arrangements in accordance with ASC Topic 718, Compensation - Stock Compensation. The Company measures stock-based compensation awards at fair value at the date of grant and recognizes the compensation cost of the awards over the requisite service period. Forfeitures are recognized in the period they occur. Refer to Note 3, Stock-Based Compensation, for further discussion of the accounting for the Company’s stock-based compensation plans.

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Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block]

September 30	2023		2022		2021
Spire	$	104.3	$	77.8	$	59.5
Spire Missouri		56.5		45.6		37.1
Spire Alabama		4.6		19.2		13.6

Schedule of Asset Retirement Obligations [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Asset retirement obligations, beginning of year	$	520.9		$	519.6		$	110.6		$	143.4		$	398.7		$	362.8
Liabilities incurred during the period		7.9			3.2			0.9			1.2			2.0			0.5
Liabilities settled during the period		(6.8	)		(9.2	)		(2.5	)		(4.1	)		(2.5	)		(2.0	)
Accretion		21.5			21.1			4.5			5.9			16.5			14.7
Revisions in estimated cash flows		33.9			(13.8	)		(2.4	)		(35.8	)		36.3			22.7
Asset retirement obligations, end of year	$	577.4		$	520.9		$	111.1		$	110.6		$	451.0		$	398.7

Schedule of Related Party Transactions [Table Text Block]

	Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021
Natural gas purchases from Spire Marketing	$	57.4	$	86.3	$	92.5	$	4.7	$	3.2	$	10.4
Natural gas sales to Spire Marketing		0.4		—		1.1		—		0.5		0.1
Transportation services from Spire STL Pipeline LLC		32.0		32.0		32.0		—		—		—
Natural gas storage services from Spire Storage Salt Plains LLC		0.7		—		—		—		—		—
Transportation services from Spire NGL Inc.		—		—		0.5		—		—		—

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Allowance at beginning of year	$	31.9		$	30.3		$	24.9		$	24.9		$	22.6		$	18.1		$	6.3		$	6.6		$	5.5
Provision for expected credit losses		16.6			11.6			14.7			13.3			11.2			11.1			2.6			0.3			3.1
Write-offs, net of recoveries		(16.0	)		(10.0	)		(9.3	)		(12.0	)		(8.9	)		(6.6	)		(3.2	)		(0.6	)		(2.0	)
Allowance at end of year	$	32.5		$	31.9		$	30.3		$	26.2		$	24.9		$	22.6		$	5.7		$	6.3		$	6.6

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Note 2 - Revenue (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	2023			2022			2021
Spire
Gas Utility:
Residential	$	1,648.5		$	1,416.6		$	1,234.0
Commercial & industrial		606.0			338.9			586.0
Transportation		121.6			118.0			122.9
Off-system & other incentive		30.0			42.0			152.7
Other customer revenue		16.1			19.9			22.2
Total revenue from contracts with customers		2,422.2			1,935.4			2,117.8
Changes in accrued revenue under alternative revenue programs		34.7			10.7			1.5
Total Gas Utility operating revenues		2,456.9			1,946.1			2,119.3
Gas Marketing		179.1			234.9			96.5
Midstream		66.1			53.1			52.6
Other		16.7			16.1			15.1
Total before eliminations		2,718.8			2,250.2			2,283.5
Intersegment eliminations (see Note 14, Information by Operating Segment)		(52.5	)		(51.7	)		(48.0	)
Total Operating Revenues	$	2,666.3		$	2,198.5		$	2,235.5
Spire Missouri
Residential	$	1,261.3		$	1,061.4		$	882.1
Commercial & industrial		411.9			177.2			436.1
Transportation		33.2			33.3			33.5
Off-system & other incentive		20.1			25.2			145.6
Other customer revenue		12.5			11.1			16.3
Total revenue from contracts with customers		1,739.0			1,308.2			1,513.6
Changes in accrued revenue under alternative revenue programs		23.9			12.8			3.0
Total Operating Revenues	$	1,762.9		$	1,321.0		$	1,516.6
Spire Alabama
Residential	$	322.9		$	291.6		$	288.0
Commercial & industrial		150.4			119.1			114.9
Transportation		77.6			74.4			78.7
Off-system & other incentive		9.9			16.8			7.1
Other customer revenue		3.6			5.5			1.9
Total revenue from contracts with customers		564.4			507.4			490.6
Changes in accrued revenue under alternative revenue programs		6.7			1.7			3.4
Total Operating Revenues	$	571.1		$	509.1		$	494.0

Schedule Of Taxes On Revenues [Table Text Block]

	2023		2022		2021
Spire	$	131.8	$	109.8	$	94.0
Spire Missouri		96.7		79.6		64.3
Spire Alabama		29.9		25.5		25.1

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Note 3 - Stock-based Compensation (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				Weighted
				Average
				Grant Date
				Fair Value
	Units			Per Unit
Non-vested at September 30, 2022		343,524		$	70.14
Granted		116,390		$	79.88
Adjusted for performance		(13,459	)	$	76.91
Vested		(74,556	)	$	76.91
Forfeited		(23,546	)	$	71.73
Non-vested at September 30, 2023		348,353		$	71.76

				Weighted
				Average
				Grant Date
	Shares/			Fair Value
	Units			Per Share
Non-vested at September 30, 2022		122,245		$	66.60
Granted		68,244		$	72.60
Vested		(59,040	)	$	75.27
Forfeited		(8,460	)	$	65.36
Non-vested at September 30, 2023		122,989		$	65.85

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2023		2022		2021
Risk-free interest rate		4.26%		0.79%		0.22%
Expected dividend yield of stock		—		—		—
Expected volatility of stock		33.8%		32.2%		31.4%
Performance period (in years)		3.0		3.0		3.0

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	2023			2022			2021
Total compensation cost	$	11.2		$	7.5		$	16.6
Compensation cost capitalized		(1.4	)		(1.1	)		(2.7	)
Compensation cost recognized in net income		9.8			6.4			13.9
Income tax benefit recognized in net income		(2.2	)		(1.5	)		(3.2	)
Compensation cost recognized in net income, net of income tax	$	7.6		$	4.9		$	10.7

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Note 4 - Earnings Per Common Share (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		2023		2022		2021
Basic Earnings Per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Basic Earnings Per Share of Common Stock		$	3.86	$	3.96	$	4.97
Diluted Earnings per Common Share:
Net Income		$	217.5	$	220.8	$	271.7
Less:	Provision for preferred dividends		14.8		14.8		14.8
	Income allocated to participating securities		0.3		0.3		0.4
Net Income Available to Common Shareholders		$	202.4	$	205.7	$	256.5
Weighted Average Common Shares Outstanding (in millions)			52.5		52.0		51.6
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)*			0.1		0.1		0.1
Weighted Average Diluted Common Shares (in millions)			52.6		52.1		51.7
Diluted Earnings Per Share of Common Stock		$	3.85	$	3.95	$	4.96
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to common stock forward contracts, stock units subject to performance or market conditions, and restricted stock, which could have a dilutive effect in the future			1.9		0.1		0.1

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Note 5 - Shareholders' Equity (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Stock Purchase Contract Obligation, Number of Shares to be Purchased [Table Text Block]

If the applicable market value* per share	Number of shares to be purchased per
of Spire common stock is:	stock purchase contract is:
Equal to or greater than $78.6906 (“threshold appreciation price”)	0.6354 (“minimum settlement rate”)
Less than $78.6906, but greater than $64.24	$50.00 ÷ applicable market value*
Less than or equal to $64.24 (“reference price”)	0.7783 (“maximum settlement rate”)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Net		Defined Benefit			Net Unrealized
	Unrealized		Pension and			Gain (Loss) on
	Gain (Loss)		Other			Available-for-
	on Cash Flow		Postretirement			Sale Debt
	Hedges		Benefit Plans			Securities			Total
Spire
Balance at September 30, 2021	$	7.9	$	(4.2	)	$	(0.1	)	$	3.6
Other comprehensive income (loss)		42.5		1.5			(0.4	)		43.6
Balance at September 30, 2022		50.4		(2.7	)		(0.5	)		47.2
Other comprehensive income		0.1		0.2			0.1			0.4
Balance at September 30, 2023	$	50.5	$	(2.5	)	$	(0.4	)	$	47.6
Spire Missouri
Balance at September 30, 2021	$	—	$	(4.2	)	$	—		$	(4.2	)
Other comprehensive income		—		1.5			—			1.5
Balance at September 30, 2022		—		(2.7	)		—			(2.7	)
Other comprehensive income		—		0.2			—			0.2
Balance at September 30, 2023	$	—	$	(2.5	)	$	—		$	(2.5	)

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Note 6 - Long-term Debt (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Long-Term Debt Instruments [Table Text Block]

	2023			2022
Spire
3.31% Notes Payable, due December 15, 2022	$	—		$	25.0
3.54% Senior Notes, due February 27, 2024		150.0			150.0
0.75% Remarketable Senior Notes, due March 1, 2026		175.0			175.0
3.13% Senior Notes, due September 1, 2026		130.0			130.0
3.93% Senior Notes, due March 15, 2027		100.0			100.0
5.80% Senior Notes, due March 15, 2033		150.0			—
4.70% Senior Notes, due August 15, 2044		250.0			250.0
Total principal of Spire Missouri long-term debt (see below)		1,798.0			1,648.0
Total principal of Spire Alabama long-term debt (see below)		750.0			575.0
Other subsidiaries' long-term debt:
5.00% First Mortgage Bonds, due September 30, 2031		42.0			42.0
2.95% Notes, with annual principal payments through December 2034		117.7			123.9
5.61% First Mortgage Bonds, due October 15, 2037		30.0			—
3.52% First Mortgage Bonds, due September 30, 2049		40.0			40.0
Total principal of long-term debt		3,732.7			3,258.9
Less: Unamortized discounts and debt issuance costs		(22.1	)		(19.2	)
Less: Current portion		(156.6	)		(281.2	)
Long-term debt, excluding current portion	$	3,554.0		$	2,958.5
Spire Missouri
First Mortgage Bonds:
3.40% Series, due August 15, 2023	$	—		$	250.0
Floating Rate Series, due December 2, 2024		300.0			300.0
3.40% Series, due March 15, 2028		45.0			45.0
7.00% Series, due June 1, 2029	19.3			19.3
2.84% Series, due November 15, 2029		275.0			275.0
7.90% Series, due September 15, 2030		30.0			30.0
3.68% Series, due September 15, 2032		50.0			50.0
4.80% Series, due February 15, 2033		400.0			—
6.00% Series, due May 1, 2034		99.3			99.3
6.15% Series, due June 1, 2036		54.5			54.5
4.63% Series, due August 15, 2043		99.9			99.9
4.23% Series, due September 15, 2047		70.0			70.0
3.30% Series, due June 1, 2051		305.0			305.0
4.38% Series, due September 15, 2057		50.0			50.0
Total principal of Spire Missouri long-term debt		1,798.0			1,648.0
Less: Unamortized discounts and debt issuance costs		(12.6	)		(10.3	)
Less: Current portion		—			(250.0	)
Spire Missouri long-term debt, excluding current portion	$	1,785.4		$	1,387.7
Spire Alabama
3.21% Notes, due September 15, 2025	$	35.0		$	35.0
5.32% Notes, due October 15, 2029		90.0			—
2.88% Notes, due December 1, 2029		100.0			100.0
2.04% Notes, due December 15, 2030		150.0			150.0
5.41% Notes, due October 15, 2032		85.0			—
5.90% Notes, due January 15, 2037		45.0			45.0
4.31% Notes, due December 1, 2045		80.0			80.0
3.92% Notes, due January 15, 2048		45.0			45.0
4.64% Notes, due January 15, 2049		90.0			90.0
4.02% Notes, due January 15, 2058		30.0			30.0
Total principal of Spire Alabama long-term debt		750.0			575.0
Less: Unamortized discounts and debt issuance costs		(4.1	)		(3.5	)
Spire Alabama long-term debt, excluding current portion	$	745.9		$	571.5

Schedule of Maturities of Long-Term Debt [Table Text Block]

	2024		2025		2026		2027		2028
Spire	$	156.6	$	342.0	$	312.5	$	108.1	$	53.6
Spire Missouri		—		300.0		—		—		45.0
Spire Alabama		—		35.0		—		—		—

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Note 7 - Notes Payable and Credit Agreements (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Short-Term Debt [Table Text Block]

	Spire			Spire						Spire
	(Parent Only)			Missouri						Alabama			Spire
	CP			Term			Spire			Spire			Consol-
	Program			Loan			Note			Note			idated
Year Ended September 30, 2023
Highest borrowings outstanding	$	1,282.0		$	250.0		$	656.9		$	274.0		$	1,482.0
Lowest borrowings outstanding		354.4			—			3.8			76.7			489.0
Weighted average borrowings		776.3			66.8			327.9			119.1			843.1
Weighted average interest rate		5.0	%		5.5	%		4.9	%		4.9	%		5.0	%
As of September 30, 2023
Borrowings outstanding	$	955.5		$	—		$	540.6		$	124.1		$	955.5
Weighted average interest rate		5.6	%		0.0	%		5.6	%		5.6	%		5.6	%
As of September 30, 2022
Borrowings outstanding	$	1,037.5		$	—		$	445.3		$	260.9		$	1,037.5
Weighted average interest rate		3.3	%		0.0	%		3.3	%		3.3	%		3.3	%

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Note 8 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

					Classification of
					Estimated Fair Value
					Quoted
					Prices in		Significant
					Active		Observable
	Carrying		Fair		Markets		Inputs
	Amount		Value		(Level 1)		(Level 2)
Spire
As of September 30, 2023
Cash and cash equivalents	$	5.6	$	5.6	$	5.6	$	—
Notes payable		955.5		955.5		—		955.5
Long-term debt, including current portion		3,710.6		3,270.2		—		3,270.2
As of September 30, 2022
Cash and cash equivalents	$	6.5	$	6.5	$	6.5	$	—
Notes payable		1,037.5		1,037.5		—		1,037.5
Long-term debt, including current portion		3,239.7		2,851.8		—		2,851.8
Spire Missouri
As of September 30, 2023
Cash and cash equivalents	$	0.8	$	0.8	$	0.8	$	—
Notes payable - associated companies		540.6		540.6		—		540.6
Long-term debt		1,785.4		1,592.4		—		1,592.4
As of September 30, 2022
Notes payable - associated companies	$	445.3	$	445.3	$	—	$	445.3
Long-term debt, including current portion		1,637.7		1,473.9		—		1,473.9
Spire Alabama
As of September 30, 2023
Cash and cash equivalents	$	1.2	$	1.2	$	1.2	$	—
Notes payable - associated companies		124.1		124.1		—		124.1
Long-term debt		745.9		648.0		—		648.0
As of September 30, 2022
Cash and cash equivalents	$	2.4	$	2.4	$	2.4	$	—
Notes payable - associated companies		260.9		260.9		—		260.9
Long-term debt		571.5		485.0		—		485.0

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Note 9 - Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		10.1		—		—		(10.1	)		—
Natural gas commodity contracts		—		36.7		—		(3.6	)		33.1
Other:
U.S. stock/bond mutual funds		37.6		—		—		—			37.6
Interest rate swaps		—		44.2		—		—			44.2
Total	$	74.4	$	81.0	$	—	$	(20.1	)	$	135.3
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
Gas Marketing:
NYMEX/ICE natural gas contracts		21.8		—		—		(21.8	)		—
Natural gas commodity contracts		—		27.6		—		(3.6	)		24.0
Total	$	72.6	$	27.6	$	—	$	(69.4	)	$	30.8
As of September 30, 2022
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		91.8		—		—		(91.8	)		—
Natural gas commodity contracts *		—		56.6		—		(4.0	)		52.6
Other:
U.S. stock/bond mutual funds		29.3		—		—		—			29.3
Interest rate swaps *		—		63.6		—		—			63.6
Total	$	198.0	$	120.2	$	—	$	(153.6	)	$	164.6
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—
Gas Marketing:
NYMEX/ICE natural gas contracts		82.3		—		—		(82.3	)		—
Natural gas commodity contracts *		—		65.5		—		(4.0	)		61.5
Total	$	113.0	$	65.5	$	—	$	(117.0	)	$	61.5

							Effects of
	Quoted						Netting
	Prices		Significant		Significant		and Cash
	in Active		Observable		Unobservable		Margin
	Markets		Inputs		Inputs		Receivables
	(Level 1)		(Level 2)		(Level 3)		/Payables			Total
As of September 30, 2023
ASSETS
U.S. stock/bond mutual funds	$	20.4	$	—	$	—	$	—		$	20.4
Gasoline and heating oil contracts		—		0.1		—		(0.1	)		—
NYMEX/ICE natural gas contracts		6.3		—		—		(6.3	)		—
Total	$	26.7	$	0.1	$	—	$	(6.4	)	$	20.4
LIABILITIES
NYMEX/ICE natural gas contracts	$	50.8	$	—	$	—	$	(44.0	)	$	6.8
As of September 30, 2022
ASSETS
U.S. stock/bond mutual funds	$	19.1	$	—	$	—	$	—		$	19.1
NYMEX/ICE natural gas contracts		57.8		—		—		(57.8	)		—
Total	$	76.9	$	—	$	—	$	(57.8	)	$	19.1
LIABILITIES
NYMEX/ICE natural gas contracts	$	30.7	$	—	$	—	$	(30.7	)	$	—

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Note 10 - Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Derivative Instruments [Table Text Block]

	September 30, 2023		September 30, 2022
Gas Marketing	Notional (MMBtu millions)	Maximum Term (Months)	Notional (MMBtu millions)	Maximum Term (Months)
Natural gas futures purchased	61.3	51	76.3	54
Natural gas options purchased, net	4.9	15	3.7	12
Natural gas basis swaps purchased	44.1	51	61.7	39
Gas Utility
Natural gas futures purchased	66.5	24	13.0	12

	September 30, 2023				September 30, 2022
	Notional (MMBtu millions)		Maximum Term (Months)		Notional (MMBtu millions)		Maximum Term (Months)
Natural gas futures purchased		66.5		24		13.0		12

Derivative Instruments, Gain (Loss) [Table Text Block]

Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income
	Location of Gain (Loss)
	Recorded in Income	2023			2022			2021
Derivatives in Cash Flow Hedging Relationships
Effective portion of gain recognized in OCI on derivatives:
Interest rate swaps		$	20.1		$	56.7		$	61.2
Effective portion of gain reclassified from AOCI to income:
Interest rate swaps	Interest Expense	$	(2.4	)	$	(1.2	)	$	(1.3	)
Derivatives Not Designated as Hedging Instruments*
Gain (Loss) recognized in income on derivatives:
Gas / diesel futures	Non-Operating Expense: Other Income	$	0.3		$	—		$	—
Natural gas commodity contracts	Operating Expenses: Natural Gas		18.0			52.6			54.1
NYMEX / ICE natural gas contracts	Operating Expenses: Natural Gas		(35.0	)		43.3			(77.5	)
Total		$	(16.7	)	$	95.9		$	(23.4	)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair Value of Derivative Instruments in the Consolidated Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	44.2	Current Liabilities: Other	$	—
Subtotal			44.2			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		6.3	Current Liabilities: Other		50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1			—
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other		8.0	Current Liabilities: Other		16.0
	Deferred Charges and Other Assets: Other		2.1	Deferred Credits and Other Liabilities: Other		5.7
Natural gas commodity	Current Assets: Other		31.2	Current Liabilities: Other		20.1
	Deferred Charges and Other Assets: Other		5.5	Deferred Credits and Other Liabilities: Other		7.6
Subtotal			53.2			100.2
Total derivatives		$	97.4		$	100.2
September 30, 2022
Derivatives designated as hedging instruments
Other: Interest rate swaps	Current Assets: Other	$	63.6	Current Liabilities: Other	$	—
Subtotal			63.6			—
Derivatives not designated as hedging instruments
Gas Utility:
Natural gas contracts	Current Assets: Other		57.8	Current Liabilities: Other		30.7
Gas Marketing:
NYMEX / ICE natural gas contracts	Current Assets: Other	79.2		Current Liabilities: Other		71.5
	Deferred Charges and Other Assets: Other		12.7	Deferred Credits and Other Liabilities: Other		10.8
Natural gas commodity	Current Assets: Other		53.4	Current Liabilities: Other		55.1
	Deferred Charges and Other Assets: Other		3.1	Deferred Credits and Other Liabilities: Other		10.4
Subtotal			206.2			178.5
Total derivatives		$	269.8		$	178.5

Fair Value of Derivative Instruments in the Balance Sheets
	Derivative Assets*			Derivative Liabilities*
September 30, 2023	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	6.3	Current Liabilities: Other	$	50.8
Gasoline and heating oil contracts	Current Assets: Other		0.1
Total derivatives		$	6.4		$	50.8
September 30, 2022
Derivatives not designated as hedging instruments
Natural gas contracts	Current Assets: Other	$	57.8	Current Liabilities: Other	$	30.7

Derivative Instrument Reconciliation [Table Text Block]

	2023			2022
Fair value of derivative assets presented above	$	97.4		$	269.8
Fair value of cash margin receivable offset with derivatives		49.3			(36.6	)
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	77.3		$	116.2
Derivative Instrument Assets, per Consolidated Balance Sheets:
Current Assets: Other	$	71.8		$	113.1
Deferred Charges and Other Assets: Other		5.5			3.1
Total	$	77.3		$	116.2
Fair value of derivative liabilities presented above	$	100.2		$	178.5
Netting of assets and liabilities with the same counterparty		(69.4	)		(117.0	)
Total	$	30.8		$	61.5
Derivative Instrument Liabilities, per Consolidated Balance Sheets:
Current Liabilities: Other	$	23.2		$	51.1
Deferred Credits and Other Liabilities: Other		7.6			10.4
Total	$	30.8		$	61.5

	2023			2022
Fair value of derivative assets presented above	$	6.4		$	57.8
Fair value of cash margin (payable) receivable offset with derivatives		37.6			(27.1	)
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	—		$	—
Fair value of derivative liabilities presented above	$	50.8		$	30.7
Netting of assets and liabilities with the same counterparty		(44.0	)		(30.7	)
Total	$	6.8		$	—
Derivative Instrument Liabilities, per Balance Sheets:
Derivative instrument liabilities	$	6.8		$	—
Total	$	6.8		$	—

Interest Rate Swap [Member]

Notes Tables

Schedule of Derivative Instruments [Table Text Block]

Period Originated	Contract Hedge Term (Years)		Notional Amount		Fixed Interest Rate			Fiscal 2023 Mark-to-Market Gain
Quarter 1, fiscal 2022		10	$	50.0		1.4918	%	$	2.7
Quarter 2, fiscal 2022		10		75.0		1.6475	%		4.0
Quarter 2, fiscal 2022		10		25.0		1.7460	%		1.5
Quarter 1, fiscal 2023		10		50.0		3.4480	%		2.4
Quarter 2, fiscal 2023		10		50.0		3.6850	%		0.9
Quarter 2, fiscal 2023		10		25.0		3.5350	%		0.5
Quarter 2, fiscal 2023		10		25.0		3.3850	%		0.6
Quarter 3, fiscal 2023		30		50.0		2.7470	%		7.8
Quarter 3, fiscal 2023		10		25.0		2.9020	%		2.2
Quarter 3, fiscal 2023		10		25.0		3.0180	%		2.0
			$	400.0				$	24.6

XML

Note 12 - Income Taxes (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023		2022		2021
Federal:
Current	$	0.7		$	0.5		$	0.2		$	—		$	—		$	—		$	—	$	—	$	—
Deferred		30.4			47.0			49.5			10.1			18.2			22.0			15.8		18.1		19.8
Investment tax credits		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		(0.2	)		—		—		—
State and local:
Current		1.2			0.5			1.3			—			—			—			—		—		—
Deferred		6.7			11.1			17.7			1.7			3.3			3.5			4.5		5.1		5.2
Total income tax expense	$	38.8		$	58.9		$	68.5		$	11.6		$	21.3		$	25.3		$	20.3	$	23.2	$	25.0

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Federal income tax statutory rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
State and local income taxes, net of federal income tax benefits		3.7			3.6			3.6			2.6			2.6			2.6			4.1			4.1			4.1
Certain expenses capitalized on books and deducted on tax return		(1.4	)		(1.6	)		(1.6	)		(2.7	)		(3.2	)		(3.3	)		—			—			—
Taxes related to prior years		—			(0.3	)		(0.5	)					(0.6	)		(0.2	)		—			—			—
Tax credits *		(3.3	)		—			—			(4.2	)		—			—			(1.9	)		—			—
Amortization of excess deferred taxes		(5.1	)		(3.5	)		(2.5	)		(7.7	)		(7.3	)		(5.0	)		0.2			—			—
Other items – net **		0.2			1.9			0.1			—			3.1			(0.2	)		0.1			0.2			0.2
Effective income tax rate		15.1	%		21.1	%		20.1	%		9.0	%		15.6	%		14.9	%		23.5	%		25.3	%		25.3	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Deferred tax assets:
Reserves not currently deductible	$	27.7		$	33.5		$	—		$	4.0		$	3.9		$	7.4
Pension and other postretirement benefits		64.4			72.6			44.7			52.6			17.0			—
Goodwill		—			—			—			—			58.8			73.0
Operating losses		239.2			255.1			89.2			116.9			159.8			140.3
Regulatory amount due to customers, net		30.4			34.5			27.6			30.7			—			—
Other		35.8			24.9			10.5			—			3.0			—
Total deferred tax assets		397.5			420.6			172.0			204.2			242.5			220.7
Deferred tax liabilities:
Relating to property		(788.0	)		(740.0	)		(507.7	)		(489.3	)		(218.7	)		(201.6	)
Regulatory pension and other postretirement benefits		(80.6	)		(92.8	)		(53.0	)		(72.3	)		(25.9	)		(1.6	)
Deferred gas costs		(67.0	)		(75.8	)		(64.1	)		(74.0	)		—			—
Other ***		(205.6	)		(187.1	)		(79.0	)		(68.7	)		(7.0	)		(6.5	)
Total deferred tax liabilities		(1,141.2	)		(1,095.7	)		(703.8	)		(704.3	)		(251.6	)		(209.7	)
Net deferred tax (liability) asset	$	(743.7	)	$	(675.1	)	$	(531.8	)	$	(500.1	)	$	(9.1	)	$	11.0

Summary of Federal and State Loss and Contribution and Tax Credit Carryforwards[Table Text Block]

	Spire		Spire Missouri		Spire Alabama
Federal and state loss carryforwards	$	1,000.3	$	352.4	$	624.1
Contribution carryforwards		6.1		5.6		-
Tax credit carryforwards		13.1		8.5		1.6

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Spire							Spire Missouri						Spire Alabama
	2023		2022			2021		2023		2022		2021		2023		2022		2021
Unrecognized tax benefits, beginning of year	$	19.6	$	16.4		$	13.2	$	19.3	$	16.1	$	13.0	$	—	$	—	$	—
Increases related to tax positions taken in current year		4.2		3.3			3.2		3.6		3.2		3.1		0.3		—		—
Reductions due to lapse of applicable statute of limitations		—		(0.1	)		—		—		—		—		—		—		—
Unrecognized tax benefits, end of year	$	23.8	$	19.6		$	16.4	$	22.9	$	19.3	$	16.1	$	0.3	$	—	$	—

XML

Note 13 - Pension Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	16.3		$	20.0		$	21.7		$	11.4		$	14.4		$	15.4		$	4.2		$	4.8		$	5.5
Interest cost on projected benefit obligation		25.1			21.5			20.7			17.8			14.7			14.2			4.8			4.7			4.6
Expected return on plan assets		(24.5	)		(31.3	)		(31.6	)		(18.0	)		(22.7	)		(22.5	)		(3.5	)		(5.2	)		(5.8	)
Amortization of prior service credit		(4.5	)		(4.5	)		(3.1	)		(1.9	)		(1.9	)		(0.6	)		(2.4	)		(2.4	)		(2.3	)
Amortization of actuarial loss		6.6			11.9			14.9			6.1			9.6			11.0			0.9			2.4			3.9
Loss on lump-sum settlements and curtailments		9.7			33.6			18.2			0.6			27.3			11.6			9.1			6.3			6.6
Subtotal		28.7			51.2			40.8			16.0			41.4			29.1			13.1			10.6			12.5
Regulatory adjustment		26.3			12.5			20.6			27.1			9.9			19.0			(1.7	)		1.7			0.7
Net pension cost	$	55.0		$	63.7		$	61.4		$	43.1		$	51.3		$	48.1		$	11.4		$	12.3		$	13.2

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Service cost – benefits earned during the period	$	4.8		$	7.5		$	7.3		$	4.0		$	6.3		$	6.2		$	0.7		$	1.1		$	0.9
Interest cost on accumulated postretirement benefit obligation		8.5			6.0			6.0			6.5			4.5			4.5			1.8			1.4			1.3
Expected return on plan assets		(15.8	)		(16.8	)		(16.1	)		(10.5	)		(11.3	)		(10.9	)		(5.0	)		(5.2	)		(4.9	)
Amortization of prior service cost (credit)		0.3			1.0			1.0			0.6			0.7			0.7			(0.3	)		0.3			0.3
Amortization of actuarial gain		(4.0	)		(2.2	)		(1.6	)		(3.2	)		(1.9	)		(1.5	)		(0.5	)		—			—
Subtotal		(6.2	)		(4.5	)		(3.4	)		(2.6	)		(1.7	)		(1.0	)		(3.3	)		(2.4	)		(2.4	)
Regulatory adjustment		0.6			3.3			13.2			1.8			5.0			15.0			(1.3	)		(1.8	)		(1.8	)
Net postretirement benefit (income) cost	$	(5.6	)	$	(1.2	)	$	9.8		$	(0.8	)	$	3.3		$	14.0		$	(4.6	)	$	(4.2	)	$	(4.2	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial loss (gain)	$	14.5		$	(16.9	)	$	(8.1	)	$	5.7		$	0.9		$	(0.9	)	$	9.0		$	(16.0	)	$	(1.5	)
Amortization of actuarial loss		(6.6	)		(11.9	)		(14.9	)		(6.1	)		(9.6	)		(11.0	)		(0.9	)		(2.4	)		(3.9	)
Acceleration of loss recognized due to settlement		(9.7	)		(33.6	)		(18.2	)		(0.6	)		(27.3	)		(11.6	)		(9.1	)		(6.3	)		(6.6	)
Current year service credit		—			—			(17.9	)		—			—			(17.9	)		—			—			—
Amortization of prior service credit		4.5			4.5			3.1			1.9			1.9			0.6			2.4			2.4			2.3
Subtotal		2.7			(57.9	)		(56.0	)		0.9			(34.1	)		(40.8	)		1.4			(22.3	)		(9.7	)
Regulatory adjustment		(2.8	)		56.3			57.3			(1.0	)		32.5			42.1			(1.4	)		22.3			9.7
Total recognized in OCI	$	(0.1	)	$	(1.6	)	$	1.3		$	(0.1	)	$	(1.6	)	$	1.3		$	—		$	—		$	—

	Spire									Spire Missouri									Spire Alabama
	2023			2022			2021			2023			2022			2021			2023			2022			2021
Current year actuarial (gain) loss	$	(24.4	)	$	15.8		$	(41.0	)	$	(21.5	)	$	9.8		$	(29.0	)	$	(1.1	)	$	5.9		$	(9.9	)
Amortization of actuarial gain		4.0			2.2			1.6			3.2			1.9			1.5			0.5			—			—
Current year prior service cost		—			(6.3	)		—						(1.1	)		—			—			(5.2	)		—
Amortization of prior service (cost) credit		(0.3	)		(1.0	)		(1.0	)		(0.6	)		(0.7	)		(0.7	)		0.3			(0.3	)		(0.3	)
Subtotal		(20.7	)		10.7			(40.4	)		(18.9	)		9.9			(28.2	)		(0.3	)		0.4			(10.2	)
Regulatory adjustment		20.7			(10.7	)		40.4			18.9			(9.9	)		28.2			0.3			(0.4	)		10.2
Total recognized in OCI	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	464.4		$	689.6		$	320.6		$	479.0		$	97.8		$	149.4
Service cost		16.3			20.0			11.4			14.4			4.2			4.8
Interest cost		25.1			21.5			17.8			14.7			4.8			4.7
Actuarial (gain) loss		(1.1	)		(173.9	)		(4.9	)		(116.2	)		5.4			(42.4	)
Settlement loss		9.7			33.4			0.6			27.9			9.1			5.6
Settlement benefits paid		(48.8	)		(109.3	)		(9.9	)		(87.0	)		(38.8	)		(22.3	)
Regular benefits paid		(26.9	)		(16.9	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Benefit obligation, end of year	$	438.7		$	464.4		$	313.2		$	320.6		$	80.6		$	97.8
Accumulated benefit obligation, end of year	$	433.1		$	457.1		$	309.5		$	315.0		$	78.8		$	96.2

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Benefit obligation, beginning of year	$	148.1		$	204.2		$	114.8		$	151.7		$	29.9		$	48.0
Service cost		4.8			7.5			4.0			6.3			0.7			1.1
Interest cost		8.5			6.0			6.5			4.5			1.8			1.4
Actuarial (gain) loss		(10.6	)		(52.6	)		(13.4	)		(37.7	)		4.2			(13.6	)
Plan amendments		—			(6.2	)		—			(1.0	)		—			(5.2	)
Retiree drug subsidy program		0.2			0.2			0.2			0.2			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Benefit obligation, end of year	$	142.6		$	148.1		$	105.3		$	114.8		$	35.1		$	29.9

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets, beginning of year	$	332.7		$	498.9		$	235.9		$	364.0		$	57.3		$	82.8
Actual return on plan assets		9.1			(92.5	)		7.5			(66.7	)		—			(15.6	)
Employer contributions		58.9			52.4			30.3			37.8			27.9			14.4
Settlement benefits paid		(39.1	)		(109.3	)		(9.3	)		(87.0	)		(29.7	)		(22.3	)
Regular benefits paid		(26.9	)		(16.8	)		(22.4	)		(12.2	)		(1.9	)		(2.0	)
Fair value of plan assets, end of year	$	334.7		$	332.7		$	242.0		$	235.9		$	53.6		$	57.3
Funded status of plans, end of year	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Fair value of plan assets at beginning of year	$	264.7		$	326.9		$	176.7		$	221.7		$	83.3		$	99.4
Actual return on plan assets		29.9			(51.6	)		18.8			(36.2	)		10.2			(14.3	)
Employer contributions		0.1			0.4			0.1			0.4			—			—
Benefits paid		(8.4	)		(11.0	)		(6.8	)		(9.2	)		(1.5	)		(1.8	)
Fair value of plan assets, end of year	$	286.3		$	264.7		$	188.8		$	176.7		$	92.0		$	83.3
Funded status of plans, end of year	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9		$	53.4

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Current liabilities	$	(1.6	)	$	(1.1	)	$	(1.6	)	$	(1.1	)	$	—		$	—
Noncurrent liabilities		(102.4	)		(130.6	)		(69.6	)		(83.6	)		(27.0	)		(40.5	)
Total	$	(104.0	)	$	(131.7	)	$	(71.2	)	$	(84.7	)	$	(27.0	)	$	(40.5	)

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023		2022
Noncurrent assets	$	180.7		$	151.6		$	120.5		$	96.9		$	56.9	$	53.4
Current liabilities		(0.4	)		(0.3	)		(0.4	)		(0.3	)		—		—
Noncurrent liabilities		(36.6	)		(34.7	)		(36.6	)		(34.7	)		—		—
Total	$	143.7		$	116.6		$	83.5		$	61.9		$	56.9	$	53.4

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial loss	$	130.1		$	132.0		$	92.5		$	93.6		$	40.2		$	41.2
Prior service credit		(31.2	)		(35.7	)		(16.2	)		(18.1	)		(13.9	)		(16.3	)
Subtotal		98.9			96.3			76.3			75.5			26.3			24.9
Adjustments for amounts included in regulatory assets		(95.9	)		(93.1	)		(73.3	)		(72.3	)		(26.3	)		(24.9	)
Total	$	3.0		$	3.2		$	3.0		$	3.2		$	—		$	—

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Net actuarial gain	$	(103.3	)	$	(83.3	)	$	(92.3	)	$	(74.2	)	$	(6.1	)	$	(5.6	)
Prior service cost (credit)		7.0			7.1			7.4			7.9			(0.4	)		(0.8	)
Subtotal		(96.3	)		(76.2	)		(84.9	)		(66.3	)		(6.5	)		(6.4	)
Adjustments for amounts included in regulatory assets		96.3			76.2			84.9			66.3			6.5			6.4
Total	$	—		$	—		$	—		$	—		$	—		$	—

Defined Benefit Plan, Assumptions [Table Text Block]

	2023		2022		2021
Weighted average discount rate - Spire Missouri East plan		5.70%		3.00%		2.85%
Weighted average discount rate - Spire Missouri West plan		5.80%		3.00%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

	2023		2022		2021
Weighted average discount rate	5.65%/5.7%		3.10%/3.0%		2.95%/2.80%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets		6.50%		6.75%		6.75%

	2023		2022
Weighted average discount rate - Spire Missouri East plan		6.25%		5.70%
Weighted average discount rate - Spire Missouri West plan		6.30%		5.80%
Weighted average discount rate - Spire Alabama plans	6.2%/6.25%		5.70%/5.65%
Weighted average rate of future compensation increase		3.00%		3.00%
Cash balance interest crediting rate - Spire Alabama / Spire Missouri		4.25%		4.25%

	2023		2022		2021
Weighted average discount rate - Spire Missouri plans		5.80%		2.95%		2.75%
Weighted average rate of future compensation increase		3.00%		3.00%		3.00%
Expected long-term rate of return on plan assets - Spire Missouri plans		5.50%		5.75%		5.75%

	2023		2022		2021
Weighted average discount rate		5.80%		2.95%		2.75%
Expected long-term rate of return on plan assets	4.75%/6.0%		5.00%/6.25%		5.00%/6.25%

	2023		2022
Weighted average discount rate - Spire Alabama plans and Spire Missouri Plans		6.30%		5.80%
Weighted average rate of future compensation increase - Spire Missouri East plans		3.00%		3.00%

Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]

	Spire				Spire Missouri				Spire Alabama
	2023		2022		2023		2022		2023		2022
Projected benefit obligation	$	438.7	$	464.4	$	313.2	$	320.6	$	80.6	$	97.8
Accumulated benefit obligation		433.1		457.1		309.5		315.0		78.8		96.2
Fair value of plan assets		334.7		332.7		242.0		235.9		53.6		57.3

Schedule of Allocation of Plan Assets [Table Text Block]

Spire Missouri	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		70.0	%		77.0	%		70.0	%		74.3	%
Liability hedging assets		30.0	%		20.0	%		30.0	%		22.8	%
Cash and cash equivalents		—	%		3.0	%		—	%		2.9	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Spire Alabama	2023 Target			2023 Actual			2022 Target			2022 Actual
Return seeking assets		75.0	%		76.0	%		70.0	%		68.7	%
Liability hedging assets		25.0	%		15.0	%		30.0	%		25.3	%
Cash and cash equivalents		—	%		9.0	%		—	%		6.0	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Spire Missouri	Target			2023 Actual			2022 Actual
Equity securities		60.0	%		58.9	%		58.7	%
Debt securities		40.0	%		38.1	%		40.5	%
Cash and cash equivalents		—	%		3.0	%		0.8	%
Total		100.0	%		100.0	%		100.0	%

Spire Alabama	Target			2023 Actual			2022 Actual
Equity securities		60.5	%		59.9	%		57.7	%
Debt securities		39.5	%		40.1	%		42.3	%
Total		100.0	%		100.0	%		100.0	%

Schedule of Expected Benefit Payments [Table Text Block]

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	52.4	$	45.3	$	41.8	$	41.8	$	43.3	$	202.8
Spire Missouri		41.0		34.1		30.4		29.4		30.5		139.1
Spire Alabama		8.0		7.7		7.8		8.7		8.9		44.1

	2024		2025		2026		2027		2028		2029 – 2032
Spire	$	14.6	$	14.8	$	14.9	$	14.8	$	14.5	$	68.6
Spire Missouri		11.6		11.8		11.8		11.7		11.4		52.2
Spire Alabama		2.9		2.9		2.9		2.9		2.9		15.0

Schedule of Health Care Cost Trend Rates [Table Text Block]

	2023	2022
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri	6.50%	6.75%
Rate to which the medical cost trend rate is assumed to decline (the ultimate medical cost trend rate)	5.00%	5.00%
Year the rate reaches the ultimate trend	2030	2028

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	14.8	$	—	$	14.8	$	11.5	$	—	$	11.5
Equity funds - global (including U.S.)		—		139.0		139.0		—		122.2		122.2
Real asset funds		—		55.2		55.2		—		61.0		61.0
Debt securities:
U.S. bond funds		27.8		—		27.8		42.3		—		42.3
U.S. government index funds		36.2		—		36.2		36.1		—		36.1
Global funds (including U.S.)		—		61.7		61.7		—		59.6		59.6
Total	$	78.8	$	255.9	$	334.7	$	89.9	$	242.8	$	332.7

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	5.1	$	—	$	5.1	$	3.5	$	—	$	3.5
U.S. stock/bond mutual funds		188.2		76.5		264.7		177.1		69.4		246.5
International fund		—		16.5		16.5		0.8		13.9		14.7
Total	$	193.3	$	93.0	$	286.3	$	181.4	$	83.3	$	264.7

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	6.8	$	—	$	6.8	$	5.7	$	—	$	5.7
Equity funds - global (including U.S.)		—		99.4		99.4		—		85.7		85.7
Real asset funds		—		40.2		40.2		—		47.2		47.2
Debt securities:
U.S. bond funds		20.9		—		20.9		29.4		—		29.4
U.S. government index funds		28.7		—		28.7		24.6		—		24.6
Global funds (including U.S.)		—		46.0		46.0		—		43.3		43.3
Total	$	56.4	$	185.6	$	242.0	$	59.7	$	176.2	$	235.9

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.3	$	—	$	4.3	$	2.7	$	—	$	2.7
U.S. stock/bond mutual funds		184.5		—		184.5		174.0		—		174.0
Total	$	188.8	$	—	$	188.8	$	176.7	$	—	$	176.7

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
Cash and cash equivalents	$	4.6	$	—	$	4.6	$	3.5	$	—	$	3.5
Equity funds - global (including U.S.)		—		22.9		22.9		—		21.6		21.6
Real asset funds		—		8.7		8.7		—		8.1		8.1
Debt securities:
U.S. bond funds		4.0		—		4.0		7.7		—		7.7
U.S. government index funds		4.3		—		4.3		6.8		—		6.8
Global funds (including U.S.)		—		9.1		9.1		—		9.6		9.6
Total	$	12.9	$	40.7	$	53.6	$	18.0	$	39.3	$	57.3

	As of September 30, 2023						As of September 30, 2022
	Quoted Prices		Significant				Quoted Prices		Significant
	in Active		Observable				in Active		Observable
	Markets		Inputs				Markets		Inputs
	(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)		Total
U.S. stock/bond mutual funds	$	—	$	76.5	$	76.5	$	—	$	69.4	$	69.4
International fund		—		15.5		15.5		—		13.9		13.9
Total	$	—	$	92.0	$	92.0	$	—	$	83.3	$	83.3

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Note 14 - Information by Operating Segment (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Gas		Gas
2023	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,456.6	$	179.1	$	29.9	$	0.7		$	—		$	2,666.3
Intersegment revenues		0.3		—		36.2		16.0			(52.5	)		—
Total Operating Revenues		2,456.9		179.1		66.1		16.7			(52.5	)		2,666.3
Depreciation and amortization expense		244.4		1.5		8.4		0.5			—			254.8
Interest expense		139.9		—		8.6		72.1			(34.9	)		185.7
Income tax expense (benefit)		32.7		12.8		3.8		(10.5	)		—			38.8
Net economic earnings (loss)		200.5		47.6		14.1		(34.1	)		—			228.1
Capital expenditures		588.6		0.4		73.6		(0.1	)		—			662.5

	Gas		Gas
2022	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	1,945.6	$	234.9	$	17.4	$	0.6		$	—		$	2,198.5
Intersegment revenues		0.5		—		35.7		15.5			(51.7	)		—
Total Operating Revenues		1,946.1		234.9		53.1		16.1			(51.7	)		2,198.5
Depreciation and amortization expense		227.9		1.4		7.5		0.5			—			237.3
Interest expense		86.4		—		4.9		37.3			(8.8	)		119.8
Income tax expense (benefit)		49.6		11.9		4.5		(7.1	)		—			58.9
Net economic earnings (loss)		202.7		27.0		11.1		(24.5	)		—			216.3
Capital expenditures		528.6		0.9		22.6		0.1			—			552.2

	Gas		Gas
2021	Utility		Marketing		Midstream		Other			Eliminations			Consolidated
Revenues from external customers	$	2,118.2	$	96.5	$	19.9	$	0.9		$	—		$	2,235.5
Intersegment revenues		1.1		—		32.7		14.2			(48.0	)		—
Total Operating Revenues		2,119.3		96.5		52.6		15.1			(48.0	)		2,235.5
Depreciation and amortization expense		204.4		1.2		6.9		0.6			—			213.1
Interest expense		74.7		—		4.0		29.3			(1.4	)		106.6
Income tax expense (benefit)		56.9		13.4		4.4		(6.2	)		—			68.5
Net economic earnings (loss)		230.6		47.0		11.1		(22.4	)		—			266.3
Capital expenditures		590.4		0.7		33.0		0.7			—			624.8

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

Total Assets at End of Year	2023			2022			2021
Gas Utility	$	8,486.7		$	8,042.8		$	7,615.4
Gas Marketing		332.0			638.7			466.1
Midstream		574.3			446.0			413.8
Other		2,533.3			2,705.5			2,193.3
Eliminations		(1,612.7	)		(1,749.3	)		(1,332.2	)
Total Assets	$	10,313.6		$	10,083.7		$	9,356.4

Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income [Table Text Block]

Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings	2023			2022			2021
Net Income	$	217.5		$	220.8		$	271.7
Adjustments, pre-tax:
Missouri regulatory adjustments		—			—			(9.0	)
Fair value and timing adjustments		11.4			(11.4	)		3.3
Acquisition and divestiture activities		2.5			—			(1.3	)
Income tax adjustments		(3.3	)		6.9			1.6
Net Economic Earnings	$	228.1		$	216.3		$	266.3

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Note 15 - Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Regulatory Assets and Liabilities [Table Text Block]

	Spire				Spire Missouri				Spire Alabama
September 30	2023		2022		2023		2022		2023		2022
Regulatory Assets:
Current:
Unamortized purchased gas adjustments	$	293.2	$	322.2	$	269.4	$	275.1	$	21.7	$	43.8
Other		55.1		33.2		23.7		13.0		19.9		13.1
Total Current Regulatory Assets		348.3		355.4		293.1		288.1		41.6		56.9
Noncurrent:
Future income taxes due from customers		144.5		137.8		136.2		129.2		2.0		2.2
Pension and postretirement benefit costs		261.0		294.5		189.1		222.9		67.8		66.5
Cost of removal		633.2		493.7		97.0		25.2		536.2		468.5
Unamortized purchased gas adjustments		23.0		—		23.0		—		—		—
Energy efficiency		56.3		57.2		56.3		57.2		—		—
Other		131.2		129.2		116.0		113.1		0.9		1.0
Total Noncurrent Regulatory Assets		1,249.2		1,112.4		617.6		547.6		606.9		538.2
Total Regulatory Assets	$	1,597.5	$	1,467.8	$	910.7	$	835.7	$	648.5	$	595.1
Regulatory Liabilities:
Current:
Other	$	7.3	$	3.7	$	—	$	—	$	—	$	—
Total Current Regulatory Liabilities		7.3		3.7		—		—		—		—
Noncurrent:
Deferred taxes due to customers		128.0		145.3		114.8		127.9		—		—
Pension and postretirement benefit costs		185.2		172.6		156.5		143.6		17.9		19.4
Accrued cost of removal		126.6		32.9		90.4		—		—		—
Unamortized purchased gas adjustments		11.2		53.0		11.2		53.0		—		—
Other		21.4		14.4		16.5		7.3		3.3		3.6
Total Noncurrent Regulatory Liabilities		472.4		418.2		389.4		331.8		21.2		23.0
Total Regulatory Liabilities	$	479.7	$	421.9	$	389.4	$	331.8	$	21.2	$	23.0

Schedule of Regulatory Assets Not Earning Return [Table Text Block]

	Spire				Spire Missouri
September 30	2023		2022		2023		2022
Pension and postretirement benefit costs	$	133.4	$	152.9	$	133.4	$	152.9
Future income taxes due from customers		142.5		135.6		136.2		129.2
Unamortized purchase gas adjustments		292.4		275.1		292.4		275.1
Other		104.2		122.7		104.2		122.7
Total Regulatory Assets Not Earning a Return	$	672.5	$	686.3	$	666.2	$	679.9

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Note 17 - Leases (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Operating Lease Cost, Cash Flow and Non Cash Information [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023		2022		2021		2023		2022		2021		2023		2022		2021
Operating lease cost, including amounts capitalized	$	7.3	$	7.4	$	7.2	$	0.5	$	0.5	$	0.4	$	2.0	$	2.1	$	2.1
Cash flow and noncash information about operating leases:
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities		7.3		7.3		7.2		0.5		0.5		0.4		2.1		2.1		2.1
Right-of-use assets obtained in exchange for lease liabilities		0.8		24.6		—		0.8		1.1		—		—		23.5		—

Schedule of Balance Sheet and Weighted Average Information About Operating Leases [Table Text Block]

	Spire						Spire Missouri						Spire Alabama
	2023			2022			2023			2022			2023			2022
Right-of-use assets	$	70.6		$	73.7		$	2.1		$	1.7		$	19.2		$	20.2
Lease liabilities, current		6.8			6.5			0.5			0.4			1.9			1.9
Lease liabilities, noncurrent		70.2			73.7			1.8			1.5			23.5			24.6
Weighted-average remaining lease term (in years)		14.1			15.0			5.6			5.1			13.3			14.3
Weighted-average discount rate		4.2	%		4.1	%		3.3	%		2.2	%		3.7	%		3.7	%

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

	Spire			Spire Missouri			Spire Alabama
2024	$	6.9		$	0.5		$	1.9
2025		7.5			0.6			2.2
2026		7.5			0.4			2.2
2027		7.4			0.3			2.3
2028		7.4			0.3			2.3
Thereafter		65.9			0.5			21.7
Total undiscounted lease payments		102.6			2.6			32.6
Less present value discount		(25.6	)		(0.3	)		(7.2	)
Total current and noncurrent lease liabilities	$	77.0		$	2.3		$	25.4

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Number of Reportable Segments		3
Difference Between Replacement Cost of Gas Storage and Inventory Basis Amount		$ 21.1	$ 37.3
Goodwill		1,171.6	1,171.6
Payments to Acquire Businesses, Gross	$ 37.0	37.0	(0.0)	$ (0.0)
Restricted Cash		20.2	$ 14.0
Gas Utility [Member]
Goodwill		$ 210.2
Spire Alabama Inc [Member]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service		3.00%	3.00%	3.00%
Financing Receivable, after Allowance for Credit Loss		$ 6.7	$ 7.1
Spire Alabama Inc [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		$ 0.3	$ 0.3
Spire Missouri [Member]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service		3.00%	3.00%	3.00%
Goodwill		$ 210.2	$ 210.2

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Note 1 - Summary of Significant Accounting Policies - Accrued Capital Expenditures Excluded from Capital Expenditures in the Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Accrued capital expenditures	$ 104.3	$ 77.8	$ 59.5
Spire Missouri [Member]
Accrued capital expenditures	56.5	45.6	37.1
Spire Alabama Inc [Member]
Accrued capital expenditures	$ 4.6	$ 19.2	$ 13.6

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Note 1 - Summary of Significant Accounting Policies - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Asset retirement obligations, beginning of year	$ 520.9	$ 519.6
Liabilities incurred during the period	7.9	3.2
Liabilities settled during the period	(6.8)	(9.2)
Accretion	21.5	21.1
Revisions in estimated cash flows	33.9	(13.8)
Asset retirement obligations, end of year	577.4	520.9
Spire Missouri [Member]
Asset retirement obligations, beginning of year	110.6	143.4
Liabilities incurred during the period	0.9	1.2
Liabilities settled during the period	(2.5)	(4.1)
Accretion	4.5	5.9
Revisions in estimated cash flows	(2.4)	(35.8)
Asset retirement obligations, end of year	111.1	110.6
Spire Alabama Inc [Member]
Asset retirement obligations, beginning of year	398.7	362.8
Liabilities incurred during the period	2.0	0.5
Liabilities settled during the period	(2.5)	(2.0)
Accretion	16.5	14.7
Revisions in estimated cash flows	36.3	22.7
Asset retirement obligations, end of year	$ 451.0	$ 398.7

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Note 1 - Summary of Significant Accounting Policies - Transactions With Affiliates (Details) - Affiliated Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Regulated Operation [Member] | Spire Marketing [Member] | Spire Missouri [Member]
Natural gas purchases from Spire Marketing	$ 57.4	$ 86.3	$ 92.5
Transaction amount	0.4	0.0	1.1
Regulated Operation [Member] | Spire Marketing [Member] | Spire Alabama Inc [Member]
Natural gas purchases from Spire Marketing	4.7	3.2	10.4
Transaction amount	0.0	0.5	0.1
Unregulated Operation [Member] | Spire S T L Pipeline L L C [Member] | Spire Missouri [Member]
Transaction amount	32.0	32.0	32.0
Unregulated Operation [Member] | Spire S T L Pipeline L L C [Member] | Spire Alabama Inc [Member]
Transaction amount	0.0	0.0	0.0
Unregulated Operation [Member] | Spire Storage Salt Plains LLC [Member] | Spire Missouri [Member]
Transaction amount	0.7	0.0	0.0
Unregulated Operation [Member] | Spire Storage Salt Plains LLC [Member] | Spire Alabama Inc [Member]
Transaction amount	0.0	0.0	0.0
Unregulated Operation [Member] | Spire N G L Inc [Member] | Spire Missouri [Member]
Transaction amount	0.0	0.0	0.5
Unregulated Operation [Member] | Spire N G L Inc [Member] | Spire Alabama Inc [Member]
Transaction amount	$ 0.0	$ 0.0	$ 0.0

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Note 1 - Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Allowance at beginning of year	$ 31.9	$ 30.3	$ 24.9
Provision for expected credit losses	16.6	11.6	14.7
Write-offs, net of recoveries	(16.0)	(10.0)	(9.3)
Allowance at end of year	32.5	31.9	30.3
Spire Missouri [Member]
Allowance at beginning of year	24.9	22.6	18.1
Provision for expected credit losses	13.3	11.2	11.1
Write-offs, net of recoveries	(12.0)	(8.9)	(6.6)
Allowance at end of year	26.2	24.9	22.6
Spire Alabama Inc [Member]
Allowance at beginning of year	6.3	6.6	5.5
Provision for expected credit losses	2.6	0.3	3.1
Write-offs, net of recoveries	(3.2)	(0.6)	(2.0)
Allowance at end of year	$ 5.7	$ 6.3	$ 6.6

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Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues	$ 2,666.3	$ 2,198.5	$ 2,235.5
Consolidation, Eliminations [Member]
Operating Revenues	(52.5)	(51.7)	(48.0)
Gas Utility [Member] | Operating Segments [Member]
Operating Revenues	2,456.9	1,946.1	2,119.3
Gas Marketing [Member] | Operating Segments [Member]
Operating Revenues	179.1	234.9	96.5
Midstream [Member] | Operating Segments [Member]
Operating Revenues	66.1	53.1	52.6
Other Segments [Member] | Consolidation, Eliminations [Member]
Operating Revenues	16.7	16.1	15.1
Spire [Member]
Operating Revenues	2,666.3	2,198.5	2,235.5
Spire [Member] | Operating Segments [Member]
Operating Revenues	2,718.8	2,250.2	2,283.5
Spire [Member] | Consolidation, Eliminations [Member]
Operating Revenues	(52.5)		(48.0)
Spire [Member] | Segment Reconciling Items [Member]
Operating Revenues		(51.7)
Spire [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	2,422.2	1,935.4	2,117.8
Changes in accrued revenue under alternative revenue programs	34.7	10.7	1.5
Total Gas Utility operating revenues	2,456.9	1,946.1	2,119.3
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	1,648.5	1,416.6	1,234.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	606.0	338.9	586.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	121.6	118.0	122.9
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	30.0	42.0	152.7
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	16.1	19.9	22.2
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member]
Unregulated Operating Revenue	179.1	234.9	96.5
Spire [Member] | Midstream [Member] | Operating Segments [Member]
Unregulated Operating Revenue	66.1	53.1	52.6
Spire [Member] | Other Segments [Member] | Operating Segments [Member]
Unregulated Operating Revenue	16.7	16.1	15.1
Spire Missouri [Member]
Changes in accrued revenue under alternative revenue programs	23.9	12.8	3.0
Operating Revenues	1,762.9	1,321.0	1,516.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	1,739.0	1,308.2	1,513.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	1,261.3	1,061.4	882.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	411.9	177.2	436.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	33.2	33.3	33.5
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	20.1	25.2	145.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	12.5	11.1	16.3
Spire Alabama Inc [Member]
Changes in accrued revenue under alternative revenue programs	6.7	1.7	3.4
Operating Revenues	571.1	509.1	494.0
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	564.4	507.4	490.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	322.9	291.6	288.0
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	150.4	119.1	114.9
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	77.6	74.4	78.7
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	9.9	16.8	7.1
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	$ 3.6	$ 5.5	$ 1.9

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Note 2 - Revenue - Taxes Associated with Natural Gas Utility Services (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Gross Receipts Tax Amounts	$ 131.8	$ 109.8	$ 94.0
Spire Missouri [Member]
Gross Receipts Tax Amounts	96.7	79.6	64.3
Spire Alabama Inc [Member]
Gross Receipts Tax Amounts	$ 29.9	$ 25.5	$ 25.1

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Note 3 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	1,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Deferred (in shares)	244,618
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 12.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 8 months 12 days
Performance-contingent Restricted Share Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	116,390
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 79.88
Performance-contingent Restricted Share Units [Member] | Executive Officers and Key Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	116,390
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 79.88	$ 67.43	$ 68.69
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Target Award Percentage	200.00%
Share Based Compensation Arrangement By Share Based Payment Award, Number of Shares to Be Issued at Maximum Performance Target (in shares)	696,706
Time-vested Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	68,244
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 72.6
Time-vested Restricted Stock [Member] | Executive Officers and Key Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	55,524
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 71.91	63.57	64.29
Time-vested Restricted Stock [Member] | Non Employee Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	12,720
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 75.59	$ 66.31	$ 62.35
Performance-contingent Restricted Stock Unit and Time-vested Restricted Stocks [Member]
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	18,428	28,055	16,787
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Withheld for Tax Withholding Obligations, Weighted Average Price Per Share (in dollars per share)	$ 72.03	$ 63.97	$ 65.99
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 8.6	$ 10.1	$ 6.5
Share Based Compensation Tax Benefit Realized From Exercise Of Equity Instruments Other Than Stock Options	$ 3.2	$ 3.8	$ 2.5

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Note 3 - Stock-based Compensation - Activity of Restricted Stock Units (Details)	12 Months Ended
	Sep. 30, 2023 $ / shares shares
Performance-contingent Restricted Share Units [Member]
Nonvested, units (in shares) | shares	343,524
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 70.14
Granted, units (in shares) | shares	116,390
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 79.88
Adjusted for performance, units (in shares) | shares	(13,459)
Adjusted for performance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 76.91
Vested, units (in shares) | shares	(74,556)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 76.91
Forfeited, units (in shares) | shares	(23,546)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 71.73
Nonvested, units (in shares) | shares	348,353
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 71.76
Time-vested Restricted Stock [Member]
Nonvested, units (in shares) | shares	122,245
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 66.6
Granted, units (in shares) | shares	68,244
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 72.6
Vested, units (in shares) | shares	(59,040)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 75.27
Forfeited, units (in shares) | shares	(8,460)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 65.36
Nonvested, units (in shares) | shares	122,989
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 65.85

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Note 3 - Stock-based Compensation - Schedule of Significant Assumptions (Details)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Risk-free interest rate	4.26%	0.79%	0.22%
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	33.80%	32.20%	31.40%
Performance period (in years) (Year)	3 years	3 years	3 years

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Note 3 - Stock-based Compensation - Compensation Cost of Share-based Compensation Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Total compensation cost	$ 11.2	$ 7.5	$ 16.6
Compensation cost capitalized	(1.4)	(1.1)	(2.7)
Compensation cost recognized in net income	9.8	6.4	13.9
Income tax benefit recognized in net income	(2.2)	(1.5)	(3.2)
Compensation cost recognized in net income, net of income tax	$ 7.6	$ 4.9	$ 10.7

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Note 4 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Net Income		$ 217.5	$ 220.8	$ 271.7
Provision for preferred dividends		14.8	14.8	14.8
Income allocated to participating securities		0.3	0.3	0.4
Net Income Available to Common Shareholders		$ 202.4	$ 205.7	$ 256.5
Basic (in shares)		52.5	52.0	51.6
Basic Earnings Per Share of Common Stock (in dollars per share)		$ 3.86	$ 3.96	$ 4.97
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* (in shares)	[1]	0.1	0.1	0.1
Weighted Average Diluted Common Shares (in millions) (in shares)		52.6	52.1	51.7
Diluted Earnings Per Share of Common Stock (in dollars per share)		$ 3.85	$ 3.95	$ 4.96
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to common stock forward contracts, stock units subject to performance or market conditions, and restricted stock, which could have a dilutive effect in the future (in shares)		1.9	0.1	0.1

[1] Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future

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Note 5 - Shareholders' Equity (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended		19 Months Ended
	Sep. 27, 2023	May 21, 2019	Feb. 28, 2021	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Mar. 01, 2024	Nov. 10, 2023	Apr. 28, 2022
Preferred Stock, Shares Authorized (in shares)						5,000,000		5,000,000
Number of Shares Authorized for Issuance (in shares)						250,000		250,000
Number Of Shares Remaining and Available for Issuance (in shares)						244,182		244,182
Retained Earnings Dividend Restrictions Formula Component Fixed Amount							$ 8,000,000
Retained Earnings, Unappropriated						$ 1,678,500,000	1,579,400,000	$ 1,678,500,000
Stock Issued During Period, Value, New Issues						$ 40,500,000	$ 50,300,000
Spire Missouri [Member]
Preferred Stock, Shares Authorized (in shares)							1,480,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						0	0	0
Regulatory Preferred Stock and Debt Securities Issuance Amount Authorized						$ 800,000,000		$ 800,000,000
Stock Issued During Period, Value, New Issues						$ 38,700,000	$ 51,100,000
Preferred Stock, Shares Issued (in shares)						0	0	0
Spire Alabama Inc [Member]
Preferred Stock, Shares Authorized (in shares)						120,000	120,000	120,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						0	0	0
Preferred Stock, Shares Issued (in shares)						0	0	0
Forecast [Member]
Number Of Shares Remaining and Available for Issuance (in shares)										237,891
At The Market Program [Member]
Number of Shares Authorized for Issuance (in shares)						17,900,000		17,900,000			200,000,000
Forward Sales Agreements, Shares (in shares)				2,087,231	228,690
Forward Sales Agreements, Shares Settled (in shares)	571,372
Proceeds from Shares Settled	$ 38,500,000
Forward Sales Agreements, Block Sales, Shares (in shares)						1,744,549
Forward Sales Agreements, Proceeds If Settled						$ 111,200,000		$ 111,200,000
Universal Shelf Registration [Member] | Spire Missouri [Member]
Stock Issued During Period, Value, New Issues						$ 79,100,000		79,100,000
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						611,872	719,625
Stock Issued During Period, Value, New Issues						$ 600,000	$ 700,000
Common Stock [Member] | Spire Missouri [Member]
Stock Issued During Period, Shares, New Issues (in shares)						530	748
Stock Issued During Period, Value, New Issues						$ 0	$ 0
First Mortgage Bond [Member] | Spire Missouri [Member]
Debt Instrument, Face Amount						400,000,000		400,000,000
Parent Company [Member]
Present Value of Stock Purchase Contract Payment						$ 35,000,000		$ 35,000,000
Parent Company [Member] | Common Stock [Member] | Minimum [Member]
Number of Shares to Be Purchased Per Stock Purchase Contract Settlement Rate (in shares)			0.6354
Parent Company [Member] | Common Stock [Member] | Minimum [Member] | Forecast [Member]
Number of Shares to Be Purchased Per Stock Purchase Contract Settlement Rate (in shares)									0.6354
Parent Company [Member] | Two Thousand Twenty One Series A Zero Point Seven Five Percentage Remarketable Senior Notes [Member]
Debt Instrument, Face Amount			$ 1,000
Debt Instrument, Interest Rate, Stated Percentage			0.75%
Stock Purchase Contracts Rate			6.75%
Redemption Prior to August Fifteen Two Thousand Twenty Four [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share)						$ 25,500		$ 25,500
Redemption on Or After August Fifteen Two Thousand Twenty Four [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share)						$ 25,000		$ 25,000
Depositary Shares [Member]
Preferred Stock, Shares Authorized (in shares)						10,000,000	10,000,000	10,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)		10,000,000				10,000,000	10,000,000	10,000,000
Preferred Stock, Share Interest Rate		0.001%
Preferred Stock, Dividend Rate, Percentage		5.90%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 25				$ 25	$ 25	$ 25
Preferred Stock, Liquidation Preference Per Share (in dollars per share)		$ 25,000
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 242,000,000
Preferred Stock, Shares Issued (in shares)						10,000,000	10,000,000	10,000,000
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage		5.90%
Corporate Unit [Member] | Parent Company [Member]
Stock Issued During Period, Shares, New Issues (in shares)			3,500,000
Equity Stock Units Issued			$ 175,000,000
Proceeds from Issuance or Sale of Equity, Total			$ 169,300,000
Equity Units, Stated Value (in dollars per share)			$ 50
Percentage of Undivided Beneficial Ownership Interest			5.00%
Shares Issued, Price Per Share (in dollars per share)			$ 50

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Note 5 - Shareholders' Equity - Number of Shares to be Purchased Per Stock Purchase Contract (Details) - Common Stock [Member] - Parent Company [Member] - $ / shares	Mar. 01, 2024	Feb. 28, 2021
Forecast [Member]
Less than $78.6906, but greater than $64.24 (in dollars per share)	$ 50
Minimum [Member]
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares)		0.6354
Minimum [Member] | Forecast [Member]
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares)	0.6354
Maximum [Member] | Forecast [Member]
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares)	0.7783

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Note 5 - Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2021
Balance		$ 2,818.5		$ 2,658.2		$ 2,522.3
Other Comprehensive Income (Loss), Net of Tax		0.4		43.6		44.8
Balance		2,917.3		2,818.5		2,658.2
Spire Missouri [Member]
Balance	[1]	1,745.4		1,577.9		1,435.1
Other Comprehensive Income (Loss), Net of Tax		0.2	[1]	1.5	[1]	(1.3)
Balance	[1]	1,844.8		1,745.4		1,577.9
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		50.4		7.9
Other Comprehensive Income (Loss), Net of Tax		0.1		42.5
Balance		50.5		50.4		7.9
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Spire Missouri [Member]
Balance		0.0		0.0
Other Comprehensive Income (Loss), Net of Tax		0.0		0.0
Balance		0.0		0.0		0.0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(2.7)		(4.2)
Other Comprehensive Income (Loss), Net of Tax		0.2		1.5
Balance		(2.5)		(2.7)		(4.2)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Spire Missouri [Member]
Balance		(2.7)		(4.2)
Other Comprehensive Income (Loss), Net of Tax		0.2		1.5
Balance		(2.5)		(2.7)		(4.2)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance		(0.5)		(0.1)
Other Comprehensive Income (Loss), Net of Tax		0.1		(0.4)
Balance		(0.4)		(0.5)		(0.1)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] | Spire Missouri [Member]
Balance		0.0		0.0
Other Comprehensive Income (Loss), Net of Tax		0.0		0.0
Balance		0.0		0.0		0.0
AOCI Attributable to Parent [Member]
Balance		47.2		3.6	[1]	(41.2)	[1]
Other Comprehensive Income (Loss), Net of Tax		0.4		43.6		44.8
Balance		47.6		47.2		3.6	[1]
AOCI Attributable to Parent [Member] | Spire Missouri [Member]
Balance		(2.7)		(4.2)		(2.9)
Other Comprehensive Income (Loss), Net of Tax		0.2		1.5		(1.3)
Balance		$ (2.5)		$ (2.7)		$ (4.2)

[1] Accumulated other comprehensive income (loss)

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Note 6 - Long-term Debt (Details Textual) - USD ($) $ in Millions		12 Months Ended			19 Months Ended
	Dec. 07, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2023
Long-Term Debt, Gross		$ 3,732.7	$ 3,258.9		$ 3,732.7
Interest Paid, Capitalized, Investing Activities		8.6	4.5	$ 4.4
Stock Issued During Period, Value, New Issues		40.5	50.3
Subsidiaries [Member]
Long-Term Debt, Gross		229.7			229.7
Spire Missouri [Member]
Long-Term Debt, Gross		1,798.0	1,648.0		1,798.0
Interest Paid, Capitalized, Investing Activities		3.1	0.6	0.2
Regulatory Preferred Stock and Debt Securities Issuance Amount Authorized		800.0			800.0
Stock Issued During Period, Value, New Issues		38.7	51.1
Spire Missouri [Member] | Universal Shelf Registration [Member]
Stock Issued During Period, Value, New Issues		79.1			79.1
Spire Missouri [Member] | First Mortgage Bonds Due December Two Two Thousand Twenty Four [Member]
Long-Term Debt, Gross	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Spire Missouri [Member] | First Mortgage Bonds Due December Two Two Thousand Twenty Four [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Spire Missouri [Member] | Floating Rate Series Due December 2, 2024 [Member]
Long-Term Debt, Gross		300.0			300.0
Spire Missouri [Member] | First Mortgage Bond [Member]
Debt Instrument, Face Amount		400.0			400.0
Spire Alabama Inc [Member]
Long-Term Debt, Gross		750.0	575.0		$ 750.0
Interest Paid, Capitalized, Investing Activities		$ 2.3	$ 3.2	$ 3.2

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Note 6 - Long-term Debt - Composition of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Total principal of long-term debt	$ 3,732.7	$ 3,258.9
Less: Unamortized discounts and debt issuance costs	(22.1)	(19.2)
Less: Current portion	(156.6)	(281.2)
Long-term debt (less current portion)	3,554.0	2,958.5
Spire Missouri [Member]
Total principal of long-term debt	1,798.0	1,648.0
Less: Unamortized discounts and debt issuance costs	(12.6)	(10.3)
Less: Current portion	0.0	(250.0)
Long-term debt (less current portion)	1,785.4	1,387.7
Spire Alabama Inc [Member]
Total principal of long-term debt	750.0	575.0
Less: Unamortized discounts and debt issuance costs	(4.1)	(3.5)
Long-term debt (less current portion)	745.9	571.5
First Mortgage Bonds Three Point Four Percentage Series Due August152023 [Member] | Spire Missouri [Member]
Total principal of long-term debt	0.0	250.0
Floating Rate Series Due December 2, 2024 [Member] | Spire Missouri [Member]
Total principal of long-term debt	300.0
First Mortgage Bonds Three Point Four Percentage Series Due March152028 [Member] | Spire Missouri [Member]
Total principal of long-term debt	45.0	45.0
First Mortgage Bonds Seven Percentage Series Due June12029 [Member] | Spire Missouri [Member]
Total principal of long-term debt	19.3	19.3
First Mortgage Bonds Two Point Eight Four Percentage Series Due November152029 [Member] | Spire Missouri [Member]
Total principal of long-term debt	275.0	275.0
First Mortgage Bonds Seven Point Nine Percentage Series Due September152030 [Member] | Spire Missouri [Member]
Total principal of long-term debt	30.0	30.0
First Mortgage Bonds Three Point Six Eight Percentage Series Due September152032 [Member] | Spire Missouri [Member]
Total principal of long-term debt	50.0	50.0
First Mortgage Bonds Four Point Eight Zero Percentage Series Due February 152033 [Member] | Spire Missouri [Member]
Total principal of long-term debt	400.0	0.0
First Mortgage Bonds Six Percentage Series Due May12034 [Member] | Spire Missouri [Member]
Total principal of long-term debt	99.3	99.3
First Mortgage Bonds Six Point One Five Percentage Series Due June12036 [Member] | Spire Missouri [Member]
Total principal of long-term debt	54.5	54.5
First Mortgage Bonds Four Point Six Three Percentage Series Due August152043 [Member] | Spire Missouri [Member]
Total principal of long-term debt	99.9	99.9
First Mortgage Bonds Four Point Two Three Percentage Series Due September152047 [Member] | Spire Missouri [Member]
Total principal of long-term debt	70.0	70.0
First Mortgage Bonds Three Point Three Zero Percentage Series Due June12051 [Member] | Spire Missouri [Member]
Total principal of long-term debt	305.0	305.0
First Mortgage Bonds Four Point Three Eight Percentage Series Due September152057 [Member] | Spire Missouri [Member]
Total principal of long-term debt	50.0	50.0
Three Point Two One Percentage Notes Due September152025 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	35.0	35.0
Five Point Three Two Percentage Notes Due October152029 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	90.0	0.0
Two Point Eight Eight Percentage Notes Due December12029 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	100.0	100.0
Two Point Zero Four Percentage Notes Due December152030 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	150.0	150.0
Five Point Four One Percentage Notes Due October152032[Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	85.0	0.0
Five Point Nine Zero Percentage Notes Due January152037 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	45.0	45.0
Four Point Three One Percentage Notes Due December12045 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	80.0	80.0
Three Point Nine Two Percentage Notes Due January152048 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	45.0	45.0
Four Point Six Four Percentage Notes Due January152049 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	90.0	90.0
Four Point Zero Two Percentage Notes Due January152058 [Member] | Spire Alabama Inc [Member]
Total principal of long-term debt	30.0	30.0
Parent Company [Member] | Three Point Three One Percent Notes Payable Due December152022 [Member]
Total principal of long-term debt	0.0	25.0
Parent Company [Member] | Three Point Five Four Percent Senior Notes Due February272024 [Member]
Total principal of long-term debt	150.0	150.0
Parent Company [Member] | Zero Point Seven Five Percent Remarketable Senior Notes Due March12026 [Member]
Total principal of long-term debt	175.0	175.0
Parent Company [Member] | Three Point One Three Percent Senior Notes Due September12026 [Member]
Total principal of long-term debt	130.0	130.0
Parent Company [Member] | Three Point Nine Three Percent Senior Notes Due March152027 [Member]
Total principal of long-term debt	100.0	100.0
Parent Company [Member] | Five Point Eight Percent Senior Notes Due March152033 [Member]
Total principal of long-term debt	150.0	0.0
Parent Company [Member] | Four Point Seven Zero Percent Senior Notes Due August152044 [Member]
Total principal of long-term debt	250.0	250.0
Subsidiaries [Member]
Total principal of long-term debt	229.7
Subsidiaries [Member] | Five Point Zero Zero Percent First Mortgage Bonds Due September302031 [Member]
Total principal of long-term debt	42.0	42.0
Subsidiaries [Member] | Two Nine Five Percent Notes With Annual Principal Payments Through December2034 [Member]
Total principal of long-term debt	117.7	123.9
Subsidiaries [Member] | Five Point Six One Percent First Mortgage Bonds Due October 152037 [Member]
Total principal of long-term debt	30.0	0.0
Subsidiaries [Member] | Three Point Five Two Percent First Mortgage Bonds Due September302049 [Member]
Total principal of long-term debt	$ 40.0	$ 40.0

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Note 6 - Long-term Debt - Composition of Long-term Debt (Details) (Parentheticals)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
First Mortgage Bonds Three Point Four Percentage Series Due August152023 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	3.40%	3.40%
Debt Instrument Maturity Date	Aug. 15, 2023	Aug. 15, 2023
Floating Rate Series Due December 2, 2024 [Member] | Spire Missouri [Member]
Debt Instrument Maturity Date	Dec. 02, 2024
First Mortgage Bonds Three Point Four Percentage Series Due March152028 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	3.40%	3.40%
Debt Instrument Maturity Date	Mar. 15, 2028	Mar. 15, 2028
First Mortgage Bonds Seven Percentage Series Due June12029 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	7.00%	7.00%
Debt Instrument Maturity Date	Jun. 01, 2029	Jun. 01, 2029
First Mortgage Bonds Two Point Eight Four Percentage Series Due November152029 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	2.84%	2.84%
Debt Instrument Maturity Date	Nov. 15, 2029	Nov. 15, 2029
First Mortgage Bonds Seven Point Nine Percentage Series Due September152030 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	7.90%	7.90%
Debt Instrument Maturity Date	Sep. 15, 2030	Sep. 15, 2030
First Mortgage Bonds Three Point Six Eight Percentage Series Due September152032 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	3.68%	3.68%
Debt Instrument Maturity Date	Sep. 15, 2032	Sep. 15, 2032
First Mortgage Bonds Four Point Eight Zero Percentage Series Due February 152033 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	4.80%	4.80%
Debt Instrument Maturity Date	Feb. 15, 2033	Feb. 15, 2033
First Mortgage Bonds Six Percentage Series Due May12034 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	6.00%	6.00%
Debt Instrument Maturity Date	May 01, 2034	May 01, 2034
First Mortgage Bonds Six Point One Five Percentage Series Due June12036 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	6.15%	6.15%
Debt Instrument Maturity Date	Jun. 01, 2036	Jun. 01, 2036
First Mortgage Bonds Four Point Six Three Percentage Series Due August152043 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	4.63%	4.63%
Debt Instrument Maturity Date	Aug. 15, 2043	Aug. 15, 2043
First Mortgage Bonds Four Point Two Three Percentage Series Due September152047 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	4.23%	4.23%
Debt Instrument Maturity Date	Sep. 15, 2047	Sep. 15, 2047
First Mortgage Bonds Three Point Three Zero Percentage Series Due June12051 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	3.30%	3.30%
Debt Instrument Maturity Date	Jun. 01, 2051	Jun. 01, 2051
First Mortgage Bonds Four Point Three Eight Percentage Series Due September152057 [Member] | Spire Missouri [Member]
Debt Instrument Interest Rate	4.38%	4.38%
Debt Instrument Maturity Date	Sep. 15, 2057	Sep. 15, 2057
Three Point Two One Percentage Notes Due September152025 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	3.21%	3.21%
Debt Instrument Maturity Date	Sep. 15, 2025	Sep. 15, 2025
Five Point Three Two Percentage Notes Due October152029 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	5.32%	5.32%
Debt Instrument Maturity Date	Oct. 15, 2029	Oct. 15, 2029
Two Point Eight Eight Percentage Notes Due December12029 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	2.88%	2.88%
Debt Instrument Maturity Date	Dec. 01, 2029	Dec. 01, 2029
Two Point Zero Four Percentage Notes Due December152030 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	2.04%	2.04%
Debt Instrument Maturity Date	Dec. 15, 2030	Dec. 15, 2030
Five Point Four One Percentage Notes Due October152032[Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	5.41%	5.41%
Debt Instrument Maturity Date	Oct. 15, 2032	Oct. 15, 2032
Five Point Nine Zero Percentage Notes Due January152037 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	5.90%	5.90%
Debt Instrument Maturity Date	Jan. 15, 2037	Jan. 15, 2037
Four Point Three One Percentage Notes Due December12045 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	4.31%	4.31%
Debt Instrument Maturity Date	Dec. 01, 2045	Dec. 01, 2045
Three Point Nine Two Percentage Notes Due January152048 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	3.92%	3.92%
Debt Instrument Maturity Date	Jan. 15, 2048	Jan. 15, 2048
Four Point Six Four Percentage Notes Due January152049 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	4.64%	4.64%
Debt Instrument Maturity Date	Jan. 15, 2049	Jan. 15, 2049
Four Point Zero Two Percentage Notes Due January152058 [Member] | Spire Alabama Inc [Member]
Debt Instrument Interest Rate	4.02%	4.02%
Debt Instrument Maturity Date	Jan. 15, 2058	Jan. 15, 2058
Parent Company [Member] | Three Point Three One Percent Notes Payable Due December152022 [Member]
Debt Instrument Interest Rate	3.31%	3.31%
Debt Instrument Maturity Date	Dec. 15, 2022	Dec. 15, 2022
Parent Company [Member] | Three Point Five Four Percent Senior Notes Due February272024 [Member]
Debt Instrument Interest Rate	3.54%	3.54%
Debt Instrument Maturity Date	Feb. 27, 2024	Feb. 27, 2024
Parent Company [Member] | Zero Point Seven Five Percent Remarketable Senior Notes Due March12026 [Member]
Debt Instrument Interest Rate	0.75%	0.75%
Debt Instrument Maturity Date	Mar. 01, 2026	Mar. 01, 2026
Parent Company [Member] | Three Point One Three Percent Senior Notes Due September12026 [Member]
Debt Instrument Interest Rate	3.13%	3.13%
Debt Instrument Maturity Date	Sep. 01, 2026	Sep. 01, 2026
Parent Company [Member] | Three Point Nine Three Percent Senior Notes Due March152027 [Member]
Debt Instrument Interest Rate	3.93%	3.93%
Debt Instrument Maturity Date	Mar. 15, 2027	Mar. 15, 2027
Parent Company [Member] | Five Point Eight Percent Senior Notes Due March152033 [Member]
Debt Instrument Interest Rate	5.80%	5.80%
Debt Instrument Maturity Date	Mar. 15, 2033	Mar. 15, 2033
Parent Company [Member] | Four Point Seven Zero Percent Senior Notes Due August152044 [Member]
Debt Instrument Interest Rate	4.70%	4.70%
Debt Instrument Maturity Date	Aug. 15, 2044	Aug. 15, 2044
Subsidiaries [Member] | Five Point Zero Zero Percent First Mortgage Bonds Due September302031 [Member]
Debt Instrument Interest Rate	5.00%	5.00%
Debt Instrument Maturity Date	Sep. 30, 2031	Sep. 30, 2031
Subsidiaries [Member] | Two Nine Five Percent Notes With Annual Principal Payments Through December2034 [Member]
Debt Instrument Interest Rate	2.95%	2.95%
Debt Instrument Maturity Date	Dec. 31, 2034	Dec. 31, 2034
Subsidiaries [Member] | Five Point Six One Percent First Mortgage Bonds Due October 152037 [Member]
Debt Instrument Interest Rate	5.61%	5.61%
Debt Instrument Maturity Date	Oct. 15, 2037	Oct. 15, 2037
Subsidiaries [Member] | Three Point Five Two Percent First Mortgage Bonds Due September302049 [Member]
Debt Instrument Interest Rate	3.52%	3.52%
Debt Instrument Maturity Date	Sep. 30, 2049	Sep. 30, 2049

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Note 6 - Long-term Debt - Maturities of Long-term Debt (Details) $ in Millions	Sep. 30, 2023 USD ($)
2023	$ 156.6
2024	342.0
2025	312.5
2026	108.1
2027	53.6
Spire Missouri [Member]
2023	0.0
2024	300.0
2025	0.0
2026	0.0
2027	45.0
Spire Alabama Inc [Member]
2023	0.0
2024	35.0
2025	0.0
2026	0.0
2027	$ 0.0

XML

Note 7 - Notes Payable and Credit Agreements (Details Textual) - USD ($) $ in Thousands	Jan. 05, 2023	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2021
Commercial Paper [Member] | Parent Company [Member]
Short Term Borrowings Used to Support Lending to Utilities		$ 706,900
Spire Missouri [Member] | Unsecured Term Loan [Member]
Debt Instrument, Face Amount				$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	0.10%
Spire Missouri [Member] | Unsecured Term Loan [Member] | London Interbank Offered Rate LIBOR 1 [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization		65.00%
Debt Instrument, Basis Spread on Variable Rate	0.80%
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,300,000
Long-Term Line of Credit		$ 0	$ 0
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization		70.00%
Revolving Credit Facility [Member] | Spire [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 450,000
Revolving Credit Facility [Member] | Spire Missouri [Member]
Line of Credit Facility, Maximum Borrowing Capacity		575,000
Revolving Credit Facility [Member] | Spire Alabama Inc [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 275,000

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Note 7 - Notes Payable and Credit Agreements - Short-term Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Term Loan [Member] | Spire Missouri [Member]
Highest borrowings outstanding	$ 656.9
Lowest borrowings outstanding	3.8
Weighted average borrowings	$ 327.9
Weighted average interest rate	4.90%
Borrowings outstanding	$ 540.6	$ 445.3
Weighted average interest rate	5.60%
Spire Note [Member] | Spire Missouri [Member]
Highest borrowings outstanding	$ 274.0
Lowest borrowings outstanding	76.7
Weighted average borrowings	$ 119.1
Weighted average interest rate	4.90%
Borrowings outstanding	$ 124.1	$ 260.9
Weighted average interest rate	5.60%	3.30%
Spire Note [Member] | Spire Alabama Inc [Member]
Highest borrowings outstanding	$ 1,482.0
Lowest borrowings outstanding	489.0
Weighted average borrowings	$ 843.1
Weighted average interest rate	5.00%
Borrowings outstanding	$ 955.5	$ 1,037.5
Weighted average interest rate	5.60%	3.30%
Parent Company [Member] | Term Loan [Member]
Highest borrowings outstanding	$ 250.0
Lowest borrowings outstanding	0.0
Weighted average borrowings	$ 66.8
Weighted average interest rate	5.50%
Borrowings outstanding	$ 0.0	$ 0.0
Weighted average interest rate		0.00%
Parent Company [Member] | Commercial Paper [Member]
Highest borrowings outstanding	1,282.0
Lowest borrowings outstanding	354.4
Weighted average borrowings	$ 776.3
Weighted average interest rate	5.00%
Borrowings outstanding	$ 955.5	$ 1,037.5
Weighted average interest rate	5.60%	3.30%

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Note 8 - Fair Value of Financial Instruments - Estimated Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Reported Value Measurement [Member]
Cash and cash equivalents	$ 5.6	$ 6.5
Notes payable	955.5	1,037.5
Long-term debt, including current portion	3,710.6	3,239.7
Reported Value Measurement [Member] | Spire Missouri [Member]
Cash and cash equivalents	0.8
Long-term debt, including current portion	1,785.4	1,637.7
Notes payable - associated companies	540.6	445.3
Reported Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1.2	2.4
Long-term debt, including current portion	745.9	571.5
Notes payable - associated companies	124.1	260.9
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	5.6	6.5
Notes payable	955.5	1,037.5
Long-term debt, including current portion	3,270.2	2,851.8
Estimate of Fair Value Measurement [Member] | Spire Missouri [Member]
Cash and cash equivalents	0.8
Long-term debt, including current portion	1,592.4	1,473.9
Notes payable - associated companies	540.6	445.3
Estimate of Fair Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1.2	2.4
Long-term debt, including current portion	648.0	485.0
Notes payable - associated companies	124.1	260.9
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	5.6	6.5
Notes payable	0.0	0.0
Long-term debt, including current portion	0.0	0.0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Cash and cash equivalents	0.8
Long-term debt, including current portion	0.0	0.0
Notes payable - associated companies	0.0	0.0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1.2	2.4
Long-term debt, including current portion	0.0	0.0
Notes payable - associated companies	0.0	0.0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0.0	0.0
Notes payable	955.5	1,037.5
Long-term debt, including current portion	3,270.2	2,851.8
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Cash and cash equivalents	0.0
Long-term debt, including current portion	1,592.4	1,473.9
Notes payable - associated companies	540.6	445.3
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	0.0	0.0
Long-term debt, including current portion	648.0	485.0
Notes payable - associated companies	$ 124.1	$ 260.9

XML

Note 9 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Derivative Assets	$ 77.3	$ 116.2
Derivative Liabilities	30.8	61.5
Fair Value, Recurring [Member]
Effects of netting, asset	(20.1)	(153.6)
Derivative Assets	135.3	164.6
Effects of netting, liability	(69.4)	(117.0)
Derivative Liabilities	30.8	61.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	74.4	198.0
Derivative Liability Fair Value Gross Liability	72.6	113.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	81.0	120.2
Derivative Liability Fair Value Gross Liability	27.6	65.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	20.4	19.1
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	37.6	29.3
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	20.4	19.1
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	37.6	29.3
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	(0.1)
Derivative Assets	0.0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.1
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	(6.3)	(57.8)
Derivative Assets	0.0	0.0
Effects of netting, liability	(44.0)	(30.7)
Derivative Liabilities	6.8	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(10.1)	(91.8)
Derivative Assets	0.0	0.0
Effects of netting, liability	(21.8)	(82.3)
Derivative Liabilities	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	6.3	57.8
Derivative Liability Fair Value Gross Liability	50.8	30.7
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	10.1	91.8
Derivative Liability Fair Value Gross Liability	21.8	82.3
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(3.6)	(4.0)
Derivative Assets	33.1	52.6
Effects of netting, liability	(3.6)	(4.0)
Derivative Liabilities	24.0	61.5
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	36.7	56.6
Derivative Liability Fair Value Gross Liability	27.6	65.5
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	44.2	63.6
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	44.2	63.6
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member]
Derivative Assets	0.0	0.0
Derivative Liabilities	6.8	0.0
Spire Missouri [Member] | Fair Value, Recurring [Member]
Effects of netting, asset	(6.4)	(57.8)
Derivative Assets	20.4	19.1
Spire Missouri [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	26.7	76.9
Spire Missouri [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.1	0.0
Spire Missouri [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] | U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	20.4	19.1
Spire Missouri [Member] | U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.4	19.1
Spire Missouri [Member] | U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] | U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member]
Effects of netting, asset	(0.1)
Derivative Assets	0.0
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.0
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.1
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0
Spire Missouri [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member]
Effects of netting, asset	(6.3)	(57.8)
Derivative Assets	0.0	0.0
Effects of netting, liability	(44.0)	(30.7)
Derivative Liabilities	6.8	0.0
Spire Missouri [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	6.3	57.8
Derivative Liability Fair Value Gross Liability	50.8	30.7
Spire Missouri [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Spire Missouri [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	$ 0.0	$ 0.0

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Note 10 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) MMBoe	Sep. 30, 2022 USD ($)
Nonmonetary Notional Amount of Natural Gas Derivative Contracts Not Designated As Normal Purchases Or Normal Sales (Millions of Barrels of Oil Equivalent)		567,000,000
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Next Twelve Months (Millions of Barrels of Oil Equivalent)		379.1
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Two (Millions of Barrels of Oil Equivalent)		151.1
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Three (Millions of Barrels of Oil Equivalent)		26.4
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Four (Millions of Barrels of Oil Equivalent)		3.8
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Five (Millions of Barrels of Oil Equivalent)		6.6
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | $		$ 44,200
Other Receivable from Broker-Dealer and Clearing Organization | $		$ 0	$ 49,800
Forecast [Member]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $	$ 2,800
Spire Missouri [Member]
Nonmonetary Notional Amount of Other Price Mitigation in Place Not Designated As Normal Purchases Or Normal Sales (Millions of Barrels of Oil Equivalent)		16,300,000
Other Receivable from Broker-Dealer and Clearing Organization | $		$ 0	$ 24,000

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Note 10 - Derivative Instruments and Hedging Activities - Interest Swap Contracts (Details) - Cash Flow Hedging [Member] $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($)
Interest Rate Swap Agreement One [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 50.0
Derivative, fixed interest rate	1.4918%
Derivative, mark-to-market gain	$ 2.7
Interest Rate Swap Agreement Two [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 75.0
Derivative, fixed interest rate	1.6475%
Derivative, mark-to-market gain	$ 4.0
Interest Rate Swap Agreement Three [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 25.0
Derivative, fixed interest rate	1.746%
Derivative, mark-to-market gain	$ 1.5
Interest Rate Swap Agreement Four [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 50.0
Derivative, fixed interest rate	3.448%
Derivative, mark-to-market gain	$ 2.4
Interest Rate Swap Agreement Five [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 50.0
Derivative, fixed interest rate	3.685%
Derivative, mark-to-market gain	$ 0.9
Interest Rate Swap Agreement Six [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 25.0
Derivative, fixed interest rate	3.535%
Derivative, mark-to-market gain	$ 0.5
Interest Rate Swap Agreement Seven [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 25.0
Derivative, fixed interest rate	3.385%
Derivative, mark-to-market gain	$ 0.6
Interest Rate Swap Agreement Eight [Member]
Derivative, hedge term (Year)	30 years
Derivative, notional amount	$ 50.0
Derivative, fixed interest rate	2.747%
Derivative, mark-to-market gain	$ 7.8
Interest Rate Swap Agreement Nine [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 25.0
Derivative, fixed interest rate	2.902%
Derivative, mark-to-market gain	$ 2.2
Interest Rate Swap Agreement Ten [Member]
Derivative, hedge term (Year)	10 years
Derivative, notional amount	$ 25.0
Derivative, fixed interest rate	3.018%
Derivative, mark-to-market gain	$ 2.0
Interest Rate Swap [Member]
Derivative, notional amount	400.0
Derivative, mark-to-market gain	$ 24.6

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Note 10 - Derivative Instruments and Hedging Activities - Summary of NYMEX and ICE Natural Gas Futures and Swap Positions (Details) - MMBTU MMBTU in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Natural Gas Futures Purchased [Member] | Spire Missouri [Member]
Notional Amount, Energy Measure (Millions of British Thermal Unit)	66.5	13.0
Derivative, hedge term (Year)	24 months	12 months
Natural Gas Futures Purchased [Member] | Gas Marketing [Member]
Notional Amount, Energy Measure (Millions of British Thermal Unit)	61.3	76.3
Derivative, hedge term (Year)	51 months	54 months
Natural Gas Futures Purchased [Member] | Gas Utility [Member]
Notional Amount, Energy Measure (Millions of British Thermal Unit)	66.5	13.0
Derivative, hedge term (Year)	24 months	12 months
Natural Gas Options Purchased Net [Member] | Gas Marketing [Member]
Notional Amount, Energy Measure (Millions of British Thermal Unit)	4.9	3.7
Derivative, hedge term (Year)	15 months	12 months
Natural Gas Basis Swaps Purchased [Member] | Gas Marketing [Member]
Notional Amount, Energy Measure (Millions of British Thermal Unit)	44.1	61.7
Derivative, hedge term (Year)	51 months	39 months

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Note 10 - Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Net hedging gain arising during the period		$ 20.1	$ 56.7	$ 61.2
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Comprehensive Income (Loss) [Member]
Net hedging gain arising during the period		(16.7)	95.9	(23.4)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member]
Net hedging gain arising during the period		20.1	56.7	61.2
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Effective portion of (loss) gain reclassified from AOCI to income:		(2.4)	(1.2)	(1.3)
Not Designated as Hedging Instrument [Member] | Gasoline And Heating Oil Contracts [Member] | Non Regulated Gas Marketing Operating Revenue [Member]
Derivatives Not Designated as Hedging Instrument		0.3	0.0	0.0
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Non Regulated Gas Marketing Operating Revenue [Member]
Derivatives Not Designated as Hedging Instrument	[1]	18.0	52.6	54.1
Not Designated as Hedging Instrument [Member] | N Y M E X And I C E Natural Gas Contracts [Member] | Non Regulated Gas Marketing Operating Revenue [Member]
Derivatives Not Designated as Hedging Instrument	[1]	$ (35.0)	$ 43.3	$ (77.5)

[1] Gains and losses on Spire Missouri’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Missouri Utilities’ PGA clauses and initially recorded as regulatory assets or regulatory liabilities. These gains and losses are excluded from the table above because they have no direct impact on the statements of income. Such amounts are recognized in the statements of income as a component of natural gas operating expenses when they are recovered through the PGA clause and reflected in customer billings.

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Note 10 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022
Fair value of derivative assets presented above		$ 97.4	$ 269.8
Fair Value Of Derivative Liability	[1]	100.2	178.5
Spire Missouri [Member]
Fair value of derivative assets presented above		6.4	57.8
Fair Value Of Derivative Liability		50.8	30.7
Designated as Hedging Instrument [Member]
Fair value of derivative assets presented above		44.2	63.6
Fair Value Of Derivative Liability	[1]	0.0	0.0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Derivative Instruments Assets [Member] | Corporate, Non-Segment [Member]
Fair value of derivative assets presented above		44.2
Fair Value Of Derivative Liability	[1]	0.0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Derivative Instruments Liability [Member] | Corporate, Non-Segment [Member]
Fair value of derivative assets presented above			63.6
Fair Value Of Derivative Liability	[1]		0.0
Not Designated as Hedging Instrument [Member]
Fair value of derivative assets presented above		53.2	206.2
Fair Value Of Derivative Liability	[1]	100.2	178.5
Not Designated as Hedging Instrument [Member] | Gas Utility [Member] | Spire Missouri [Member]
Fair value of derivative assets presented above		6.4
Fair Value Of Derivative Liability		50.8
Not Designated as Hedging Instrument [Member] | N Y M E X Natural Gas Contracts [Member] | Accounts Receivable Other [Member] | Gas Utility [Member] | Spire Missouri [Member]
Fair value of derivative assets presented above		6.3	57.8
Fair Value Of Derivative Liability	[2]	50.8	30.7
Not Designated as Hedging Instrument [Member] | N Y M E X Natural Gas Contracts [Member] | Accounts Receivable Other [Member] | Operating Segments [Member] | Gas Utility [Member]
Fair value of derivative assets presented above		6.3	57.8
Fair Value Of Derivative Liability	[1]	50.8	30.7
Not Designated as Hedging Instrument [Member] | Gasoline And Heating Oil Contracts [Member] | Accounts Receivable Other [Member] | Gas Utility [Member] | Spire Missouri [Member]
Fair value of derivative assets presented above		0.1
Not Designated as Hedging Instrument [Member] | Gasoline And Heating Oil Contracts [Member] | Accounts Receivable Other [Member] | Operating Segments [Member] | Gas Utility [Member]
Fair value of derivative assets presented above		0.1
Fair Value Of Derivative Liability		0.0
Not Designated as Hedging Instrument [Member] | N Y M E X And I C E Natural Gas Contracts [Member] | Derivative Instruments Liability [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above		8.0
Fair Value Of Derivative Liability	[1]	16.0
Not Designated as Hedging Instrument [Member] | N Y M E X And I C E Natural Gas Contracts [Member] | Other Deferred Charges [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above		2.1
Fair Value Of Derivative Liability	[1]	5.7
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Derivative Instruments Assets [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above		31.2	53.4
Fair Value Of Derivative Liability	[1]		55.1
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Other Deferred Charges [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above		5.5	3.1
Fair Value Of Derivative Liability	[1]		10.4
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Other Current Liabilities [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair Value Of Derivative Liability	[1]	20.1
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Deferred Credits And Other Liabilities [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair Value Of Derivative Liability	[1]	$ 7.6
Not Designated as Hedging Instrument [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Derivative Instruments Assets [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above			79.2
Fair Value Of Derivative Liability	[1]		71.5
Not Designated as Hedging Instrument [Member] | N Y M E X I C E Natural Gas Contracts [Member] | Other Deferred Charges [Member] | Operating Segments [Member] | Gas Marketing [Member]
Fair value of derivative assets presented above			12.7
Fair Value Of Derivative Liability	[1]		$ 10.8

[1] The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

[2] The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the Balance Sheets. As such, the gross balances presented in the table above are not indicative of Spire Missouri’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

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Note 10 - Derivative Instruments and Hedging Activities - Reconciliation of Amounts in the Consolidated Balance Sheet (Details) - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022
Fair value of derivative assets presented above		$ 97.4	$ 269.8
Fair value of cash margin receivable offset with derivatives		49.3	(36.6)
Netting of assets and liabilities with the same counterparty		(69.4)	(117.0)
Total		77.3	116.2
Derivative Assets		77.3	116.2
Fair value of derivative liabilities presented above	[1]	100.2	178.5
Netting of assets and liabilities with the same counterparty		(69.4)	(117.0)
Total		30.8	61.5
Derivative Liabilities		30.8	61.5
Other Current Assets [Member]
Total		71.8	113.1
Derivative Assets		71.8	113.1
Deferred Charges and Other Assets, Other [Member]
Total		5.5	3.1
Derivative Assets		5.5	3.1
Other Current Liabilities [Member]
Total		23.2	51.1
Derivative Liabilities		23.2	51.1
Deferred Credits And Other Liabilities [Member]
Total		7.6	10.4
Derivative Liabilities		7.6	10.4
Spire Missouri [Member]
Fair value of derivative assets presented above		6.4	57.8
Netting of assets and liabilities with the same counterparty		(44.0)	(30.7)
Total		0.0	0.0
Derivative Assets		0.0	0.0
Fair value of derivative liabilities presented above		50.8	30.7
Netting of assets and liabilities with the same counterparty		(44.0)	(30.7)
Total		6.8	0.0
Derivative Liabilities		6.8	0.0
Fair value of cash margin (payable) receivable offset with derivatives		$ 37.6	$ (27.1)

[1] The fair values of Derivative Assets and Derivative Liabilities exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the balance sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 9, Fair Value Measurements, for information on the valuation of derivative instruments.

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Note 11 - Concentrations of Credit Risk (Details Textual) Pure in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($)
Customer Concentration Risk [Member] | Utility Companies and Their Marketing Affiliates [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 53.4
Customer Concentration Risk [Member] | Five Largest Counterparties [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 26.7
Gas Utility [Member]
Number of Customer Serves	1.7

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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 5,900	$ 4,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0	0
Spire Missouri [Member]
Regulatory Order, Excess Deferred Income Tax Returned to Customers	10,000	9,900	$ 8,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,100	3,700
Unrecognized Tax Benefits	22,900	19,300	16,100	$ 13,000
Spire Gulf [Member]
Regulatory Order, Excess Deferred Income Tax Returned to Customers	3,100
Spire Mississippi [Member]
Regulatory Order, Excess Deferred Income Tax Returned to Customers	100
Spire Alabama Inc [Member]
Regulatory Order, Excess Deferred Income Tax Returned to Customers	200
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	300	0
Unrecognized Tax Benefits	$ 300	$ 0	$ 0	$ 0

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Note 12 - Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Total income tax expense	$ 38.8	$ 58.9	$ 68.5
Spire Missouri [Member]
Current	0.0	0.0	0.0
Deferred	10.1	18.2	22.0
Investment tax credits	(0.2)	(0.2)	(0.2)
Current	0.0	0.0	0.0
Deferred	1.7	3.3	3.5
Total income tax expense	11.6	21.3	25.3
Spire Alabama Inc [Member]
Current	0.0	0.0	0.0
Deferred	15.8	18.1	19.8
Investment tax credits	0.0	0.0	0.0
Current	0.0	0.0	0.0
Deferred	4.5	5.1	5.2
Total income tax expense	20.3	23.2	25.0
Parent Company [Member]
Current	0.7	0.5	0.2
Deferred	30.4	47.0	49.5
Investment tax credits	(0.2)	(0.2)	(0.2)
Current	1.2	0.5	1.3
Deferred	6.7	11.1	17.7
Total income tax expense	$ 38.8	$ 58.9	$ 68.5

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Note 12 - Income Taxes - Effective Income Tax Rate (Details)		12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Spire Missouri [Member]
Federal income tax statutory rate		21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax benefits		2.60%	2.60%	2.60%
Certain expenses capitalized on books and deducted on tax return		(2.70%)	(3.20%)	(3.30%)
Taxes related to prior years			(0.60%)	(0.20%)
Tax credits *		(4.20%)	0.00%	0.00%
Amortization of excess deferred taxes		(7.70%)	(7.30%)	(5.00%)
Other items – net **	[1]	0.00%	3.10%	(0.20%)
Effective income tax rate		9.00%	15.60%	14.90%
Spire Alabama Inc [Member]
Federal income tax statutory rate		21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax benefits		4.10%	4.10%	4.10%
Certain expenses capitalized on books and deducted on tax return		0.00%	0.00%	0.00%
Taxes related to prior years		0.00%	0.00%	0.00%
Tax credits *		(1.90%)	0.00%	0.00%
Amortization of excess deferred taxes		0.20%	0.00%	0.00%
Other items – net **	[1]	0.10%	0.20%	0.20%
Effective income tax rate		23.50%	25.30%	25.30%
Parent Company [Member]
Federal income tax statutory rate		21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax benefits		3.70%	3.60%	3.60%
Certain expenses capitalized on books and deducted on tax return		(1.40%)	(1.60%)	(1.60%)
Taxes related to prior years		0.00%	(0.30%)	(0.50%)
Tax credits *		(3.30%)	0.00%	0.00%
Amortization of excess deferred taxes		(5.10%)	(3.50%)	(2.50%)
Other items – net **	[1]	0.20%	1.90%	0.10%
Effective income tax rate		15.10%	21.10%	20.10%

[1] Other consists primarily of property adjustments.

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Note 12 - Income Taxes - Significant Items Comprising the Net Deferred Tax Liability or Asset (Details) - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022
Reserves not currently deductible		$ 27.7	$ 33.5
Pension and other postretirement benefits		64.4	72.6
Goodwill		0.0	0.0
Operating losses		239.2	255.1
Regulatory amount due to customers, net		30.4	34.5
Other		35.8	24.9
Total deferred tax assets		397.5	420.6
Relating to property		(788.0)	(740.0)
Regulatory pension and other postretirement benefits		(80.6)	(92.8)
Deferred gas costs		(67.0)	(75.8)
Other ***	[1]	(205.6)	(187.1)
Total deferred tax liabilities		(1,141.2)	(1,095.7)
Net deferred tax (liability) asset		(743.7)	(675.1)
Spire Missouri [Member]
Reserves not currently deductible		0.0	4.0
Pension and other postretirement benefits		44.7	52.6
Goodwill		0.0	0.0
Operating losses		89.2	116.9
Regulatory amount due to customers, net		27.6	30.7
Other		10.5	0.0
Total deferred tax assets		172.0	204.2
Relating to property		(507.7)	(489.3)
Regulatory pension and other postretirement benefits		(53.0)	(72.3)
Deferred gas costs		(64.1)	(74.0)
Other ***	[1]	(79.0)	(68.7)
Total deferred tax liabilities		(703.8)	(704.3)
Net deferred tax (liability) asset		(531.8)	(500.1)
Spire Alabama Inc [Member]
Reserves not currently deductible		3.9	7.4
Pension and other postretirement benefits		17.0	0.0
Goodwill		58.8	73.0
Operating losses		159.8	140.3
Regulatory amount due to customers, net		0.0	0.0
Other		3.0	0.0
Total deferred tax assets		242.5	220.7
Relating to property		(218.7)	(201.6)
Regulatory pension and other postretirement benefits		(25.9)	(1.6)
Deferred gas costs		0.0	0.0
Other ***	[1]	(7.0)	(6.5)
Total deferred tax liabilities		(251.6)	(209.7)
Net deferred tax (liability) asset		(9.1)
Net deferred tax (liability) asset		$ 0.0	$ 11.0

[1] For Spire, Other consists primarily of goodwill-related liabilities.

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Note 12 - Income Taxes - Summary of Federal and State Loss and Contribution and Tax Credit Carryforwards (Details) $ in Millions	Sep. 30, 2023 USD ($)
Federal and state loss carryforwards	$ 1,000.3
Contribution carryforwards	6.1
Tax credit carryforwards	13.1
Spire Missouri [Member]
Federal and state loss carryforwards	352.4
Contribution carryforwards	5.6
Tax credit carryforwards	8.5
Spire Alabama Inc [Member]
Federal and state loss carryforwards	624.1
Contribution carryforwards	0.0
Tax credit carryforwards	$ 1.6

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Note 12 - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Spire Missouri [Member]
Unrecognized tax benefits, beginning of year	$ 19,300	$ 16,100	$ 13,000
Increases related to tax positions taken in current year	3,600	3,200	3,100
Reductions due to lapse of applicable statute of limitations	0	0	0
Unrecognized tax benefits, end of year	22,900	19,300	16,100
Spire Alabama Inc [Member]
Unrecognized tax benefits, beginning of year	0	0	0
Increases related to tax positions taken in current year	300	0	0
Reductions due to lapse of applicable statute of limitations	0	0	0
Unrecognized tax benefits, end of year	300	0	0
Parent Company [Member]
Unrecognized tax benefits, beginning of year	19,600	16,400	13,200
Increases related to tax positions taken in current year	4,200	3,300	3,200
Reductions due to lapse of applicable statute of limitations	0	(100)	0
Unrecognized tax benefits, end of year	$ 23,800	$ 19,600	$ 16,400

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Note 13 - Pension Plans and Other Postretirement Benefits (Details Textual) - USD ($) $ in Thousands				12 Months Ended
	Dec. 26, 2022	Dec. 23, 2021	Dec. 22, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				$ 0	$ 0
Regulatory Asset, Total				$ 1,597,500	1,467,800
Implementation Period Used To Calculate Return On Plan Assets (Year)				4 years
Gains Or Losses Includible In Cost Amortized To Extent Exceeds Projected Benefit Obligations or Market Related Value of Plan Assets Percentage				10.00%
Regulatory Liability				$ 479,700	421,900
Defined Contribution Plan, Cost				$ 15,500	15,500	$ 15,500
Minimum [Member]
Defined Benefit Plan, Benefit Obligation, Actuarial Gains From Prior Years, Percent				0.50%
Maximum [Member]
Defined Benefit Plan, Benefit Obligation, Actuarial Gains From Prior Years, Percent				0.55%
Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				$ 48,800	$ 109,300
Spire Missouri [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.30%	5.80%
Regulatory Asset, Total				$ 910,700	$ 835,700
Regulatory Liability				389,400	331,800
Defined Contribution Plan, Cost				9,100	$ 10,900	$ 10,900
Spire Missouri [Member] | Pension Costs [Member] | Missouri West [Member]
Regulatory Asset, Total		$ 4,400	$ 5,500
Spire Missouri [Member] | Pension Costs [Member] | Missouri East [Member]
Regulatory Asset, Total	$ 29,900	32,400	29,000
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri West [Member]
Regulatory Liabilities For Which No Return On Investment During Recovery Period Is Provided	800	$ 1,100	$ 3,300
Remaining Recovery Period of Regulatory Liabilities for which No Return on Investment During Recovery Period is Provided (Year)		8 years	8 years
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri East [Member]
Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided	6,900	$ 11,000	$ 21,600
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)			8 years
Additional Remaining Recovery Period of Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided (Year)		8 years
Spire Missouri [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					5.70%
Spire Missouri [Member] | Pension Plan Two [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					5.80%
Spire Missouri [Member] | Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate						3.00%
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				9,900	$ 87,000
Anticipated Contributions to Pension Plans Qualified Trusts				21,600
Anticipated Contributions To Pension Plans Non Qualified Trusts				0
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Anticipated Contributions to Pension Plans Qualified Trusts				0
Postretirement Benefit Plans, Recovery in Rates Base Allowance		$ 8,600
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member] | Missouri West [Member]
Regulatory Liability	100
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member] | Missouri East [Member]
Regulatory Liability	$ 900
Spire Alabama Inc [Member]
Regulatory Asset, Total				648,500	595,100
Regulatory Liability				21,200	23,000
Defined Contribution Plan, Cost				$ 3,100	$ 3,600	$ 2,900
Spire Alabama Inc [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.20%	5.70%	3.10%
Spire Alabama Inc [Member] | Pension Plan Two [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.25%	5.65%	3.00%
Spire Alabama Inc [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				$ 38,800	$ 22,300
Anticipated Contributions to Pension Plans Qualified Trusts				$ 16,400
Spire Alabama Inc [Member] | Pension Plan [Member] | Minimum [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.25%	5.65%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)				11 years 9 months 18 days	11 years 4 months 24 days
Spire Alabama Inc [Member] | Pension Plan [Member] | Maximum [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.20%	5.70%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)				13 years 4 months 24 days	12 years 3 months 18 days
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member]
Anticipated Contributions to Pension Plans Qualified Trusts				$ 0
Spire Alabama And Spire Missouri [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				$ 48,700	$ 109,300
Spire Alabama And Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				6.30%	5.80%

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Note 13 - Pension Plans and Other Postretirement Benefits - Net Pension Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Service cost – benefits earned during the period	$ 16.3	$ 20.0	$ 21.7
Interest cost on projected benefit obligation	25.1	21.5	20.7
Expected return on plan assets	(24.5)	(31.3)	(31.6)
Amortization of prior service credit	(4.5)	(4.5)	(3.1)
Amortization of actuarial loss	6.6	11.9	14.9
Loss on lump-sum settlements and curtailments	9.7	33.6	18.2
Subtotal	28.7	51.2	40.8
Regulatory adjustment	26.3	12.5	20.6
Net pension cost	55.0	63.7	61.4
Pension Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	11.4	14.4	15.4
Interest cost on projected benefit obligation	17.8	14.7	14.2
Expected return on plan assets	(18.0)	(22.7)	(22.5)
Amortization of prior service credit	(1.9)	(1.9)	(0.6)
Amortization of actuarial loss	6.1	9.6	11.0
Loss on lump-sum settlements and curtailments	0.6	27.3	11.6
Subtotal	16.0	41.4	29.1
Regulatory adjustment	27.1	9.9	19.0
Net pension cost	43.1	51.3	48.1
Pension Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	4.2	4.8	5.5
Interest cost on projected benefit obligation	4.8	4.7	4.6
Expected return on plan assets	(3.5)	(5.2)	(5.8)
Amortization of prior service credit	(2.4)	(2.4)	(2.3)
Amortization of actuarial loss	0.9	2.4	3.9
Loss on lump-sum settlements and curtailments	9.1	6.3	6.6
Subtotal	13.1	10.6	12.5
Regulatory adjustment	(1.7)	1.7	0.7
Net pension cost	11.4	12.3	13.2
Other Postretirement Benefits Plan [Member]
Service cost – benefits earned during the period	4.8	7.5	7.3
Interest cost on projected benefit obligation	8.5	6.0	6.0
Expected return on plan assets	(15.8)	(16.8)	(16.1)
Amortization of prior service credit	0.3	1.0	1.0
Amortization of actuarial loss	(4.0)	(2.2)	(1.6)
Subtotal	(6.2)	(4.5)	(3.4)
Regulatory adjustment	0.6	3.3	13.2
Net pension cost	(5.6)	(1.2)	9.8
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	4.0	6.3	6.2
Interest cost on projected benefit obligation	6.5	4.5	4.5
Expected return on plan assets	(10.5)	(11.3)	(10.9)
Amortization of prior service credit	0.6	0.7	0.7
Amortization of actuarial loss	(3.2)	(1.9)	(1.5)
Subtotal	(2.6)	(1.7)	(1.0)
Regulatory adjustment	1.8	5.0	15.0
Net pension cost	(0.8)	3.3	14.0
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	0.7	1.1	0.9
Interest cost on projected benefit obligation	1.8	1.4	1.3
Expected return on plan assets	(5.0)	(5.2)	(4.9)
Amortization of prior service credit	(0.3)	0.3	0.3
Amortization of actuarial loss	(0.5)	0.0	0.0
Subtotal	(3.3)	(2.4)	(2.4)
Regulatory adjustment	(1.3)	(1.8)	(1.8)
Net pension cost	$ (4.6)	$ (4.2)	$ (4.2)

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Note 13 - Pension Plans and Other Postretirement Benefits - Other Changes in Plan Assets and Pension Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Current year actuarial loss (gain)	$ 14.5	$ (16.9)	$ (8.1)
Amortization of actuarial loss	(6.6)	(11.9)	(14.9)
Acceleration of loss recognized due to settlement	(9.7)	(33.6)	(18.2)
Current year service credit	0.0	0.0	(17.9)
Amortization of prior service credit	4.5	4.5	3.1
Subtotal	2.7	(57.9)	(56.0)
Regulatory adjustment	(2.8)	56.3	57.3
Total recognized in OCI	(0.1)	(1.6)	1.3
Pension Plan [Member] | Spire Missouri [Member]
Current year actuarial loss (gain)	5.7	0.9	(0.9)
Amortization of actuarial loss	(6.1)	(9.6)	(11.0)
Acceleration of loss recognized due to settlement	(0.6)	(27.3)	(11.6)
Current year service credit	0.0	0.0	(17.9)
Amortization of prior service credit	1.9	1.9	0.6
Subtotal	0.9	(34.1)	(40.8)
Regulatory adjustment	(1.0)	32.5	42.1
Total recognized in OCI	(0.1)	(1.6)	1.3
Pension Plan [Member] | Spire Alabama Inc [Member]
Current year actuarial loss (gain)	9.0	(16.0)	(1.5)
Amortization of actuarial loss	(0.9)	(2.4)	(3.9)
Acceleration of loss recognized due to settlement	(9.1)	(6.3)	(6.6)
Current year service credit	0.0	0.0	0.0
Amortization of prior service credit	2.4	2.4	2.3
Subtotal	1.4	(22.3)	(9.7)
Regulatory adjustment	(1.4)	22.3	9.7
Total recognized in OCI	0.0	0.0	0.0
Other Postretirement Benefits Plan [Member]
Current year actuarial loss (gain)	(24.4)	15.8	(41.0)
Amortization of actuarial loss	4.0	2.2	1.6
Amortization of prior service credit	(0.3)	(1.0)	(1.0)
Subtotal	(20.7)	10.7	(40.4)
Regulatory adjustment	20.7	(10.7)	40.4
Total recognized in OCI	0.0	0.0	0.0
Current year prior service cost	0.0	(6.3)	0.0
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Current year actuarial loss (gain)	(21.5)	9.8	(29.0)
Amortization of actuarial loss	3.2	1.9	1.5
Amortization of prior service credit	(0.6)	(0.7)	(0.7)
Subtotal	(18.9)	9.9	(28.2)
Regulatory adjustment	18.9	(9.9)	28.2
Total recognized in OCI	0.0	0.0	0.0
Current year prior service cost		(1.1)	0.0
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Current year actuarial loss (gain)	(1.1)	5.9	(9.9)
Amortization of actuarial loss	0.5	0.0	0.0
Amortization of prior service credit	0.3	(0.3)	(0.3)
Subtotal	(0.3)	0.4	(10.2)
Regulatory adjustment	0.3	(0.4)	10.2
Total recognized in OCI	0.0	0.0	0.0
Current year prior service cost	$ 0.0	$ (5.2)	$ 0.0

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Note 13 - Pension Plans and Other Postretirement Benefits - Reconciliation of Pension Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Settlement benefits paid	$ 0	$ 0
Pension Plan [Member]
Benefit obligation, beginning of year	464,400	689,600
Service cost – benefits earned during the period	16,300	20,000	$ 21,700
Interest cost on projected benefit obligation	25,100	21,500	20,700
Actuarial (gain) loss	(1,100)	(173,900)
Settlement loss	9,700	33,400
Settlement benefits paid	(48,800)	(109,300)
Regular benefits paid	(26,900)	(16,900)
Benefit obligation, end of year	438,700	464,400	689,600
Accumulated benefit obligation, end of year	433,100	457,100
Pension Plan [Member] | Spire Missouri [Member]
Benefit obligation, beginning of year	320,600	479,000
Service cost – benefits earned during the period	11,400	14,400	15,400
Interest cost on projected benefit obligation	17,800	14,700	14,200
Actuarial (gain) loss	(4,900)	(116,200)
Settlement loss	600	27,900
Settlement benefits paid	(9,900)	(87,000)
Regular benefits paid	(22,400)	(12,200)
Benefit obligation, end of year	313,200	320,600	479,000
Accumulated benefit obligation, end of year	309,500	315,000
Pension Plan [Member] | Spire Alabama Inc [Member]
Benefit obligation, beginning of year	97,800	149,400
Service cost – benefits earned during the period	4,200	4,800	5,500
Interest cost on projected benefit obligation	4,800	4,700	4,600
Actuarial (gain) loss	5,400	(42,400)
Settlement loss	9,100	5,600
Settlement benefits paid	(38,800)	(22,300)
Regular benefits paid	(1,900)	(2,000)
Benefit obligation, end of year	80,600	97,800	149,400
Accumulated benefit obligation, end of year	78,800	96,200
Other Postretirement Benefits Plan [Member]
Benefit obligation, beginning of year	148,100	204,200
Service cost – benefits earned during the period	4,800	7,500	7,300
Interest cost on projected benefit obligation	8,500	6,000	6,000
Actuarial (gain) loss	(10,600)	(52,600)
Regular benefits paid	(8,400)	(11,000)
Benefit obligation, end of year	142,600	148,100	204,200
Plan amendments	0	(6,200)
Retiree drug subsidy program	200	200
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Benefit obligation, beginning of year	114,800	151,700
Service cost – benefits earned during the period	4,000	6,300	6,200
Interest cost on projected benefit obligation	6,500	4,500	4,500
Actuarial (gain) loss	(13,400)	(37,700)
Regular benefits paid	(6,800)	(9,200)
Benefit obligation, end of year	105,300	114,800	151,700
Plan amendments	0	(1,000)
Retiree drug subsidy program	200	200
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Benefit obligation, beginning of year	29,900	48,000
Service cost – benefits earned during the period	700	1,100	900
Interest cost on projected benefit obligation	1,800	1,400	1,300
Actuarial (gain) loss	4,200	(13,600)
Regular benefits paid	(1,500)	(1,800)
Benefit obligation, end of year	35,100	29,900	$ 48,000
Plan amendments	0	(5,200)
Retiree drug subsidy program	$ 0	$ 0

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Note 13 - Pension Plans and Other Postretirement Benefits - Reconciliation of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Spire Missouri [Member]
Fair value of plan assets, beginning of year	$ 235.9	$ 364.0
Actual return on plan assets		(66.7)
Employer contributions		37.8
Settlement benefits paid		(87.0)
Regular benefits paid		(12.2)
Fair value of plan assets, end of year		235.9
Funded status of plans, end of year		(84.7)
Spire Alabama Inc [Member]
Fair value of plan assets, beginning of year	57.3	82.8
Actual return on plan assets		(15.6)
Employer contributions		14.4
Settlement benefits paid		(22.3)
Regular benefits paid		(2.0)
Fair value of plan assets, end of year		57.3
Funded status of plans, end of year		(40.5)
Pension Plan [Member]
Fair value of plan assets, beginning of year	332.7	498.9
Actual return on plan assets	9.1	(92.5)
Employer contributions	58.9	52.4
Settlement benefits paid	(39.1)	(109.3)
Regular benefits paid	(26.9)	(16.8)
Fair value of plan assets, end of year	334.7	332.7
Funded status of plans, end of year	(104.0)	(131.7)
Pension Plan [Member] | Spire Missouri [Member]
Fair value of plan assets, beginning of year	235.9
Actual return on plan assets	7.5
Employer contributions	30.3
Settlement benefits paid	(9.3)
Regular benefits paid	(22.4)
Fair value of plan assets, end of year	242.0	235.9
Funded status of plans, end of year	(71.2)
Pension Plan [Member] | Spire Alabama Inc [Member]
Fair value of plan assets, beginning of year	57.3
Actual return on plan assets	0.0
Employer contributions	27.9
Settlement benefits paid	(29.7)
Regular benefits paid	(1.9)
Fair value of plan assets, end of year	53.6	57.3
Funded status of plans, end of year	(27.0)
Other Postretirement Benefits Plan [Member]
Fair value of plan assets, beginning of year	264.7	326.9
Actual return on plan assets	29.9	(51.6)
Employer contributions	0.1	0.4
Regular benefits paid	(8.4)	(11.0)
Fair value of plan assets, end of year	286.3	264.7
Funded status of plans, end of year	143.7	116.6
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Fair value of plan assets, beginning of year	176.7	221.7
Actual return on plan assets	18.8	(36.2)
Employer contributions	0.1	0.4
Regular benefits paid	(6.8)	(9.2)
Fair value of plan assets, end of year	188.8	176.7
Funded status of plans, end of year	83.5	61.9
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Fair value of plan assets, beginning of year	83.3	99.4
Actual return on plan assets	10.2	(14.3)
Employer contributions	0.0	0.0
Regular benefits paid	(1.5)	(1.8)
Fair value of plan assets, end of year	92.0	83.3
Funded status of plans, end of year	$ 56.9	$ 53.4

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Note 13 - Pension Plans and Other Postretirement Benefits - Amounts Recognized in the Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Noncurrent liabilities	$ (137.3)	$ (163.0)
Spire Missouri [Member]
Noncurrent liabilities	(103.3)	(115.5)
Spire Alabama Inc [Member]
Noncurrent liabilities	(27.2)	(40.5)
Pension Plan [Member]
Current liabilities	(1.6)	(1.1)
Noncurrent liabilities	(102.4)	(130.6)
Total	(104.0)	(131.7)
Pension Plan [Member] | Spire Missouri [Member]
Current liabilities	(1.6)	(1.1)
Noncurrent liabilities	(69.6)	(83.6)
Total	(71.2)	(84.7)
Pension Plan [Member] | Spire Alabama Inc [Member]
Current liabilities	0.0	0.0
Noncurrent liabilities	(27.0)	(40.5)
Total	(27.0)	(40.5)
Other Postretirement Benefits Plan [Member]
Current liabilities	(0.4)	(0.3)
Noncurrent liabilities	(36.6)	(34.7)
Noncurrent assets	180.7	151.6
Total	143.7	116.6
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Current liabilities	(0.4)	(0.3)
Noncurrent liabilities	(36.6)	(34.7)
Noncurrent assets	120.5	96.9
Total	83.5	61.9
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Current liabilities	0.0	0.0
Noncurrent liabilities	0.0	0.0
Noncurrent assets	56.9	53.4
Total	$ 56.9	$ 53.4

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Note 13 - Pension Plans and Other Postretirement Benefits - Amounts Recognized in AOCI Not Yet Recognized As Components of Net Periodic Pension Costs (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Spire Missouri [Member]
Net actuarial loss		$ 93.6
Prior service credit		(18.1)
Subtotal		75.5
Adjustments for amounts included in regulatory assets		(72.3)
Total		3.2
Spire Alabama Inc [Member]
Net actuarial loss		41.2
Prior service credit		(16.3)
Subtotal		24.9
Adjustments for amounts included in regulatory assets		(24.9)
Total		0.0
Pension Plan [Member]
Net actuarial loss	$ 130.1	132.0
Prior service credit	(31.2)	(35.7)
Subtotal	98.9	96.3
Adjustments for amounts included in regulatory assets	(95.9)	(93.1)
Total	3.0	3.2
Pension Plan [Member] | Spire Missouri [Member]
Net actuarial loss	92.5
Prior service credit	(16.2)
Subtotal	76.3
Adjustments for amounts included in regulatory assets	(73.3)
Total	3.0
Pension Plan [Member] | Spire Alabama Inc [Member]
Net actuarial loss	40.2
Prior service credit	(13.9)
Subtotal	26.3
Adjustments for amounts included in regulatory assets	(26.3)
Total	0.0
Other Postretirement Benefits Plan [Member]
Net actuarial loss	(103.3)	(83.3)
Prior service credit	7.0	7.1
Subtotal	(96.3)	(76.2)
Adjustments for amounts included in regulatory assets	96.3	76.2
Total	0.0	0.0
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Net actuarial loss	(92.3)	(74.2)
Prior service credit	7.4	7.9
Subtotal	(84.9)	(66.3)
Adjustments for amounts included in regulatory assets	84.9	66.3
Total	0.0	0.0
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Net actuarial loss	(6.1)	(5.6)
Prior service credit	(0.4)	(0.8)
Subtotal	(6.5)	(6.4)
Adjustments for amounts included in regulatory assets	6.5	6.4
Total	$ 0.0	$ 0.0

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Note 13 - Pension Plans and Other Postretirement Benefits - Assumption Used (Details)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Weighted average rate of future compensation increase	3.00%	3.00%
Spire Missouri East [Member] | Pension Plan [Member]
Weighted average discount rate	5.70%	3.00%	2.85%
Weighted average discount rate	6.25%	5.70%
Spire Missouri East [Member] | Other Postretirement Benefits Plan [Member]
Weighted average rate of future compensation increase	3.00%	3.00%
Spire Alabama Inc [Member] | Pension Plan [Member]
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	6.50%	6.75%	6.75%
Spire Alabama Inc [Member] | Pension Plan [Member] | Maximum [Member]
Weighted average discount rate	5.65%	3.10%	2.80%
Weighted average discount rate	6.20%	5.70%
Spire Alabama Inc [Member] | Pension Plan [Member] | Minimum [Member]
Weighted average discount rate	5.65%	3.10%	2.95%
Weighted average discount rate	6.25%	5.65%
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member]
Weighted average discount rate	5.80%	2.95%	2.75%
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member] | Maximum [Member]
Expected long-term rate of return on plan assets	6.00%	6.25%	6.25%
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member] | Minimum [Member]
Expected long-term rate of return on plan assets	4.75%	5.00%	5.00%
Spire Missouri [Member]
Weighted average discount rate	6.30%	5.80%
Spire Missouri [Member] | Pension Plan [Member]
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	6.50%	6.75%	6.75%
Weighted average discount rate			3.00%
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Weighted average discount rate	5.80%	2.95%	2.75%
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	5.50%	5.75%	5.75%
Spire Alabama And Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Weighted average discount rate	6.30%	5.80%
Spire Missouri West [Member] | Pension Plan [Member]
Weighted average discount rate	5.80%	3.00%	2.75%
Weighted average discount rate	6.30%	5.80%
Spire Alabama or Spire Missouri [Member] | Pension Plan [Member]
Cash balance interest crediting rate - Spire Alabama / Spire Missouri	4.25%	4.25%

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Note 13 - Pension Plans and Other Postretirement Benefits - PBO, ABO, and Fair Value of Plan Assets for Plans in Excess of Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Projected benefit obligation	$ 438.7	$ 464.4
Accumulated benefit obligation	433.1	457.1
Fair value of plan assets	334.7	332.7
Spire Missouri [Member]
Projected benefit obligation	313.2	320.6
Accumulated benefit obligation	309.5	315.0
Fair value of plan assets	242.0	235.9
Spire Alabama Inc [Member]
Projected benefit obligation	80.6	97.8
Accumulated benefit obligation	78.8	96.2
Fair value of plan assets	$ 53.6	$ 57.3

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Note 13 - Pension Plans and Other Postretirement Benefits - Targeted and Actual Plan Assets by Category (Details)	Sep. 30, 2023	Sep. 30, 2022
Pension Plan [Member] | Spire Missouri [Member]
Return seeking assets, target	100.00%	100.00%
Return seeking assets, actual	100.00%	100.00%
Pension Plan [Member] | Spire Missouri [Member] | Return Seeking Assets [Member]
Return seeking assets, target	70.00%	70.00%
Return seeking assets, actual	77.00%	74.30%
Pension Plan [Member] | Spire Missouri [Member] | Liability Hedging Assets [Member]
Return seeking assets, target	30.00%	30.00%
Return seeking assets, actual	20.00%	22.80%
Pension Plan [Member] | Spire Missouri [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Return seeking assets, target	0.00%	0.00%
Return seeking assets, actual	3.00%	2.90%
Pension Plan [Member] | Spire Alabama Inc [Member]
Return seeking assets, target	100.00%	100.00%
Return seeking assets, actual	100.00%	100.00%
Pension Plan [Member] | Spire Alabama Inc [Member] | Return Seeking Assets [Member]
Return seeking assets, target	75.00%	70.00%
Return seeking assets, actual	76.00%	68.70%
Pension Plan [Member] | Spire Alabama Inc [Member] | Liability Hedging Assets [Member]
Return seeking assets, target	25.00%	30.00%
Return seeking assets, actual	15.00%	25.30%
Pension Plan [Member] | Spire Alabama Inc [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Return seeking assets, target	0.00%	0.00%
Return seeking assets, actual	9.00%	6.00%
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Return seeking assets, target	100.00%
Return seeking assets, actual	100.00%	100.00%
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member] | Defined Benefit Plan, Equity Securities [Member]
Return seeking assets, target	60.00%
Return seeking assets, actual	58.90%	58.70%
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member] | Debt Securities [Member]
Return seeking assets, target	40.00%
Return seeking assets, actual	38.10%	40.50%
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Return seeking assets, target	0.00%
Return seeking assets, actual	3.00%	0.80%
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Return seeking assets, target	100.00%
Return seeking assets, actual	100.00%	100.00%
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member] | Defined Benefit Plan, Equity Securities [Member]
Return seeking assets, target	60.50%
Return seeking assets, actual	59.90%	57.70%
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member] | Debt Securities [Member]
Return seeking assets, target	39.50%
Return seeking assets, actual	40.10%	42.30%

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Note 13 - Pension Plans and Other Postretirement Benefits - Expected Pension Benefit Payments for Succeeding Fiscal Years (Details) $ in Millions	Sep. 30, 2023 USD ($)
Pension Plan [Member]
2024	$ 52.4
2025	45.3
2026	41.8
2027	41.8
2028	43.3
2029-2032	202.8
Pension Plan [Member] | Spire Missouri [Member]
2024	41.0
2025	34.1
2026	30.4
2027	29.4
2028	30.5
2029-2032	139.1
Pension Plan [Member] | Spire Alabama Inc [Member]
2024	8.0
2025	7.7
2026	7.8
2027	8.7
2028	8.9
2029-2032	44.1
Other Postretirement Benefits Plan [Member]
2024	14.6
2025	14.8
2026	14.9
2027	14.8
2028	14.5
2029-2032	68.6
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
2024	11.6
2025	11.8
2026	11.8
2027	11.7
2028	11.4
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
2024	2.9
2025	2.9
2026	2.9
2027	2.9
2028	$ 2.9

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Note 13 - Pension Plans and Other Postretirement Benefits - Assumed Medical Cost Trend Rates (Details) - Other Postretirement Benefits Plan [Member]	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Rate to which the medical cost trend rate is assumed to decline (the ultimate medical cost trend rate)	5.00%	5.00%
Year the rate reaches the ultimate trend	2030	2028
Spire Alabama And Spire Missouri [Member]
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri	6.50%	6.75%

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Note 13 - Pension Plans and Other Postretirement Benefits - Fair Value Measurements of Pension Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Spire Missouri [Member]
Defined Benefit Plan Assets		$ 235.9	$ 364.0
Spire Alabama Inc [Member]
Defined Benefit Plan Assets		57.3	82.8
Pension Plan [Member]
Defined Benefit Plan Assets	$ 334.7	332.7	498.9
Pension Plan [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	242.0	235.9
Pension Plan [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	53.6	57.3
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	78.8	89.9
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	56.4	59.7
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	12.9	18.0
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	255.9	242.8
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	185.6	176.2
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	40.7	39.3
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	334.7	332.7
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	242.0	235.9
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	53.6	57.3
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	14.8	11.5
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	6.8	5.7
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.6	3.5
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	14.8	11.5
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	6.8	5.7
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.6	3.5
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	139.0	122.2
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	99.4	85.7
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	22.9	21.6
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	139.0	122.2
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	99.4	85.7
Pension Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	22.9	21.6
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	55.2	61.0
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	40.2	47.2
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	8.7	8.1
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	55.2	61.0
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	40.2	47.2
Pension Plan [Member] | Real Asset Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	8.7	8.1
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	27.8	42.3
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	20.9	29.4
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.0	7.7
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	27.8	42.3
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	20.9	29.4
Pension Plan [Member] | U S Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.0	7.7
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	36.2	36.1
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	28.7	24.6
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.3	6.8
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	36.2	36.1
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	28.7	24.6
Pension Plan [Member] | U S Government Index Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	4.3	6.8
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	61.7	59.6
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	46.0	43.3
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	9.1	9.6
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	61.7	59.6
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	46.0	43.3
Pension Plan [Member] | Global Funds Including U S [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	9.1	9.6
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Assets	286.3	264.7	326.9
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	188.8	176.7	221.7
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	92.0	83.3	$ 99.4
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	193.3	181.4
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	188.8	176.7
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	93.0	83.3
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	92.0	83.3
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	286.3	264.7
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	188.8	176.7
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	92.0	83.3
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	5.1	3.5
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	4.3	2.7
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	5.1	3.5
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	4.3	2.7
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	188.2	177.1
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	184.5	174.0
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	76.5	69.4
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	76.5	69.4
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	264.7	246.5
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Missouri [Member]
Defined Benefit Plan Assets	184.5	174.0
Other Postretirement Benefits Plan [Member] | U S Stock Bond Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	76.5	69.4
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Assets	0.0	0.8
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	0.0	0.0
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Assets	16.5	13.9
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	15.5	13.9
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Assets	16.5	14.7
Other Postretirement Benefits Plan [Member] | Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 3 [Member] | Spire Alabama Inc [Member]
Defined Benefit Plan Assets	$ 15.5	$ 13.9

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Note 14 - Information by Operating Segment (Details Textual)	12 Months Ended
	Sep. 30, 2023
Number of Reportable Segments	3

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Note 14 - Information by Operating Segment - Segment Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues from external customers	$ 2,666.3	$ 2,198.5	$ 2,235.5
Intersegment revenues	0.0	0.0	0.0
Operating Revenues	2,666.3	2,198.5	2,235.5
Depreciation and amortization	254.8	237.3	213.1
Interest Expense	185.7	119.8	106.6
Income Tax Expense	38.8	58.9	68.5
Net economic earnings (loss)	228.1	216.3	266.3
Capital expenditures	662.5	552.2	624.8
Consolidation, Eliminations [Member]
Revenues from external customers	0.0	0.0	0.0
Intersegment revenues	(52.5)	(51.7)	(48.0)
Operating Revenues	(52.5)	(51.7)	(48.0)
Depreciation and amortization	0.0	0.0	0.0
Interest Expense	(34.9)	(8.8)	(1.4)
Income Tax Expense	0.0	0.0	0.0
Net economic earnings (loss)	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0
Gas Utility [Member] | Operating Segments [Member]
Revenues from external customers	2,456.6	1,945.6	2,118.2
Intersegment revenues	0.3	0.5	1.1
Operating Revenues	2,456.9	1,946.1	2,119.3
Depreciation and amortization	244.4	227.9	204.4
Interest Expense	139.9	86.4	74.7
Income Tax Expense	32.7	49.6	56.9
Net economic earnings (loss)	200.5	202.7	230.6
Capital expenditures	588.6	528.6	590.4
Gas Marketing [Member] | Operating Segments [Member]
Revenues from external customers	179.1	234.9	96.5
Intersegment revenues	0.0	0.0	0.0
Operating Revenues	179.1	234.9	96.5
Depreciation and amortization	1.5	1.4	1.2
Interest Expense	0.0	0.0	0.0
Income Tax Expense	12.8	11.9	13.4
Net economic earnings (loss)	47.6	27.0	47.0
Capital expenditures	0.4	0.9	0.7
Midstream [Member] | Operating Segments [Member]
Revenues from external customers	29.9	17.4	19.9
Intersegment revenues	36.2	35.7	32.7
Operating Revenues	66.1	53.1	52.6
Depreciation and amortization	8.4	7.5	6.9
Interest Expense	8.6	4.9	4.0
Income Tax Expense	3.8	4.5	4.4
Net economic earnings (loss)	14.1	11.1	11.1
Capital expenditures	73.6	22.6	33.0
Other Segments [Member]
Depreciation and amortization	0.5	0.5	0.6
Interest Expense	72.1	37.3	29.3
Income Tax Expense	(10.5)	(7.1)	(6.2)
Other Segments [Member] | Consolidation, Eliminations [Member]
Revenues from external customers	0.7	0.6	0.9
Intersegment revenues	16.0	15.5	14.2
Operating Revenues	16.7	16.1	15.1
Net economic earnings (loss)	(34.1)	(24.5)	(22.4)
Capital expenditures	$ (0.1)	$ 0.1	$ 0.7

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Note 14 - Information by Operating Segment - Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Total Assets	$ 10,313.6	$ 10,083.7	$ 9,356.4
Operating Segments [Member] | Gas Utility [Member]
Total Assets	8,486.7	8,042.8	7,615.4
Operating Segments [Member] | Gas Marketing [Member]
Total Assets	332.0	638.7	466.1
Operating Segments [Member] | Midstream [Member]
Total Assets	574.3	446.0	413.8
Operating Segments [Member] | Other Segments [Member]
Total Assets	2,533.3	2,705.5	2,193.3
Consolidation, Eliminations [Member]
Total Assets	$ (1,612.7)	$ (1,749.3)	$ (1,332.2)

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Note 14 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 217.5	$ 220.8	$ 271.7
Missouri regulatory adjustments	0.0	0.0	(9.0)
Fair value and timing adjustments	11.4	(11.4)	3.3
Acquisition and divestiture activities	2.5	0.0	(1.3)
Income tax adjustments	(3.3)	6.9	1.6
Net Economic Earnings	$ 228.1	$ 216.3	$ 266.3

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Note 15 - Regulatory Matters (Details Textual) - USD ($) $ in Thousands															1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 01, 2023	Oct. 04, 2023	Sep. 01, 2023	Apr. 30, 2023	Apr. 20, 2023	Jan. 01, 2023	Nov. 18, 2022	Apr. 22, 2022	Feb. 01, 2022	Jan. 01, 2022	Dec. 29, 2021	Dec. 23, 2021	Oct. 26, 2021	Oct. 01, 2018	Sep. 30, 2022	Feb. 28, 2021	Nov. 30, 2019	Mar. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jan. 25, 2023
Customer Share																				75.00%
Utilities Operating Expense, Gas and Petroleum Purchased																				$ 1,260,800	$ 923,900	$ 946,300
Missouri Public Service Commission [Member] | Infrastructure System Replacement Surcharge [Member]
Public Utilities, Requested Rate Increase (Decrease), Amount												$ 47,300
Alabama Public Service Commission [Member] | Enhanced Stability Reserve [Member]
Utilities Operating Expense Maintenance and Operations Self Insurance Cost Deferred Amount																					1,000
Utilities Operating Expense Maintenance and Operations Self Insurance Cost Single Force Majeure Event Deferred Amount																				300
Utilities Operating Expense Maintenance and Operations Self Insurance Cost Multiple Force Majeure Events Deferred Amount																				400
Regulated Operating Revenue Variances Amount																				$ 400
Regulated Operations Enhanced Stability Reserve Underfunded Balances Amortization Term (Year)																				5 years
Regulated Operations, Enhanced Stability Reserve, Unfunded Balances, Amortization, Annual Limitation																				$ 700
Spire Missouri [Member]
Customer Share																				25.00%
Utilities Operating Expense, Gas and Petroleum Purchased																$ 195,800				$ 943,400	587,000	786,800
Public Utilities, Reduced Revenue Accounts Receivable Cost Of Gas and Regulatory Liabilities																		$ 150,000
Utilities Operating, Due From Other Parties																		$ 42,000
Spire Missouri [Member] | Missouri Public Service Commission [Member]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 78,000					72,200
Public Utilities, Requested Rate Increase (Decrease), Amount												$ 24,900
Public Utilities, Deferred Amount Under Order Authorizing Accounting Treatment															$ 42,800						42,800
Public Utilities, Approved Rate, Increase Decrease Annualized Revenue					$ 7,700
Public Utilities, Disallowance From ACA Balance																							$ 600
Spire Missouri [Member] | Missouri Public Service Commission [Member] | Subsequent Event [Member]
Public Utilities, Approved Rate, Increase Decrease Annualized Revenue		$ 12,400
Spire Missouri [Member] | Missouri Public Service Commission [Member] | Infrastructure System Replacement Surcharge [Member]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 19,000
Spire Alabama Inc [Member]
Utilities Operating Expense, Gas and Petroleum Purchased																				202,700	$ 161,500	145,300
Public Utilities, Rate Increase Decrease Index Range Margin															1.50%						1.50%
Public Utilities, Approved Point of Test Giveback Under Rate Stabilization and Equalization															$ 2,200						$ 2,200	2,200
Financing Receivable, after Allowance for Credit Loss															$ 7,100					6,700	7,100
Spire Alabama Inc [Member] | Maximum [Member] | Spire [Member] | Related Party [Member]
Financing Receivable, after Allowance for Credit Loss																				25,000
Spire Alabama Inc [Member] | Alabama Public Service Commission [Member]
Public Utilities, Approved Rate Increase (Decrease), Amount										$ 5,300										4,400		8,800
Public Utilities, Requested Rate Increase (Decrease), Amount											$ 5,300										$ 17,200
Public Utilities Maximum Return on Equity Percentage of Prior Year Revenues															4.00%						4.00%
Public Utilities, Approved Return on Equity, Percentage														10.40%	9.70%
Public Utilities, Rate Increase Decrease Index Range Margin															0.10%						0.10%
Public Utilities, Equity Limitation as Percent of Total Capitalization															55.50%						55.50%
Public Utilities, Equity Limitation as Percent of Average Common Equity Growth															6.00%						6.00%
Annual Revenue Increase From Rates, Amount						$ 15,000
Public Utilities Approved Percentage of Excess Natural Gas Supply and Capacity to Customers																	75.00%
Public Utilities Approved Percentage of Excess Natural Gas Supply and Capacity To Retain								25.00%									25.00%
Public Utilities, Value From Capacity Release, Threshold								$ 1,600
Spire Alabama Inc [Member] | Alabama Public Service Commission [Member] | Forecast [Member]
Annual Revenue Increase From Rates, Amount	$ 15,800
Spire Alabama Inc [Member] | Alabama Public Service Commission [Member] | Minimum [Member]
Public Utilities, Approved Return on Equity, Percentage														10.15%	9.50%
Spire Alabama Inc [Member] | Alabama Public Service Commission [Member] | Maximum [Member]
Public Utilities, Approved Return on Equity, Percentage														10.65%	9.90%
Spire Gulf [Member]
Public Utilities, Approved Rate Increase (Decrease), Amount																					$ 1,700	2,300
Public Utilities, Approved Rate, Increase Decrease Annualized Revenue				$ 1,800		2,500				$ 1,000
Public Utilities, Approved Return on Equity, Percentage													9.95%								10.70%
Public Utilities, Rate Increase Decrease Index Range Margin															1.50%						1.50%
Utilities Operating Expense Maintenance and Operations Self Insurance Cost Single Force Majeure Event Deferred Amount																				100
Utilities Operating Expense Maintenance and Operations Self Insurance Cost Multiple Force Majeure Events Deferred Amount																				150
Regulated Operating Revenue Variances Amount																				$ 100
Public Utilities, Approved Rate, Net Income Benefit																						$ 1,600
Public Utilities, Approved Return on Equity, Pro-Rata, Percentage																				75.00%
Regulated Operations, Recovery of Incurred Costs, Percentage																				90.00%
Spire Gulf [Member] | Forecast [Member]
Public Utilities, Approved Rate, Increase Decrease Annualized Revenue	$ 2,000
Public Utilities, Approved Return on Equity, Percentage																			9.95%
Spire Gulf [Member] | Minimum [Member]
Public Utilities, Approved Return on Equity, Percentage																					10.45%
Spire Gulf [Member] | Minimum [Member] | Forecast [Member]
Public Utilities, Approved Return on Equity, Percentage																			9.70%
Spire Gulf [Member] | Maximum [Member]
Public Utilities, Approved Return on Equity, Percentage																					10.95%
Spire Gulf [Member] | Maximum [Member] | Forecast [Member]
Public Utilities, Approved Return on Equity, Percentage																			10.30%
Spire [Member] | Alabama Public Service Commission [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				$ 75,000
Spire Mississippi [Member]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 1,300
Public Utilities, Approved Rate, Increase Decrease Annualized Revenue						$ 800			$ 800
Public Utilities, Approved Return on Equity, Percentage																				10.04%
Public Utilities, Approved Return on Equity, Excess of Allowed Return, Percentage																				1.00%
Public Utilities, Approved Return on Equity Shortfall Percentage																				75.00%
Public Utilities, Approved Return On Equity, Excess, Percentage																				50.00%
Future Income Taxes Due From Customers and Pension and Other Postretirement Benefit Costs [Member]
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)																				20 years
PGA Assets [Member]
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)																				2 years
PGA Assets Not Earning A Return [Member]
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)																				15 years

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Note 15 - Regulatory Matters - Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Regulatory assets	$ 348.3	$ 355.4
Regulatory Assets Noncurrent	1,249.2	1,112.4
Total Regulatory Assets	1,597.5	1,467.8
Regulatory Liability Current	7.3	3.7
Regulatory Liability Noncurrent	472.4	418.2
Total Regulatory Liabilities	479.7	421.9
Spire Missouri [Member]
Regulatory assets	293.1	288.1
Regulatory Assets Noncurrent	617.6	547.6
Total Regulatory Assets	910.7	835.7
Regulatory Liability Current	0.0	0.0
Regulatory Liability Noncurrent	389.4	331.8
Total Regulatory Liabilities	389.4	331.8
Spire Alabama Inc [Member]
Regulatory assets	41.6	56.9
Regulatory Assets Noncurrent	606.9	538.2
Total Regulatory Assets	648.5	595.1
Regulatory Liability Current	0.0	0.0
Regulatory Liability Noncurrent	21.2	23.0
Total Regulatory Liabilities	21.2	23.0
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets	293.2	322.2
Regulatory Assets Noncurrent	23.0	0.0
Regulatory Liability Current	11.2	53.0
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets	269.4	275.1
Regulatory Assets Noncurrent	23.0	0.0
Regulatory Liability Current	11.2	53.0
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Alabama Inc [Member]
Regulatory assets	21.7	43.8
Regulatory Assets Noncurrent	0.0	0.0
Regulatory Liability Current	0.0	0.0
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets	55.1	33.2
Regulatory Assets Noncurrent	131.2	129.2
Regulatory Liability Current	7.3	3.7
Regulatory Liability Noncurrent	21.4	14.4
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets	23.7	13.0
Regulatory Assets Noncurrent	116.0	113.1
Regulatory Liability Current	0.0	0.0
Regulatory Liability Noncurrent	16.5	7.3
Other Regulatory Assets (Liabilities) [Member] | Spire Alabama Inc [Member]
Regulatory assets	19.9	13.1
Regulatory Assets Noncurrent	0.9	1.0
Regulatory Liability Current	0.0	0.0
Regulatory Liability Noncurrent	3.3	3.6
Deferred Income Tax Charge [Member]
Regulatory Assets Noncurrent	144.5	137.8
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	136.2	129.2
Deferred Income Tax Charge [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	2.0	2.2
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets	261.0	294.5
Regulatory Assets Noncurrent	185.2	172.6
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets	189.1	222.9
Regulatory Assets Noncurrent	156.5	143.6
Pension and Other Postretirement Plans Costs [Member] | Spire Alabama Inc [Member]
Regulatory assets	67.8	66.5
Regulatory Assets Noncurrent	17.9	19.4
Removal Costs [Member]
Regulatory Assets Noncurrent	633.2	493.7
Regulatory Liability Noncurrent	126.6	32.9
Removal Costs [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	97.0	25.2
Regulatory Liability Noncurrent	90.4	0.0
Removal Costs [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	536.2	468.5
Regulatory Liability Noncurrent	0.0	0.0
Renewable Energy Program [Member]
Regulatory Assets Noncurrent	56.3	57.2
Renewable Energy Program [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	56.3	57.2
Renewable Energy Program [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	0.0	0.0
Estimated Deferred Taxes Due to Customers [Member]
Regulatory Liability Noncurrent	128.0	145.3
Estimated Deferred Taxes Due to Customers [Member] | Spire Missouri [Member]
Regulatory Liability Noncurrent	114.8	127.9
Estimated Deferred Taxes Due to Customers [Member] | Spire Alabama Inc [Member]
Regulatory Liability Noncurrent	$ 0.0	$ 0.0

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Note 15 - Regulatory Matters - Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Regulatory assets not earning a return	$ 672.5	$ 686.3
Spire Missouri [Member]
Regulatory assets not earning a return	666.2	679.9
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets not earning a return	133.4	152.9
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	133.4	152.9
Deferred Income Tax Charge [Member]
Regulatory assets not earning a return	142.5	135.6
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	136.2	129.2
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets not earning a return	292.4	275.1
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	292.4	275.1
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets not earning a return	104.2	122.7
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	$ 104.2	$ 122.7

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Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2023	Sep. 30, 2023
Long-Term Purchase Commitment, Amount		$ 1,613.2
Capital Committed to Contribute to Partnership		10.0
Remaining Unfunded Capital Commitment		4.9
MoGas Pipeline and Omega Pipeline [Member]
Business Combination, Price of Acquisition, Expected	$ 175.0
Spire Missouri [Member]
Long-Term Purchase Commitment, Amount		1,182.0
Spire Alabama Inc [Member]
Long-Term Purchase Commitment, Amount		$ 251.6

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Note 17 - Leases - Operating Lease Cost, Cash Flow and Noncash Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Operating lease cost, including amounts capitalized	$ 7.3	$ 7.4	$ 7.2
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities	7.3	7.3	7.2
Right-of-use assets obtained in exchange for lease liabilities	0.8	24.6	0.0
Spire Missouri [Member]
Operating lease cost, including amounts capitalized	0.5	0.5	0.4
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities	0.5	0.5	0.4
Right-of-use assets obtained in exchange for lease liabilities	0.8	1.1	0.0
Spire Alabama Inc [Member]
Operating lease cost, including amounts capitalized	2.0	2.1	2.1
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities	2.1	2.1	2.1
Right-of-use assets obtained in exchange for lease liabilities	$ 0.0	$ 23.5	$ 0.0

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Note 17 - Leases - Year-end Balance Sheet and Weighted-average Information About Operating Lease (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Weighted-average remaining lease term (in years) (Year)	14 years 1 month 6 days	15 years
Weighted-average discount rate	4.20%	4.10%
Spire Missouri [Member]
Weighted-average remaining lease term (in years) (Year)	5 years 7 months 6 days	5 years 1 month 6 days
Weighted-average discount rate	3.30%	2.20%
Spire Alabama Inc [Member]
Weighted-average remaining lease term (in years) (Year)	13 years 3 months 18 days	14 years 3 months 18 days
Weighted-average discount rate	3.70%	3.70%
Deferred Charges and Other Assets, Other [Member]
Right-of-use assets	$ 70.6	$ 73.7
Deferred Charges and Other Assets, Other [Member] | Spire Missouri [Member]
Right-of-use assets	2.1	1.7
Deferred Charges and Other Assets, Other [Member] | Spire Alabama Inc [Member]
Right-of-use assets	19.2	20.2
Other Current Liabilities [Member]
Lease liabilities, current	6.8	6.5
Other Current Liabilities [Member] | Spire Missouri [Member]
Lease liabilities, current	0.5	0.4
Other Current Liabilities [Member] | Spire Alabama Inc [Member]
Lease liabilities, current	1.9	1.9
Deferred Credits and Other Liabilities, Other [Member]
Lease liabilities, noncurrent	70.2	73.7
Deferred Credits and Other Liabilities, Other [Member] | Spire Missouri [Member]
Lease liabilities, noncurrent	1.8	1.5
Deferred Credits and Other Liabilities, Other [Member] | Spire Alabama Inc [Member]
Lease liabilities, noncurrent	$ 23.5	$ 24.6

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Note 17 - Leases - Maturity of Operating Lease Liabilities (Details) $ in Millions	Sep. 30, 2023 USD ($)
2024	$ 6.9
2025	7.5
2026	7.5
2027	7.4
2028	7.4
Thereafter	65.9
Total undiscounted lease payments	102.6
Less present value discount	(25.6)
Total current and noncurrent lease liabilities	77.0
Spire Missouri [Member]
2024	0.5
2025	0.6
2026	0.4
2027	0.3
2028	0.3
Thereafter	0.5
Total undiscounted lease payments	2.6
Less present value discount	(0.3)
Total current and noncurrent lease liabilities	2.3
Spire Alabama Inc [Member]
2024	1.9
2025	2.2
2026	2.2
2027	2.3
2028	2.3
Thereafter	21.7
Total undiscounted lease payments	32.6
Less present value discount	(7.2)
Total current and noncurrent lease liabilities	$ 25.4