10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	FOR THE QUARTERLY PERIOD ENDED March 31, 2021 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 1-3701

AVISTA CORPORATION

(Exact name of Registrant as specified in its charter)

Washington	91-0462470
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1411 East Mission Avenue, Spokane, Washington 99202-2600

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: 509-489-0500

None

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol(s)	Name of Each Exchange on Which Registered
Common Stock	AVA	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 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:    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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	☐

If an emerging growth company, indicate by check mark if the 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   ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):    Yes  ☐    No  ☒

As of April 30, 2021, 69,314,368 shares of Registrant’s Common Stock, no par value (the only class of common stock), were outstanding.

AVISTA CORPORATION

AVISTA CORPORATION

INDEX

Item No.		Page No.
	Acronyms and Terms	iii
	Forward-Looking Statements	1
	Available Information	4
Part I. Financial Information
Item 1.	Condensed Consolidated Financial Statements	5
	Condensed Consolidated Statements of Income - Three Months Ended March 31, 2021 and 2020	5
	Condensed Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2021 and 2020	6
	Condensed Consolidated Balance Sheets - March 31, 2021 and December 31, 2020	7
	Condensed Consolidated Statements of Cash Flows - Three Months Ended March 31, 2021 and 2020	8
	Condensed Consolidated Statements of Equity - Three Months Ended March 31, 2021 and 2020	10
	Notes to Condensed Consolidated Financial Statements	11
	Note 1. Summary of Significant Accounting Policies	11
	Note 2. New Accounting Standards	12
	Note 3. Balance Sheet Components	12
	Note 4. Revenue	15
	Note 5. Derivatives and Risk Management	18
	Note 6. Pension Plans and Other Postretirement Benefit Plans	22
	Note 7. Income Taxes	23
	Note 8. Committed Lines of Credit	23
	Note 9. Credit Agreement	24
	Note 10. Long-Term Debt to Affiliated Trusts	24
	Note 11. Fair Value	24
	Note 12. Common Stock	28
	Note 13. Accumulated Other Comprehensive Loss	28
	Note 14. Earnings per Common Share	29
	Note 15. Commitments and Contingencies	29
	Note 16. Information by Business Segments	31
	Report of Independent Registered Public Accounting Firm	33
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
	Business Segments	34
	Executive Level Summary	34
	Regulatory Matters	35
	Results of Operations - Overall	38
	Non-GAAP Financial Measures	39
	Results of Operations - Avista Utilities	40

i

	Results of Operations - Alaska Electric Light and Power Company	47
	Results of Operations - Other Businesses	47
	Critical Accounting Policies and Estimates	47
	Liquidity and Capital Resources	48
	Overall Liquidity	48
	Review of Cash Flow Statement	48
	Capital Resources	48
	Capital Expenditures	50
	Off-Balance Sheet Arrangements	50
	Pension Plan	50
	Contractual Obligations	50
	Environmental Issues and Other Contingencies	50
	Colstrip	51
	Enterprise Risk Management	51
	Future Resource Needs	53
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	54
Item 4.	Controls and Procedures	54
Part II. Other Information
Item 1.	Legal Proceedings	54
Item 1A.	Risk Factors	54
Item 6.	Exhibits	55
	Signature	56

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AVISTA CORPORATION

ACRONYMS AND TERMS

(The following acronyms and terms are found in multiple locations within the document)

Acronym/Term	Meaning
aMW	-	Average Megawatt - a measure of the average rate at which a particular generating source produces energy over a period of time
AEL&P	-	Alaska Electric Light and Power Company, the primary operating subsidiary of AERC, which provides electric services in Juneau, Alaska
AERC	-	Alaska Energy and Resources Company, the Company's wholly-owned subsidiary based in Juneau, Alaska
AFUDC	-	Allowance for Funds Used During Construction; represents the cost of both the debt and equity funds used to finance utility plant additions during the construction period
ASC	-	Accounting Standards Codification
ASU	-	Accounting Standards Update
Avista Capital	-	Parent company to the Company’s non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC.
Avista Corp.	-	Avista Corporation, the Company
Avista Utilities	-	Operating division of Avista Corp. (not a subsidiary) comprising the regulated utility operations in the Pacific Northwest
Capacity	-	The rate at which a particular generating source is capable of producing energy, measured in KW or MW
Cabinet Gorge	-	The Cabinet Gorge Hydroelectric Generating Project, located on the Clark Fork River in Idaho
CETA	-	Clean Energy Transformation Act
Colstrip	-	The coal-fired Colstrip Generating Plant in southeastern Montana
Cooling degree days	-	The measure of the warmness of weather experienced, based on the extent to which the average of high and low temperatures for a day exceeds 65 degrees Fahrenheit (annual degree days above historic indicate warmer than average temperatures)
COVID-19	-	Coronavirus disease 2019, a respiratory illness that was declared a pandemic in March 2020
Deadband or ERM deadband	-	The first $4.0 million in annual power supply costs above or below the amount included in base retail rates in Washington under the ERM in the state of Washington
EIM	-	Energy Imbalance Market
Energy	-	The amount of electricity produced or consumed over a period of time, measured in KWh or MWh. Also, refers to natural gas consumed and is measured in dekatherms
EPA	-	Environmental Protection Agency
ERM	-	The Energy Recovery Mechanism, a mechanism for accounting and rate recovery of certain power supply costs accepted by the utility commission in the state of Washington
FASB	-	Financial Accounting Standards Board
FCA	-	Fixed Cost Adjustment, the electric and natural gas decoupling mechanism in Idaho
FERC	-	Federal Energy Regulatory Commission
GAAP	-	Generally Accepted Accounting Principles
Heating degree days	-	The measure of the coldness of weather experienced, based on the extent to which the average of high and low temperatures for a day falls below 65 degrees Fahrenheit (annual degree days below historic indicate warmer than average temperatures).
IPUC	-	Idaho Public Utilities Commission
Juneau	-	The City and Borough of Juneau, Alaska
KW, KWh	-	Kilowatt (1000 watts): a measure of generating power or capability.  Kilowatt-hour (1000 watt hours): a measure of energy produced over a period of time

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AVISTA CORPORATION

MPSC	-	Public Service Commission of the State of Montana
MW, MWh	-	Megawatt: 1000 KW.  Megawatt-hour: 1000 KWh
Noxon Rapids	-	The Noxon Rapids Hydroelectric Generating Project, located on the Clark Fork River in Montana
OPUC	-	The Public Utility Commission of Oregon
PCA	-	The Power Cost Adjustment mechanism, a procedure for accounting and rate recovery of certain power supply costs accepted by the utility commission in the state of Idaho
PGA	-	Purchased Gas Adjustment
PPA	-	Power Purchase Agreement
RCA	-	The Regulatory Commission of Alaska
REC	-	Renewable energy credit
ROE	-	Return on equity
ROR	-	Rate of return on rate base
ROU	-	Right-of-use lease asset
SEC	-	U.S. Securities and Exchange Commission
TCJA	-	The "Tax Cuts and Jobs Act," signed into law on December 22, 2017
Therm	-	Unit of measurement for natural gas; a therm is equal to approximately one hundred cubic feet (volume) or 100,000 BTUs (energy)
Watt	-	Unit of measurement of electric power or capability; a watt is equal to the rate of work represented by a current of one ampere under a pressure of one volt
WUTC	-	Washington Utilities and Transportation Commission

iv

AVISTA CORPORATION

Forward-Looking Statements

From time to time, we make forward-looking statements such as statements regarding projected or future:

• financial performance;

• cash flows;

• capital expenditures;

• dividends;

• capital structure;

• other financial items;

• strategic goals and objectives;

• business environment; and

• plans for operations.

These statements are based upon underlying assumptions (many of which are based, in turn, upon further assumptions). Such statements are made both in our reports filed under the Securities Exchange Act of 1934, as amended (including this Quarterly Report on Form 10-Q), and elsewhere. Forward-looking statements are all statements except those of historical fact including, without limitation, those that are identified by the use of words that include “will,” “may,” “could,” “should,” “intends,” “plans,” “seeks,” “anticipates,” “estimates,” “expects,” “forecasts,” “projects,” “predicts,” and similar expressions.

Forward-looking statements (including those made in this Quarterly Report on Form 10-Q) are subject to a variety of risks, uncertainties and other factors. Most of these factors are beyond our control and may have a significant effect on our operations, results of operations, financial condition or cash flows, which could cause actual results to differ materially from those anticipated in our statements. Such risks, uncertainties and other factors include, among others:

Utility Regulatory Risk

• state and federal regulatory decisions or related judicial decisions that affect our ability to recover costs and earn a reasonable return including, but not limited to, disallowance or delay in the recovery of capital investments, operating costs, commodity costs, interest rate swap derivatives, the ordering of refunds to customers and discretion over allowed return on investment;

• the loss of regulatory accounting treatment, which could require the write-off of regulatory assets and the loss of regulatory deferral and recovery mechanisms;

Operational Risk

• pandemics (including the current COVID-19 pandemic), which could disrupt our business, as well as the global, national and local economy, resulting in a decline in customer demand, deterioration in the creditworthiness of our customers, increases in operating and capital costs, workforce shortages, delays in capital projects, disruption in supply chains, and disruption, weakness and volatility in capital markets. In addition, any of these factors could negatively impact our liquidity and limit our access to capital, among other implications;

• wildfires ignited, or allegedly ignited, by Avista Corp. equipment or facilities could cause significant loss of life and property or result in liability for resulting fire suppression costs, thereby causing serious operational and financial harm to Avista Corp. and our customers;

• severe weather or natural disasters, including, but not limited to, avalanches, wind storms, wildfires, earthquakes, snow and ice storms, that could disrupt energy generation, transmission and distribution, as well as the availability and costs of fuel, materials, equipment, supplies and support services;

• explosions, fires, accidents, mechanical breakdowns or other incidents that could impair assets and may disrupt operations of any of our generation facilities, transmission, and electric and natural gas distribution systems or other operations and may require us to purchase replacement power or incur costs to repair our facilities;

• explosions, fires, accidents or other incidents arising from or allegedly arising from our operations that could cause injuries to the public or property damage;

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AVISTA CORPORATION

• blackouts or disruptions of interconnected transmission systems (the regional power grid);

• terrorist attacks, cyberattacks or other malicious acts that could disrupt or cause damage to our utility assets or to the national or regional economy in general, including any effects of terrorism, cyberattacks, ransomware, or vandalism that damage or disrupt information technology systems;

• work-force issues, including changes in collective bargaining unit agreements, strikes, work stoppages, the loss of key executives, availability of workers in a variety of skill areas, and our ability to recruit and retain employees;

• increasing costs of insurance, more restrictive coverage terms and our ability to obtain insurance;

• delays or changes in construction costs, and/or our ability to obtain required permits and materials for present or prospective facilities;

• increasing health care costs and cost of health insurance provided to our employees and retirees;

• third party construction of buildings, billboard signs, towers or other structures within our rights of way, or placement of fuel containers within close proximity to our transformers or other equipment, including overbuild atop natural gas distribution lines;

• the loss of key suppliers for materials or services or other disruptions to the supply chain;

• adverse impacts to our Alaska electric utility (AEL&P) that could result from an extended outage of its hydroelectric generating resources or their inability to deliver energy, due to their lack of interconnectivity to any other electrical grids and the availability or cost of replacement power (diesel);

• changing river regulation or operations at hydroelectric facilities not owned by us, which could impact our hydroelectric facilities downstream;

• change in the use, availability or abundancy of water resources and/or rights needed for operation of our hydroelectric facilities;

Cyber and Technology Risk

• cyberattacks on the operating systems that are used in the operation of our electric generation, transmission and distribution facilities and our natural gas distribution facilities, and cyberattacks on such systems of other energy companies with which we are interconnected, which could damage or destroy facilities or systems or disrupt operations for extended periods of time and result in the incurrence of liabilities and costs;

• cyberattacks on the administrative systems that are used in the administration of our business, including customer billing and customer service, accounting, communications, compliance and other administrative functions, and cyberattacks on such systems of our vendors and other companies with which we do business, which could result in the disruption of business operations, the release of private information and the incurrence of liabilities and costs;

• changes in costs that impede our ability to effectively implement new information technology systems or to operate and maintain current production technology;

• changes in technologies, possibly making some of the current technology we utilize obsolete or introducing new cyber security risks;

• insufficient technology skills, which could lead to the inability to develop, modify or maintain our information systems;

Strategic Risk

• growth or decline of our customer base due to new uses for our services or decline in existing services, including, but not limited to, the effect of the trend toward distributed generation at customer sites;

• the potential effects of negative publicity regarding our business practices, whether true or not, which could hurt our reputation and result in litigation or a decline in our common stock price;

• changes in our strategic business plans, which could be affected by any or all of the foregoing, including the entry into new businesses and/or the exit from existing businesses and the extent of our business development efforts where potential future business is uncertain;

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AVISTA CORPORATION

• wholesale and retail competition including alternative energy sources, growth in customer-owned power resource technologies that displace utility-supplied energy or that may be sold back to the utility, and alternative energy suppliers and delivery arrangements;

• entering into or growth of non-regulated activities may increase earnings volatility;

• the risk of municipalization or other forms of service territory reduction;

External Mandates Risk

• changes in environmental laws, regulations, decisions and policies, including present and potential environmental remediation costs and our compliance with these matters;

• the potential effects of initiatives, legislation or administrative rulemaking at the federal, state or local levels, including possible effects on our generating resources, prohibitions or restrictions on new or existing services, or restrictions on greenhouse gas emissions to mitigate concerns over global climate changes;

• political pressures or regulatory practices that could constrain or place additional cost burdens on our distribution systems through accelerated adoption of distributed generation or electric-powered transportation or on our energy supply sources, such as campaigns to halt fossil fuel fired power generation and opposition to other thermal generation, wind turbines or hydroelectric facilities;

• failure to identify changes in legislation, taxation and regulatory issues that could be detrimental or beneficial to our overall business;

• policy and/or legislative changes in various regulated areas, including, but not limited to, environmental regulation, healthcare regulations and import/export regulations;

Financial Risk

• weather conditions, which affect both energy demand and electric generating capability, including the impact of precipitation and temperature on hydroelectric resources, the impact of wind patterns on wind-generated power, weather-sensitive customer demand, and similar impacts on supply and demand in the wholesale energy markets;

• our ability to obtain financing through the issuance of debt and/or equity securities, which could be affected by various factors including our credit ratings, interest rates, other capital market conditions and global economic conditions;

• changes in interest rates that affect borrowing costs, our ability to effectively hedge interest rates for anticipated debt issuances, variable interest rate borrowing and the extent to which we recover interest costs through retail rates collected from customers;

• changes in actuarial assumptions, interest rates and the actual return on plan assets for our pension and other postretirement benefit plans, which could affect future funding obligations, pension and other postretirement benefit expense and the related liabilities;

• the outcome of legal proceedings and other contingencies;

• economic conditions in our service areas, including the economy's effects on customer demand for utility services;

• economic conditions nationally may affect the valuation of our unregulated portfolio companies;

• declining energy demand related to customer energy efficiency, conservation measures and/or increased distributed generation;

• changes in the long-term climate and weather could materially affect, among other things, customer demand, the volume and timing of streamflows required for hydroelectric generation, costs of generation, transmission and distribution. Increased or new risks may arise from severe weather or natural disasters, including wildfires;

• industry and geographic concentrations which could increase our exposure to credit risks due to counterparties, suppliers and customers being similarly affected by changing conditions;

• deterioration in the creditworthiness of our customers;

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AVISTA CORPORATION

Energy Commodity Risk

• volatility and illiquidity in wholesale energy markets, including exchanges, the availability of willing buyers and sellers, changes in wholesale energy prices that could affect operating income, cash requirements to purchase electricity and natural gas, value received for wholesale sales, collateral required of us by individual counterparties and/or exchanges in wholesale energy transactions and credit risk to us from such transactions, and the market value of derivative assets and liabilities;

• default or nonperformance on the part of any parties from whom we purchase and/or sell capacity or energy;

• potential environmental regulations or lawsuits affecting our ability to utilize or resulting in the obsolescence of our power supply resources;

• explosions, fires, accidents, pipeline ruptures or other incidents that could limit energy supply to our facilities or our surrounding territory, which could result in a shortage of commodities in the market that could increase the cost of replacement commodities from other sources;

Compliance Risk

• changes in laws, regulations, decisions and policies at the federal, state or local levels, which could materially impact both our electric and gas operations and costs of operations; and

• the ability to comply with the terms of the licenses and permits for our hydroelectric or thermal generating facilities at cost-effective levels.

Our expectations, beliefs and projections are expressed in good faith. We believe they are reasonable based on, without limitation, an examination of historical operating trends, our records and other information available from third parties. There can be no assurance that our expectations, beliefs or projections will be achieved or accomplished. Furthermore, any forward-looking statement speaks only as of the date on which such statement is made. We undertake no obligation to update any forward-looking statement or statements to reflect events or circumstances that occur after the date on which such statement is made or to reflect the occurrence of unanticipated events. New risks, uncertainties and other factors emerge from time to time, and it is not possible for us to predict all such factors, nor can we assess the effect of each such factor on our business or the extent that any such factor or combination of factors may cause actual results to differ materially from those contained in any forward-looking statement.

Available Information

We file annual, quarterly and current reports and proxy statements with the SEC. The SEC maintains a website that contains these documents at www.sec.gov. We make annual, quarterly and current reports and proxy statements available on our website, www.avistacorp.com, as soon as practicable after electronically filing these documents with the SEC. Except for SEC filings or portions thereof that are specifically referred to in this report, information contained on these websites is not part of this report.

4

PART I. Financial Information

Item 1. Condensed Consolidated Financial Statements

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands, except per share amounts

(Unaudited)

	2021			2020
Operating Revenues:
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$	412,182		$	393,820
Alternative revenue programs		499			(4,413	)
Total utility revenues		412,681			389,407
Non-utility revenues		189			823
Total operating revenues		412,870			390,230
Operating Expenses:
Utility operating expenses:
Resource costs		134,579			129,547
Other operating expenses		87,555			94,496
Depreciation and amortization		55,221			51,421
Taxes other than income taxes		32,309			30,978
Non-utility operating expenses:
Other operating expenses		1,184			1,360
Depreciation and amortization		127			235
Total operating expenses		310,975			308,037
Income from operations		101,895			82,193
Interest expense		26,304			26,347
Interest expense to affiliated trusts		109			270
Capitalized interest		(1,015	)		(998	)
Other income-net		(3,684	)		(382	)
Income before income taxes		80,181			56,956
Income tax expense		12,164			8,532
Net income	$	68,017		$	48,424
Weighted-average common shares outstanding (thousands), basic		69,293			67,239
Weighted-average common shares outstanding (thousands), diluted		69,506			67,381
Earnings per common share:
Basic	$	0.98		$	0.72
Diluted	$	0.98		$	0.72

The Accompanying Notes are an Integral Part of These Statements.

5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands

(Unaudited)

	2021		2020
Net income	$	68,017	$	48,424
Other Comprehensive Income:
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $84 and $54 respectively		315		205
Total other comprehensive income		315		205
Comprehensive income	$	68,332	$	48,629

The Accompanying Notes are an Integral Part of These Statements.

6

CONDENSED CONSOLIDATED BALANCE SHEETS

Avista Corporation

Dollars in thousands

(Unaudited)

	March 31,			December 31,
	2021			2020
Assets:
Current Assets:
Cash and cash equivalents	$	21,647		$	14,196
Accounts and notes receivable-less allowances of $12,139 and $11,387, respectively		153,128			163,772
Materials and supplies, fuel stock and stored natural gas		63,160			67,451
Regulatory assets		29,225			13,673
Other current assets		82,922			84,885
Total current assets		350,082			343,977
Net utility property		5,027,103			4,991,612
Goodwill		52,426			52,426
Non-current regulatory assets		705,921			750,443
Other property and investments-net and other non-current assets		263,964			263,639
Total assets	$	6,399,496		$	6,402,097
Liabilities and Equity:
Current Liabilities:
Accounts payable	$	93,100		$	106,613
Short-term borrowings		193,000			203,000
Regulatory liabilities		45,067			46,435
Other current liabilities		161,632			149,831
Total current liabilities		492,799			505,879
Long-term debt		2,008,742			2,008,534
Long-term debt to affiliated trusts		51,547			51,547
Pensions and other postretirement benefits		199,670			211,880
Deferred income taxes		607,707			594,712
Non-current regulatory liabilities		783,784			784,820
Other non-current liabilities and deferred credits		186,657			214,999
Total liabilities		4,330,906			4,372,371
Commitments and Contingencies (See Notes to Condensed Consolidated    Financial Statements)
Equity:
Shareholders’ Equity:
Common stock, no par value; 200,000,000 shares authorized; 69,313,337 and    69,238,901 shares issued and outstanding, respectively		1,285,999			1,286,068
Accumulated other comprehensive loss		(14,063	)		(14,378	)
Retained earnings		796,654			758,036
Total shareholders’ equity		2,068,590			2,029,726
Total liabilities and equity	$	6,399,496		$	6,402,097

The Accompanying Notes are an Integral Part of These Statements.

7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

Avista Corporation

For the Three Months Ended March 31,

Dollars in thousands

(Unaudited)

	2021			2020
Operating Activities:
Net income	$	68,017		$	48,424
Non-cash items included in net income:
Depreciation and amortization		55,348			51,421
Deferred income tax provision and investment tax credits		5,966			(6,765	)
Power and natural gas cost amortizations (deferrals), net		(7,811	)		6,380
Amortization of debt expense		823			653
Stock-based compensation expense		626			872
Equity-related AFUDC		(1,754	)		(1,599	)
Pension and other postretirement benefit expense		7,556			7,952
Other regulatory assets and liabilities and deferred debits and credits		1,762			11,902
Change in decoupling regulatory deferral		(682	)		4,155
Gain on sale of investments		(155	)		(3,242	)
Other		(2,828	)		5,112
Contributions to defined benefit pension plan		(14,000	)		(7,300	)
Changes in certain current assets and liabilities:
Accounts and notes receivable		6,728			6,078
Materials and supplies, fuel stock and stored natural gas		4,291			9,901
Collateral posted for derivative instruments		1,497			(14,283	)
Income taxes receivable		5,442			10,500
Income taxes payable		557			4,901
Other current assets		(260	)		(2,166	)
Accounts payable		(2,590	)		(19,527	)
Other current liabilities		16,557			21,905
Net cash provided by operating activities		145,090			135,274
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)		(97,203	)		(95,525	)
Issuance of notes receivable		(75	)		(2,779	)
Equity and property investments		(2,340	)		(1,313	)
Proceeds from sale of investments		801			5,148
Other		2,356			(662	)
Net cash used in investing activities		(96,461	)		(95,131	)

The Accompanying Notes are an Integral Part of These Statements.

8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)

Avista Corporation

For the Three Months Ended March 31,

Dollars in thousands

(Unaudited)

	2021			2020
Financing Activities:
Net decrease in short-term borrowings	$	(10,000	)	$	(800	)
Maturity of long-term debt and finance leases		(759	)		(700	)
Issuance of common stock, net of issuance costs		65			175
Cash dividends paid		(29,399	)		(27,389	)
Other		(1,085	)		(2,406	)
Net cash used in financing activities		(41,178	)		(31,120	)
Net increase in cash and cash equivalents		7,451			9,023
Cash and cash equivalents at beginning of period		14,196			9,896
Cash and cash equivalents at end of period	$	21,647		$	18,919

The Accompanying Notes are an Integral Part of These Statements.

9

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands

(Unaudited)

	2021			2020
Common Stock, Shares:
Shares outstanding at beginning of period		69,238,901			67,176,996
Shares issued		74,436			115,237
Shares outstanding at end of period		69,313,337			67,292,233
Common Stock, Amount:
Balance at beginning of period	$	1,286,068		$	1,210,741
Equity compensation expense		859			804
Issuance of common stock, net of issuance costs		65			175
Payment of minimum tax withholdings for share-based    payment awards		(993	)		(2,408	)
Balance at end of period		1,285,999			1,209,312
Accumulated Other Comprehensive Loss:
Balance at beginning of period		(14,378	)		(10,259	)
Other comprehensive income		315			205
Balance at end of period		(14,063	)		(10,054	)
Retained Earnings:
Balance at beginning of period		758,036			738,802
Net income		68,017			48,424
Cash dividends paid on common stock		(29,399	)		(27,389	)
Balance at end of period		796,654			759,837
Total equity	$	2,068,590		$	1,959,095
Dividends declared per common share	$	0.4225		$	0.4050

The Accompanying Notes are an Integral Part of These Statements.

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AVISTA CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

The accompanying condensed consolidated financial statements of Avista Corp. as of and for the interim periods ended March 31, 2021 and March 31, 2020 are unaudited; however, in the opinion of management, the statements reflect all adjustments necessary for a fair statement of the results for the interim periods. All such adjustments are of a normal recurring nature. The condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The Condensed Consolidated Statements of Income for the interim periods are not necessarily indicative of the results to be expected for the full year. These condensed consolidated financial statements do not contain the detail or footnote disclosure concerning accounting policies and other matters which would be included in full fiscal year consolidated financial statements; therefore, they should be read in conjunction with the Company's audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (2020 Form 10-K).

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information.

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Regulation

The Company is subject to state regulation in Washington, Idaho, Montana, Oregon and Alaska. The Company is also subject to federal regulation primarily by the FERC, as well as various other federal agencies with regulatory oversight of particular aspects of its operations.

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

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AVISTA CORPORATION

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. See Note 15 for further discussion of the Company's commitments and contingencies.

NOTE 2. NEW ACCOUNTING STANDARDS

There are no new accounting standards with a material impact to the Company.

NOTE 3. BALANCE SHEET COMPONENTS

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Materials and supplies	$	56,368	$	53,258
Fuel stock		4,843		4,658
Stored natural gas		1,949		9,535
Total	$	63,160	$	67,451

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AVISTA CORPORATION

Other Current Assets

Other current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Collateral posted for derivative instruments after netting with outstanding    derivative liabilities	$	4,810	$	4,336
Prepayments		25,984		24,411
Income taxes receivable		44,371		49,814
Other		7,757		6,324
Total	$	82,922	$	84,885

Net Utility Property

Net utility property consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Utility plant in service	$	6,865,652	$	6,809,797
Construction work in progress		193,685		175,767
Total		7,059,337		6,985,564
Less: Accumulated depreciation and amortization		2,032,234		1,993,952
Total net utility property	$	5,027,103	$	4,991,612

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Operating lease ROU assets	$	71,410	$	71,891
Finance lease ROU assets		46,428		47,338
Non-utility property		18,398		19,508
Equity investments		61,132		59,318
Investment in affiliated trust		11,547		11,547
Notes receivable		14,665		14,454
Deferred compensation assets		9,469		9,174
Assets held for sale (1)		3,363		3,462
Other		27,552		26,947
Total	$	263,964	$	263,639

(1)  The Company is in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub.

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AVISTA CORPORATION

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Accrued taxes other than income taxes	$	56,630	$	45,099
Derivative liabilities		8,644		14,008
Employee paid time off accruals		28,775		26,495
Accrued interest		28,920		17,083
Pensions and other postretirement benefits		10,512		11,987
Other		28,151		35,159
Total other current liabilities	$	161,632	$	149,831

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Operating lease liabilities	$	68,276	$	67,716
Finance lease liabilities		48,044		48,815
Deferred investment tax credits		29,728		29,866
Asset retirement obligations		17,126		17,194
Derivative liabilities		8,959		37,427
Other		14,524		13,981
Total	$	186,657	$	214,999

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AVISTA CORPORATION

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	3,637	$	3,237	$	2,073	$	5,722
Decoupling surcharge		18,150		6,812		7,123		17,123
Pension and other postretirement benefit plans		—		196,153		—		198,746
Interest rate swaps		—		177,824		—		214,851
Deferred income taxes		—		111,537		—		108,517
Settlement with Coeur d'Alene Tribe		—		39,764		—		40,043
AFUDC above FERC allowed rate		—		48,270		—		47,393
Demand side management programs		—		904		—		3,814
Utility plant to be abandoned		—		27,599		—		28,916
COVID-19 deferrals		—		11,759		—		8,166
Other regulatory assets		7,438		82,062		4,477		77,152
Total regulatory assets	$	29,225	$	705,921	$	13,673	$	750,443
Regulatory Liabilities
Income tax related liabilities	$	15,013	$	395,859	$	14,952	$	399,677
Deferred power costs		18,955		13,859		20,299		17,570
Decoupling rebate		1,396		1,604		1,447		1,519
Utility plant retirement costs		—		330,897		—		325,832
Interest rate swaps		—		17,218		—		15,046
COVID-19 deferrals		—		11,628		—		10,949
Other regulatory liabilities		9,703		12,719		9,737		14,227
Total regulatory liabilities	$	45,067	$	783,784	$	46,435	$	784,820

NOTE 4. REVENUE

ASC 606 defines the core principle of the revenue recognition model is that an entity should identify the various performance obligations in a contract, allocate the transaction price among the performance obligations and recognize revenue when (or as) the entity satisfies each performance obligation.

Utility Revenues

Revenue from Contracts with Customers

General

The majority of Avista Corp.’s revenue is from rate-regulated sales of electricity and natural gas to retail customers, which has two performance obligations, (1) having service available for a specified period (typically a month at a time) and (2) the delivery of energy to customers. The total energy price generally has a fixed component (basic charge) related to having service available and a usage-based component, related to the delivery and consumption of energy. The commodity is sold and/or delivered to and consumed by the customer simultaneously, and the provisions of the relevant utility commission authorization determine the charges the Company may bill the customer. Given that all revenue recognition criteria are met upon the delivery of energy to customers, revenue is recognized immediately at that time.

Revenues from contracts with customers are presented in the Condensed Consolidated Statements of Income in the line item "Utility revenues, exclusive of alternative revenue programs."

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AVISTA CORPORATION

Non-Derivative Wholesale Contracts

The Company has certain wholesale contracts which are not accounted for as derivatives and, accordingly, are within the scope of ASC 606 and considered revenue from contracts with customers. Revenue is recognized as energy is delivered to the customer or the service is available for a specified period of time, consistent with the discussion of rate-regulated sales above.

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Derivative Revenue

Most wholesale electric and natural gas transactions (including both physical and financial transactions), and the sale of fuel are considered derivatives, which are specifically scoped out of ASC 606. As such, these revenues are disclosed separately from revenue from contracts with customers. Revenue is recognized for these items upon the settlement/expiration of the derivative contract. Derivative revenue includes those transactions that are entered into and settled within the same month.

Other Utility Revenue

Other utility revenue includes rent, sales of materials, late fees and other charges that do not represent contracts with customers. Other utility revenue also includes the provision for earnings sharing and the deferral and amortization of refunds to customers associated with the TCJA. This revenue is scoped out of ASC 606, as this revenue does not represent items where a customer is a party that has contracted with the Company to obtain goods or services that are an output of the Company’s ordinary activities in exchange for consideration. As such, these revenues are presented separately from revenue from contracts with customers.

Other Considerations for Utility Revenues

Gross Versus Net Presentation

Revenues and resource costs from Avista Utilities’ settled energy contracts that are “booked out” (not physically delivered) are reported on a net basis as part of derivative revenues.

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

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AVISTA CORPORATION

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2021		2020
Utility-related taxes	$	19,696	$	18,700

Significant Judgments and Unsatisfied Performance Obligations

The only significant judgments involving revenue recognition are estimates surrounding unbilled revenue and receivables from contracts with customers and estimates surrounding the amount of decoupling revenues that will be collected from customers within 24 months (discussed above).

The Company has certain capacity arrangements, where the Company has a contractual obligation to provide either electric or natural gas capacity to its customers for a fixed fee. Most of these arrangements are paid for in arrears by the customers and do not result in deferred revenue and only result in receivables from the customers. The Company does have one capacity agreement where the customer makes payments throughout the year and, depending on the timing of the customer payments, it can result in an immaterial amount of deferred revenue or a receivable from the customer. As of March 31, 2021, the Company estimates it had unsatisfied capacity performance obligations of $21.2 million, which will be recognized as revenue in future periods as the capacity is provided to the customers. These performance obligations are not reflected in the financial statements, as the Company has not received payment for these services.

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2021			2020
Avista Utilities
Revenue from contracts with customers	$	358,613		$	351,628
Derivative revenues		34,981			31,075
Alternative revenue programs		499			(4,413	)
Deferrals and amortizations for rate refunds to customers		3,189			(2,606	)
Other utility revenues		2,578			1,521
Total Avista Utilities		399,860			377,205
AEL&P
Revenue from contracts with customers		12,779			12,126
Deferrals and amortizations for rate refunds to customers		(47	)		(48	)
Other utility revenues		89			124
Total AEL&P		12,821			12,202
Other revenues		189			823
Total operating revenues	$	412,870		$	390,230

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AVISTA CORPORATION

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's electric operations for the three months ended March 31 (dollars in thousands):

	2021						2020
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
Three months ended March 31,
ELECTRIC OPERATIONS
Revenue from contracts with customers
Residential	$	113,223	$	6,048	$	119,271	$	107,977	$	5,866	$	113,843
Commercial and governmental		76,284		4,772		81,056		78,849		6,199		85,048
Industrial		24,711		1,899		26,610		24,711		—		24,711
Public street and highway lighting		1,852		60		1,912		1,783		61		1,844
Total retail revenue		216,070		12,779		228,849		213,320		12,126		225,446
Transmission		3,495		—		3,495		3,774		—		3,774
Other revenue from contracts with    customers		6,140		—		6,140		5,289		—		5,289
Total electric revenue from contracts with customers	$	225,705	$	12,779	$	238,484	$	222,383	$	12,126	$	234,509

The following table disaggregates revenue from contracts with customers associated with the Company's natural gas operations for the three months ended March 31 (dollars in thousands):

	2021		2020
	Avista Utilities		Avista Utilities
Three months ended March 31,
NATURAL GAS OPERATIONS
Revenue from contracts with customers
Residential	$	87,501	$	84,173
Commercial and governmental		39,775		39,401
Industrial and interruptible		2,224		2,194
Total retail revenue		129,500		125,768
Transportation		2,283		2,352
Other revenue from contracts with    customers		1,125		1,125
Total natural gas revenue from    contracts with customers	$	132,908	$	129,245

NOTE 5. DERIVATIVES AND RISK MANAGEMENT

Energy Commodity Derivatives

Avista Corp. is exposed to market risks relating to changes in electricity and natural gas commodity prices and certain other fuel prices. Market risk is, in general, the risk of fluctuation in the market price of the commodity being traded and is influenced primarily by supply and demand. Market risk includes the fluctuation in the market price of associated derivative commodity instruments. Avista Corp. utilizes derivative instruments, such as forwards, futures, swap derivatives and options, in order to manage the various risks relating to these commodity price exposures. Avista Corp. has an energy resources risk policy and control procedures to manage these risks.

As part of Avista Corp.'s resource procurement and management operations in the electric business, Avista Corp. engages in an ongoing process of resource optimization, which involves the economic selection from available energy resources to serve Avista Corp.'s load obligations and the use of these resources to capture available economic value through wholesale market transactions. These include sales and purchases of electric capacity and energy, fuel for electric generation, and derivative contracts related to capacity, energy and fuel. Such transactions are part of the process of matching resources with load obligations and hedging a portion of the related financial risks. These transactions range from terms of intra-hour up to multiple years.

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AVISTA CORPORATION

As part of its resource procurement and management of its natural gas business, Avista Corp. makes continuing projections of its natural gas loads and assesses available natural gas resources including natural gas storage availability. Natural gas resource planning typically includes peak requirements, low and average monthly requirements and delivery constraints from natural gas supply locations to Avista Corp.’s distribution system. However, daily variations in natural gas demand can be significantly different than monthly demand projections. On the basis of these projections, Avista Corp. plans and executes a series of transactions to hedge a portion of its projected natural gas requirements through forward market transactions and derivative instruments. These transactions may extend as much as three natural gas operating years (November through October) into the future. Avista Corp. also leaves a significant portion of its natural gas supply requirements unhedged for purchase in short-term and spot markets.

Avista Corp. plans for sufficient natural gas delivery capacity to serve its retail customers for a theoretical peak day event. Avista Corp. generally has more pipeline and storage capacity than what is needed during periods other than a peak-day. Avista Corp. optimizes its natural gas resources by using market opportunities to generate economic value that mitigates the fixed costs. Avista Corp. also optimizes its natural gas storage capacity by purchasing and storing natural gas when prices are traditionally lower, typically in the summer, and withdrawing during higher priced months, typically during the winter. However, if market conditions and prices indicate that Avista Corp. should buy or sell natural gas at other times during the year, Avista Corp. engages in optimization transactions to capture value in the marketplace. Natural gas optimization activities include, but are not limited to, wholesale market sales of surplus natural gas supplies, purchases and sales of natural gas to optimize use of pipeline and storage capacity, and participation in the transportation capacity release market.

The following table presents the underlying energy commodity derivative volumes as of March 31, 2021 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
Remainder 2021		3		92		7,434		48,028		40		754		8,045		29,520
2022		—		—		450		29,345		—		—		1,360		12,950
2023		—		—		—		6,920		—		—		1,360		1,970
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of March 31, 2021, there are no expected deliveries of energy commodity derivatives after 2025.

The following table presents the underlying energy commodity derivative volumes as of December 31, 2020 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
2021		1		224		10,353		65,188		17		451		5,448		39,273
2022		—		—		450		25,525		—		—		1,360		12,030
2023		—		—		—		4,950		—		—		1,360		900
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of December 31, 2020, there are no expected deliveries of energy commodity derivatives after 2025.

(1) Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

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AVISTA CORPORATION

The electric and natural gas derivative contracts above will be included in either power supply costs or natural gas supply costs during the period they are scheduled to be delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA and PGAs), or in the general rate case process, and are expected to be collected through retail rates from customers.

Foreign Currency Exchange Derivatives

A significant portion of Avista Corp.’s natural gas supply (including fuel for power generation) is obtained from Canadian sources. Most of those transactions are executed in U.S. dollars, which avoids foreign currency risk. A portion of Avista Corp.’s short-term natural gas transactions and long-term Canadian transportation contracts are committed based on Canadian currency prices. The short-term natural gas transactions are settled within 60 days with U.S. dollars. Avista Corp. hedges a portion of the foreign currency risk by purchasing Canadian currency exchange derivatives when such commodity transactions are initiated. The foreign currency exchange derivatives and the unhedged foreign currency risk have not had a material effect on Avista Corp.’s financial condition, results of operations or cash flows and these differences in cost related to currency fluctuations are included with natural gas supply costs for ratemaking.

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Number of contracts		25		22
Notional amount (in United States dollars)	$	4,916	$	3,860
Notional amount (in Canadian dollars)		6,178		4,949

Interest Rate Swap Derivatives

Avista Corp. is affected by fluctuating interest rates related to a portion of its existing debt, and future borrowing requirements. Avista Corp. hedges a portion of its interest rate risk with financial derivative instruments, which may include interest rate swap derivatives and U.S. Treasury lock agreements. These interest rate swap derivatives and U.S. Treasury lock agreements are considered economic hedges against fluctuations in future cash flows associated with anticipated debt issuances.

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Balance Sheet Date	Number of Contracts		Notional Amount		Mandatory Cash Settlement Date
March 31, 2021		4		45,000	2021
		12		130,000	2022
		1		10,000	2023
December 31, 2020		4		45,000	2021
		11		120,000	2022
		1		10,000	2023

The fair value of outstanding interest rate swap derivatives can vary significantly from period to period depending on the total notional amount of swap derivatives outstanding and fluctuations in market interest rates compared to the interest rates fixed by the swaps. Avista Corp. is required to make cash payments to settle the interest rate swap derivatives when the fixed rates are higher than prevailing market rates at the date of settlement. Conversely, Avista Corp. receives cash to settle its interest rate swap derivatives when prevailing market rates at the time of settlement exceed the fixed swap rates. 

Summary of Outstanding Derivative Instruments

The amounts recorded on the Condensed Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020 reflect the offsetting of derivative assets and liabilities where a legal right of offset exists.

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AVISTA CORPORATION

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2021 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(22	)	$	—	$	(22	)
Interest rate swap derivatives
Other current assets		1,743		—			—		1,743
Other property and investments-net and other non-current assets		4,613		(3,820	)		—		793
Other current liabilities		—		(10,978	)		3,910		(7,068	)
Other non-current liabilities and deferred credits		1,264		(5,525	)		—		(4,261	)
Energy commodity derivatives
Other current assets		749		(24	)		—		725
Other property and investments-net and other non-current assets		2,598		(1,136	)		—		1,462
Other current liabilities		17,458		(21,820	)		2,786		(1,576	)
Other non-current liabilities and deferred credits		95		(4,793	)		—		(4,698	)
Total derivative instruments recorded on the balance sheet	$	28,520	$	(48,118	)	$	6,696	$	(12,902	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2020 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current assets	$	30	$	—		$	—	$	30
Interest rate swap derivatives
Other current liabilities		—		(19,575	)		8,050		(11,525	)
Other non-current liabilities and deferred credits		952		(32,190	)		—		(31,238	)
Energy commodity derivatives
Other current assets		9,203		(8,306	)		—		897
Other property and investments-net and other non-current assets		1,755		(1,159	)		—		596
Other current liabilities		11,037		(14,007	)		487		(2,483	)
Other non-current liabilities and deferred credits		1,725		(8,043	)		129		(6,189	)
Total derivative instruments recorded on the balance sheet	$	24,702	$	(83,280	)	$	8,666	$	(49,912	)

Exposure to Demands for Collateral

Avista Corp.'s derivative contracts often require collateral (in the form of cash or letters of credit) or other credit enhancements, or reductions or terminations of a portion of the contract through cash settlement. In the event of a downgrade in Avista Corp.'s credit ratings or changes in market prices, additional collateral may be required. In periods of price volatility, the level of exposure can change significantly. As a result, sudden and significant demands may be made against Avista Corp.'s credit facilities and cash. Avista Corp. actively monitors the exposure to possible collateral calls and takes steps to mitigate capital requirements.

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The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Energy commodity derivatives
Cash collateral posted	$	7,596	$	4,953
Letters of credit outstanding		12,500		23,500
Balance sheet offsetting		2,786		616
Interest rate swap derivatives
Cash collateral posted (offset by net derivative positions)		3,910		8,050

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features		14,956		50,813
Additional collateral to post		11,046		42,763

NOTE 6. PENSION PLANS AND OTHER POSTRETIREMENT BENEFIT PLANS

Avista Utilities

Avista Utilities’ maintained the same pension and other postretirement plans during the three months ended March 31, 2021 as those described as of December 31, 2020. The Company’s funding policy is to contribute at least the minimum amounts that are required to be funded under the Employee Retirement Income Security Act, but not more than the maximum amounts that are currently deductible for income tax purposes. The Company contributed $14 million in cash to the pension plan for the three months ended March 31, 2021 and it expects to contribute $42 million in 2021.

The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2021			2020			2021			2020
Service cost	$	6,246		$	5,546		$	1,008		$	979
Interest cost		6,580			6,971			1,376			1,515
Expected return on plan assets		(9,775	)		(9,125	)		(675	)		(630	)
Amortization of prior service cost		75			75			(275	)		(275	)
Net loss recognition		1,823			1,654			1,173			1,243
Net periodic benefit cost	$	4,949		$	5,121		$	2,607		$	2,832

Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.

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The non-service portion of costs in the table above are recorded to other expense below income from operations in the Condensed Consolidated Statements of Income or capitalized as a regulatory asset. Approximately 40 percent of the costs are capitalized to regulatory assets and 60 percent is expensed to the income statement.

NOTE 7. INCOME TAXES

In accordance with interim reporting requirements, the Company uses an estimated annual effective tax rate for computing its provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual tax rate is applied to year-to-date pre-tax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period’s year-to-date amount.

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2021					2020
Federal income taxes at statutory rates	$	16,838		21.0	%	$	11,961		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility       plant differences		(3,240	)	(4.0	)		(2,402	)	(4.2	)
State income tax expense		552		0.7			1,227		2.1
Settlement of equity awards		930		1.1			165		0.3
Other		(2,916	)	(3.6	)		(2,419	)	(4.2	)
Total income tax expense	$	12,164		15.2	%	$	8,532		15.0	%

NOTE 8. COMMITTED LINES OF CREDIT

Avista Corp.

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million with an expiration date of April 2022, with the option to extend for an additional one year period (subject to customary conditions). The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit.

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,			December 31,
	2021			2020
Balance outstanding at end of period	$	93,000		$	102,000
Letters of credit outstanding at end of period	$	16,618		$	27,618
Average interest rate at end of period		1.17	%		1.22	%

As of March 31, 2021 and December 31, 2020, the borrowings outstanding under Avista Corp.'s committed line of credit were classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

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AVISTA CORPORATION

AEL&P

AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2024. As of March 31, 2021 and December 31, 2020, there were borrowings of $0 and $1.0 million, respectively, and there were no letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

NOTE 9. CREDIT AGREEMENT

In April 2020, the Company entered into a one-year Credit Agreement with various financial institutions, in the amount of $100 million. The Company borrowed the entire $100.0 million in April 2020 and repaid the outstanding balance in April 2021.

NOTE 10. LONG-TERM DEBT TO AFFILIATED TRUSTS

In 1997, the Company issued Floating Rate Junior Subordinated Deferrable Interest Debentures, Series B, with a principal amount of $51.5 million to Avista Capital II, an affiliated business trust formed by the Company. Avista Capital II issued $50.0 million of Preferred Trust Securities with a floating distribution rate of LIBOR plus 0.875 percent, calculated and reset quarterly.

The distribution rates paid were as follows during the three months ended March 31, 2021 and the year ended December 31, 2020:

	March 31,			December 31,
	2021			2020
Low distribution rate		1.07	%		1.10	%
High distribution rate		1.10	%		2.79	%
Distribution rate at the end of the period		1.07	%		1.10	%

Concurrent with the issuance of the Preferred Trust Securities, Avista Capital II issued $1.5 million of Common Trust Securities to the Company. The Preferred Trust Securities may be redeemed at the option of Avista Capital II at any time and mature on June 1, 2037. In December 2000, the Company purchased $10.0 million of these Preferred Trust Securities.

The Company owns 100 percent of Avista Capital II and has solely and unconditionally guaranteed the payment of distributions on, and redemption price and liquidation amount for, the Preferred Trust Securities to the extent that Avista Capital II has funds available for such payments from the respective debt securities. Upon maturity or prior redemption of such debt securities, the Preferred Trust Securities will be mandatorily redeemed. The Company does not include these capital trusts in its consolidated financial statements as Avista Corp. is not the primary beneficiary. As such, the sole assets of the capital trusts are $51.5 million of junior subordinated deferrable interest debentures of Avista Corp., which are reflected on the Condensed Consolidated Balance Sheets. Interest expense to affiliated trusts in the Condensed Consolidated Statements of Income represents interest expense on these debentures.

NOTE 11. FAIR VALUE

The carrying values of cash and cash equivalents, accounts and notes receivable, accounts payable, and short-term borrowings are reasonable estimates of their fair values. Long-term debt (including current portion and material capital leases) and long-term debt to affiliated trusts are reported at carrying value on the Condensed Consolidated Balance Sheets.

The fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to fair values derived from unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. Active markets are those in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.

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AVISTA CORPORATION

Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, but which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

Level 3 – Pricing inputs include significant inputs that are generally unobservable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.

Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The determination of the fair values incorporates various factors that not only include the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit), but also the impact of Avista Corp.’s nonperformance risk on its liabilities.

The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	963,500	$	1,129,375	$	963,500	$	1,189,824
Long-term debt (Level 3)		1,060,000		1,081,300		1,060,000		1,235,248
Snettisham finance lease obligation (Level 3)		51,016		51,000		51,750		58,700
Long-term debt to affiliated trusts (Level 3)		51,547		43,815		51,547		43,815

These estimates of fair value of long-term debt and long-term debt to affiliated trusts were primarily based on available market information, which generally consists of estimated market prices from third party brokers for debt with similar risk and terms. The price ranges obtained from the third party brokers consisted of par values of 85.00 to 136.39, where a par value of 100.0 represents the carrying value recorded on the Condensed Consolidated Balance Sheets. Level 2 long-term debt represents publicly issued bonds with quoted market prices; however, due to their limited trading activity, they are classified as Level 2 because brokers must generate quotes and make estimates if there is no trading activity near a period end. Level 3 long-term debt consists of private placement bonds and debt to affiliated trusts, which typically have no secondary trading activity. Fair values in Level 3 are estimated based on market prices from third party brokers using secondary market quotes for debt with similar risk and terms to generate quotes for Avista Corp. bonds. Due to the unique nature of the Snettisham finance lease obligation, the estimated fair value of these items was determined based on a discounted cash flow model using available market information. The Snettisham finance lease obligation was discounted to present value using the Morgan Markets A Ex-Fin discount rate as published on March 31, 2021 and December 31, 2020.

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AVISTA CORPORATION

The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 at fair value on a recurring basis (dollars in thousands):

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2021
Assets:
Energy commodity derivatives	$	—	$	20,805	$	—	$	(18,618	)	$	2,187
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		95		(95	)		—
Interest rate swap derivatives		—		7,620		—		(5,084	)		2,536
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,154		—		—		—			2,154
Equity securities (2)		7,115		—		—		—			7,115
Total	$	9,269	$	28,425	$	95	$	(23,797	)	$	13,992
Liabilities:
Energy commodity derivatives	$	—	$	21,477	$	—	$	(21,404	)	$	73
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		6,296		(95	)		6,201
Foreign currency exchange derivatives		—		22		—		—			22
Interest rate swap derivatives		—		20,323		—		(8,994	)		11,329
Total	$	—	$	41,822	$	6,296	$	(30,493	)	$	17,625
December 31, 2020
Assets:
Energy commodity derivatives	$	—	$	23,645	$	—	$	(22,152	)	$	1,493
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		75		(75	)		—
Foreign currency exchange derivatives		—		30		—		—			30
Interest rate swap derivatives		—		952		—		(952	)		—
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,471		—		—		—			2,471
Equity securities (2)		6,228		—		—		—			6,228
Total	$	8,699	$	24,627	$	75	$	(23,179	)	$	10,222
Liabilities:
Energy commodity derivatives	$	—	$	23,030	$	—	$	(22,768	)	$	262
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		8,485		(75	)		8,410
Interest rate swap derivatives		—		51,765		—		(9,002	)		42,763
Total	$	—	$	74,795	$	8,485	$	(31,845	)	$	51,435

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

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AVISTA CORPORATION

The difference between the amount of derivative assets and liabilities disclosed in respective levels in the table above and the amount of derivative assets and liabilities disclosed on the Condensed Consolidated Balance Sheets is due to netting arrangements with certain counterparties. See Note 5 for additional discussion of derivative netting.

To establish fair value for energy commodity derivatives, the Company uses quoted market prices and forward price curves to estimate the fair value of energy commodity derivative instruments included in Level 2. In particular, electric derivative valuations are performed using market quotes, adjusted for periods in between quotable periods. Natural gas derivative valuations are estimated using New York Mercantile Exchange pricing for similar instruments, adjusted for basin differences, using market quotes. Where observable inputs are available for substantially the full term of the contract, the derivative asset or liability is included in Level 2.

To establish fair values for interest rate swap derivatives, the Company uses forward market curves for interest rates for the term of the swaps and discounts the cash flows back to present value using an appropriate discount rate. The discount rate is calculated by third party brokers according to the terms of the swap derivatives and evaluated by the Company for reasonableness, with consideration given to the potential non-performance risk by the Company. Future cash flows of the interest rate swap derivatives are equal to the fixed interest rate in the swap compared to the floating market interest rate multiplied by the notional amount for each period.

To establish fair value for foreign currency derivatives, the Company uses forward market curves for Canadian dollars against the US dollar and multiplies the difference between the locked-in price and the market price by the notional amount of the derivative. Forward foreign currency market curves are provided by third party brokers. The Company's credit spread is factored into the locked-in price of the foreign exchange contracts.

Deferred compensation assets and liabilities represent funds held by the Company in a Rabbi Trust for an executive deferral plan. These funds consist of actively traded equity and bond funds with quoted prices in active markets. The balance disclosed in the table above excludes cash and cash equivalents of $0.2 million and $0.5 million as of March 31, 2021 and December 31, 2020, respectively.

Level 3 Fair Value

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2021 (dollars in thousands):

	Fair Value (Net) at			Valuation	Unobservable	Range and Weighted
	March 31, 2021			Technique	Input	Average Price
Natural gas exchange agreement	$	(6,201	)	Internally derived weighted average cost of gas	Forward purchase	$1.84 - $2.85/mmBTU $2.21 Weighted Average
					Forward sales prices	$1.90 - $4.25/mmBTU $3.53 Weighted Average
					Purchase volumes	130,000 - 310,000 mmBTUs
					Sales volumes	75,000 - 310,000 mmBTUs

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AVISTA CORPORATION

The following table presents activity for energy commodity derivative assets (liabilities) measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31 (dollars in thousands):

	Natural Gas Exchange Agreement
Three months ended March 31, 2021:
Balance as of January 1, 2021	$	(8,410	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		3,220
Settlements		(1,011	)
Ending balance as of March 31, 2021 (2)	$	(6,201	)
Three months ended March 31, 2020:
Balance as of January 1, 2020	$	(2,976	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		485
Settlements		238
Ending balance as of March 31, 2020 (2)	$	(2,253	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

NOTE 12. COMMON STOCK

The Company has authority to issue a maximum of approximately 3.2 million shares under its sales agency agreements, of which approximately 1.3 million shares remain unissued as of March 31, 2021. The Company has board authority, and has requested regulatory authority, to issue 3.0 million shares in addition to the 1.3 million shares previously authorized but remaining unissued. During the three months ended March 31, 2021 and March 31, 2020, the Company did not issue shares under the sales agency agreements.

NOTE 13. ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Unfunded benefit obligation for pensions and other postretirement benefit plans -    net of taxes of $3,738 and $3,822, respectively	$	14,063	$	14,378

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The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands):

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income)	2021			2020
Amortization of defined benefit pension items
Amortization of net prior service cost (a)	$	(200	)	$	(200	)
Amortization of net loss (a)		3,191			3,100
Adjustment due to effects of regulation (a)		(2,592	)		(2,641	)
Total before tax (b)		399			259
Tax expense (b)		(84	)		(54	)
Net of tax (b)	$	315		$	205

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details).

(b) Description is also the affected line item on the Condensed Consolidated Statement of Income.

NOTE 14. EARNINGS PER COMMON SHARE

The following table presents the computation of basic and diluted earnings per common share for the three months ended March 31 (in thousands, except per share amounts):

	2021		2020
Numerator:
Net income	$	68,017	$	48,424
Denominator:
Weighted-average number of common shares outstanding-basic		69,293		67,239
Effect of dilutive securities:
Performance and restricted stock awards		213		142
Weighted-average number of common shares outstanding-diluted		69,506		67,381
Earnings per common share:
Basic	$	0.98	$	0.72
Diluted	$	0.98	$	0.72

There were no shares excluded from the calculation because they were antidilutive.

NOTE 15. COMMITMENTS AND CONTINGENCIES

In the course of its business, the Company becomes involved in various claims, controversies, disputes and other contingent matters, including the items described in this Note. Some of these claims, controversies, disputes and other contingent matters involve litigation or other contested proceedings. For all such matters, the Company intends to vigorously protect and defend its interests and pursue its rights. However, no assurance can be given as to the ultimate outcome of any particular matter because litigation and other contested proceedings are inherently subject to numerous uncertainties. For matters that affect Avista Utilities’ or AEL&P's operations, the Company intends to seek, to the extent appropriate, recovery of incurred costs through the ratemaking process.

Boyds Fire (State of Washington Department of Natural Resources v. Avista)

In August 2019, the Company was served with a complaint, captioned “State of Washington Department of Natural Resources v. Avista Corporation,” seeking recovery up to $4.4 million for fire suppression and investigation costs and related expenses incurred in connection with a wildfire that occurred in Ferry County, Washington in August 2018. Specifically, the complaint alleges that the fire, which became known as the “Boyds Fire,” was caused by a dead ponderosa pine tree falling into an overhead distribution line, and that Avista Corp. was negligent in failing to identify and remove the tree before it came into contact with the line. Avista Corp.

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disputes that the tree in question was the cause of the fire and that it was negligent in failing to identify and remove it. Additional lawsuits have subsequently been filed by private landowners seeking property damages, and holders of insurance subrogation claims seeking recovery of insurance proceeds paid.

The lawsuits were filed in the Superior Court of Ferry County, Washington and subsequently consolidated into a single action. The Company intends to vigorously defend itself in the litigation. However, the Company cannot predict the outcome of these matters. 

Labor Day Windstorm

In September 2020, a severe windstorm occurred in eastern Washington and northern Idaho. The extreme weather event resulted in customer outages and the cause of multiple wildfires in the region. With respect to wildfires, the Company’s investigation determined that the primary cause of the fires was extreme high winds. To date, the Company has not found any evidence that the fires were caused by any deficiencies in its equipment, maintenance activities or vegetation management practices.

The Company has become aware of instances where, during the course of the storm, otherwise healthy trees and limbs, located in areas outside its maintenance right-of-way, broke under the extraordinary wind conditions and caused damage to its energy delivery system at or near what is believed to be the potential area of origin of a wildfire. Those instances include what has been referred to as: the Babb Road fire (near Malden and Pine City, Washington); the Christensen Road fire (near Airway Heights, Washington); and the Mile Marker 49 fire (near Orofino, Idaho). These wildfires covered, in total, approximately 22,000 acres. The Company currently estimates approximately 230 residential, commercial and other structures were impacted. Parallel investigations by applicable state agencies, including the Washington Department of Natural Resources, are ongoing, and the Company is cooperating with those efforts.

The Company’s investigation has found no evidence of negligence with respect to any of the fires, and the Company intends to vigorously defend any claims for damages that may be asserted against it with respect to the wildfires arising out of the extreme wind event.

Colstrip

The Washington CETA imposes deadlines by which coal-fired resources, such as Colstrip, must be excluded from the rate base of Washington utilities and by which electricity from such resources may no longer be delivered to Washington retail customers. Not all of the co-owners of Colstrip Units 3 & 4 are Washington utilities subject to CETA, and the co-owners have differing needs for the generating capacity of these units. Accordingly, business disagreements have arisen among the co-owners, including, but not limited to, disagreements as to the shut-down date or dates of these units. These business disagreements, in turn, have led to disagreements as to the interpretation of the Ownership and Operating Agreement, including, but not limited to, the rights of the co-owners to discontinue operations of, or otherwise terminate their interest in, Unit 3 and/or Unit 4. In order to address and resolve these disagreements, the owners have commenced an arbitration proceeding as provided for in the Ownership and Operating Agreement.

In the course of the 2021 legislative session, the Montana Legislature passed two bills specifically directed at the ownership and operation of Colstrip. The first, Montana Senate Bill 265, purports to amend Section 27-5-323 of the Montana Code to provide that an agreement designating venue or disputes involving an electric generation facility located in Montana is not valid unless it requires arbitration in Montana before a panel of three arbitrators. The Ownership and Operating Agreement for Colstrip Units 3 & 4 includes an arbitration provision, through which all owners agreed to resolve disputes regarding the Agreement through arbitration in Spokane County, Washington before a single arbitrator. The Company, together with Puget Sound Energy, Portland General Electric, and PacifiCorp (Pacific Northwest Colstrip owners), has commenced an action in Spokane County Superior Court to compel arbitration of the pending disputes regarding interpretation of the Ownership & Operating Agreement in accordance with the requirements of the parties’ Agreement. The Pacific Northwest Colstrip owners have also commenced action in the U.S. District Court for the District of Montana to challenge the legality and constitutionality of the legislation.  

The Montana Legislature has also passed Montana Senate Bill 266, which would make it an unfair or deceptive act or practice, within the meaning of Montana’s Consumer Protection Act, for one or more owners of a jointly owned electrical generation facility to fail to fund its share of operating costs associated with that facility, or to engage in any conduct that would bring about a permanent closure

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of one or more generating units of such a facility without first obtaining the consent of all co-owners of that facility. The Company intends to challenge the legality and constitutionality of this bill as well.

The Company is not able to predict the outcome, nor an amount or range of potential impact in the event of an outcome that is adverse to the Company’s interests.

Other Contingencies

In the normal course of business, the Company has various other legal claims and contingent matters outstanding. The Company believes that any ultimate liability arising from these actions will not have a material impact on its financial condition, results of operations or cash flows. It is possible that a change could occur in the Company’s estimates of the probability or amount of a liability being incurred. Such a change, should it occur, could be significant. See "Note 22 of the Notes to Consolidated Financial Statements" in the 2020 Form 10-K for additional discussion regarding other contingencies.

NOTE 16. INFORMATION BY BUSINESS SEGMENTS

The business segment presentation reflects the basis used by the Company's management to analyze performance and determine the allocation of resources. The Company's management evaluates performance based on income (loss) from operations before income taxes as well as net income (loss). The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Avista Utilities' business is managed based on the total regulated utility operation; therefore, it is considered one segment. AEL&P is a separate reportable business segment, as it has separate financial reports that are reviewed in detail by the Chief Operating Decision Maker and its operations and risks are sufficiently different from Avista Utilities and the other businesses at AERC that it cannot be aggregated with any other operating segments. The Other category, which is not a reportable segment, includes other investments and operations of various subsidiaries, as well as certain other operations of Avista Capital.

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2021:
Operating revenues	$	399,860	$	12,821		$	412,681	$	189		$	—		$	412,870
Resource costs		133,840		739			134,579		—			—			134,579
Other operating expenses		84,599		2,956			87,555		1,184			—			88,739
Depreciation and amortization		52,724		2,497			55,221		127			—			55,348
Income (loss) from operations		96,693		6,324			103,017		(1,122	)		—			101,895
Interest expense (2)		24,800		1,525			26,325		129			(41	)		26,413
Income taxes		10,718		1,333			12,051		113			—			12,164
Net income		64,058		3,476			67,534		483			—			68,017
Capital expenditures (3)		96,394		809			97,203		28			—			97,231
For the three months ended March 31, 2020:
Operating revenues	$	377,205	$	12,202		$	389,407	$	823		$	—		$	390,230
Resource costs		129,557		(10	)		129,547		—			—			129,547
Other operating expenses		91,279		3,217			94,496		1,360			—			95,856
Depreciation and amortization		48,974		2,447			51,421		235			—			51,656
Income (loss) from operations		76,534		6,246			82,780		(587	)		—			82,193
Interest expense (2)		24,983		1,589			26,572		131			(86	)		26,617
Income taxes		7,404		1,301			8,705		(173	)		—			8,532
Net income (loss)		45,979		3,395			49,374		(950	)		—			48,424
Capital expenditures (3)		94,056		1,470			95,526		109			—			95,635
Total Assets:
As of March 31, 2021:	$	6,031,502	$	270,554		$	6,302,056	$	110,117		$	(12,677	)	$	6,399,496
As of December 31, 2020:	$	6,035,340	$	268,971		$	6,304,311	$	109,658		$	(11,872	)	$	6,402,097

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Including interest expense to affiliated trusts.

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(3) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Directors of

Avista Corporation

Spokane, Washington

Results of Review of Interim Financial Information

We have reviewed the accompanying condensed consolidated balance sheet of Avista Corporation and subsidiaries (the "Company") as of March 31, 2021, the related condensed consolidated statements of income, comprehensive income, equity and cash flows for the three-month periods ended March 31, 2021 and 2020, and the related notes (collectively referred to as the "interim financial information"). Based on our reviews, we are not aware of any material modifications that should be made to the accompanying interim financial information for it to be in conformity with accounting principles generally accepted in the United States of America.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2020, and the related consolidated statements of income, comprehensive income, equity, and cash flows for the year then ended (not presented herein); and in our report dated February 23, 2021, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of December 31, 2020, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Basis for Review Results

This interim financial information is the responsibility of the Company's management. 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 reviews in accordance with standards of the PCAOB. A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ Deloitte & Touche LLP

Portland, Oregon

May 4, 2021

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management’s Discussion and Analysis of Financial Condition and Results of Operations has been prepared in accordance with the SEC’s Regulation S-K for interim financial information and with the instructions to Form 10-Q. This Management’s Discussion and Analysis of Financial Condition and Results of Operations does not contain the full detail or analysis that would accompany financial statements for a full fiscal year; therefore, it should be read in conjunction with the Company's 2020 Form 10-K.

Business Segments

Our business segments have not changed during the three months ended March 31, 2021. See the 2020 Form 10-K as well as “Note 16 of the Notes to Condensed Consolidated Financial Statements” for further information regarding our business segments.

The following table presents net income for each of our business segments (and the other businesses) for the three months ended March 31 (dollars in thousands):

	2021		2020
Avista Utilities	$	64,058	$	45,979
AEL&P		3,476		3,395
Other		483		(950	)
Net income	$	68,017	$	48,424

Executive Level Summary

Overall Results

Avista Utilities' net income for the three months ended March 31, 2021 increased compared to the three months ended March 31, 2020 primarily due to an increase in utility margin (operating revenues less resource costs) as a result of general rate increases in Washington and Oregon and customer growth. In addition, during the first quarter of 2020 we recorded an accrual for customer refunds related to the outcome of the 2015 Washington general rate cases and an expense for disallowed replacement power during an unplanned outage at Colstrip.

AEL&P net income increased slightly, primarily due to a decrease in generation and distribution operating and maintenance costs, which was partially offset by a decrease in margin due to weather that was warmer in the first quarter of 2021 compared to the first quarter of 2020.

The increase in net income at our other businesses was primarily due to increased earnings from our investments.

More detailed explanations of the fluctuations are provided in the results of operations and business segment discussions (Avista Utilities, AEL&P, and the other businesses) that follow this section.

COVID-19 Pandemic

The COVID-19 pandemic has impacted our business, as well as the global, national and local economies. However, as we progress into 2021, we expect an increase in vaccinations and a decrease in COVID-19 cases to make the impacts of the pandemic less severe than the prior year. The pandemic has affected and may continue to affect our results of operations, financial condition, liquidity and cash flows in the following ways:

Results of Operations

During the first quarter of 2021, when compared to normal, we did not experience a material variation in total loads due to COVID-19; however, we did observe increases in residential loads offset by decreases in commercial loads. We expect continued economic recovery and improvement in employment through the remainder of 2021. We have decoupling and other regulatory mechanisms in Washington, Idaho and Oregon, which mitigate the impact of changes in loads and revenues for residential and certain commercial customer classes. Over 90 percent of our utility revenue is covered by regulatory mechanisms.

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Customer disconnections for non-payment in our Washington and Oregon jurisdictions continue to be suspended. In Washington, there is a moratorium on disconnections for residential and commercial customers until July 31, 2021. In Oregon, there is a moratorium on disconnections for residential customers until June 30, 2021.

We are offsetting some of the negative impacts of COVID-19 (primarily an increase in bad debt expense) at Avista Utilities with cost savings and benefits from the Coronavirus Aid, Relief, and Economic Security Act. We have received accounting orders in each of our jurisdictions to defer the recognition of COVID-19 expenses as well as identified cost savings of other COVID-19 related benefits. As of March 31, 2021, we have deferred a cumulative regulatory asset of $11.8 million and a cumulative regulatory liability of $11.6 million for COVID-19 related items among all jurisdictions. As of December 31, 2020, we had deferred a cumulative regulatory asset of $8.2 million and a cumulative regulatory liability of $10.9 million among all jurisdictions.

Financial Condition, Liquidity and Cash Flows

We do not expect the impact of COVID-19 to change our estimate of utility capital expenditures for 2021 or to have a material impact on our operating cash flows as compared to 2020.

After considering the impacts of COVID-19, and the issuances of long-term debt and equity during 2021, we expect net cash flows from operations, together with cash available under our committed lines of credit, to provide adequate resources to fund capital expenditures, dividends, and other contractual commitments.

We cannot predict the duration and severity of the COVID-19 pandemic. The longer and more severe the economic restrictions and business disruption, the greater the impact on our operations, results of operations, financial condition and cash flows.

Regulatory Matters

General Rate Cases

We regularly review the need for electric and natural gas rate changes in each state in which we provide service. We expect to continue to file for rate adjustments to:

• seek recovery of operating costs and capital investments, and

• seek the opportunity to earn reasonable returns as allowed by regulators.

With regards to the timing and plans for future filings, the assessment of our need for rate relief and the development of rate case plans takes into consideration short-term and long-term needs, as well as specific factors that can affect the timing of rate filings. Such factors include, but are not limited to, in-service dates of major capital investments and the timing of changes in major revenue and expense items.

Avista Utilities

Washington General Rate Cases

2019 General Rate Cases

In March 2020, we received an order from the WUTC that approved a partial multi-party settlement agreement. The approved rates were designed to increase annual base electric revenues by $28.5 million, or 5.7 percent, and annual natural gas base revenues by $8.0 million, or 8.5 percent, effective April 1, 2020. The revenue increases incorporate a 9.4 percent return on equity (ROE) with a common equity ratio of 48.5 percent and a rate of return on rate (ROR) base of 7.21 percent.

As part of the WUTC order, we are returning approximately $40 million from the ERM rebate to customers over a two-year period.

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Included in the WUTC order is the acceleration of depreciation of Colstrip Units 3 & 4 to reflect a remaining useful life through December 31, 2025. The order utilizes certain electric tax benefits associated with the 2018 tax reform to partially offset these increased costs. The order also sets aside $3 million for community transition efforts to mitigate the impacts of the eventual closure of Colstrip, half funded by customers and half funded by our shareholders. We recorded this liability and recognized the shareholder portion of the expense in the first quarter of 2020. The funds were issued to the Montana Community Fund in the first quarter of 2021.

Lastly, the order included the extension of electric and natural gas decoupling mechanisms through March 31, 2025, with one modification in that new customers added after any test period will not be decoupled until included in a future test period.

2020 General Rate Cases

In October 2020, we filed electric and natural gas general rate cases with the WUTC. We have requested an overall increase in base electric revenues of $44.2 million (or 8.3 percent), which would be entirely offset by a tax credit to customers of the same amount. Additionally, we have requested an overall increase in base natural gas revenues of $12.8 million (or 12.2 percent), which would be entirely offset by a tax credit to customers of the same amount for a period of time. The revenue increases incorporate a 9.9 percent ROE with a common equity ratio of 50 percent and a ROR of 7.43 percent.

Included in our general rate case requests are the recovery of our Advanced Metering Infrastructure (AMI) project costs. AMI project costs represented 42 percent of our electric base rate request and 54 percent of our natural gas base rate request.

Washington Engrossed Substitute Senate Bill 5295

This bill, which was passed by the Washington legislature, would aid in transforming the regulation of electrical and natural gas companies toward multi-year rate plans and performance-based rate making. The bill includes the following provisions: required multi-year rate plans from 2-4 years in length, methodologies the WUTC may use to minimize regulatory lag in the initial year, and each subsequent year of the rate plan, allow for an out-of-cycle multi-year rate plan should the utility underearn; and starts an investigation into Performance Based Ratemaking Metrics, an initial move that may help to modify the historic test-year ratemaking construct. Ultimately, it will require commissioners, present and future, to effectuate the change.

Idaho General Rate Cases

2021 General Rate Cases

In January 2021, we filed electric and natural gas general rate cases with the IPUC. The proposal is a two-year rate plan, with new rates taking effect September 1, 2021 and September 1, 2022. The electric and natural gas incorporate a proposed ROR on rate base of 7.30 percent with a common equity ratio of 50 percent and a 9.9 percent ROE.

Our request, if approved, is designed to increase annual electric base revenues by $24.8 million, or 10.1 percent, effective September 1, 2021 and $8.7 million, or 3.2 percent, effective September 1, 2022. We are proposing to apply a tax credit to customers that would fully offset the increase for September 1, 2021, resulting in no bill change for customers for a period of time. For natural gas, the rate request is designed to increase annual base revenues by $0.05 million, or 0.1 percent effective September 1, 2021 and $1.0 million, or 2.2 percent effective September 1, 2022. The tax credit to customers for natural gas would more than fully offset the September 1, 2021 increase, resulting in a rate reduction for all customers, and would continue for a ten-year period. We are proposing to offset the majority of the increase for the September 1, 2022 rate change with other deferred customer credits.

Oregon General Rate Cases

2020 General Rate Case

In March 2020, we filed a natural gas general rate case with the OPUC.

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Through several settlement stipulations the parties resolved all issues in the general rate case and in December 2020, the OPUC approved the settlement stipulations.

These stipulations approved by the OPUC increased annual base revenue by $3.9 million, or 5.7 percent, effective January 16, 2021. The approved ROE is 9.4 percent, with a common equity ratio of 50 percent and a ROR of 7.24 percent.

2021 General Rate Case

We expect to file natural gas general rate case with the OPUC in the second half of 2021.

AEL&P

Alaska General Rate Case

AEL&P is required to file its’ next general rate case by August 30, 2022.

Avista Utilities

Purchased Gas Adjustments

PGAs are designed to pass through changes in natural gas costs to Avista Utilities' customers with no change in utility margin (operating revenues less resource costs) or net income. In Oregon, we absorb (cost or benefit) 10 percent of the difference between actual and projected natural gas costs included in retail rates for supply that is not hedged. Total net deferred natural gas costs among all jurisdictions were assets of $3.5 million and $1.4 million as of March 31, 2021 and December 31, 2020, respectively.

Power Cost Deferrals and Recovery Mechanisms

The ERM is an accounting method used to track certain differences between Avista Utilities' actual power supply costs, net of wholesale sales and sales of fuel, and the amount included in base retail rates for our Washington customers. Under the ERM, Avista Utilities makes an annual filing on or before April 1 of each year to provide the opportunity for the WUTC staff and other interested parties to review the prudence of and audit the ERM deferred power cost transactions for the prior calendar year. See the 2020 Form 10-K for a full discussion of the mechanics of the ERM and the various sharing bands. Total net deferred power costs under the ERM were liabilities of $32.8 million and $37.9 million as of March 31, 2021 and December 31, 2020, respectively. These deferred power cost balances represent amounts due to customers. Pursuant to WUTC requirements, should the cumulative deferral balance exceed $30 million in the rebate or surcharge direction, we must make a filing with the WUTC to adjust customer rates to either return the balance to customers or recover the balance from customers.

The cumulative rebate balance exceeds $30 million and as a result, our 2019 filing contained a proposed rate refund. The ERM proceeding was considered with our 2019 general rate case proceeding and a refund was approved and is being returned to customers over a two-year period that began on April 1, 2020. See further discussion in the section "Washington General Rate Cases" above.

Avista Utilities has a PCA mechanism in Idaho that allows us to modify electric rates on October 1 of each year with IPUC approval. Under the PCA mechanism, we defer 90 percent of the difference between certain actual net power supply expenses and the amount included in base retail rates for our Idaho customers. The October 1 rate adjustments recover or rebate power supply costs deferred during the preceding July-June twelve-month period. Total net power supply costs deferred under the PCA mechanism were assets of $3.2 million as of March 31, 2021 and $2.5 million as of December 31, 2020. These deferred power cost balances represent amounts due from customers.

Decoupling Mechanisms

Decoupling (also known as an FCA in Idaho) is a mechanism designed to sever the link between a utility's revenues and consumers' energy usage. In each of our jurisdictions, Avista Utilities' electric and natural gas revenues are adjusted so as to be based on the number of customers in certain customer rate classes and assumed "normal" kilowatt hour and therm sales, rather than being based on actual kilowatt hour and therm sales. The difference between revenues based on the number of customers and "normal" sales and revenues based on actual usage is deferred and either surcharged or rebated to customers beginning in the following year. Only

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residential and certain commercial customer classes are included in our decoupling mechanisms. See the 2020 Form 10-K for a discussion of the mechanisms in each jurisdiction.

Total net cumulative decoupling deferrals among all jurisdictions were regulatory assets of $22.0 million as of March 31, 2021 and $21.3 million as of December 31, 2020. These decoupling assets represent amounts due from customers.

See "Results of Operations - Avista Utilities" for further discussion of the amounts recorded to operating revenues in 2021 and 2020 related to the decoupling mechanisms.

Results of Operations - Overall

The following provides an overview of changes in our Condensed Consolidated Statements of Income. More detailed explanations are provided, particularly for operating revenues and operating expenses, in the business segment discussions (Avista Utilities, AEL&P, and the other businesses) that follow this section.

The balances included below for utility operations reconcile to the Condensed Consolidated Statements of Income.

Three months ended March 31, 2021 compared to the three months ended March 31, 2020

The following graph shows the total change in net income for the first quarter of 2021 compared to the first quarter of 2020, as well as the various factors that caused such change (dollars in millions):

Utility revenues increased at Avista Utilities primarily due to general rate increases in Washington and Oregon and customer growth. During the first quarter of 2020, there was a $4.9 million decrease to revenue due to the outcome of the 2015 Washington general rate cases.

Utility resource costs increased at Avista Utilities due to increased fuel for generation and other fuel costs, as well as higher natural gas purchases. There was an increase at AEL&P due to an increase in deferred power supply expenses.

The decrease in utility operating expenses was primarily due to a decrease in bad debt expense (net of COVID-19 regulatory deferrals in the first quarter of 2021) and an accrual in the first quarter of 2020 for disallowed replacement power during an unplanned outage at Colstrip. The above decreases were partially offset by increases in generation and distribution operating and maintenance costs at Avista Utilities.

Utility depreciation and amortization increased due to additions to utility plant.

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The increase in other was primarily related to gains on investments recognized during the first quarter of 2021.

Income taxes increased primarily due to an increase in income before taxes. Our effective tax rate was 15.2 percent for the first quarter of 2021 compared to 15.0 percent for the first quarter of 2020. See “Note 7 of the Notes to Condensed Consolidated Financial Statements” for further details and a reconciliation of our effective tax rate.

Non-GAAP Financial Measures

The following discussion for Avista Utilities includes two financial measures that are considered “non-GAAP financial measures”: electric utility margin and natural gas utility margin. In the AEL&P section, we include a discussion of utility margin, which is also a non-GAAP financial measure.

Generally, a non-GAAP financial measure is a numerical measure of a company's financial performance, financial position or cash flows that excludes (or includes) amounts that are included (excluded) in the most directly comparable measure calculated and presented in accordance with GAAP. Electric utility margin is electric operating revenues less electric resource costs, while natural gas utility margin is natural gas operating revenues less natural gas resource costs. The most directly comparable GAAP financial measure to electric and natural gas utility margin is utility operating revenues as presented in "Note 16 of the Notes to Condensed Consolidated Financial Statements."

The presentation of electric utility margin and natural gas utility margin is intended to enhance the understanding of operating performance. We use these measures internally and believe they provide useful information to investors in their analysis of how changes in loads (due to weather, economic or other conditions), rates, supply costs and other factors impact our results of operations. Changes in loads, as well as power and natural gas supply costs, are generally deferred and recovered from customers through regulatory accounting mechanisms. Accordingly, the analysis of utility margin generally excludes most of the change in revenue resulting from these regulatory mechanisms. We present electric and natural gas utility margin separately below for Avista Utilities since each business has different cost sources, cost recovery mechanisms and jurisdictions, so we believe that separate analysis is beneficial. These measures are not intended to replace utility operating revenues as determined in accordance with GAAP as an indicator of operating performance. Reconciliations of operating revenues to utility margin are set forth below.

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Results of Operations - Avista Utilities

Three months ended March 31, 2021 compared to the three months ended March 31, 2020

Utility Operating Revenues

The following graphs present Avista Utilities' electric operating revenues and megawatt-hour (MWh) sales for the three months ended March 31, 2021 and 2020 (dollars in millions and MWhs in thousands):

(1) This balance includes public street and highway lighting, which is considered part of retail electric revenues.

Total electric operating revenues in the graph above include intracompany sales of $6.0 million and $6.1 million for the three months ended March 31, 2021 and 2020, respectively.

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The following table presents the current year deferrals and the amortization of prior year decoupling balances that are reflected in utility electric operating revenues for the three months ended March 31 (dollars in thousands):

	Electric Decoupling Revenues
	2021			2020
Current year decoupling deferrals (a)	$	4,326		$	5,131
Amortization of prior year decoupling deferrals (b)		(3,545	)		(4,608	)
Total electric decoupling revenue	$	781		$	523

(a) Positive amounts are increases in decoupling revenue in the current year and will be surcharged to customers in future years. Negative amounts are decreases in decoupling revenue in the current year and will be rebated to customers in future years.

(b) Positive amounts are increases in decoupling revenue in the current year and are related to the amortization of rebate balances that resulted in prior years and are being refunded to customers (causing a corresponding decrease in retail revenue from customers) in the current year. Negative amounts are decreases in decoupling revenue in the current year and are related to the amortization of surcharge balances that resulted in prior years and are being surcharged to customers (causing a corresponding increase in retail revenue from customers) in the current year.

Total electric revenues increased $11.4 million for the first quarter of 2021 as compared to the first quarter of 2020. The primary fluctuations that occurred during the period were as follows:

• a $2.7 million increase in retail electric revenue due to an increase in revenue per MWh (increased revenues $2.5 million) and an increase in total MWhs sold (increased revenues $0.2 million).

o The increase in revenue per MWh was primarily due to a general rate increase in Washington, effective April 1, 2020.

o The increase in total retail MWhs sold was primarily the result of an increase in residential sales volumes and customer growth. This was partially offset by a decrease in commercial sales volumes mostly due to the impact of COVID-19. In addition, weather was colder than the prior year, which increased heating loads. Compared to the first quarter of 2020, residential electric use per customer increased 2 percent and commercial use per customer decreased 5 percent. Heating degree days in Spokane were 3 percent below normal, but 3 percent above the first quarter of 2020.

• a $0.7 million decrease in wholesale electric revenues due to a decrease in sales volumes (decreased revenues $5.2 million), partially offset by an increase in sales prices (increased revenues $4.5 million). The fluctuation in volumes was primarily the result of differences in the available opportunities for us to optimize our generation assets as compared to the prior year.

• a $7.4 million increase in sales of fuel as part of thermal generation resource optimization activities.

• a $0.3 million increase in electric decoupling revenue, with most of the surcharges in 2021 resulting from lower than normal usage for non-residential customers. There were also smaller surcharges to residential customers due to weather that was warmer than normal.

• a $1.7 million increase in other primarily because in the first quarter of 2020, we accrued $1.4 million for customer refunds related to our 2015 Washington general rate case.

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The following graphs present Avista Utilities' natural gas operating revenues and therms delivered for the three months ended March 31, 2021 and 2020 (dollars in millions and therms in thousands):

(1) This balance includes interruptible and industrial revenues, which are considered part of retail natural gas revenues.

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Total natural gas operating revenues in the graph above include intracompany sales of $12.5 million and $12.8 million for the three months ended March 31, 2021 and 2020, respectively.

The following table presents the current year deferrals and the amortization of prior year decoupling balances that are reflected in utility natural gas operating revenues for the three months ended March 31 (dollars in thousands):

	Natural Gas Decoupling Revenues
	2021			2020
Current year decoupling deferrals (a)	$	(1,543	)	$	(3,556	)
Amortization of prior year decoupling deferrals (b)		1,261			(1,380	)
Total natural gas decoupling revenue	$	(282	)	$	(4,936	)

(a) Positive amounts are increases in decoupling revenue in the current year and will be surcharged to customers in future years. Negative amounts are decreases in decoupling revenue in the current year and will be rebated to customers in future years.

(b) Positive amounts are increases in decoupling revenue in the current year and are related to the amortization of rebate balances that resulted in prior years and are being refunded to customers (causing a corresponding decrease in retail revenue from customers) in the current year. Negative amounts are decreases in decoupling revenue in the current year and are related to the amortization of surcharge balances that resulted in prior years and are being surcharged to customers (causing a corresponding increase in retail revenue from customers) in the current year.

Total natural gas revenues increased $10.8 million for the first quarter of 2021 as compared to the first quarter of 2020. The primary fluctuations that occurred during the period were as follows:

• a $3.7 million increase in natural gas retail revenues (including industrial, which is included in other) due to an increase in volumes (increased revenues $3.9 million), partially offset by a decrease in retail rates (decreased revenues $0.2 million).

o Retail natural gas sales volumes increased in the first quarter of 2021 as compared to the first quarter of 2020 primarily due to higher residential, commercial and industrial usage and customer growth. The higher residential usage was primarily due to weather that was colder than the prior year, which increased heating loads. Compared to the first quarter of 2020, residential use per customer increased 3 percent, commercial use per customer increased 0.3 percent and industrial use per customer increased 32 percent. Heating degree days in Spokane were 3 percent

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below normal, but 3 percent above the first quarter of 2020. Heating degree days in Medford were normal but 4 percent below the first quarter of 2020.

o Retail rates decreased due to decoupling rate decreases, partially offset by general rate increases in Oregon, effective January 16, 2021 and Washington, effective April 1, 2020.

• a $2.6 million decrease in wholesale natural gas revenues due to a decrease in volumes of excess gas sold in the wholesale market (decreased revenues $13.7 million), partially offset by an increase in prices (increased revenues $11.1 million). Differences between revenues and costs from sales of resources in excess of retail load requirements and from resource optimization are accounted for through the PGA mechanisms.

• a $4.6 million increase in natural gas decoupling revenue primarily because in 2020, we were amortizing decoupling surcharges, whereas in 2021, we are amortizing decoupling rebates.

• a $5.1 million increase in other primarily because in the first quarter of 2020, we accrued $3.6 million for customer refunds related to our 2015 Washington general rate case.

The following table presents Avista Utilities' average number of electric and natural gas retail customers for the three months ended March 31, 2021 and 2020:

	Electric Customers				Natural Gas Customers
	2021		2020		2021		2020
Residential		354,191		349,368		330,124		326,126
Commercial		43,968		43,300		36,483		36,194
Interruptible		—		—		37		43
Industrial		1,210		1,295		192		241
Public street and highway lighting		649		638		—		—
Total retail customers		400,018		394,601		366,836		362,604

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Utility Resource Costs

The following graphs present Avista Utilities' resource costs for the three months ended March 31, 2021 and 2020 (dollars in millions):

Total electric resource costs in the graph above include intracompany resource costs of $12.5 million and $12.8 million for the three months ended March 31, 2021 and 2020, respectively.

Total electric resource costs increased $2.3 million for the first quarter of 2021 as compared to the first quarter of 2020. The primary fluctuations that occurred during the period were as follows:

• a $1.3 million increase in power purchased due to an increase in the volume of power purchases (increased costs $2.5 million), partially offset by a decrease in wholesale prices (decreased costs $1.2 million). The fluctuation in volumes was primarily the result of differences in the available opportunities for us to optimize our generation assets as compared to the prior year.

• a $4.3 million increase in fuel for generation primarily related to higher natural gas prices during the first quarter as a result of cold weather throughout the country in February and supply constraints during that same time period.

• a $5.9 million increase in other fuel costs. This represents fuel and the related derivative instruments that were purchased for generation but were later sold when conditions indicated that it was more economical to sell the fuel as part of the resource optimization process. When the fuel or related derivative instruments are sold, that revenue is included in sales of fuel.

• a $9.1 million decrease in other electric resource costs, primarily related to increased amortizations associated with the Washington ERM.

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AVISTA CORPORATION

Total natural gas resource costs in the graph above include intracompany resource costs of $6.0 million and $6.1 million for the three months ended March 31, 2021 and 2020, respectively.

Total natural gas resource costs increased $1.5 million for the first quarter of 2021 as compared to the first quarter of 2020 primarily due to the following:

• a $4.7 million increase in natural gas purchased due to an increase in the price of natural gas (increased costs $17.7 million), partially offset by a decrease in volumes (decreased costs $13.0 million).

• a $3.2 million decrease from net amortizations and deferrals of natural gas costs.

Utility Margin

The following table reconciles Avista Utilities' operating revenues, as presented in "Note 16 of the Notes to Condensed Consolidated Financial Statements" to the Non-GAAP financial measure utility margin for the three months ended March 31, 2021 and 2020 (dollars in thousands):

	Electric				Natural Gas				Intracompany						Total
	2021		2020		2021		2020		2021			2020			2021		2020
Operating revenues	$	257,580	$	246,208	$	160,796	$	149,950	$	(18,516	)	$	(18,953	)	$	399,860	$	377,205
Resource costs		77,867		75,531		74,489		72,979		(18,516	)		(18,953	)		133,840		129,557
Utility margin	$	179,713	$	170,677	$	86,307	$	76,971	$	—		$	—		$	266,020	$	247,648

Electric utility margin increased $9.0 million and natural gas utility margin increased $9.3 million.

Electric utility margin increased primarily due to customer growth and a general rate increase in Washington, effective April 1, 2020. In addition, the first quarter of 2020 included an accrual for customer refunds of $1.4 million related to our 2015 Washington general rate case. These was partially offset by an increase in net power supply costs as compared to the prior year; however, in both years, costs were lower than those recovered through our rates (authorized costs). For the first quarter of 2021, we had a $4.3 million pre-tax benefit under the ERM in Washington, compared to a $5.2 million pre-tax benefit for the first quarter of 2020.

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AVISTA CORPORATION

Natural gas utility margin increased primarily due to a general rate increase in Oregon, effective January 16, 2021 and Washington, effective April 1, 2020, and customer growth. Also, the first quarter of 2020 included an accrual for customer refunds of $3.6 million related to our 2015 Washington general rate case.

Intracompany revenues and resource costs represent purchases and sales of natural gas between our natural gas distribution operations and our electric generation operations (as fuel for our generation plants). These transactions are eliminated in the presentation of total results for Avista Utilities and in the condensed consolidated financial statements but are included in the separate results for electric and natural gas presented above.

Results of Operations - Alaska Electric Light and Power Company

Three months ended March 31, 2021 compared to the three months ended March 31, 2020

Net income for AEL&P was $3.5 million for the three months ended March 31, 2021 compared to $3.4 million for the three months ended March 31, 2020.

The following table presents AEL&P's operating revenues, resource costs and resulting utility margin for the three months ended March 31, 2021 (dollars in thousands):

	2021		2020
Operating revenues	$	12,821	$	12,202
Resource costs (benefit)		739		(10	)
Utility margin	$	12,082	$	12,212

Utility margin decreased slightly for 2021, primarily due to warmer temperatures in the first quarter of 2021 compared to the first quarter of 2020.

AEL&P had normal levels of hydroelectric generation during the first quarters of 2021 and 2020. A portion of the sales to interruptible customers is used to reduce the overall cost of power to AEL&P's firm customers. When interruptible sales are below a certain threshold, AEL&P recognizes a regulatory asset and records a reduction to deferred power supply costs (resource costs) to reflect a future billable amount to its firm customers when the cost of power rates are reset.

Results of Operations - Other Businesses

Our other businesses had net income of $0.5 million for the three months ended March 31, 2021 compared to a net loss of $1.0 million for the three months ended March 31, 2020.

The increase in net income primarily relates to investment gains during the first quarter of 2021. Also, during the first quarter of 2020 there was an impairment loss and an accrual for bad debt. We are in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub and we expect the sale to be completed during the second quarter of 2021.

Critical Accounting Policies and Estimates

The preparation of our consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the consolidated financial statements. Changes in these estimates and assumptions are considered reasonably possible and may have a material effect on our consolidated financial statements and thus actual results could differ from the amounts reported and disclosed herein. Our critical accounting policies that require the use of estimates and assumptions were discussed in detail in the 2020 Form 10-K and have not changed materially.

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AVISTA CORPORATION

Liquidity and Capital Resources

Overall Liquidity

Our sources of overall liquidity and the requirements for liquidity have not materially changed in the three months ended March 31, 2021. See the 2020 Form 10-K for further discussion.

In April 2021, we repaid our $100 million credit agreement.

As of April 30, 2021, we had $182.4 million of available liquidity under the Avista Corp. committed line of credit and $25.0 million under the AEL&P committed line of credit. With our $400.0 million credit facility that expires in April 2022 and AEL&P's $25.0 million credit facility that expires in November 2024, we believe that we have adequate liquidity to meet our needs for the next 12 months.

Review of Cash Flow Statement

Operating Activities

Net cash provided by operating activities was $145.1 million for the three months ended March 31, 2021, compared to $135.3 million for the three months ended March 31, 2020. The increase is primarily due to an increase in net income. As compared to 2020, certain net assets and liabilities increased cash provided by operating activities by $14.9 million.

The above increases in net cash provided by operating activities was partially offset by power and natural gas deferrals which increased during 2021 due to higher natural gas prices during the year, which decreased cash flows by $7.8 million, as compared to an increase to operating cash flows of $6.4 million in 2020. Additionally, during the first quarter of 2021 we contributed $14.0 million to the pension plan, compared to $7.3 million in the first quarter of 2020.

Investing Activities

Net cash used in investing activities was $96.5 million for the three months ended March 31, 2021, compared to $95.1 million for the three months ended March 31, 2020. During the three months ended March 31, 2021, we paid $97.2 million for utility capital expenditures compared to $95.5 million for the three months ended March 31, 2020.

Financing Activities

Net cash used by financing activities was $41.2 million for the three months ended March 31, 2021, compared to cash used of $31.1 million for the three months ended March 31, 2020. In the first quarter of 2021, our short-term borrowings decreased $10.0 million compared to a decrease of $0.8 million in the first quarter of 2020.

Capital Resources

Our consolidated capital structure, including the current portion of long-term debt and short-term borrowings consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021					December 31, 2020
	Amount		Percent of total			Amount		Percent of total
Current portion of long-term debt and leases	$	7,229		0.2	%	$	7,184		0.2	%
Short-term borrowings		193,000		4.3	%		203,000		4.6	%
Long-term debt to affiliated trusts		51,547		1.2	%		51,547		1.2	%
Long-term debt and leases		2,125,061		47.8	%		2,125,065		48.0	%
Total debt		2,376,837		53.5	%		2,386,796		54.0	%
Total Avista Corporation shareholders’ equity		2,068,590		46.5	%		2,029,726		46.0	%
Total	$	4,445,427		100.0	%	$	4,416,522		100.0	%

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AVISTA CORPORATION

Our shareholders’ equity increased $38.9 million during the first three months of 2021 primarily due to net income partially offset by dividends.

We need to finance capital expenditures and acquire additional funds for operations from time to time. The cash requirements needed to service our indebtedness, both short-term and long-term, reduce the amount of cash flow available to fund capital expenditures, purchased power, fuel and natural gas costs, dividends and other requirements.

Committed Lines of Credit

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million with an expiration date of April 2022. During the second quarter of 2021, we expect to extend the revolving line of credit agreement to April 2026. The committed line of credit is secured by non-transferable first mortgage bonds we issued to the agent bank that would only become due and payable in the event, and then only to the extent, that we default on our obligations under the committed line of credit.

The Avista Corp. credit facility contains customary covenants and default provisions, including a covenant which does not permit our ratio of “consolidated total debt” to “consolidated total capitalization” to be greater than 65 percent at any time. As of March 31, 2021, we were in compliance with this covenant with a ratio of 53.5 percent.

AEL&P has a $25.0 million committed line of credit that expires in November 2024. As of March 31, 2021, there were no borrowings or letters of credit outstanding under this committed line of credit.

The AEL&P credit facility contains customary covenants and default provisions including a covenant which does not permit the ratio of “consolidated total debt at AEL&P” to “consolidated total capitalization at AEL&P” (including the impact of the Snettisham obligation) to be greater than 67.5 percent at any time. As of March 31, 2021, AEL&P was in compliance with this covenant with a ratio of 52.0 percent.

Balances outstanding and interest rates of borrowings under Avista Corp.'s committed line of credit were as follows as of and for the three months ended March 31 (dollars in thousands):

	2021			2020
Borrowings outstanding at end of period	$	93,000		$	185,000
Letters of credit outstanding at end of period	$	16,618		$	32,983
Maximum borrowings outstanding during the period	$	106,000		$	193,000
Average borrowings outstanding during the period	$	83,956		$	173,684
Average interest rate on borrowings during the period		1.19	%		2.33	%
Average interest rate on borrowings at end of period		1.17	%		1.66	%

As of March 31, 2021, Avista Corp. and its subsidiaries were in compliance with all of the covenants of their financing agreements, and none of Avista Corp.'s subsidiaries constituted a “significant subsidiary” as defined in Avista Corp.'s committed line of credit.

In April 2020, we entered into a one-year credit agreement with two financial institutions in the amount of $100.0 million. We borrowed the entire $100.0 million available under this agreement and repaid the outstanding balance in April 2021.

Liquidity Expectations

During 2021, we expect to issue approximately $120 million of long-term debt and $75 million of equity. We intend to use the proceeds from our debt and equity issuances to refinance maturing long-term debt and fund planned capital expenditures.

After considering the expected issuances of long-term debt and equity during 2021, we expect net cash flows from operations, together with cash available under our committed lines of credit to provide adequate resources to fund capital expenditures, dividends, and other contractual commitments.

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AVISTA CORPORATION

Capital Expenditures

We are making capital investments to enhance service and system reliability for our customers and replace aging infrastructure. Our estimates for 2021 through 2023 have not materially changed during the three months ended March 31, 2021. See the 2020 Form 10-K for further information on our expected capital expenditures.

Off-Balance Sheet Arrangements

As of March 31, 2021, we had $16.6 million in letters of credit outstanding under our $400.0 million committed line of credit, compared to $27.6 million as of December 31, 2020.

Pension Plan

Avista Utilities

In the three months ended March 31, 2021 we contributed $14 million to the pension plan and we expect to contribute a total of $42 million in 2021. We expect to contribute a total of $150 million to the pension plan in the period 2021 through 2025, with annual contributions of $42 million in 2021 and 2022 and $22 million in 2023 to 2025.

The final determination of pension plan contributions for future periods is subject to multiple variables, most of which are beyond our control, including changes to the fair value of pension plan assets, changes in actuarial assumptions (in particular the discount rate used in determining the benefit obligation), or changes in federal legislation. We may change our pension plan contributions in the future depending on changes to any variables, including those listed above.

See "Note 6 of the Notes to Condensed Consolidated Financial Statements" for additional information regarding the pension plan.

Contractual Obligations

Our future contractual obligations have not materially changed during the three months ended March 31, 2021, except for the following:

• In April 2021, we repaid the balance on our $100.0 million credit agreement.

See the 2020 Form 10-K for our contractual obligations.

Environmental Issues and Contingencies

Our environmental issues and contingencies disclosures have not materially changed during the three months ended March 31, 2021 except as discussed below:

Clean Energy Commitment

In April 2019, we announced a goal to serve our customers with 100 percent clean electricity by 2045 and to have a carbon-neutral supply of electricity by the end of 2027. To help achieve our goals and add to our clean electricity portfolio, in the last three years, we have implemented four renewable energy projects on behalf of our customers: the Community Solar project (0.4 MW) in Spokane Valley, Washington (owned by Avista Corp.), the Solar Select project (28 MW) in Lind, Washington (PPA), the Rattlesnake Flat Wind project (144 MW) in Adams County, Washington (PPA), and a PPA for an additional 5 percent of the output from Chelan PUD’s hydroelectric projects. The contract with Chelan PUD begins in 2024. These resources are in addition to our existing clean hydroelectric generation, biomass generation, and additional wind and solar projects.

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AVISTA CORPORATION

To achieve our clean energy goals, we expect that energy storage and other technologies, which are either not currently available or are not cost-effective under a lowest reasonable cost regulatory standard, will advance such that it will allow us to meet our goals while also maintaining reliability and affordability for our customers. If the required technology is not available or not affordable in the future, we may not meet our goals in the desired timeframe. Meeting our clean energy goals may also require accommodation from economic regulatory agencies insofar as the Company may need to acquire emission offsets to meet its goals.

Climate Change

Federal Regulatory Actions

In January 2021, the U.S. Court of Appeals for the District of Columbia Circuit (D.C. Circuit) vacated the Affordable Clean Energy Rule and remanded the record back to the EPA for further consideration consistent with its opinion. The Court also vacated the repeal of the Clean Power Plan (CPP). Subsequently, the EPA indicated, in a February 12, 2021 Memorandum from Acting Assistant Administrator Joseph Goffman that “…EPA understands the decision as leaving neither of those rules, and thus no CAA section 111(d) regulation, in place with respect to greenhouse gas (GHG) emissions from electric generating units (EGUs). As a practical matter, the reinstatement of the CPP would not make sense.”

See the 2020 Form 10-K for further discussion of environmental issues and contingencies.

Colstrip

Colstrip is a coal-fired generating plant in southeastern Montana that includes four units and which is owned by six separate entities. We have a 15 percent ownership interest in Units 3 & 4 and provide financing for our ownership interest in the project. The other owners are Puget Sound Energy, Portland General Electric, NorthWestern Energy, PacifiCorp and Talen Montana (which is also the operator of the plant). In January 2020, the owners of Units 1 & 2, in which we have no ownership, closed those two units. The owners of Units 3 & 4 currently share operating and capital costs pursuant to the terms of an operating agreement among them (the Ownership and Operation Agreement).  

As a result of CETA in Washington and the varied impacts that this law has had on the different co-owners of Colstrip Units 3 & 4, business disagreements have arisen among the co-owners, which in turn has led to disagreements in the interpretation of the Ownership and Operating Agreement. In order to address and resolve these disagreements, the owners have commenced an arbitration proceeding as provided for in the Ownership and Operating Agreement. See “Note 15 of the Notes to Condensed Consolidated Financial Statements” for further discussion surrounding the arbitration proceeding.

WUTC Investigation Request

In response to a letter from several non-governmental organizations, the WUTC issued a Notice of Opportunity to Respond to Request to Initiate Investigation on April 13, 2021, in which it sought comment on whether it should “initiate a proceeding to investigate Colstrip’s ongoing expenses resulting in a ‘clear order or determination from the [WUTC] that continued funding to maintain and operate Colstrip is not consistent with prudent utility practice.’” The Company has responded, requesting that the WUTC deny the request to initiate a proceeding. At this time, we cannot predict whether the WUTC will initiate an investigation.

Montana Legislation Relating to Colstrip

In the course of the 2021 legislative session, the Montana Legislature passed two bills that are specifically directed at the ownership and operation of Colstrip. The Company took legal action against one of the bills and intends to challenge the legality and constitutionality of the other bill. See “Note 15 of the Notes to Condensed Consolidated Financial Statements” for further discussion surrounding Montana legislation.

See the 2020 Form 10-K for further discussion of Colstrip.

Enterprise Risk Management

The material risks to our businesses, and our mitigation process and procedures to address these risks, were discussed in our 2020 Form 10-K and have not materially changed during the three months ended March 31, 2021. See the 2020 Form 10-K.

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Financial Risk

Our financial risks have not materially changed during the three months ended March 31, 2021, other than the changes noted due to COVID-19. Refer to the 2020 Form 10-K. The financial risks included below are required interim disclosures, even if they have not materially changed from December 31, 2020.

Interest Rate Risk

We use a variety of techniques to manage our interest rate risks. We have an interest rate risk policy and have established a policy to limit our variable rate exposures to a percentage of total capitalization. Additionally, interest rate risk is managed by monitoring market conditions when timing the issuance of long-term debt and optional debt redemptions and establishing fixed rate long-term debt with varying maturities. See "Note 5 of the Notes to Condensed Consolidated Financial Statements" for a summary of our interest rate swap derivatives outstanding as of March 31, 2021 and December 31, 2020 and the amount of additional collateral we would have to post in certain circumstances.

Credit Risk

Under the terms of interest rate swap derivatives that we enter into periodically, we may be required to post cash or letters of credit as collateral depending on fluctuations in the fair value of the instrument. A downgrade in our credit ratings could further impact the amount of collateral required. See “Credit Ratings” in the 2020 Form 10-K for further information. As of March 31, 2021, we had interest rate swap derivatives outstanding with a notional amount totaling $185.0 million and we had cash deposited as collateral in the amount of $3.9 million and no letters of credit outstanding for these interest rate swap derivatives. If our credit ratings were lowered to below “investment grade” based on our interest rate swap derivatives outstanding at March 31, 2021, we would potentially be required to post the following additional collateral (in thousands):

	March 31, 2021
Additional collateral taking into account contractual thresholds	$	5,380
Additional collateral without contractual thresholds		11,046

Energy Commodity Risk

Our energy commodity risks have not materially changed during the three months ended March 31, 2021. See the 2020 Form 10-K. The following table presents energy commodity derivative fair values as a net asset or (liability) as of March 31, 2021 that are expected to settle in each respective year (dollars in thousands). There are no expected deliveries of energy commodity derivatives after 2025.

	Purchases									Sales
	Electric Derivatives					Gas Derivatives				Electric Derivatives						Gas Derivatives
Year	Physical (1)			Financial (1)		Physical (1)		Financial (1)		Physical (1)			Financial (1)			Physical (1)			Financial (1)
Remainder 2021	$	(1	)	$	1,366	$	337	$	10,926	$	(1	)	$	(5,924	)	$	(680	)	$	(9,975	)
2022		—			—		320		4,127		—			—			(1,314	)		(2,140	)
2023		—			—		—		429		—			—			(1,461	)		(133	)
2024		—			—		—		—		—			—			(1,548	)		—
2025		—			—		—		—		—			—			(1,203	)		—

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AVISTA CORPORATION

The following table presents energy commodity derivative fair values as a net asset or (liability) as of December 31, 2020 that are expected to be delivered in each respective year (dollars in thousands). There are no expected deliveries of energy commodity derivatives after 2025.

	Purchases											Sales
	Electric Derivatives					Gas Derivatives						Electric Derivatives					Gas Derivatives
Year	Physical (1)		Financial (1)			Physical (1)			Financial (1)			Physical (1)			Financial (1)		Physical (1)			Financial (1)
2021	$	2	$	(414	)	$	(87	)	$	10,549		$	(15	)	$	716	$	(2,152	)	$	(10,672	)
2022		—		—			247			1,920			—			—		(1,697	)		(1,536	)
2023		—		—			—			(122	)		—			—		(1,599	)		(42	)
2024		—		—			—			—			—			—		(1,673	)		—
2025		—		—			—			—			—			—		(1,219	)		—

(1) Physical transactions represent commodity transactions in which we will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

The above electric and natural gas derivative contracts will be included in either power supply costs or natural gas supply costs during the period they are delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA, and PGAs), or in the general rate case process, and are expected to eventually be collected through retail rates from customers.

Future Resource Needs

2021 Electric Integrated Resource Plan

In April 2021, we filed our 2021 Electric Integrated Resource Plan (IRP) with the WUTC and the IPUC. The WUTC and the IPUC review the IRPs and give the public the opportunity to comment. The WUTC and the IPUC do not approve or disapprove of the content in the IRPs; rather they acknowledge that the IRPs were prepared in accordance with applicable standards if that is the case.

Highlights of the 2021 IRP include the following expectations and/or assumptions:

• We have adequate resources between owned and contractually controlled generation, when combined with conservation and market purchases, to meet customer demand through 2025. Our first long-term capacity deficit, net of energy efficiency, is in 2026 and is 12 MW. The deficit increases to 301 MW in 2027.

• New renewable energy, energy storage, demand response, energy efficiency, and upgrades to existing hydropower and biomass plants are integral to our plan.

• Retail sales and residential use per customer forecasts are slightly higher as compared to the 2020 IRP projections. We anticipate customer load growth of 0.3 percent per year.

• Assumes Colstrip no longer included in the portfolio in 2025, consistent with our 2020 IRP.

• New natural gas-fired peakers required for the 2026 capacity need because long-term energy storage is not yet available or as cost effective as initially estimated in the 2020 IRP.

• Demand response programs begin in 2024 and grow to 71 MW by 2045.

• Notwithstanding the 2020 Renewable Request for Proposal process, the first new renewable resource identified in the IRP is in 2023 as a wind project located in Montana. Additional Montana wind is identified in 2024 and 2028.

• The resource strategy moves us closer to achieving our corporate clean electricity goal to provide customers with 100 percent net clean electricity by 2027. Net clean energy is defined as either 100 percent non-carbon emitting resources or investing in or acquiring carbon offsets to net-out emissions created from carbon emitting resources. 

See “Future Resource Needs” in the 2020 Form 10-K for further discussion on the 2020 IRP.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

The information required by this item is set forth in the Enterprise Risk Management section of "Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations" and is incorporated herein by reference.

Item 4. Controls and Procedures

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

The Company has disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended) (Act) that are designed to ensure that information required to be disclosed in the reports it files or submits under the Act is recorded, processed, summarized and reported on a timely basis. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Act is accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. With the participation of the Company’s principal executive officer and principal financial officer, the Company's management evaluated its disclosure controls and procedures as of the end of the period covered by this report. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based upon this evaluation, the Company’s principal executive officer and principal financial officer have concluded that the Company’s disclosure controls and procedures are effective at a reasonable assurance level as of March 31, 2021.

There have been no changes in the Company's internal control over financial reporting that occurred during the first quarter of 2021 that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

PART II. Other Information

Item 1. Legal Proceedings

See “Note 15 of Notes to Condensed Consolidated Financial Statements” in “Part I. Financial Information Item 1. Condensed Consolidated Financial Statements.”

Item 1A. Risk Factors

Refer to the 2020 Form 10-K for disclosure of risk factors that could have a significant impact on our results of operations, financial condition or cash flows and could cause actual results or outcomes to differ materially from those discussed in our reports filed with the SEC (including this Quarterly Report on Form 10-Q), and elsewhere. These risk factors have not materially changed from the disclosures provided in the 2020 Form 10-K with the exception of the following:

In addition to these risk factors, see also “Forward-Looking Statements” for additional factors which could have a significant impact on our operations, results of operations, financial condition or cash flows and could cause actual results to differ materially from those anticipated in such statements.

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Item 6. Exhibits

15	Letter Re: Unaudited Interim Financial Information (1)
31.1	Certification of Chief Executive Officer (Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002) (1)
31.2	Certification of Chief Financial Officer (Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002) (1)
32	Certification of Corporate Officers (Furnished Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002) (2)
101.INS	Inline XBRL Instance Document. The instance document does not appear in the interactive data file because its inline XBRL tags are embedded within the inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
104	Cover page formatted as Inline XBRL and contained in Exhibit 101.
(1)	Filed herewith.
(2)	Furnished herewith.

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AVISTA CORPORATION

SIGNATURE

Pursuant to the requirements 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.

		AVISTA CORPORATION
		(Registrant)
Date:	May 4, 2021	/s/    Mark T. Thies
		Mark T. Thies
		Executive Vice President, Chief Financial Officer, and Treasurer (Principal Financial Officer)

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EX-15

Exhibit 15

May 4, 2021

To the Board of Directors and Shareholders of Avista Corporation

1411 East Mission Ave

Spokane, Washington 99202

We are aware that our report dated May 4, 2021, on our review of interim financial information of Avista Corporation and subsidiaries appearing in this Quarterly report on Form 10-Q for the quarter ended March 31, 2021, is incorporated by reference in Registration Statement Nos. 333-33790, 333-179042 and 333-208986 on Form S-8 and in Registration Statement No. 333-231431 on Form S-3.

/s/ Deloitte & Touche LLP

Portland, Oregon

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Dennis P. Vermillion, certify that:

1. I have reviewed this report on Form 10-Q of Avista Corporation;

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:	May 4, 2021	/s/    Dennis P. Vermillion
		Dennis P. Vermillion
		President and Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Mark T. Thies, certify that:

1. I have reviewed this report on Form 10-Q of Avista Corporation;

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:	May 4, 2021	/s/    Mark T. Thies
		Mark T. Thies
		Executive Vice President,
		Chief Financial Officer, and Treasurer
		(Principal Financial Officer)

EX-32

Exhibit 32

AVISTA CORPORATION

CERTIFICATION OF CORPORATE OFFICERS

(Furnished Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the

Sarbanes-Oxley Act of 2002)

Each of the undersigned, Dennis P. Vermillion, President and Chief Executive Officer of Avista Corporation (the “Company”), and Mark T. Thies, Executive Vice President, Chief Financial Officer and Treasurer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, as amended, and that the information contained therein fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 4, 2021

/s/    Dennis P. Vermillion

Dennis P. Vermillion

President and Chief Executive Officer

/s/    Mark T. Thies

Mark T. Thies

Executive Vice President,

Chief Financial Officer, and Treasurer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Entity Registrant Name	AVISTA CORPORATION
Amendment Flag	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Information, Former Legal or Registered Name	None
City Area Code	509
Entity Incorporation, State or Country Code	WA
Document Transition Report	false
Document Quarterly Report	true
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Entity File Number	1-3701
Entity Tax Identification Number	91-0462470
Entity Address, Address Line One	1411 East Mission Avenue
Entity Address, City or Town	Spokane
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	99202-2600
Local Phone Number	489-0500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000104918
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		69,314,368
Title of 12(b) Security	Common Stock
Trading Symbol	AVA
Security Exchange Name	NYSE

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$ 412,182	$ 393,820
Alternative revenue programs	499	(4,413)
Total utility revenues	412,681	389,407
Non-utility revenues	189	823
Total operating revenues	412,870	390,230
Utility operating expenses:
Resource costs	134,579	129,547
Other operating expenses	87,555	94,496
Depreciation and amortization	55,221	51,421
Taxes other than income taxes	32,309	30,978
Non-utility operating expenses:
Other operating expenses	1,184	1,360
Depreciation and amortization	127	235
Total operating expenses	310,975	308,037
Income from operations	101,895	82,193
Interest expense	26,304	26,347
Interest expense to affiliated trusts	109	270
Capitalized interest	(1,015)	(998)
Other income-net	(3,684)	(382)
Income before income taxes	80,181	56,956
Income tax expense	12,164	8,532
Net income	$ 68,017	$ 48,424
Weighted-average common shares outstanding (thousands), basic	69,293	67,239
Weighted-average common shares outstanding (thousands), diluted	69,506	67,381
Earnings per common share:
Basic	$ 0.98	$ 0.72
Diluted	$ 0.98	$ 0.72

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 68,017	$ 48,424
Other Comprehensive Income:
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $84 and $54 respectively	315	205
Total other comprehensive income	315	205
Comprehensive income	$ 68,332	$ 48,629

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 84	$ 54

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 21,647	$ 14,196
Accounts and notes receivable-less allowances of $12,139 and $11,387, respectively	153,128	163,772
Materials and supplies, fuel stock and stored natural gas	63,160	67,451
Regulatory assets	29,225	13,673
Other current assets	82,922	84,885
Total current assets	350,082	343,977
Net utility property	5,027,103	4,991,612
Goodwill	52,426	52,426
Non-current regulatory assets	705,921	750,443
Other property and investments-net and other non-current assets	263,964	263,639
Total assets	6,399,496	6,402,097
Current Liabilities:
Accounts payable	93,100	106,613
Short-term borrowings	193,000	203,000
Regulatory liabilities	45,067	46,435
Other current liabilities	161,632	149,831
Total current liabilities	492,799	505,879
Long-term debt	2,008,742	2,008,534
Long-term debt to affiliated trusts	51,547	51,547
Pensions and other postretirement benefits	199,670	211,880
Deferred income taxes	607,707	594,712
Non-current regulatory liabilities	783,784	784,820
Other non-current liabilities and deferred credits	186,657	214,999
Total liabilities	4,330,906	4,372,371
Commitments and Contingencies (See Notes to Condensed Consolidated Financial Statements)
Shareholders’ Equity:
Common stock, no par value; 200,000,000 shares authorized; 69,313,337 and 69,238,901 shares issued and outstanding, respectively	1,285,999	1,286,068
Accumulated other comprehensive loss	(14,063)	(14,378)
Retained earnings	796,654	758,036
Total shareholders’ equity	2,068,590	2,029,726
Total liabilities and equity	$ 6,399,496	$ 6,402,097

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Accounts and notes receivable, allowances	$ 12,139	$ 11,387
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares, issued	69,313,337	69,238,901
Common stock, shares outstanding	69,313,337	69,238,901

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income	$ 68,017	$ 48,424
Non-cash items included in net income:
Depreciation and amortization	55,348	51,421
Deferred income tax provision and investment tax credits	5,966	(6,765)
Power and natural gas cost amortizations (deferrals), net	(7,811)	6,380
Amortization of debt expense	823	653
Stock-based compensation expense	626	872
Equity-related AFUDC	(1,754)	(1,599)
Pension and other postretirement benefit expense	7,556	7,952
Other regulatory assets and liabilities and deferred debits and credits	1,762	11,902
Change in decoupling regulatory deferral	(682)	4,155
Gain on sale of investments	(155)	(3,242)
Other	(2,828)	5,112
Contributions to defined benefit pension plan	(14,000)	(7,300)
Changes in certain current assets and liabilities:
Accounts and notes receivable	6,728	6,078
Materials and supplies, fuel stock and stored natural gas	4,291	9,901
Collateral posted for derivative instruments	1,497	(14,283)
Income taxes receivable	5,442	10,500
Income taxes payable	557	4,901
Other current assets	(260)	(2,166)
Accounts payable	(2,590)	(19,527)
Other current liabilities	16,557	21,905
Net cash provided by operating activities	145,090	135,274
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(97,203)	(95,525)
Issuance of notes receivable	(75)	(2,779)
Equity and property investments	(2,340)	(1,313)
Proceeds from sale of investments	801	5,148
Other	2,356	(662)
Net cash used in investing activities	(96,461)	(95,131)
Financing Activities:
Net decrease in short-term borrowings	(10,000)	(800)
Maturity of long-term debt and finance leases	(759)	(700)
Issuance of common stock, net of issuance costs	65	175
Cash dividends paid	(29,399)	(27,389)
Other	(1,085)	(2,406)
Net cash used in financing activities	(41,178)	(31,120)
Net increase in cash and cash equivalents	7,451	9,023
Cash and cash equivalents at beginning of period	14,196	9,896
Cash and cash equivalents at end of period	$ 21,647	$ 18,919

XML

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Beginning Balance (in shares) at Dec. 31, 2019		67,176,996
Shares issued		115,237
Ending Balance (in shares) at Mar. 31, 2020		67,292,233
Beginning Balance at Dec. 31, 2019		$ 1,210,741	$ (10,259)	$ 738,802
Equity compensation expense		804
Issuance of common stock, net of issuance costs		175
Payment of minimum tax withholdings for share-based payment awards		(2,408)
Ending Balance at Mar. 31, 2020	$ 1,959,095	$ 1,209,312	(10,054)	759,837
Other comprehensive income	205		205
Net income	$ 48,424			48,424
Cash dividends paid on common stock				(27,389)
Dividends declared per common share	$ 0.4050
Beginning Balance (in shares) at Dec. 31, 2020	69,238,901	69,238,901
Shares issued		74,436
Ending Balance (in shares) at Mar. 31, 2021	69,313,337	69,313,337
Beginning Balance at Dec. 31, 2020		$ 1,286,068	(14,378)	758,036
Equity compensation expense		859
Issuance of common stock, net of issuance costs		65
Payment of minimum tax withholdings for share-based payment awards		(993)
Ending Balance at Mar. 31, 2021	$ 2,068,590	$ 1,285,999	(14,063)	796,654
Other comprehensive income	315		$ 315
Net income	$ 68,017			68,017
Cash dividends paid on common stock				$ (29,399)
Dividends declared per common share	$ 0.4225

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information.

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Regulation

The Company is subject to state regulation in Washington, Idaho, Montana, Oregon and Alaska. The Company is also subject to federal regulation primarily by the FERC, as well as various other federal agencies with regulatory oversight of particular aspects of its operations.

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. See Note 15 for further discussion of the Company's commitments and contingencies.

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New Accounting Standards

3 Months Ended

Mar. 31, 2021

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

New Accounting Standards

NOTE 2. NEW ACCOUNTING STANDARDS

There are no new accounting standards with a material impact to the Company.

XML

Balance Sheet Components

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

NOTE 3. BALANCE SHEET COMPONENTS

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Materials and supplies	$	56,368	$	53,258
Fuel stock		4,843		4,658
Stored natural gas		1,949		9,535
Total	$	63,160	$	67,451

Other Current Assets

Other current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Collateral posted for derivative instruments after netting with outstanding    derivative liabilities	$	4,810	$	4,336
Prepayments		25,984		24,411
Income taxes receivable		44,371		49,814
Other		7,757		6,324
Total	$	82,922	$	84,885

Net Utility Property

Net utility property consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Utility plant in service	$	6,865,652	$	6,809,797
Construction work in progress		193,685		175,767
Total		7,059,337		6,985,564
Less: Accumulated depreciation and amortization		2,032,234		1,993,952
Total net utility property	$	5,027,103	$	4,991,612

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Operating lease ROU assets	$	71,410	$	71,891
Finance lease ROU assets		46,428		47,338
Non-utility property		18,398		19,508
Equity investments		61,132		59,318
Investment in affiliated trust		11,547		11,547
Notes receivable		14,665		14,454
Deferred compensation assets		9,469		9,174
Assets held for sale (1)		3,363		3,462
Other		27,552		26,947
Total	$	263,964	$	263,639

(1)  The Company is in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub.

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Accrued taxes other than income taxes	$	56,630	$	45,099
Derivative liabilities		8,644		14,008
Employee paid time off accruals		28,775		26,495
Accrued interest		28,920		17,083
Pensions and other postretirement benefits		10,512		11,987
Other		28,151		35,159
Total other current liabilities	$	161,632	$	149,831

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Operating lease liabilities	$	68,276	$	67,716
Finance lease liabilities		48,044		48,815
Deferred investment tax credits		29,728		29,866
Asset retirement obligations		17,126		17,194
Derivative liabilities		8,959		37,427
Other		14,524		13,981
Total	$	186,657	$	214,999

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	3,637	$	3,237	$	2,073	$	5,722
Decoupling surcharge		18,150		6,812		7,123		17,123
Pension and other postretirement benefit plans		—		196,153		—		198,746
Interest rate swaps		—		177,824		—		214,851
Deferred income taxes		—		111,537		—		108,517
Settlement with Coeur d'Alene Tribe		—		39,764		—		40,043
AFUDC above FERC allowed rate		—		48,270		—		47,393
Demand side management programs		—		904		—		3,814
Utility plant to be abandoned		—		27,599		—		28,916
COVID-19 deferrals		—		11,759		—		8,166
Other regulatory assets		7,438		82,062		4,477		77,152
Total regulatory assets	$	29,225	$	705,921	$	13,673	$	750,443
Regulatory Liabilities
Income tax related liabilities	$	15,013	$	395,859	$	14,952	$	399,677
Deferred power costs		18,955		13,859		20,299		17,570
Decoupling rebate		1,396		1,604		1,447		1,519
Utility plant retirement costs		—		330,897		—		325,832
Interest rate swaps		—		17,218		—		15,046
COVID-19 deferrals		—		11,628		—		10,949
Other regulatory liabilities		9,703		12,719		9,737		14,227
Total regulatory liabilities	$	45,067	$	783,784	$	46,435	$	784,820

XML

Revenue

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Revenue

NOTE 4. REVENUE

ASC 606 defines the core principle of the revenue recognition model is that an entity should identify the various performance obligations in a contract, allocate the transaction price among the performance obligations and recognize revenue when (or as) the entity satisfies each performance obligation.

Utility Revenues

Revenue from Contracts with Customers

General

The majority of Avista Corp.’s revenue is from rate-regulated sales of electricity and natural gas to retail customers, which has two performance obligations, (1) having service available for a specified period (typically a month at a time) and (2) the delivery of energy to customers. The total energy price generally has a fixed component (basic charge) related to having service available and a usage-based component, related to the delivery and consumption of energy. The commodity is sold and/or delivered to and consumed by the customer simultaneously, and the provisions of the relevant utility commission authorization determine the charges the Company may bill the customer. Given that all revenue recognition criteria are met upon the delivery of energy to customers, revenue is recognized immediately at that time.

Revenues from contracts with customers are presented in the Condensed Consolidated Statements of Income in the line item "Utility revenues, exclusive of alternative revenue programs."

Non-Derivative Wholesale Contracts

The Company has certain wholesale contracts which are not accounted for as derivatives and, accordingly, are within the scope of ASC 606 and considered revenue from contracts with customers. Revenue is recognized as energy is delivered to the customer or the service is available for a specified period of time, consistent with the discussion of rate-regulated sales above.

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Derivative Revenue

Most wholesale electric and natural gas transactions (including both physical and financial transactions), and the sale of fuel are considered derivatives, which are specifically scoped out of ASC 606. As such, these revenues are disclosed separately from revenue from contracts with customers. Revenue is recognized for these items upon the settlement/expiration of the derivative contract. Derivative revenue includes those transactions that are entered into and settled within the same month.

Other Utility Revenue

Other utility revenue includes rent, sales of materials, late fees and other charges that do not represent contracts with customers. Other utility revenue also includes the provision for earnings sharing and the deferral and amortization of refunds to customers associated with the TCJA. This revenue is scoped out of ASC 606, as this revenue does not represent items where a customer is a party that has contracted with the Company to obtain goods or services that are an output of the Company’s ordinary activities in exchange for consideration. As such, these revenues are presented separately from revenue from contracts with customers.

Other Considerations for Utility Revenues

Gross Versus Net Presentation

Revenues and resource costs from Avista Utilities’ settled energy contracts that are “booked out” (not physically delivered) are reported on a net basis as part of derivative revenues.

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2021		2020
Utility-related taxes	$	19,696	$	18,700

Significant Judgments and Unsatisfied Performance Obligations

The only significant judgments involving revenue recognition are estimates surrounding unbilled revenue and receivables from contracts with customers and estimates surrounding the amount of decoupling revenues that will be collected from customers within 24 months (discussed above).

The Company has certain capacity arrangements, where the Company has a contractual obligation to provide either electric or natural gas capacity to its customers for a fixed fee. Most of these arrangements are paid for in arrears by the customers and do not result in deferred revenue and only result in receivables from the customers. The Company does have one capacity agreement where the customer makes payments throughout the year and, depending on the timing of the customer payments, it can result in an immaterial amount of deferred revenue or a receivable from the customer. As of March 31, 2021, the Company estimates it had unsatisfied capacity performance obligations of $21.2 million, which will be recognized as revenue in future periods as the capacity is provided to the customers. These performance obligations are not reflected in the financial statements, as the Company has not received payment for these services.

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2021			2020
Avista Utilities
Revenue from contracts with customers	$	358,613		$	351,628
Derivative revenues		34,981			31,075
Alternative revenue programs		499			(4,413	)
Deferrals and amortizations for rate refunds to customers		3,189			(2,606	)
Other utility revenues		2,578			1,521
Total Avista Utilities		399,860			377,205
AEL&P
Revenue from contracts with customers		12,779			12,126
Deferrals and amortizations for rate refunds to customers		(47	)		(48	)
Other utility revenues		89			124
Total AEL&P		12,821			12,202
Other revenues		189			823
Total operating revenues	$	412,870		$	390,230

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's electric operations for the three months ended March 31 (dollars in thousands):

	2021						2020
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
Three months ended March 31,
ELECTRIC OPERATIONS
Revenue from contracts with customers
Residential	$	113,223	$	6,048	$	119,271	$	107,977	$	5,866	$	113,843
Commercial and governmental		76,284		4,772		81,056		78,849		6,199		85,048
Industrial		24,711		1,899		26,610		24,711		—		24,711
Public street and highway lighting		1,852		60		1,912		1,783		61		1,844
Total retail revenue		216,070		12,779		228,849		213,320		12,126		225,446
Transmission		3,495		—		3,495		3,774		—		3,774
Other revenue from contracts with    customers		6,140		—		6,140		5,289		—		5,289
Total electric revenue from contracts with customers	$	225,705	$	12,779	$	238,484	$	222,383	$	12,126	$	234,509

The following table disaggregates revenue from contracts with customers associated with the Company's natural gas operations for the three months ended March 31 (dollars in thousands):

	2021		2020
	Avista Utilities		Avista Utilities
Three months ended March 31,
NATURAL GAS OPERATIONS
Revenue from contracts with customers
Residential	$	87,501	$	84,173
Commercial and governmental		39,775		39,401
Industrial and interruptible		2,224		2,194
Total retail revenue		129,500		125,768
Transportation		2,283		2,352
Other revenue from contracts with    customers		1,125		1,125
Total natural gas revenue from    contracts with customers	$	132,908	$	129,245

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Derivatives and Risk Management

3 Months Ended

Mar. 31, 2021

Derivative Instruments And Hedges [Abstract]

Derivatives and Risk Management

NOTE 5. DERIVATIVES AND RISK MANAGEMENT

Energy Commodity Derivatives

Avista Corp. is exposed to market risks relating to changes in electricity and natural gas commodity prices and certain other fuel prices. Market risk is, in general, the risk of fluctuation in the market price of the commodity being traded and is influenced primarily by supply and demand. Market risk includes the fluctuation in the market price of associated derivative commodity instruments. Avista Corp. utilizes derivative instruments, such as forwards, futures, swap derivatives and options, in order to manage the various risks relating to these commodity price exposures. Avista Corp. has an energy resources risk policy and control procedures to manage these risks.

As part of Avista Corp.'s resource procurement and management operations in the electric business, Avista Corp. engages in an ongoing process of resource optimization, which involves the economic selection from available energy resources to serve Avista Corp.'s load obligations and the use of these resources to capture available economic value through wholesale market transactions. These include sales and purchases of electric capacity and energy, fuel for electric generation, and derivative contracts related to capacity, energy and fuel. Such transactions are part of the process of matching resources with load obligations and hedging a portion of the related financial risks. These transactions range from terms of intra-hour up to multiple years.

As part of its resource procurement and management of its natural gas business, Avista Corp. makes continuing projections of its natural gas loads and assesses available natural gas resources including natural gas storage availability. Natural gas resource planning typically includes peak requirements, low and average monthly requirements and delivery constraints from natural gas supply locations to Avista Corp.’s distribution system. However, daily variations in natural gas demand can be significantly different than monthly demand projections. On the basis of these projections, Avista Corp. plans and executes a series of transactions to hedge a portion of its projected natural gas requirements through forward market transactions and derivative instruments. These transactions may extend as much as three natural gas operating years (November through October) into the future. Avista Corp. also leaves a significant portion of its natural gas supply requirements unhedged for purchase in short-term and spot markets.

Avista Corp. plans for sufficient natural gas delivery capacity to serve its retail customers for a theoretical peak day event. Avista Corp. generally has more pipeline and storage capacity than what is needed during periods other than a peak-day. Avista Corp. optimizes its natural gas resources by using market opportunities to generate economic value that mitigates the fixed costs. Avista Corp. also optimizes its natural gas storage capacity by purchasing and storing natural gas when prices are traditionally lower, typically in the summer, and withdrawing during higher priced months, typically during the winter. However, if market conditions and prices indicate that Avista Corp. should buy or sell natural gas at other times during the year, Avista Corp. engages in optimization transactions to capture value in the marketplace. Natural gas optimization activities include, but are not limited to, wholesale market sales of surplus natural gas supplies, purchases and sales of natural gas to optimize use of pipeline and storage capacity, and participation in the transportation capacity release market.

The following table presents the underlying energy commodity derivative volumes as of March 31, 2021 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
Remainder 2021		3		92		7,434		48,028		40		754		8,045		29,520
2022		—		—		450		29,345		—		—		1,360		12,950
2023		—		—		—		6,920		—		—		1,360		1,970
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of March 31, 2021, there are no expected deliveries of energy commodity derivatives after 2025.

The following table presents the underlying energy commodity derivative volumes as of December 31, 2020 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
2021		1		224		10,353		65,188		17		451		5,448		39,273
2022		—		—		450		25,525		—		—		1,360		12,030
2023		—		—		—		4,950		—		—		1,360		900
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of December 31, 2020, there are no expected deliveries of energy commodity derivatives after 2025.

(1) Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

The electric and natural gas derivative contracts above will be included in either power supply costs or natural gas supply costs during the period they are scheduled to be delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA and PGAs), or in the general rate case process, and are expected to be collected through retail rates from customers.

Foreign Currency Exchange Derivatives

A significant portion of Avista Corp.’s natural gas supply (including fuel for power generation) is obtained from Canadian sources. Most of those transactions are executed in U.S. dollars, which avoids foreign currency risk. A portion of Avista Corp.’s short-term natural gas transactions and long-term Canadian transportation contracts are committed based on Canadian currency prices. The short-term natural gas transactions are settled within 60 days with U.S. dollars. Avista Corp. hedges a portion of the foreign currency risk by purchasing Canadian currency exchange derivatives when such commodity transactions are initiated. The foreign currency exchange derivatives and the unhedged foreign currency risk have not had a material effect on Avista Corp.’s financial condition, results of operations or cash flows and these differences in cost related to currency fluctuations are included with natural gas supply costs for ratemaking.

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Number of contracts		25		22
Notional amount (in United States dollars)	$	4,916	$	3,860
Notional amount (in Canadian dollars)		6,178		4,949

Interest Rate Swap Derivatives

Avista Corp. is affected by fluctuating interest rates related to a portion of its existing debt, and future borrowing requirements. Avista Corp. hedges a portion of its interest rate risk with financial derivative instruments, which may include interest rate swap derivatives and U.S. Treasury lock agreements. These interest rate swap derivatives and U.S. Treasury lock agreements are considered economic hedges against fluctuations in future cash flows associated with anticipated debt issuances.

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Balance Sheet Date	Number of Contracts		Notional Amount		Mandatory Cash Settlement Date
March 31, 2021		4		45,000	2021
		12		130,000	2022
		1		10,000	2023
December 31, 2020		4		45,000	2021
		11		120,000	2022
		1		10,000	2023

The fair value of outstanding interest rate swap derivatives can vary significantly from period to period depending on the total notional amount of swap derivatives outstanding and fluctuations in market interest rates compared to the interest rates fixed by the swaps. Avista Corp. is required to make cash payments to settle the interest rate swap derivatives when the fixed rates are higher than prevailing market rates at the date of settlement. Conversely, Avista Corp. receives cash to settle its interest rate swap derivatives when prevailing market rates at the time of settlement exceed the fixed swap rates. 

Summary of Outstanding Derivative Instruments

The amounts recorded on the Condensed Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020 reflect the offsetting of derivative assets and liabilities where a legal right of offset exists.

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2021 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(22	)	$	—	$	(22	)
Interest rate swap derivatives
Other current assets		1,743		—			—		1,743
Other property and investments-net and other non-current assets		4,613		(3,820	)		—		793
Other current liabilities		—		(10,978	)		3,910		(7,068	)
Other non-current liabilities and deferred credits		1,264		(5,525	)		—		(4,261	)
Energy commodity derivatives
Other current assets		749		(24	)		—		725
Other property and investments-net and other non-current assets		2,598		(1,136	)		—		1,462
Other current liabilities		17,458		(21,820	)		2,786		(1,576	)
Other non-current liabilities and deferred credits		95		(4,793	)		—		(4,698	)
Total derivative instruments recorded on the balance sheet	$	28,520	$	(48,118	)	$	6,696	$	(12,902	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2020 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current assets	$	30	$	—		$	—	$	30
Interest rate swap derivatives
Other current liabilities		—		(19,575	)		8,050		(11,525	)
Other non-current liabilities and deferred credits		952		(32,190	)		—		(31,238	)
Energy commodity derivatives
Other current assets		9,203		(8,306	)		—		897
Other property and investments-net and other non-current assets		1,755		(1,159	)		—		596
Other current liabilities		11,037		(14,007	)		487		(2,483	)
Other non-current liabilities and deferred credits		1,725		(8,043	)		129		(6,189	)
Total derivative instruments recorded on the balance sheet	$	24,702	$	(83,280	)	$	8,666	$	(49,912	)

Exposure to Demands for Collateral

Avista Corp.'s derivative contracts often require collateral (in the form of cash or letters of credit) or other credit enhancements, or reductions or terminations of a portion of the contract through cash settlement. In the event of a downgrade in Avista Corp.'s credit ratings or changes in market prices, additional collateral may be required. In periods of price volatility, the level of exposure can change significantly. As a result, sudden and significant demands may be made against Avista Corp.'s credit facilities and cash. Avista Corp. actively monitors the exposure to possible collateral calls and takes steps to mitigate capital requirements.

The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Energy commodity derivatives
Cash collateral posted	$	7,596	$	4,953
Letters of credit outstanding		12,500		23,500
Balance sheet offsetting		2,786		616
Interest rate swap derivatives
Cash collateral posted (offset by net derivative positions)		3,910		8,050

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features		14,956		50,813
Additional collateral to post		11,046		42,763

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Pension Plans and Other Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2021

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Pension Plans and Other Postretirement Benefit Plans

NOTE 6. PENSION PLANS AND OTHER POSTRETIREMENT BENEFIT PLANS

Avista Utilities

Avista Utilities’ maintained the same pension and other postretirement plans during the three months ended March 31, 2021 as those described as of December 31, 2020. The Company’s funding policy is to contribute at least the minimum amounts that are required to be funded under the Employee Retirement Income Security Act, but not more than the maximum amounts that are currently deductible for income tax purposes. The Company contributed $14 million in cash to the pension plan for the three months ended March 31, 2021 and it expects to contribute $42 million in 2021.

The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2021			2020			2021			2020
Service cost	$	6,246		$	5,546		$	1,008		$	979
Interest cost		6,580			6,971			1,376			1,515
Expected return on plan assets		(9,775	)		(9,125	)		(675	)		(630	)
Amortization of prior service cost		75			75			(275	)		(275	)
Net loss recognition		1,823			1,654			1,173			1,243
Net periodic benefit cost	$	4,949		$	5,121		$	2,607		$	2,832

Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.

The non-service portion of costs in the table above are recorded to other expense below income from operations in the Condensed Consolidated Statements of Income or capitalized as a regulatory asset. Approximately 40 percent of the costs are capitalized to regulatory assets and 60 percent is expensed to the income statement.

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 7. INCOME TAXES

In accordance with interim reporting requirements, the Company uses an estimated annual effective tax rate for computing its provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual tax rate is applied to year-to-date pre-tax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period’s year-to-date amount.

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2021					2020
Federal income taxes at statutory rates	$	16,838		21.0	%	$	11,961		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility       plant differences		(3,240	)	(4.0	)		(2,402	)	(4.2	)
State income tax expense		552		0.7			1,227		2.1
Settlement of equity awards		930		1.1			165		0.3
Other		(2,916	)	(3.6	)		(2,419	)	(4.2	)
Total income tax expense	$	12,164		15.2	%	$	8,532		15.0	%

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Committed Lines of Credit

3 Months Ended

Mar. 31, 2021

Short Term Borrowings [Abstract]

Committed Lines of Credit

NOTE 8. COMMITTED LINES OF CREDIT

Avista Corp.

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million with an expiration date of April 2022, with the option to extend for an additional one year period (subject to customary conditions). The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit.

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,			December 31,
	2021			2020
Balance outstanding at end of period	$	93,000		$	102,000
Letters of credit outstanding at end of period	$	16,618		$	27,618
Average interest rate at end of period		1.17	%		1.22	%

As of March 31, 2021 and December 31, 2020, the borrowings outstanding under Avista Corp.'s committed line of credit were classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

AEL&P

AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2024. As of March 31, 2021 and December 31, 2020, there were borrowings of $0 and $1.0 million, respectively, and there were no letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

NOTE 9. CREDIT AGREEMENT

In April 2020, the Company entered into a one-year Credit Agreement with various financial institutions, in the amount of $100 million. The Company borrowed the entire $100.0 million in April 2020 and repaid the outstanding balance in April 2021.

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Credit Agreement

3 Months Ended

Mar. 31, 2021

Credit Agreement [Abstract]

Committed Lines of Credit

NOTE 8. COMMITTED LINES OF CREDIT

Avista Corp.

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million with an expiration date of April 2022, with the option to extend for an additional one year period (subject to customary conditions). The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit.

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,			December 31,
	2021			2020
Balance outstanding at end of period	$	93,000		$	102,000
Letters of credit outstanding at end of period	$	16,618		$	27,618
Average interest rate at end of period		1.17	%		1.22	%

As of March 31, 2021 and December 31, 2020, the borrowings outstanding under Avista Corp.'s committed line of credit were classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

AEL&P

AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2024. As of March 31, 2021 and December 31, 2020, there were borrowings of $0 and $1.0 million, respectively, and there were no letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

NOTE 9. CREDIT AGREEMENT

In April 2020, the Company entered into a one-year Credit Agreement with various financial institutions, in the amount of $100 million. The Company borrowed the entire $100.0 million in April 2020 and repaid the outstanding balance in April 2021.

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Long- Term Debt to Affiliated Trust

3 Months Ended

Mar. 31, 2021

Long Term Debt To Affiliated Trust [Abstract]

Long- Term Debt To Affiliated Trusts

NOTE 10. LONG-TERM DEBT TO AFFILIATED TRUSTS

In 1997, the Company issued Floating Rate Junior Subordinated Deferrable Interest Debentures, Series B, with a principal amount of $51.5 million to Avista Capital II, an affiliated business trust formed by the Company. Avista Capital II issued $50.0 million of Preferred Trust Securities with a floating distribution rate of LIBOR plus 0.875 percent, calculated and reset quarterly.

The distribution rates paid were as follows during the three months ended March 31, 2021 and the year ended December 31, 2020:

	March 31,			December 31,
	2021			2020
Low distribution rate		1.07	%		1.10	%
High distribution rate		1.10	%		2.79	%
Distribution rate at the end of the period		1.07	%		1.10	%

Concurrent with the issuance of the Preferred Trust Securities, Avista Capital II issued $1.5 million of Common Trust Securities to the Company. The Preferred Trust Securities may be redeemed at the option of Avista Capital II at any time and mature on June 1, 2037. In December 2000, the Company purchased $10.0 million of these Preferred Trust Securities.

The Company owns 100 percent of Avista Capital II and has solely and unconditionally guaranteed the payment of distributions on, and redemption price and liquidation amount for, the Preferred Trust Securities to the extent that Avista Capital II has funds available for such payments from the respective debt securities. Upon maturity or prior redemption of such debt securities, the Preferred Trust Securities will be mandatorily redeemed. The Company does not include these capital trusts in its consolidated financial statements as Avista Corp. is not the primary beneficiary. As such, the sole assets of the capital trusts are $51.5 million of junior subordinated deferrable interest debentures of Avista Corp., which are reflected on the Condensed Consolidated Balance Sheets. Interest expense to affiliated trusts in the Condensed Consolidated Statements of Income represents interest expense on these debentures.

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Fair Value

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value

NOTE 11. FAIR VALUE

The carrying values of cash and cash equivalents, accounts and notes receivable, accounts payable, and short-term borrowings are reasonable estimates of their fair values. Long-term debt (including current portion and material capital leases) and long-term debt to affiliated trusts are reported at carrying value on the Condensed Consolidated Balance Sheets.

The fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to fair values derived from unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. Active markets are those in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, but which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

Level 3 – Pricing inputs include significant inputs that are generally unobservable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.

Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The determination of the fair values incorporates various factors that not only include the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit), but also the impact of Avista Corp.’s nonperformance risk on its liabilities.

The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	963,500	$	1,129,375	$	963,500	$	1,189,824
Long-term debt (Level 3)		1,060,000		1,081,300		1,060,000		1,235,248
Snettisham finance lease obligation (Level 3)		51,016		51,000		51,750		58,700
Long-term debt to affiliated trusts (Level 3)		51,547		43,815		51,547		43,815

These estimates of fair value of long-term debt and long-term debt to affiliated trusts were primarily based on available market information, which generally consists of estimated market prices from third party brokers for debt with similar risk and terms. The price ranges obtained from the third party brokers consisted of par values of 85.00 to 136.39, where a par value of 100.0 represents the carrying value recorded on the Condensed Consolidated Balance Sheets. Level 2 long-term debt represents publicly issued bonds with quoted market prices; however, due to their limited trading activity, they are classified as Level 2 because brokers must generate quotes and make estimates if there is no trading activity near a period end. Level 3 long-term debt consists of private placement bonds and debt to affiliated trusts, which typically have no secondary trading activity. Fair values in Level 3 are estimated based on market prices from third party brokers using secondary market quotes for debt with similar risk and terms to generate quotes for Avista Corp. bonds. Due to the unique nature of the Snettisham finance lease obligation, the estimated fair value of these items was determined based on a discounted cash flow model using available market information. The Snettisham finance lease obligation was discounted to present value using the Morgan Markets A Ex-Fin discount rate as published on March 31, 2021 and December 31, 2020.

The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 at fair value on a recurring basis (dollars in thousands):

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2021
Assets:
Energy commodity derivatives	$	—	$	20,805	$	—	$	(18,618	)	$	2,187
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		95		(95	)		—
Interest rate swap derivatives		—		7,620		—		(5,084	)		2,536
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,154		—		—		—			2,154
Equity securities (2)		7,115		—		—		—			7,115
Total	$	9,269	$	28,425	$	95	$	(23,797	)	$	13,992
Liabilities:
Energy commodity derivatives	$	—	$	21,477	$	—	$	(21,404	)	$	73
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		6,296		(95	)		6,201
Foreign currency exchange derivatives		—		22		—		—			22
Interest rate swap derivatives		—		20,323		—		(8,994	)		11,329
Total	$	—	$	41,822	$	6,296	$	(30,493	)	$	17,625
December 31, 2020
Assets:
Energy commodity derivatives	$	—	$	23,645	$	—	$	(22,152	)	$	1,493
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		75		(75	)		—
Foreign currency exchange derivatives		—		30		—		—			30
Interest rate swap derivatives		—		952		—		(952	)		—
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,471		—		—		—			2,471
Equity securities (2)		6,228		—		—		—			6,228
Total	$	8,699	$	24,627	$	75	$	(23,179	)	$	10,222
Liabilities:
Energy commodity derivatives	$	—	$	23,030	$	—	$	(22,768	)	$	262
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		8,485		(75	)		8,410
Interest rate swap derivatives		—		51,765		—		(9,002	)		42,763
Total	$	—	$	74,795	$	8,485	$	(31,845	)	$	51,435

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

The difference between the amount of derivative assets and liabilities disclosed in respective levels in the table above and the amount of derivative assets and liabilities disclosed on the Condensed Consolidated Balance Sheets is due to netting arrangements with certain counterparties. See Note 5 for additional discussion of derivative netting.

To establish fair value for energy commodity derivatives, the Company uses quoted market prices and forward price curves to estimate the fair value of energy commodity derivative instruments included in Level 2. In particular, electric derivative valuations are performed using market quotes, adjusted for periods in between quotable periods. Natural gas derivative valuations are estimated using New York Mercantile Exchange pricing for similar instruments, adjusted for basin differences, using market quotes. Where observable inputs are available for substantially the full term of the contract, the derivative asset or liability is included in Level 2.

To establish fair values for interest rate swap derivatives, the Company uses forward market curves for interest rates for the term of the swaps and discounts the cash flows back to present value using an appropriate discount rate. The discount rate is calculated by third party brokers according to the terms of the swap derivatives and evaluated by the Company for reasonableness, with consideration given to the potential non-performance risk by the Company. Future cash flows of the interest rate swap derivatives are equal to the fixed interest rate in the swap compared to the floating market interest rate multiplied by the notional amount for each period.

To establish fair value for foreign currency derivatives, the Company uses forward market curves for Canadian dollars against the US dollar and multiplies the difference between the locked-in price and the market price by the notional amount of the derivative. Forward foreign currency market curves are provided by third party brokers. The Company's credit spread is factored into the locked-in price of the foreign exchange contracts.

Deferred compensation assets and liabilities represent funds held by the Company in a Rabbi Trust for an executive deferral plan. These funds consist of actively traded equity and bond funds with quoted prices in active markets. The balance disclosed in the table above excludes cash and cash equivalents of $0.2 million and $0.5 million as of March 31, 2021 and December 31, 2020, respectively.

Level 3 Fair Value

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2021 (dollars in thousands):

	Fair Value (Net) at			Valuation	Unobservable	Range and Weighted
	March 31, 2021			Technique	Input	Average Price
Natural gas exchange agreement	$	(6,201	)	Internally derived weighted average cost of gas	Forward purchase	$1.84 - $2.85/mmBTU $2.21 Weighted Average
					Forward sales prices	$1.90 - $4.25/mmBTU $3.53 Weighted Average
					Purchase volumes	130,000 - 310,000 mmBTUs
					Sales volumes	75,000 - 310,000 mmBTUs

The following table presents activity for energy commodity derivative assets (liabilities) measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31 (dollars in thousands):

	Natural Gas Exchange Agreement
Three months ended March 31, 2021:
Balance as of January 1, 2021	$	(8,410	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		3,220
Settlements		(1,011	)
Ending balance as of March 31, 2021 (2)	$	(6,201	)
Three months ended March 31, 2020:
Balance as of January 1, 2020	$	(2,976	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		485
Settlements		238
Ending balance as of March 31, 2020 (2)	$	(2,253	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

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Common Stock

3 Months Ended

Mar. 31, 2021

Stockholders Equity Note [Abstract]

Common Stock

NOTE 12. COMMON STOCK

The Company has authority to issue a maximum of approximately 3.2 million shares under its sales agency agreements, of which approximately 1.3 million shares remain unissued as of March 31, 2021. The Company has board authority, and has requested regulatory authority, to issue 3.0 million shares in addition to the 1.3 million shares previously authorized but remaining unissued. During the three months ended March 31, 2021 and March 31, 2020, the Company did not issue shares under the sales agency agreements.

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Loss [Abstract]

Accumulated Other Comprehensive Loss

NOTE 13. ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Unfunded benefit obligation for pensions and other postretirement benefit plans -    net of taxes of $3,738 and $3,822, respectively	$	14,063	$	14,378

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands):

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income)	2021			2020
Amortization of defined benefit pension items
Amortization of net prior service cost (a)	$	(200	)	$	(200	)
Amortization of net loss (a)		3,191			3,100
Adjustment due to effects of regulation (a)		(2,592	)		(2,641	)
Total before tax (b)		399			259
Tax expense (b)		(84	)		(54	)
Net of tax (b)	$	315		$	205

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details).

(b) Description is also the affected line item on the Condensed Consolidated Statement of Income.

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Common Share

NOTE 14. EARNINGS PER COMMON SHARE

The following table presents the computation of basic and diluted earnings per common share for the three months ended March 31 (in thousands, except per share amounts):

	2021		2020
Numerator:
Net income	$	68,017	$	48,424
Denominator:
Weighted-average number of common shares outstanding-basic		69,293		67,239
Effect of dilutive securities:
Performance and restricted stock awards		213		142
Weighted-average number of common shares outstanding-diluted		69,506		67,381
Earnings per common share:
Basic	$	0.98	$	0.72
Diluted	$	0.98	$	0.72

There were no shares excluded from the calculation because they were antidilutive.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 15. COMMITMENTS AND CONTINGENCIES

In the course of its business, the Company becomes involved in various claims, controversies, disputes and other contingent matters, including the items described in this Note. Some of these claims, controversies, disputes and other contingent matters involve litigation or other contested proceedings. For all such matters, the Company intends to vigorously protect and defend its interests and pursue its rights. However, no assurance can be given as to the ultimate outcome of any particular matter because litigation and other contested proceedings are inherently subject to numerous uncertainties. For matters that affect Avista Utilities’ or AEL&P's operations, the Company intends to seek, to the extent appropriate, recovery of incurred costs through the ratemaking process.

Boyds Fire (State of Washington Department of Natural Resources v. Avista)

In August 2019, the Company was served with a complaint, captioned “State of Washington Department of Natural Resources v. Avista Corporation,” seeking recovery up to $4.4 million for fire suppression and investigation costs and related expenses incurred in connection with a wildfire that occurred in Ferry County, Washington in August 2018. Specifically, the complaint alleges that the fire, which became known as the “Boyds Fire,” was caused by a dead ponderosa pine tree falling into an overhead distribution line, and that Avista Corp. was negligent in failing to identify and remove the tree before it came into contact with the line. Avista Corp.

disputes that the tree in question was the cause of the fire and that it was negligent in failing to identify and remove it. Additional lawsuits have subsequently been filed by private landowners seeking property damages, and holders of insurance subrogation claims seeking recovery of insurance proceeds paid.

The lawsuits were filed in the Superior Court of Ferry County, Washington and subsequently consolidated into a single action. The Company intends to vigorously defend itself in the litigation. However, the Company cannot predict the outcome of these matters. 

Labor Day Windstorm

In September 2020, a severe windstorm occurred in eastern Washington and northern Idaho. The extreme weather event resulted in customer outages and the cause of multiple wildfires in the region. With respect to wildfires, the Company’s investigation determined that the primary cause of the fires was extreme high winds. To date, the Company has not found any evidence that the fires were caused by any deficiencies in its equipment, maintenance activities or vegetation management practices.

The Company has become aware of instances where, during the course of the storm, otherwise healthy trees and limbs, located in areas outside its maintenance right-of-way, broke under the extraordinary wind conditions and caused damage to its energy delivery system at or near what is believed to be the potential area of origin of a wildfire. Those instances include what has been referred to as: the Babb Road fire (near Malden and Pine City, Washington); the Christensen Road fire (near Airway Heights, Washington); and the Mile Marker 49 fire (near Orofino, Idaho). These wildfires covered, in total, approximately 22,000 acres. The Company currently estimates approximately 230 residential, commercial and other structures were impacted. Parallel investigations by applicable state agencies, including the Washington Department of Natural Resources, are ongoing, and the Company is cooperating with those efforts.

The Company’s investigation has found no evidence of negligence with respect to any of the fires, and the Company intends to vigorously defend any claims for damages that may be asserted against it with respect to the wildfires arising out of the extreme wind event.

Colstrip

The Washington CETA imposes deadlines by which coal-fired resources, such as Colstrip, must be excluded from the rate base of Washington utilities and by which electricity from such resources may no longer be delivered to Washington retail customers. Not all of the co-owners of Colstrip Units 3 & 4 are Washington utilities subject to CETA, and the co-owners have differing needs for the generating capacity of these units. Accordingly, business disagreements have arisen among the co-owners, including, but not limited to, disagreements as to the shut-down date or dates of these units. These business disagreements, in turn, have led to disagreements as to the interpretation of the Ownership and Operating Agreement, including, but not limited to, the rights of the co-owners to discontinue operations of, or otherwise terminate their interest in, Unit 3 and/or Unit 4. In order to address and resolve these disagreements, the owners have commenced an arbitration proceeding as provided for in the Ownership and Operating Agreement.

In the course of the 2021 legislative session, the Montana Legislature passed two bills specifically directed at the ownership and operation of Colstrip. The first, Montana Senate Bill 265, purports to amend Section 27-5-323 of the Montana Code to provide that an agreement designating venue or disputes involving an electric generation facility located in Montana is not valid unless it requires arbitration in Montana before a panel of three arbitrators. The Ownership and Operating Agreement for Colstrip Units 3 & 4 includes an arbitration provision, through which all owners agreed to resolve disputes regarding the Agreement through arbitration in Spokane County, Washington before a single arbitrator. The Company, together with Puget Sound Energy, Portland General Electric, and PacifiCorp (Pacific Northwest Colstrip owners), has commenced an action in Spokane County Superior Court to compel arbitration of the pending disputes regarding interpretation of the Ownership & Operating Agreement in accordance with the requirements of the parties’ Agreement. The Pacific Northwest Colstrip owners have also commenced action in the U.S. District Court for the District of Montana to challenge the legality and constitutionality of the legislation.  

The Montana Legislature has also passed Montana Senate Bill 266, which would make it an unfair or deceptive act or practice, within the meaning of Montana’s Consumer Protection Act, for one or more owners of a jointly owned electrical generation facility to fail to fund its share of operating costs associated with that facility, or to engage in any conduct that would bring about a permanent closure

of one or more generating units of such a facility without first obtaining the consent of all co-owners of that facility. The Company intends to challenge the legality and constitutionality of this bill as well.

The Company is not able to predict the outcome, nor an amount or range of potential impact in the event of an outcome that is adverse to the Company’s interests.

Other Contingencies

In the normal course of business, the Company has various other legal claims and contingent matters outstanding. The Company believes that any ultimate liability arising from these actions will not have a material impact on its financial condition, results of operations or cash flows. It is possible that a change could occur in the Company’s estimates of the probability or amount of a liability being incurred. Such a change, should it occur, could be significant. See "Note 22 of the Notes to Consolidated Financial Statements" in the 2020 Form 10-K for additional discussion regarding other contingencies.

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Information by Business Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Information by Business Segments

NOTE 16. INFORMATION BY BUSINESS SEGMENTS

The business segment presentation reflects the basis used by the Company's management to analyze performance and determine the allocation of resources. The Company's management evaluates performance based on income (loss) from operations before income taxes as well as net income (loss). The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Avista Utilities' business is managed based on the total regulated utility operation; therefore, it is considered one segment. AEL&P is a separate reportable business segment, as it has separate financial reports that are reviewed in detail by the Chief Operating Decision Maker and its operations and risks are sufficiently different from Avista Utilities and the other businesses at AERC that it cannot be aggregated with any other operating segments. The Other category, which is not a reportable segment, includes other investments and operations of various subsidiaries, as well as certain other operations of Avista Capital.

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2021:
Operating revenues	$	399,860	$	12,821		$	412,681	$	189		$	—		$	412,870
Resource costs		133,840		739			134,579		—			—			134,579
Other operating expenses		84,599		2,956			87,555		1,184			—			88,739
Depreciation and amortization		52,724		2,497			55,221		127			—			55,348
Income (loss) from operations		96,693		6,324			103,017		(1,122	)		—			101,895
Interest expense (2)		24,800		1,525			26,325		129			(41	)		26,413
Income taxes		10,718		1,333			12,051		113			—			12,164
Net income		64,058		3,476			67,534		483			—			68,017
Capital expenditures (3)		96,394		809			97,203		28			—			97,231
For the three months ended March 31, 2020:
Operating revenues	$	377,205	$	12,202		$	389,407	$	823		$	—		$	390,230
Resource costs		129,557		(10	)		129,547		—			—			129,547
Other operating expenses		91,279		3,217			94,496		1,360			—			95,856
Depreciation and amortization		48,974		2,447			51,421		235			—			51,656
Income (loss) from operations		76,534		6,246			82,780		(587	)		—			82,193
Interest expense (2)		24,983		1,589			26,572		131			(86	)		26,617
Income taxes		7,404		1,301			8,705		(173	)		—			8,532
Net income (loss)		45,979		3,395			49,374		(950	)		—			48,424
Capital expenditures (3)		94,056		1,470			95,526		109			—			95,635
Total Assets:
As of March 31, 2021:	$	6,031,502	$	270,554		$	6,302,056	$	110,117		$	(12,677	)	$	6,399,496
As of December 31, 2020:	$	6,035,340	$	268,971		$	6,304,311	$	109,658		$	(11,872	)	$	6,402,097

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Including interest expense to affiliated trusts.

(3) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Nature of Business

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information.

Basis of Reporting

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Regulation

Regulation

The Company is subject to state regulation in Washington, Idaho, Montana, Oregon and Alaska. The Company is also subject to federal regulation primarily by the FERC, as well as various other federal agencies with regulatory oversight of particular aspects of its operations.

Derivative Assets and Liabilities

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. See Note 15 for further discussion of the Company's commitments and contingencies.

Inventory

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Materials and supplies	$	56,368	$	53,258
Fuel stock		4,843		4,658
Stored natural gas		1,949		9,535
Total	$	63,160	$	67,451

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Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Materials and supplies	$	56,368	$	53,258
Fuel stock		4,843		4,658
Stored natural gas		1,949		9,535
Total	$	63,160	$	67,451

Schedule of Other Current Assets

Other current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Collateral posted for derivative instruments after netting with outstanding    derivative liabilities	$	4,810	$	4,336
Prepayments		25,984		24,411
Income taxes receivable		44,371		49,814
Other		7,757		6,324
Total	$	82,922	$	84,885

Schedule of Net Utility Property

Net utility property consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Utility plant in service	$	6,865,652	$	6,809,797
Construction work in progress		193,685		175,767
Total		7,059,337		6,985,564
Less: Accumulated depreciation and amortization		2,032,234		1,993,952
Total net utility property	$	5,027,103	$	4,991,612

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,		December 31,
	2021		2020
Operating lease ROU assets	$	71,410	$	71,891
Finance lease ROU assets		46,428		47,338
Non-utility property		18,398		19,508
Equity investments		61,132		59,318
Investment in affiliated trust		11,547		11,547
Notes receivable		14,665		14,454
Deferred compensation assets		9,469		9,174
Assets held for sale (1)		3,363		3,462
Other		27,552		26,947
Total	$	263,964	$	263,639

(1)  The Company is in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub.

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Accrued taxes other than income taxes	$	56,630	$	45,099
Derivative liabilities		8,644		14,008
Employee paid time off accruals		28,775		26,495
Accrued interest		28,920		17,083
Pensions and other postretirement benefits		10,512		11,987
Other		28,151		35,159
Total other current liabilities	$	161,632	$	149,831

Schedule of Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Operating lease liabilities	$	68,276	$	67,716
Finance lease liabilities		48,044		48,815
Deferred investment tax credits		29,728		29,866
Asset retirement obligations		17,126		17,194
Derivative liabilities		8,959		37,427
Other		14,524		13,981
Total	$	186,657	$	214,999

Schedule of Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	3,637	$	3,237	$	2,073	$	5,722
Decoupling surcharge		18,150		6,812		7,123		17,123
Pension and other postretirement benefit plans		—		196,153		—		198,746
Interest rate swaps		—		177,824		—		214,851
Deferred income taxes		—		111,537		—		108,517
Settlement with Coeur d'Alene Tribe		—		39,764		—		40,043
AFUDC above FERC allowed rate		—		48,270		—		47,393
Demand side management programs		—		904		—		3,814
Utility plant to be abandoned		—		27,599		—		28,916
COVID-19 deferrals		—		11,759		—		8,166
Other regulatory assets		7,438		82,062		4,477		77,152
Total regulatory assets	$	29,225	$	705,921	$	13,673	$	750,443
Regulatory Liabilities
Income tax related liabilities	$	15,013	$	395,859	$	14,952	$	399,677
Deferred power costs		18,955		13,859		20,299		17,570
Decoupling rebate		1,396		1,604		1,447		1,519
Utility plant retirement costs		—		330,897		—		325,832
Interest rate swaps		—		17,218		—		15,046
COVID-19 deferrals		—		11,628		—		10,949
Other regulatory liabilities		9,703		12,719		9,737		14,227
Total regulatory liabilities	$	45,067	$	783,784	$	46,435	$	784,820

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Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Schedule of Utilities Operating Revenue Expense Taxes

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2021		2020
Utility-related taxes	$	19,696	$	18,700

Disaggregation of Revenue

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2021			2020
Avista Utilities
Revenue from contracts with customers	$	358,613		$	351,628
Derivative revenues		34,981			31,075
Alternative revenue programs		499			(4,413	)
Deferrals and amortizations for rate refunds to customers		3,189			(2,606	)
Other utility revenues		2,578			1,521
Total Avista Utilities		399,860			377,205
AEL&P
Revenue from contracts with customers		12,779			12,126
Deferrals and amortizations for rate refunds to customers		(47	)		(48	)
Other utility revenues		89			124
Total AEL&P		12,821			12,202
Other revenues		189			823
Total operating revenues	$	412,870		$	390,230

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's electric operations for the three months ended March 31 (dollars in thousands):

	2021						2020
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
Three months ended March 31,
ELECTRIC OPERATIONS
Revenue from contracts with customers
Residential	$	113,223	$	6,048	$	119,271	$	107,977	$	5,866	$	113,843
Commercial and governmental		76,284		4,772		81,056		78,849		6,199		85,048
Industrial		24,711		1,899		26,610		24,711		—		24,711
Public street and highway lighting		1,852		60		1,912		1,783		61		1,844
Total retail revenue		216,070		12,779		228,849		213,320		12,126		225,446
Transmission		3,495		—		3,495		3,774		—		3,774
Other revenue from contracts with    customers		6,140		—		6,140		5,289		—		5,289
Total electric revenue from contracts with customers	$	225,705	$	12,779	$	238,484	$	222,383	$	12,126	$	234,509

The following table disaggregates revenue from contracts with customers associated with the Company's natural gas operations for the three months ended March 31 (dollars in thousands):

	2021		2020
	Avista Utilities		Avista Utilities
Three months ended March 31,
NATURAL GAS OPERATIONS
Revenue from contracts with customers
Residential	$	87,501	$	84,173
Commercial and governmental		39,775		39,401
Industrial and interruptible		2,224		2,194
Total retail revenue		129,500		125,768
Transportation		2,283		2,352
Other revenue from contracts with    customers		1,125		1,125
Total natural gas revenue from    contracts with customers	$	132,908	$	129,245

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Derivatives and Risk Management (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments And Hedges [Abstract]

Schedule of Energy Commodity Derivative Volumes

The following table presents the underlying energy commodity derivative volumes as of March 31, 2021 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
Remainder 2021		3		92		7,434		48,028		40		754		8,045		29,520
2022		—		—		450		29,345		—		—		1,360		12,950
2023		—		—		—		6,920		—		—		1,360		1,970
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of March 31, 2021, there are no expected deliveries of energy commodity derivatives after 2025.

The following table presents the underlying energy commodity derivative volumes as of December 31, 2020 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
2021		1		224		10,353		65,188		17		451		5,448		39,273
2022		—		—		450		25,525		—		—		1,360		12,030
2023		—		—		—		4,950		—		—		1,360		900
2024		—		—		—		—		—		—		1,370		—
2025		—		—		—		—		—		—		1,115		—

As of December 31, 2020, there are no expected deliveries of energy commodity derivatives after 2025.

(1) Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

Summary of Foreign Currency Exchange Derivatives

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Number of contracts		25		22
Notional amount (in United States dollars)	$	4,916	$	3,860
Notional amount (in Canadian dollars)		6,178		4,949

Summary of Unsettled Interest Rate Swap Derivatives

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Balance Sheet Date	Number of Contracts		Notional Amount		Mandatory Cash Settlement Date
March 31, 2021		4		45,000	2021
		12		130,000	2022
		1		10,000	2023
December 31, 2020		4		45,000	2021
		11		120,000	2022
		1		10,000	2023

Schedules of Fair Values and Locations of Derivative Instruments

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2021 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(22	)	$	—	$	(22	)
Interest rate swap derivatives
Other current assets		1,743		—			—		1,743
Other property and investments-net and other non-current assets		4,613		(3,820	)		—		793
Other current liabilities		—		(10,978	)		3,910		(7,068	)
Other non-current liabilities and deferred credits		1,264		(5,525	)		—		(4,261	)
Energy commodity derivatives
Other current assets		749		(24	)		—		725
Other property and investments-net and other non-current assets		2,598		(1,136	)		—		1,462
Other current liabilities		17,458		(21,820	)		2,786		(1,576	)
Other non-current liabilities and deferred credits		95		(4,793	)		—		(4,698	)
Total derivative instruments recorded on the balance sheet	$	28,520	$	(48,118	)	$	6,696	$	(12,902	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2020 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current assets	$	30	$	—		$	—	$	30
Interest rate swap derivatives
Other current liabilities		—		(19,575	)		8,050		(11,525	)
Other non-current liabilities and deferred credits		952		(32,190	)		—		(31,238	)
Energy commodity derivatives
Other current assets		9,203		(8,306	)		—		897
Other property and investments-net and other non-current assets		1,755		(1,159	)		—		596
Other current liabilities		11,037		(14,007	)		487		(2,483	)
Other non-current liabilities and deferred credits		1,725		(8,043	)		129		(6,189	)
Total derivative instruments recorded on the balance sheet	$	24,702	$	(83,280	)	$	8,666	$	(49,912	)

Schedule of Collateral Outstanding Related to Derivative Instruments

The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Energy commodity derivatives
Cash collateral posted	$	7,596	$	4,953
Letters of credit outstanding		12,500		23,500
Balance sheet offsetting		2,786		616
Interest rate swap derivatives
Cash collateral posted (offset by net derivative positions)		3,910		8,050

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31,		December 31,
	2021		2020
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features		14,956		50,813
Additional collateral to post		11,046		42,763

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Pension Plans and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2021			2020			2021			2020
Service cost	$	6,246		$	5,546		$	1,008		$	979
Interest cost		6,580			6,971			1,376			1,515
Expected return on plan assets		(9,775	)		(9,125	)		(675	)		(630	)
Amortization of prior service cost		75			75			(275	)		(275	)
Net loss recognition		1,823			1,654			1,173			1,243
Net periodic benefit cost	$	4,949		$	5,121		$	2,607		$	2,832

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2021					2020
Federal income taxes at statutory rates	$	16,838		21.0	%	$	11,961		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility       plant differences		(3,240	)	(4.0	)		(2,402	)	(4.2	)
State income tax expense		552		0.7			1,227		2.1
Settlement of equity awards		930		1.1			165		0.3
Other		(2,916	)	(3.6	)		(2,419	)	(4.2	)
Total income tax expense	$	12,164		15.2	%	$	8,532		15.0	%

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Committed Lines of Credit (Tables)

3 Months Ended

Mar. 31, 2021

Short Term Borrowings [Abstract]

Schedule of Balances Outstanding and Interest Rates of Borrowings (Excluding Letters of Credit)

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31,			December 31,
	2021			2020
Balance outstanding at end of period	$	93,000		$	102,000
Letters of credit outstanding at end of period	$	16,618		$	27,618
Average interest rate at end of period		1.17	%		1.22	%

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Long- Term Debt to Affiliated Trust (Tables)

3 Months Ended

Mar. 31, 2021

Long Term Debt To Affiliated Trust [Abstract]

Schedule Of Distribution Rates Paid

The distribution rates paid were as follows during the three months ended March 31, 2021 and the year ended December 31, 2020:

	March 31,			December 31,
	2021			2020
Low distribution rate		1.07	%		1.10	%
High distribution rate		1.10	%		2.79	%
Distribution rate at the end of the period		1.07	%		1.10	%

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Carrying Value and Estimated Fair Value of Financial Instruments

The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	963,500	$	1,129,375	$	963,500	$	1,189,824
Long-term debt (Level 3)		1,060,000		1,081,300		1,060,000		1,235,248
Snettisham finance lease obligation (Level 3)		51,016		51,000		51,750		58,700
Long-term debt to affiliated trusts (Level 3)		51,547		43,815		51,547		43,815

Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis

The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 at fair value on a recurring basis (dollars in thousands):

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2021
Assets:
Energy commodity derivatives	$	—	$	20,805	$	—	$	(18,618	)	$	2,187
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		95		(95	)		—
Interest rate swap derivatives		—		7,620		—		(5,084	)		2,536
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,154		—		—		—			2,154
Equity securities (2)		7,115		—		—		—			7,115
Total	$	9,269	$	28,425	$	95	$	(23,797	)	$	13,992
Liabilities:
Energy commodity derivatives	$	—	$	21,477	$	—	$	(21,404	)	$	73
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		6,296		(95	)		6,201
Foreign currency exchange derivatives		—		22		—		—			22
Interest rate swap derivatives		—		20,323		—		(8,994	)		11,329
Total	$	—	$	41,822	$	6,296	$	(30,493	)	$	17,625
December 31, 2020
Assets:
Energy commodity derivatives	$	—	$	23,645	$	—	$	(22,152	)	$	1,493
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		75		(75	)		—
Foreign currency exchange derivatives		—		30		—		—			30
Interest rate swap derivatives		—		952		—		(952	)		—
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)		2,471		—		—		—			2,471
Equity securities (2)		6,228		—		—		—			6,228
Total	$	8,699	$	24,627	$	75	$	(23,179	)	$	10,222
Liabilities:
Energy commodity derivatives	$	—	$	23,030	$	—	$	(22,768	)	$	262
Level 3 energy commodity derivatives:
Natural gas exchange agreement		—		—		8,485		(75	)		8,410
Interest rate swap derivatives		—		51,765		—		(9,002	)		42,763
Total	$	—	$	74,795	$	8,485	$	(31,845	)	$	51,435

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

Schedule of Quantitative Information

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2021 (dollars in thousands):

	Fair Value (Net) at			Valuation	Unobservable	Range and Weighted
	March 31, 2021			Technique	Input	Average Price
Natural gas exchange agreement	$	(6,201	)	Internally derived weighted average cost of gas	Forward purchase	$1.84 - $2.85/mmBTU $2.21 Weighted Average
					Forward sales prices	$1.90 - $4.25/mmBTU $3.53 Weighted Average
					Purchase volumes	130,000 - 310,000 mmBTUs
					Sales volumes	75,000 - 310,000 mmBTUs

Schedule of Activity For Energy Commodity Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3)

The following table presents activity for energy commodity derivative assets (liabilities) measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31 (dollars in thousands):

	Natural Gas Exchange Agreement
Three months ended March 31, 2021:
Balance as of January 1, 2021	$	(8,410	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		3,220
Settlements		(1,011	)
Ending balance as of March 31, 2021 (2)	$	(6,201	)
Three months ended March 31, 2020:
Balance as of January 1, 2020	$	(2,976	)
Total gains (realized/unrealized):
Included in regulatory assets/liabilities (1)		485
Settlements		238
Ending balance as of March 31, 2020 (2)	$	(2,253	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Loss [Abstract]

Schedule of Accumulated Other Comprehensive Loss, Net of Tax

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):

	March 31, 2021		December 31, 2020
Unfunded benefit obligation for pensions and other postretirement benefit plans -    net of taxes of $3,738 and $3,822, respectively	$	14,063	$	14,378

Reclassification out of Accumulated Other Comprehensive Income

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands):

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income)	2021			2020
Amortization of defined benefit pension items
Amortization of net prior service cost (a)	$	(200	)	$	(200	)
Amortization of net loss (a)		3,191			3,100
Adjustment due to effects of regulation (a)		(2,592	)		(2,641	)
Total before tax (b)		399			259
Tax expense (b)		(84	)		(54	)
Net of tax (b)	$	315		$	205

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details).

(b) Description is also the affected line item on the Condensed Consolidated Statement of Income.

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Earnings Per Common (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Common Share

The following table presents the computation of basic and diluted earnings per common share for the three months ended March 31 (in thousands, except per share amounts):

	2021		2020
Numerator:
Net income	$	68,017	$	48,424
Denominator:
Weighted-average number of common shares outstanding-basic		69,293		67,239
Effect of dilutive securities:
Performance and restricted stock awards		213		142
Weighted-average number of common shares outstanding-diluted		69,506		67,381
Earnings per common share:
Basic	$	0.98	$	0.72
Diluted	$	0.98	$	0.72

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Information by Business Segments (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Business Segments

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2021:
Operating revenues	$	399,860	$	12,821		$	412,681	$	189		$	—		$	412,870
Resource costs		133,840		739			134,579		—			—			134,579
Other operating expenses		84,599		2,956			87,555		1,184			—			88,739
Depreciation and amortization		52,724		2,497			55,221		127			—			55,348
Income (loss) from operations		96,693		6,324			103,017		(1,122	)		—			101,895
Interest expense (2)		24,800		1,525			26,325		129			(41	)		26,413
Income taxes		10,718		1,333			12,051		113			—			12,164
Net income		64,058		3,476			67,534		483			—			68,017
Capital expenditures (3)		96,394		809			97,203		28			—			97,231
For the three months ended March 31, 2020:
Operating revenues	$	377,205	$	12,202		$	389,407	$	823		$	—		$	390,230
Resource costs		129,557		(10	)		129,547		—			—			129,547
Other operating expenses		91,279		3,217			94,496		1,360			—			95,856
Depreciation and amortization		48,974		2,447			51,421		235			—			51,656
Income (loss) from operations		76,534		6,246			82,780		(587	)		—			82,193
Interest expense (2)		24,983		1,589			26,572		131			(86	)		26,617
Income taxes		7,404		1,301			8,705		(173	)		—			8,532
Net income (loss)		45,979		3,395			49,374		(950	)		—			48,424
Capital expenditures (3)		94,056		1,470			95,526		109			—			95,635
Total Assets:
As of March 31, 2021:	$	6,031,502	$	270,554		$	6,302,056	$	110,117		$	(12,677	)	$	6,399,496
As of December 31, 2020:	$	6,035,340	$	268,971		$	6,304,311	$	109,658		$	(11,872	)	$	6,402,097

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Including interest expense to affiliated trusts.

(3) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

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Balance Sheet Components - Materials and Supplies, Fuel Stock and Stored Natural Gas (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Materials and supplies	$ 56,368	$ 53,258
Fuel stock	4,843	4,658
Stored natural gas	1,949	9,535
Total	$ 63,160	$ 67,451

XML

Balance Sheet Components - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$ 4,810	$ 4,336
Prepayments	25,984	24,411
Income taxes receivable	44,371	49,814
Other	7,757	6,324
Total	$ 82,922	$ 84,885

XML

Balance Sheet Components - Net Utility Property (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Utility plant in service	$ 6,865,652	$ 6,809,797
Construction work in progress	193,685	175,767
Total	7,059,337	6,985,564
Less: Accumulated depreciation and amortization	2,032,234	1,993,952
Total net utility property	$ 5,027,103	$ 4,991,612

XML

Balance Sheet Components - Other Property and Investments-Net and Other Non-current Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Operating lease ROU assets		$ 71,410	$ 71,891
Finance lease ROU assets		46,428	47,338
Non-utility property		18,398	19,508
Equity investments		61,132	59,318
Investment in affiliated trust		11,547	11,547
Notes receivable		14,665	14,454
Deferred compensation assets		9,469	9,174
Assets held for sale	[1]	3,363	3,462
Other		27,552	26,947
Total		$ 263,964	$ 263,639

[1] The Company is in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub

XML

Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Accrued taxes other than income taxes	$ 56,630	$ 45,099
Derivative liabilities	8,644	14,008
Employee paid time off accruals	28,775	26,495
Accrued interest	28,920	17,083
Pensions and other postretirement benefits	10,512	11,987
Other	28,151	35,159
Total other current liabilities	$ 161,632	$ 149,831

XML

Balance Sheet Components - Schedule of Other Non-Current Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Operating lease liabilities	$ 68,276	$ 67,716
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Total	Total
Finance lease liabilities	$ 48,044	$ 48,815
Deferred investment tax credits	29,728	29,866
Asset retirement obligations	17,126	17,194
Derivative liabilities	8,959	37,427
Other	14,524	13,981
Total	$ 186,657	$ 214,999

XML

Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Regulated Asset Liability [Line Items]
Regulatory assets	$ 29,225	$ 13,673
Non-current regulatory assets	705,921	750,443
Regulatory liabilities	45,067	46,435
Non-current regulatory liabilities	783,784	784,820
Deferred Income Tax Charge [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	15,013	14,952
Non-current regulatory liabilities	395,859	399,677
Power Deferrals Regulatory Liability [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	18,955	20,299
Non-current regulatory liabilities	13,859	17,570
Decoupling Surcharge [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,396	1,447
Non-current regulatory liabilities	1,604	1,519
Removal Costs [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	330,897	325,832
Interest Rate Swaps [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	17,218	15,046
COVID-19 Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	11,628	10,949
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	9,703	9,737
Non-current regulatory liabilities	12,719	14,227
Energy commodity derivatives
Regulated Asset Liability [Line Items]
Regulatory assets	3,637	2,073
Non-current regulatory assets	3,237	5,722
Decoupling Surcharge [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	18,150	7,123
Non-current regulatory assets	6,812	17,123
Pension and Other Postretirement Benefit Plans [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	196,153	198,746
Interest Rate Swaps [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	177,824	214,851
Deferred Income Tax Charge [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	111,537	108,517
Settlement with Coeur d'Alene Tribe [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	39,764	40,043
AFUDC Above FERC Allowed Rate [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	48,270	47,393
Demand Side Management Programs [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	904	3,814
Utility Plant to be Abandoned [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	27,599	28,916
COVID-19 Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	11,759	8,166
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	7,438	4,477
Non-current regulatory assets	$ 82,062	$ 77,152

XML

Revenue - Schedule of Utilities Operating Revenue Expense Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue From Contract With Customer [Abstract]
Utility-related taxes	$ 19,696	$ 18,700

XML

Revenue - Additional Information (Details) $ in Millions	Mar. 31, 2021 USD ($)
Revenue From Contract With Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 21.2

XML

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 412,870	$ 390,230
Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	119,271	113,843
Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	81,056	85,048
Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	26,610	24,711
Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	1,912	1,844
Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	228,849	225,446
Transmission Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	3,495	3,774
Other Electric Revenues from Contracts With Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	6,140	5,289
Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	238,484	234,509
Avista Utilities [Member]
Disaggregation of Revenue [Line Items]
Revenues	399,860	377,205
Avista Utilities [Member] | Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	358,613	351,628
Avista Utilities [Member] | Derivative revenues
Disaggregation of Revenue [Line Items]
Revenues	34,981	31,075
Avista Utilities [Member] | Alternative Revenue Programs [Member]
Disaggregation of Revenue [Line Items]
Revenues	499	(4,413)
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers
Disaggregation of Revenue [Line Items]
Revenues	3,189	(2,606)
Avista Utilities [Member] | Other Utility Revenues
Disaggregation of Revenue [Line Items]
Revenues	2,578	1,521
Alaska Electric Light & Power [Member]
Disaggregation of Revenue [Line Items]
Revenues	12,821	12,202
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	12,779	12,126
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers
Disaggregation of Revenue [Line Items]
Revenues	(47)	(48)
Alaska Electric Light & Power [Member] | Other Utility Revenues
Disaggregation of Revenue [Line Items]
Revenues	89	124
Corporate and Other [Member] | Other Revenues
Disaggregation of Revenue [Line Items]
Revenues	189	823
Avista Utilities [Member] | Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	113,223	107,977
Avista Utilities [Member] | Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	76,284	78,849
Avista Utilities [Member] | Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	24,711	24,711
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	1,852	1,783
Avista Utilities [Member] | Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	216,070	213,320
Avista Utilities [Member] | Transmission Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	3,495	3,774
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	6,140	5,289
Avista Utilities [Member] | Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	225,705	222,383
Avista Utilities [Member] | Residential Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	87,501	84,173
Avista Utilities [Member] | Commercial and Governmental Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	39,775	39,401
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	2,224	2,194
Avista Utilities [Member] | Retail Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	129,500	125,768
Avista Utilities [Member] | Transportation Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	2,283	2,352
Avista Utilities [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	132,908	129,245
Avista Utilities [Member] | Other Natural Gas Revenues from Contracts With Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	1,125	1,125
Alaska Electric Light & Power [Member] | Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	6,048	5,866
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	4,772	6,199
Alaska Electric Light & Power [Member] | Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	1,899	0
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	60	61
Alaska Electric Light & Power [Member] | Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	12,779	12,126
Alaska Electric Light & Power [Member] | Transmission Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	0	0
Alaska Electric Light & Power [Member] | Other Electric Revenues from Contracts With Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	0	0
Alaska Electric Light & Power [Member] | Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 12,779	$ 12,126

XML

Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) MWh in Thousands, MMBTU in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 MWh MMBTU	Dec. 31, 2020 MWh MMBTU
Purchase [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MWh	3	1
2022 | MWh	0	0
2023 | MWh	0	0
2024 | MWh	0	0
2025 | MWh	0	0
Purchase [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MMBTU	7,434	10,353
2022 | MMBTU	450	450
2023 | MMBTU	0	0
2024 | MMBTU	0	0
2025 | MMBTU	0	0
Purchase [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MWh	92	224
2022 | MWh	0	0
2023 | MWh	0	0
2024 | MWh	0	0
2025 | MWh	0	0
Purchase [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MMBTU	48,028	65,188
2022 | MMBTU	29,345	25,525
2023 | MMBTU	6,920	4,950
2024 | MMBTU	0	0
2025 | MMBTU	0	0
Sales [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MWh	40	17
2022 | MWh	0	0
2023 | MWh	0	0
2024 | MWh	0	0
2025 | MWh	0	0
Sales [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MMBTU	8,045	5,448
2022 | MMBTU	1,360	1,360
2023 | MMBTU	1,360	1,360
2024 | MMBTU	1,370	1,370
2025 | MMBTU	1,115	1,115
Sales [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MWh	754	451
2022 | MWh	0	0
2023 | MWh	0	0
2024 | MWh	0	0
2025 | MWh	0	0
Sales [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2021 | MMBTU	29,520	39,273
2022 | MMBTU	12,950	12,030
2023 | MMBTU	1,970	900
2024 | MMBTU	0	0
2025 | MMBTU	0	0

XML

Derivatives and Risk Management - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2021 MWh MMBTU	Dec. 31, 2020 MWh MMBTU
Canadian [Member]
Derivative [Line Items]
Number of days Canadian currency prices are settled with U.S. dollars	60 days
Purchase [Member] | Physical [Member] | Electric Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MWh	0	0
Purchase [Member] | Physical [Member] | Gas Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MMBTU	0	0
Purchase [Member] | Financial [Member] | Electric Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MWh	0	0
Purchase [Member] | Financial [Member] | Gas Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MMBTU	0	0
Sales [Member] | Physical [Member] | Electric Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MWh	0	0
Sales [Member] | Physical [Member] | Gas Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MMBTU	0	0
Sales [Member] | Financial [Member] | Electric Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MWh	0	0
Sales [Member] | Financial [Member] | Gas Derivative [Member]
Derivative [Line Items]
Expected deliveries of energy commodity derivatives after five years | MMBTU	0	0

XML

Derivatives and Risk Management - Summary of Foreign Currency Exchange Derivatives (Details) $ in Thousands, $ in Thousands	Mar. 31, 2021 USD ($) derivative_contracts	Mar. 31, 2021 CAD ($) derivative_contracts	Dec. 31, 2020 USD ($) derivative_contracts	Dec. 31, 2020 CAD ($) derivative_contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number of contracts | derivative_contracts	25	25	22	22
United States of America, Dollars [Member] | Foreign Exchange Contract [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount	$ 4,916		$ 3,860
Canada, Dollars [Member] | Foreign Exchange Contract [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount		$ 6,178		$ 4,949

XML

Derivatives and Risk Management - Summary of Unsettled Interest Rate Swap Derivatives (Details) - Interest Rate Swap [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract
2021 [Member]
Derivatives, Fair Value [Line Items]
Number of Contracts | Contract	4	4
Notional Amount | $	$ 45,000	$ 45,000
Mandatory Cash Settlement Date	2021	2021
2022 [Member]
Derivatives, Fair Value [Line Items]
Number of Contracts | Contract	12	11
Notional Amount | $	$ 130,000	$ 120,000
Mandatory Cash Settlement Date	2022	2022
2023 [Member]
Derivatives, Fair Value [Line Items]
Number of Contracts | Contract	1	1
Notional Amount | $	$ 10,000	$ 10,000
Mandatory Cash Settlement Date	2023	2023

XML

Derivatives and Risk Management - Schedules of Fair Values and Locations of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Gross Asset	$ 28,520	$ 24,702
Gross Liability	(48,118)	(83,280)
Collateral Netted	6,696	8,666
Net Asset (Liability) on Balance Sheet	(12,902)	(49,912)
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Collateral Netted	2,786	616
Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	0
Gross Liability	(22)
Collateral Netted	0
Net Asset (Liability) on Balance Sheet	(22)
Other Current Liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	0	0
Gross Liability	(10,978)	(19,575)
Collateral Netted	3,910	8,050
Net Asset (Liability) on Balance Sheet	(7,068)	(11,525)
Other Current Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	17,458	11,037
Gross Liability	(21,820)	(14,007)
Collateral Netted	2,786	487
Net Asset (Liability) on Balance Sheet	(1,576)	(2,483)
Other Current Assets [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Asset		30
Gross Liability		0
Collateral Netted		0
Net Asset (Liability) on Balance Sheet		30
Other Current Assets [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	1,743
Gross Liability	0
Collateral Netted	0
Net Asset (Liability) on Balance Sheet	1,743
Other Current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	749	9,203
Gross Liability	(24)	(8,306)
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	725	897
Other Property And Investments Net And Other Non-current Assets [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	4,613
Gross Liability	(3,820)
Collateral Netted	0
Net Asset (Liability) on Balance Sheet	793
Other Property And Investments Net And Other Non-current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	2,598	1,755
Gross Liability	(1,136)	(1,159)
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	1,462	596
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	1,264	952
Gross Liability	(5,525)	(32,190)
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	(4,261)	(31,238)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	95	1,725
Gross Liability	(4,793)	(8,043)
Collateral Netted	0	129
Net Asset (Liability) on Balance Sheet	$ (4,698)	$ (6,189)

XML

Derivatives and Risk Management - Schedule of Collateral Outstanding Related to Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Balance sheet offsetting	$ 6,696	$ 8,666
Commodity Contracts [Member]
Derivative [Line Items]
Cash collateral posted	7,596	4,953
Letters of credit outstanding	12,500	23,500
Balance sheet offsetting	2,786	616
Interest Rate Swap [Member]
Derivative [Line Items]
Cash collateral posted	3,910	8,050
Liabilities with credit-risk-related contingent features	14,956	50,813
Additional collateral to post	$ 11,046	$ 42,763

XML

Pension Plans and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Payment for pension benefits	$ 14,000,000	$ 7,300,000
Percentage of service related net periodic benefit costs capitalized to utility property	40.00%
Percentage of service related net periodic benefit costs recorded to operating expenses	60.00%
Percentage of non-service related net periodic benefit costs capitalized to regulatory assets	40.00%
Percentage of non-service related net periodic benefit costs recorded to other expense	60.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to pension plan	$ 42,000,000

XML

Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,246	$ 5,546
Interest cost	6,580	6,971
Expected return on plan assets	(9,775)	(9,125)
Amortization of prior service cost	75	75
Net loss recognition	1,823	1,654
Net periodic benefit cost	4,949	5,121
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,008	979
Interest cost	1,376	1,515
Expected return on plan assets	(675)	(630)
Amortization of prior service cost	(275)	(275)
Net loss recognition	1,173	1,243
Net periodic benefit cost	$ 2,607	$ 2,832

XML

Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 16,838	$ 11,961
Tax effect of regulatory treatment of utility plant differences	(3,240)	(2,402)
State income tax expense	552	1,227
Settlement of equity awards	930	165
Other	(2,916)	(2,419)
Total income tax expense	$ 12,164	$ 8,532
Federal income taxes at statutory rates	21.00%	21.00%
Tax effect of regulatory treatment of utility plant differences	(4.00%)	(4.20%)
State income tax expense	0.70%	2.10%
Settlement of equity awards	1.10%	0.30%
Other	(3.60%)	(4.20%)
Total income tax expense	15.20%	15.00%

XML

Committed Lines of Credit - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Apr. 30, 2014
Avista Utilities [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity			$ 400,000,000.0
Line of credit facility, expiration date	2022-04
Line of credit facility additional expiration period	1 year
Line of credit, current	$ 93,000,000	$ 102,000,000
Letters of credit outstanding at end of period	16,618,000	27,618,000
Alaska Electric Light & Power [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000,000.0
Line of credit facility, expiration date	2024-11
Line of credit, current	$ 0	1,000,000.0
Letters of credit outstanding at end of period	$ 0	$ 0

XML

Committed Lines of Credit - Schedule of Balances Outstanding and Interest Rates of Borrowings (Excluding Letters of Credit) (Details) - Avista Utilities [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Balance outstanding at end of period	$ 93,000	$ 102,000
Letters of credit outstanding at end of period	$ 16,618	$ 27,618
Average interest rate at end of period	1.17%	1.22%

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Credit Agreement - Additional Information (Details) - Avista Utilities [Member] $ in Millions	1 Months Ended
	Apr. 30, 2020 USD ($)
Short-term Debt [Line Items]
Credit agreement amount borrowed	$ 100.0
Credit agreement, expiration month and year	2021-04
Maximum borrowing capacity credit agreement	$ 100.0

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Long- Term Debt to Affiliated Trust - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2000	Dec. 31, 1997
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary trust	$ 51.5		$ 51.5
Proceeds from the issuance of common trust securities			1.5
Payments for repurchase of trust preferred securities		$ 10.0
Avista Corp [Member]
Debt Instrument [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Proceeds from (repurchase of) trust preferred securities			$ 50.0
Debt instrument, description of variable rate basis	LIBOR
Debt instrument, basis spread on variable rate	0.875%

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Long-Term Debt to Affiliated Trust - Schedule of Distribution Rates Paid (Details) - Trust Preferred Securities Subject to Mandatory Redemption [Member]	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest rate	1.07%	1.10%
Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.07%	1.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest rate	1.10%	2.79%

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Fair Value - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Level 2 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 963,500	$ 963,500
Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	1,129,375	1,189,824
Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	1,060,000	1,060,000
Level 3 [Member] | Reported Value Measurement [Member] | Alaska Electric Light & Power [Member] | Finance Lease [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance Lease, Liability	51,016	51,750
Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	1,081,300	1,235,248
Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Alaska Electric Light & Power [Member] | Finance Lease [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance Lease, Liability	51,000	58,700
Affiliated Entity [Member] | Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	51,547	51,547
Affiliated Entity [Member] | Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 43,815	$ 43,815

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Fair Value - Additional Information (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 21,647	$ 14,196
Fixed Income Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 200	$ 500
Measurement Input, Quoted Price [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, measurement input	100.0
Measurement Input, Quoted Price [Member] | Minimum [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, measurement input	85.00
Measurement Input, Quoted Price [Member] | Maximum [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, measurement input	136.39

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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	$ 28,520	$ 24,702
Liability	48,118	83,280
Fair Value, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	13,992	10,222
Financial Liabilities Fair Value Disclosure	17,625	51,435
Counterparty and Cash Collateral Netting, Assets	(23,797)	(23,179)
Counterparty and Cash Collateral Netting, Liabilities	(30,493)	(31,845)
Fair Value, Recurring [Member] | Fixed Income Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	2,154	2,471
Fair Value, Recurring [Member] | Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	7,115	6,228
Fair Value, Recurring [Member] | Energy commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and Cash Collateral Netting, Assets	(18,618)	(22,152)
Derivative Asset	2,187	1,493
Counterparty and Cash Collateral Netting, Liabilities	(21,404)	(22,768)
Derivative Liability	73	262
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and Cash Collateral Netting, Assets	(5,084)	(952)
Derivative Asset	2,536
Counterparty and Cash Collateral Netting, Liabilities	(8,994)	(9,002)
Derivative Liability	11,329	42,763
Fair Value, Recurring [Member] | Natural Gas Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and Cash Collateral Netting, Assets	(95)	(75)
Counterparty and Cash Collateral Netting, Liabilities	(95)	(75)
Derivative Liability	6,201	8,410
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		30
Derivative Liability	22
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	9,269	8,699
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed Income Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	2,154	2,471
Fair Value, Recurring [Member] | Level 1 [Member] | Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	7,115	6,228
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	28,425	24,627
Financial Liabilities Fair Value Disclosure	41,822	74,795
Fair Value, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	20,805	23,645
Liability	21,477	23,030
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	7,620	952
Liability	20,323	51,765
Fair Value, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset		30
Liability	22
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	95	75
Financial Liabilities Fair Value Disclosure	6,296	8,485
Fair Value, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	95	75
Liability	$ 6,296	$ 8,485

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Fair Value - Schedule of Quantitative Information (Details) - Natural Gas Exchange Agreements [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) MMBTU $ / MMBTU	Dec. 31, 2020 USD ($)
Purchase [Member] | Minimum [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	1.84
Transaction/Delivery Volumes | MMBTU	130,000
Purchase [Member] | Maximum [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	2.85
Transaction/Delivery Volumes | MMBTU	310,000
Purchase [Member] | Weighted Average [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	2.21
Sales [Member] | Minimum [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	1.90
Transaction/Delivery Volumes | MMBTU	75,000
Sales [Member] | Maximum [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	4.25
Transaction/Delivery Volumes | MMBTU	310,000
Sales [Member] | Weighted Average [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative, Forward Price	3.53
Fair Value, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Derivative Liability | $	$ (6,201)	$ (8,410)

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Fair Value - Schedule of Activity For Energy Commodity Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Natural Gas Exchange Agreements [Member] - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ (8,410)	$ (2,976)
Included in regulatory assets/liabilities	3,220	485
Settlements	(1,011)	238
Ending Balance	$ (6,201)	$ (2,253)

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Common Stock - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, shares authorized	200,000,000		200,000,000
Sales Agency Agreement [Member]
Class Of Stock [Line Items]
Common stock, shares authorized	3,200,000
Common stock shares authorized under sales agency agreements remaining shares authorized to sell	1,300,000
Number of share requested to regulatory authority	3,000,000.0
Shares issued under sales agency agreements	0	0

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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Loss [Abstract]
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $3,738 and $3,822, respectively	$ 14,063	$ 14,378

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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Loss [Abstract]
Accumulated other comprehensive income (loss), pension and other postretirement benefit plans net unamortized (gain) loss, tax	$ 3,738	$ 3,822

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Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of net prior service cost	$ (200)	$ (200)
Amortization of net loss	3,191	3,100
Adjustment due to effects of regulation	(2,592)	(2,641)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, before tax	399	259
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax	(84)	(54)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax	$ 315	$ 205

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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 68,017	$ 48,424
Denominator:
Weighted-average number of common shares outstanding-basic	69,293	67,239
Effect of dilutive securities:
Performance and restricted stock awards	213	142
Weighted-average number of common shares outstanding-diluted	69,506	67,381
Earnings per common share:
Basic	$ 0.98	$ 0.72
Diluted	$ 0.98	$ 0.72

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Earnings Per Common Share - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	0	0

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Commitments and Contingencies - Additional Information (Details) - Damage from Fire [Member]	1 Months Ended
	Aug. 31, 2019 USD ($)	Sep. 02, 2020 a Building
Boyds Fire [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value | $	$ 4,400,000
Labor Day Windstorm [Member]
Loss Contingencies [Line Items]
Wildfire covered area | a		22,000
Number of residential, commercial and other structures impacted | Building		230

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Information by Business Segments - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 Reportable_Segments
Segment Reporting [Abstract]
Number of reportable segments	2

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Information by Business Segments - Schedule of Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 412,870	$ 390,230
Resource costs	134,579	129,547
Other operating expenses	88,739	95,856
Depreciation and amortization	55,348	51,656
Income (loss) from operations	101,895	82,193
Interest expense	26,413	26,617
Income taxes	12,164	8,532
Net income (loss)	68,017	48,424
Capital expenditures	97,231	95,635
Total Assets	6,399,496		$ 6,402,097
Operating Segments [Member] | Utility Revenue [Member]
Segment Reporting Information [Line Items]
Operating revenues	412,681	389,407
Resource costs	134,579	129,547
Other operating expenses	87,555	94,496
Depreciation and amortization	55,221	51,421
Income (loss) from operations	103,017	82,780
Interest expense	26,325	26,572
Income taxes	12,051	8,705
Net income (loss)	67,534	49,374
Capital expenditures	97,203	95,526
Total Assets	6,302,056		6,304,311
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]
Segment Reporting Information [Line Items]
Operating revenues	399,860	377,205
Resource costs	133,840	129,557
Other operating expenses	84,599	91,279
Depreciation and amortization	52,724	48,974
Income (loss) from operations	96,693	76,534
Interest expense	24,800	24,983
Income taxes	10,718	7,404
Net income (loss)	64,058	45,979
Capital expenditures	96,394	94,056
Total Assets	6,031,502		6,035,340
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]
Segment Reporting Information [Line Items]
Operating revenues	12,821	12,202
Resource costs	739	(10)
Other operating expenses	2,956	3,217
Depreciation and amortization	2,497	2,447
Income (loss) from operations	6,324	6,246
Interest expense	1,525	1,589
Income taxes	1,333	1,301
Net income (loss)	3,476	3,395
Capital expenditures	809	1,470
Total Assets	270,554		268,971
Other [Member] | Non-Utility Revenue [Member]
Segment Reporting Information [Line Items]
Operating revenues	189	823
Resource costs	0	0
Other operating expenses	1,184	1,360
Depreciation and amortization	127	235
Income (loss) from operations	(1,122)	(587)
Interest expense	129	131
Income taxes	113	(173)
Net income (loss)	483	(950)
Capital expenditures	28	109
Total Assets	110,117		109,658
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues	0	0
Resource costs	0	0
Other operating expenses	0	0
Depreciation and amortization	0	0
Income (loss) from operations	0	0
Interest expense	(41)	(86)
Income taxes	0	0
Net income (loss)	0	0
Capital expenditures	0	$ 0
Total Assets	$ (12,677)		$ (11,872)