10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☑ 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 001-16189

NiSource Inc.

(Exact name of registrant as specified in its charter)

DE		35-2108964
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)
801 East 86th Avenue
Merrillville,	IN	46410
(Address of principal executive offices)		(Zip Code)

(877) 647-5990

(Registrant’s telephone number, including area code)

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, par value $0.01 per share	NI	NYSE
Depositary Shares, each representing a 1/1,000th ownership interest in a share of 6.50% Series B	NI PR B	NYSE
Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock, par value $0.01 per share, liquidation preference $25,000 per share and a 1/1,000th ownership interest in a share of Series B-1 Preferred Stock, par value $0.01 per share, liquidation preference $0.01 per share
Series A Corporate Units	NIMC	NYSE

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 þ    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 such files.)

Yes þ    No ¨

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

Large accelerated filer þ     Accelerated filer ¨     Emerging growth company ☐     Non-accelerated filer ¨    Smaller reporting 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 ☑

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: Common Stock, $0.01 Par Value: 392,217,046 shares outstanding at April 26, 2021.

NISOURCE INC.

FORM 10-Q QUARTERLY REPORT

FOR THE QUARTER ENDED MARCH 31, 2021

Table of Contents

			Page
	Defined Terms		3
PART I	FINANCIAL INFORMATION
	Item 1.	Financial Statements - unaudited
		Condensed Statements of Consolidated Income (unaudited)	7
		Condensed Statements of Consolidated Comprehensive Income (Loss) (unaudited)	8
		Condensed Consolidated Balance Sheets (unaudited)	9
		Condensed Statements of Consolidated Cash Flows (unaudited)	11
		Condensed Statements of Consolidated Equity (unaudited)	12
		Notes to Condensed Consolidated Financial Statements (unaudited)	14
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	52
	Item 4.	Controls and Procedures	52
PART II	OTHER INFORMATION
	Item 1.	Legal Proceedings	53
	Item 1A.	Risk Factors	53
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	54
	Item 3.	Defaults Upon Senior Securities	54
	Item 4.	Mine Safety Disclosures	54
	Item 5.	Other Information	54
	Item 6.	Exhibits	55
	Signature		56

2

DEFINED TERMS
The following is a list of frequently used abbreviations or acronyms that are found in this report:
NiSource Subsidiaries, Affiliates and Former Subsidiaries
Columbia of Kentucky	Columbia Gas of Kentucky, Inc.
Columbia of Maryland	Columbia Gas of Maryland, Inc.
Columbia of Massachusetts	Bay State Gas Company
Columbia of Ohio	Columbia Gas of Ohio, Inc.
Columbia of Pennsylvania	Columbia Gas of Pennsylvania, Inc.
Columbia of Virginia	Columbia Gas of Virginia, Inc.
NIPSCO	Northern Indiana Public Service Company LLC
NiSource ("we," "us" or "our")	NiSource Inc.
Rosewater	Rosewater Wind Generation LLC and its wholly owned subsidiary, Rosewater Wind Farm LLC
Abbreviations and Other
ACE	Affordable Clean Energy
AFUDC	Allowance for funds used during construction
AOCI	Accumulated Other Comprehensive Income (Loss)
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
ATM	At-the-market
BTA	Build-transfer agreement
CCRs	Coal Combustion Residuals
CEP	Capital Expenditure Program
CERCLA	Comprehensive Environmental Response Compensation and Liability Act (also known as Superfund)
COVID-19 ("the COVID-19 pandemic" or "the pandemic")	Novel Coronavirus 2019
DSIC	Distribution System Improvement Charge
DPU	Department of Public Utilities
EPA	United States Environmental Protection Agency
EPS	Earnings per share
FAC	Fuel adjustment clause
FMCA	Federally Mandated Cost Adjustment
GAAP	Generally Accepted Accounting Principles
GCA	Gas cost adjustment
GHG	Greenhouse gases
GWh	Gigawatt hours
HLBV	Hypothetical Liquidation at Book Value
IRP	Infrastructure Replacement Program
IURC	Indiana Utility Regulatory Commission
LIBOR	London InterBank Offered Rate
LIFO	Last In, First Out
MA DOR	Massachusetts Department of Revenue
Massachusetts Business	All of the assets sold to, and liabilities assumed by, Eversource pursuant to the Asset Purchase Agreement

3

DEFINED TERMS
MGP	Manufactured Gas Plant
MISO	Midcontinent Independent System Operator
MMDth	Million dekatherms
MW	Megawatts
MWh	Megawatt hours
NTSB	National Transportation Safety Board
NYMEX	New York Mercantile Exchange
OPEB	Other Postretirement Benefits
PHMSA	Pipeline and Hazardous Materials Safety Administration
PPA	Power Purchase Agreement
PSC	Public Service Commission
PUC	Public Utilities Commission
RCRA	Resource Conservation and Recovery Act
RFP	Request for proposals
SAVE	Steps to Advance Virginia's Energy Plan
SEC	Securities and Exchange Commission
SMRP	Safety Modification and Replacement Program
SMS	Safety Management System
STRIDE	Strategic Infrastructure Development Enhancement
TCJA	An Act to provide for reconciliation pursuant to titles II and V of the concurrent resolution on the budget for fiscal year 2018 (commonly known as the Tax Cuts and Jobs Act of 2017)
TDSIC	Transmission, Distribution and Storage System Improvement Charge
VIE	Variable Interest Entity

Note regarding forward-looking statements

This Quarterly Report on Form 10-Q contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Investors and prospective investors should understand that many factors govern whether any forward-looking statement contained herein will be or can be realized. Any one of those factors could cause actual results to differ materially from those projected. These forward-looking statements include, but are not limited to, statements concerning our plans, strategies, objectives, expected performance, expenditures, recovery of expenditures through rates, stated on either a consolidated or segment basis, and any and all underlying assumptions and other statements that are other than statements of historical fact. Expressions of future goals and expectations and similar expressions, including "may," "will," "should," "could," "would," "aims," "seeks," "expects," "plans," "anticipates," "intends," "believes," "estimates," "predicts," "potential," "targets," "forecast," and "continue," reflecting something other than historical fact are intended to identify forward-looking statements. All forward-looking statements are based on assumptions that management believes to be reasonable; however, there can be no assurance that actual results will not differ materially.

Factors that could cause actual results to differ materially from the projections, forecasts, estimates and expectations discussed in this Quarterly Report on Form 10-Q include, among other things, our ability to execute our business plan or growth strategy, including utility infrastructure investments; potential incidents and other operating risks associated with our business; our ability to adapt to, and manage costs related to, advances in technology; impacts related to our aging infrastructure; our ability to obtain sufficient insurance coverage and whether such coverage will protect us against significant losses; the success of our electric generation strategy; construction risks and natural gas costs and supply risks; fluctuations in demand from residential and commercial customers; fluctuations in the price of energy commodities and related transportation costs or an inability to obtain an adequate, reliable and cost-effective fuel supply to meet customer demands; the attraction and retention of a qualified workforce and ability to maintain good labor relations; our ability to manage new initiatives and organizational changes; the performance of third-party suppliers and service providers; potential cyber-attacks; any damage to our reputation; any remaining liabilities or impact related to the sale of the Massachusetts Business; the impacts of natural disasters, potential terrorist attacks or other catastrophic events; the impacts of climate change and extreme weather conditions; our debt obligations; any changes to our credit rating or the credit rating of certain of our subsidiaries; adverse economic and capital

4

market conditions or increases in interest rates; economic regulation and the impact of regulatory rate reviews; our ability to obtain expected financial or regulatory outcomes; continuing and potential future impacts from the COVID-19 pandemic; economic conditions in certain industries; the reliability of customers and suppliers to fulfill their payment and contractual obligations; the ability of our subsidiaries to generate cash; pension funding obligations; potential impairments of goodwill; changes in the method for determining LIBOR and the potential replacement of the LIBOR benchmark interest rate; the outcome of legal and regulatory proceedings, investigations, incidents, claims and litigation; potential remaining liabilities related to the Greater Lawrence Incident; compliance with the agreements entered into with the U.S. Attorney’s Office to settle the U.S. Attorney’s Office’s investigation relating to the Greater Lawrence Incident; compliance with applicable laws, regulations and tariffs; compliance with environmental laws and the costs of associated liabilities; changes in taxation; other matters in the “Risk Factors” section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020; and matters related to our Equity Units as set forth in the "Risk Factors" section of this Quarterly Report on Form 10-Q, many of which risks are beyond our control. In addition, the relative contributions to profitability by each business segment, and the assumptions underlying the forward-looking statements relating thereto, may change over time.

All forward-looking statements are expressly qualified in their entirety by the foregoing cautionary statements. We undertake no obligation to, and expressly disclaim any such obligation to, update or revise any forward-looking statements to reflect changed assumptions, the occurrence of anticipated or unanticipated events or changes to the future results over time or otherwise, except as required by law.

5

Index	Page
Condensed Statements of Consolidated Income (unaudited)	7
Condensed Statements of Consolidated Comprehensive Income (Loss) (unaudited)	8
Condensed Consolidated Balance Sheets (unaudited)	9
Condensed Statements of Consolidated Cash Flows (unaudited)	11
Condensed Statements of Consolidated Equity (unaudited)	12
Notes to Condensed Consolidated Financial Statements (unaudited)	14
1. Basis of Accounting Presentation	14
2. Recent Accounting Pronouncements	15
3. Revenue Recognition	15
4. Earnings Per Share	18
5. Equity	18
6. Gas in Storage	19
7. Property, Plant and Equipment	19
8. Regulatory Matters	20
9. Risk Management Activities	20
10. Fair Value	22
11. Transfers of Financial Assets	24
12. Goodwill	25
13. Income Taxes	25
14. Pension and Other Postretirement Benefits	25
15. Variable Interest Entities	26
16. Short-Term Borrowings	27
17. Other Commitments and Contingencies	28
18. Accumulated Other Comprehensive Loss	32
19. Other, Net	33
20. Business Segment Information	33
21. Subsequent Event	34

6

PART I

ITEM 1. FINANCIAL STATEMENTS

NiSource Inc.

Condensed Statements of Consolidated Income (unaudited)

	Three Months Ended March 31,
(in millions, except per share amounts)	2021		2020
Operating Revenues
Customer revenues	$	1,506.5	$	1,525.9
Other revenues	39.1		79.6
Total Operating Revenues	1,545.6		1,605.5
Operating Expenses
Cost of energy	476.8		462.4
Operation and maintenance	361.5		444.6
Depreciation and amortization	185.0		184.3
Loss on sale of assets, net	8.1		280.1
Other taxes	81.0		85.9
Total Operating Expenses	1,112.4		1,457.3
Operating Income	433.2		148.2
Other Income (Deductions)
Interest expense, net	(84.6)		(92.9)
Other, net	10.5		5.4
Total Other Deductions, Net	(74.1)		(87.5)
Income before Income Taxes	359.1		60.7
Income Taxes	62.6		(14.9)
Net Income	296.5		75.6
Net income attributable to noncontrolling interest	1.0		—
Net Income attributable to NiSource	295.5		75.6
Preferred dividends	(13.8)		(13.8)
Net Income Available to Common Shareholders	281.7		61.8
Earnings Per Share
Basic Earnings Per Share	$	0.72	$	0.16
Diluted Earnings Per Share	$	0.72	$	0.16
Basic Average Common Shares Outstanding	392.7		383.1
Diluted Average Common Shares	393.9		384.1

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

7

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Comprehensive Income (Loss) (unaudited)

	Three Months Ended March 31,
(in millions, net of taxes)	2021		2020
Net Income	$	296.5	$	75.6
Other comprehensive income (loss):
Net unrealized loss on available-for-sale debt securities(1)	(2.5)		(5.4)
Net unrealized gain (loss) on cash flow hedges(2)	84.6		(133.3)
Unrecognized pension and OPEB benefit (costs)(3)	(0.9)		0.7
Total other comprehensive income (loss)	81.2		(138.0)
Comprehensive Income (Loss)	$	377.7	$	(62.4)

(1)Net unrealized loss on available-for-sale debt securities, net of $0.7 million and $1.4 million tax benefit in the first quarter of 2021 and 2020, respectively.

(2)Net unrealized gain (loss) on cash flow hedges, net of $28.0 million tax expense and $44.1 million tax benefit in the first quarter of 2021 and 2020, respectively.

(3)Unrecognized pension and OPEB benefit (costs), net of $0.9 million tax expense and $0.3 million tax benefit in the first quarter of 2021 and 2020, respectively.

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

8

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Consolidated Balance Sheets (unaudited)

(in millions)	March 31, 2021		December 31, 2020
ASSETS
Property, Plant and Equipment
Plant	$	24,524.7	$	24,179.9
Accumulated depreciation and amortization	(7,688.0)		(7,560.4)
Net Property, Plant and Equipment(1)	16,836.7		16,619.5
Investments and Other Assets
Available-for-sale debt securities (amortized cost of $163.8 and $163.9, allowance for credit losses of $0.3 and $0.5, respectively)	167.9		170.9
Other investments	81.5		81.1
Total Investments and Other Assets	249.4		252.0
Current Assets
Cash and cash equivalents	89.1		116.5
Restricted cash	7.6		9.1
Accounts receivable	848.4		843.6
Allowance for credit losses	(53.9)		(52.3)
Accounts receivable, net	794.5		791.3
Gas inventory	48.1		191.2
Materials and supplies, at average cost	145.6		141.5
Electric production fuel, at average cost	52.5		68.4
Exchange gas receivable	53.7		34.1
Regulatory assets	188.9		135.7
Deferred property taxes	104.2		85.6
Prepayments and other	109.3		86.0
Total Current Assets(1)	1,593.5		1,659.4
Other Assets
Regulatory assets	1,791.3		1,794.8
Goodwill	1,485.9		1,485.9
Deferred charges and other	237.7		228.9
Total Other Assets	3,514.9		3,509.6
Total Assets	$	22,194.5	$	22,040.5

(1)Includes $174.2 million and $175.6 million of net property, plant and equipment assets and $4.2 million and $1.7 million of current assets of a consolidated VIE as of March 31, 2021 and December 31, 2020 that may be used only to settle obligations of the consolidated VIE. Refer to Note 15 "Variable Interest Entities" for additional information.

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

9

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Consolidated Balance Sheets (unaudited) (continued)

(in millions, except share amounts)	March 31, 2021		December 31, 2020
CAPITALIZATION AND LIABILITIES
Capitalization
Stockholders’ Equity
Common stock - $0.01 par value, 600,000,000 shares authorized; 392,129,866 and 391,760,051 shares outstanding, respectively	$	3.9	$	3.9
Preferred stock - $0.01 par value, 20,000,000 shares authorized; 440,000 shares outstanding	880.0		880.0
Treasury stock	(99.9)		(99.9)
Additional paid-in capital	6,892.9		6,890.1
Retained deficit	(1,669.8)		(1,765.2)
Accumulated other comprehensive loss	(75.5)		(156.7)
Total NiSource Stockholders’ Equity	5,931.6		5,752.2
Noncontrolling interest in consolidated subsidiaries	94.1		85.6
Total Stockholders' Equity	6,025.7		5,837.8
Long-term debt, excluding amounts due within one year	9,202.3		9,219.8
Total Capitalization	15,228.0		15,057.6
Current Liabilities
Current portion of long-term debt	44.4		23.3
Short-term borrowings	520.0		503.0
Accounts payable	554.9		589.0
Dividends payable - common stock	86.3		—
Dividends payable - preferred stock	19.4		—
Customer deposits and credits	146.7		243.3
Taxes accrued	301.5		244.1
Interest accrued	94.6		104.7
Exchange gas payable	25.5		48.5
Regulatory liabilities	169.6		161.3
Accrued compensation and employee benefits	131.2		141.8
Other accruals	164.7		220.4
Total Current Liabilities	2,258.8		2,279.4
Other Liabilities
Deferred income taxes	1,573.6		1,470.6
Accrued liability for postretirement and postemployment benefits	328.9		336.1
Regulatory liabilities	1,881.0		1,904.2
Asset retirement obligations	479.7		477.1
Other noncurrent liabilities	444.5		515.5
Total Other Liabilities	4,707.7		4,703.5
Commitments and Contingencies (Refer to Note 17, "Other Commitments and Contingencies")
Total Capitalization and Liabilities	$	22,194.5	$	22,040.5

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

10

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Cash Flows (unaudited)

Three Months Ended March 31, (in millions)	2021		2020
Operating Activities
Net Income	$	296.5	$	75.6
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:
Depreciation and amortization	185.0		184.3
Deferred income taxes and investment tax credits	55.2		(19.9)
Loss on sale of assets	8.1		280.2
Other adjustments	3.5		7.9
Changes in Assets and Liabilities:
Components of working capital	(89.3)		(147.1)
Regulatory assets/liabilities	8.4		12.9
Deferred charges and other noncurrent assets	(10.7)		(12.1)
Other noncurrent liabilities	(8.4)		(11.9)
Net Cash Flows from Operating Activities	448.3		369.9
Investing Activities
Capital expenditures	(367.0)		(452.1)
Cost of removal	(26.9)		(34.5)
Purchases of available-for-sale securities	(16.6)		(43.5)
Sales of available-for-sale securities	16.9		45.4
Payment to renewable generation asset developer	(7.4)		—
Other investing activities	(0.8)		0.1
Net Cash Flows used for Investing Activities	(401.8)		(484.6)
Financing Activities
Repayments of long-term debt and finance lease obligations	(5.9)		(4.1)
Issuance of short-term debt (maturity > 90 days)	—		500.0
Change in short-term borrowings, net (maturity ≤ 90 days)	17.0		(226.8)
Issuance of common stock, net of issuance costs	2.8		3.7
Equity costs, premiums and other debt related costs	(2.5)		(5.1)
Contributions from non-controlling interest, net of issuance costs	7.5		—
Dividends paid - common stock	(86.2)		(80.3)
Dividends paid - preferred stock	(8.1)		(8.1)
Net Cash Flows (used for) from Financing Activities	(75.4)		179.3
Change in cash, cash equivalents and restricted cash	(28.9)		64.6
Cash, cash equivalents and restricted cash at beginning of period	125.6		148.4
Cash, Cash Equivalents and Restricted Cash at End of Period	$	96.7	$	213.0

Supplemental Disclosures of Cash Flow Information

Three Months Ended March 31, (in millions)	2021		2020
Non-cash transactions:
Capital expenditures included in current liabilities	$	155.6	$	150.5
Dividends declared but not paid	105.7		99.8
Assets recorded for asset retirement obligations	—		69.8
Obligation to developer at formation of joint venture	$	6.0	$	—

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

11

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Equity (unaudited)

(in millions)	Common Stock		Preferred Stock(1)		Treasury Stock		Additional Paid-In Capital		Retained Deficit		Accumulated Other Comprehensive Loss		Noncontrolling Interest in Consolidated Subsidiaries		Total
Balance as of January 1, 2021	$	3.9	$	880.0	$	(99.9)	$	6,890.1	$	(1,765.2)	$	(156.7)	$	85.6	$	5,837.8
Comprehensive Income:
Net income	—		—		—		—		295.5		—		1.0		296.5
Other comprehensive income, net of tax	—		—		—		—		—		81.2		—		81.2
Dividends:
Common stock ($0.44 per share)	—		—		—		—		(172.6)		—		—		(172.6)
Preferred stock (See Note 5)	—		—		—		—		(27.5)		—		—		(27.5)
Contribution from noncontrolling interest	—		—		—		—		—		—		7.5		7.5
Stock issuances:
Employee stock purchase plan	—		—		—		1.3		—		—		—		1.3
Long-term incentive plan	—		—		—		(0.5)		—		—		—		(0.5)
401(k) and profit sharing	—		—		—		2.3		—		—		—		2.3
ATM program	—		—		—		(0.3)		—		—		—		(0.3)
Balance as of March 31, 2021	$	3.9	$	880.0	$	(99.9)	$	6,892.9	$	(1,669.8)	$	(75.5)	$	94.1	$	6,025.7

(1)Series A and Series B shares have an aggregate liquidation preference of $400M and $500M, respectively. See Note 5, "Equity" for additional information.

(in millions)	Common Stock		Preferred Stock(1)		Treasury Stock		Additional Paid-In Capital		Retained Deficit		Accumulated Other Comprehensive Loss		Noncontrolling Interest in Consolidated Subsidiaries		Total
Balance as of January 1, 2020	$	3.8	$	880.0	$	(99.9)	$	6,666.2	$	(1,370.8)	$	(92.6)	$	—	$	5,986.7
Comprehensive Income:
Net income	—		—		—		—		75.6		—		—		75.6
Other comprehensive loss, net of tax	—		—		—		—		—		(138.0)		—		(138.0)
Dividends:
Common stock ($0.42 per share)	—		—		—		—		(160.7)		—		—		(160.7)
Preferred stock (See Note 5)	—		—		—		—		(27.5)		—		—		(27.5)
Stock issuances:
Employee stock purchase plan	—		—		—		1.3		—		—		—		1.3
Long-term incentive plan	—		—		—		(0.5)		—		—		—		(0.5)
401(k) and profit sharing	—		—		—		4.5		—		—		—		4.5
Balance as of March 31, 2020	$	3.8	$	880.0	$	(99.9)	$	6,671.5	$	(1,483.4)	$	(230.6)	$	—	$	5,741.4

(1)Series A and Series B shares have an aggregate liquidation preference of $400M and $500M, respectively. See Note 5, "Equity" for additional information.

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

12

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Equity (unaudited) (continued)

	Preferred	Common
Shares (in thousands)	Shares	Shares	Treasury	Outstanding
Balance as of January 1, 2021	440	395,723	(3,963)	391,760
Issued:
Employee stock purchase plan	—	55	—	55
Long-term incentive plan	—	212	—	212
401(k) and profit sharing	—	103	—	103
Balance as of March 31, 2021	440	396,093	(3,963)	392,130
	Preferred	Common
Shares (in thousands)	Shares	Shares	Treasury	Outstanding
Balance as of January 1, 2020	440	386,099	(3,963)	382,136
Issued:
Employee stock purchase plan	—	46	—	46
Long-term incentive plan	—	347	—	347
401(k) and profit sharing	—	165	—	165
Balance as of March 31, 2020	440	386,657	(3,963)	382,694

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

13

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited)

1.    Basis of Accounting Presentation

Our accompanying Condensed Consolidated Financial Statements (unaudited) reflect all normal recurring adjustments that are necessary, in the opinion of management, to present fairly the results of operations in accordance with GAAP in the United States of America. The accompanying financial statements include the accounts of us, our majority-owned subsidiaries, and VIEs of which we are the primary beneficiary after the elimination of all intercompany accounts and transactions.

The accompanying financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. Income for interim periods may not be indicative of results for the calendar year due to weather variations and other factors.

The Condensed Consolidated Financial Statements (unaudited) have been prepared pursuant to the rules and regulations of the SEC. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made in this Quarterly Report on Form 10-Q are adequate to make the information herein not misleading.

14

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

2.    Recent Accounting Pronouncements

Recently Issued Accounting Pronouncements

We are currently evaluating the impact of certain ASUs on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited), which are described below:

Standard	Description	Effective Date	Effect on the financial statements or other significant matters
ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Statement	This pronouncement provides temporary optional expedients and exceptions for applying GAAP principles to contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates.	Upon issuance on March 12, 2020, and will apply though December 31, 2022.	We continue to evaluate the temporary expedients and options available under this guidance, and the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited). We are currently identifying and evaluating contracts that may be impacted. As of March 31, 2021, we have not applied any expedients and options available under this ASU.
ASU 2021-01, Reference Rate Reform (Topic 848): Scope
ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivative and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity	This pronouncement simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity's own equity. Specifically, the ASU "simplifies accounting for convertible instruments by removing major separation models required under current GAAP." In addition, the ASU "removes certain settlement conditions that are required for equity contracts to qualify for it" and "simplifies the diluted earnings per share (EPS) calculations in certain areas."	Annual period beginning after December 15, 2021, and interim periods within those fiscal years.	We continue to evaluate the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited) as it pertains to any relevant future activity. We expect to adopt this ASU on its effective date.

Recently Adopted Accounting Pronouncements

Standard

Adoption

ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes

This pronouncement simplifies the accounting for income taxes by eliminating certain exceptions to the general principles in ASC 740, income taxes. It also improves consistency of application for other areas of the guidance by clarifying and amending existing guidance. We adopted the amendments of this pronouncement as of January 1, 2021 with no material impact to the Condensed Consolidated Financial Statements (unaudited).

3.    Revenue Recognition

Revenue Disaggregation and Reconciliation. We disaggregate revenue from contracts with customers based upon reportable segment, as well as by customer class. As our revenues are primarily earned over a period of time and we do not earn a material amount of revenues at a point in time, revenues are not disaggregated as such below. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, and Indiana. We completed the sale of the Massachusetts Business on October 9, 2020. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.

15

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Condensed Statements of Consolidated Income (unaudited) for the three months ended March 31, 2021 and March 31, 2020:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other(2)		Total
Customer Revenues(1)
Residential	$	773.5	$	129.2	$	—	$	902.7
Commercial	271.4		122.9		—		394.3
Industrial	57.9		122.9		—		180.8
Off-system	14.4		—		—		14.4
Miscellaneous	9.9		4.2		0.2		14.3
Total Customer Revenues	$	1,127.1	$	379.2	$	0.2	$	1,506.5
Other Revenues	8.7		23.3		7.1		39.1
Total Operating Revenues	$	1,135.8	$	402.5	$	7.3	$	1,545.6

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

(2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.

Three Months Ended March 31, 2020 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Customer Revenues(1)
Residential	$	796.5	$	119.2	$	—	$	915.7
Commercial	269.4		120.2		—		389.6
Industrial	74.2		109.1		—		183.3
Off-system	18.7		—		—		18.7
Miscellaneous	12.5		5.9		0.2		18.6
Total Customer Revenues	$	1,171.3	$	354.4	$	0.2	$	1,525.9
Other Revenues	56.7		22.9		—		79.6
Total Operating Revenues	$	1,228.0	$	377.3	$	0.2	$	1,605.5

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

Customer Accounts Receivable. Accounts receivable on our Condensed Consolidated Balance Sheets (unaudited) includes both billed and unbilled amounts, as well as certain amounts that are not related to customer revenues. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the date of the last cycle billing through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates and weather. The opening and closing balances of customer receivables for the three months ended March 31, 2021 are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.

(in millions)	Customer Accounts Receivable, Billed (less reserve)		Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020	$	400.0	$	327.2
Balance as of March 31, 2021	507.4		244.3
Increase (Decrease)	$	107.4	$	(82.9)

Utility revenues are billed to customers monthly on a cycle basis. We expect that substantially all customer accounts receivable will be collected following customer billing, as this revenue consists primarily of periodic, tariff-based billings for service and usage. We maintain common utility credit risk mitigation practices, including requiring deposits and actively pursuing collection of past due amounts. Our regulated operations also utilize certain regulatory mechanisms that facilitate recovery of bad debt costs within tariff-based rates, which provides further evidence of collectibility. In connection with the COVID-19 pandemic, certain state regulatory commissions instituted regulatory moratoriums that impacted our ability to pursue our

16

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

standard credit risk mitigation practices. Following the issuance of these moratoriums, certain of our regulated operations have been authorized to recognize a regulatory asset for bad debt costs above levels currently in rates. We have reinstated our common credit mitigation practices where moratoriums have expired (see Note 8, "Regulatory Matters," for additional information on regulatory moratoriums and regulatory assets). It is probable that substantially all of the consideration to which we are entitled from customers will be collected upon satisfaction of performance obligations.

Allowance for Credit Losses. To evaluate for expected credit losses, customer account receivables are pooled based on similar risk characteristics, such as customer type, geography, payment terms, and related macro-economic risks. Expected credit losses are established using a model that considers historical collections experience, current information, and reasonable and supportable forecasts. Relevant and reliable internal and external inputs used in the model include, but are not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-off orders executed data, and final bill data. We continuously evaluate available reasonable and supportable information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or when required by changes in facts and circumstances. When we become aware of a specific commercial or industrial customer's inability to pay, an allowance for expected credit losses is recorded for the relevant amount. We also monitor other circumstances that could affect our overall expected credit losses; these include, but are not limited to, creditworthiness of overall population in service territories, adverse conditions impacting an industry sector, and current economic conditions.

At each reporting period, we record expected credit losses using an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses for the three months ended March 31, 2021 are presented in the table below:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Beginning balance	$	41.8	$	9.7	$	0.8	$	52.3
Current period provisions	5.9		2.9		—		8.8
Write-offs charged against allowance	(9.0)		(2.4)		—		(11.4)
Recoveries of amounts previously written off	4.1		0.1		—		4.2
Ending balance of the allowance for credit losses	$	42.8	$	10.3	$	0.8	$	53.9

As of March 31, 2021, we have also evaluated the adequacy of our allowance for credit losses in light of the suspension of shut-offs for nonpayment due to the COVID-19 pandemic that remain in effect for certain jurisdictions. Our evaluation included an analysis of customer payment trends in 2020, economic conditions, receivables aging, considerations of past economic downturns and the associated allowance for credit losses and customer account write-offs. In addition, we considered benefits available under governmental COVID-19 relief programs, the impact of unemployment benefits initiatives, and flexible payment plans being offered to customers affected by or experiencing hardship as a result of the pandemic, which could help to mitigate the potential for increasing customer account delinquencies. Based upon this evaluation, we have concluded that the allowance for credit losses as of March 31, 2021 adequately reflected the collection risk and net realizable value for our receivables. We will continue to monitor changing circumstances and will adjust our allowance for credit losses accordingly.

17

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

4.    Earnings Per Share

Basic EPS is computed by dividing net income available to common shareholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average shares outstanding for diluted EPS includes the incremental effects of the various long-term incentive compensation plans and an ATM forward agreement under the Treasury Stock Method when the impact would be dilutive (See Note 5 "Equity"). The computation of diluted average common shares is as follows:

	Three Months Ended
	March 31,
(in thousands)	2021	2020
Basic average common shares outstanding	392,657	383,062
Dilutive potential common shares:
Shares contingently issuable under employee stock plans	630	845
Shares restricted under employee stock plans	288	207
Forward Agreement	337	—
Diluted Average Common Shares	393,912	384,114

5.    Equity

ATM Program and Forward Sale Agreement. On February 22, 2021, we entered into six separate equity distribution agreements pursuant to which we are able to sell up to an aggregate of $750.0 million of our common stock.

On February 23, 2021, under the ATM program, we executed a forward agreement, which allows us to issue a fixed number of shares at a price to be settled in the future. From February 24, 2021 to March 17, 2021, we borrowed 6,672,740 shares from third parties, which the dealer sold at a weighted average price of $22.48 per share. We may settle this agreement in shares, cash, or net shares by December 15, 2021. Had we settled all the shares under the forward agreement at March 31, 2021, we would have received approximately $148.5 million, based on a net price of $22.25 per share.

As of March 31, 2021, the ATM program (including the impacts of the forward sale agreement discussed above) had approximately $600.0 million of equity available for issuance. The program expires on December 31, 2023.

Preferred Stock. As of March 31, 2021, we had 20,000,000 shares of preferred stock authorized for issuance, of which 440,000 shares of preferred stock in the aggregate for all series were outstanding. The following table displays preferred dividends declared for the period by outstanding series of shares:

				Three Months Ended March 31,		March 31		December 31,
				2021	2020	2021		2020
(in millions except shares and per share amounts)	Liquidation Preference Per Share		Shares	Dividends Declared Per Share		Outstanding
5.650% Series A	$	1,000.00	400,000	28.25	28.25	$	393.9	$	393.9
6.500% Series B	$	25,000.00	20,000	812.50	812.50	$	486.1	$	486.1

In addition, 20,000 shares of Series B–1 Preferred Stock, par value $0.01 per share, were outstanding as of March 31, 2021. Holders of Series B–1 Preferred Stock are not entitled to receive dividend payments and have no conversion rights. The Series B–1 Preferred Stock is paired with the Series B Preferred Stock and may not be transferred, redeemed or repurchased except in connection with the simultaneous transfer, redemption or repurchase of the underlying Series B Preferred Stock.

As of March 31, 2021 and 2020, Series A Preferred Stock had $6.7 million of cumulative preferred dividends in arrears, or $16.63 per share, and Series B Preferred Stock had $1.4 million of cumulative preferred dividends in arrears, or $72.23 per share.

18

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

6.    Gas in Storage

We use both the LIFO inventory methodology and the weighted-average cost methodology to value natural gas in storage. Gas Distribution Operations prices natural gas storage injections at the average of the costs of natural gas supply purchased during the year. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation credit or debit within the Condensed Consolidated Balance Sheets (unaudited). Due to seasonality requirements, we expect interim variances in LIFO layers to be replenished by year end. We had a temporary LIFO liquidation debit of $22.3 million and zero as of March 31, 2021 and December 31, 2020, respectively, for certain gas distribution companies recorded within “Prepayments and other,” on the Condensed Consolidated Balance Sheets (unaudited).

7.    Property, Plant and Equipment

In 2020, the MISO approved NIPSCO's plan to retire the R.M. Schahfer Generating Station in 2023. The December 2019 NIPSCO electric rate case order included approval to create a regulatory asset upon the retirement of the R.M. Schahfer Generating Station. The order allows for the recovery of and on the net book value of the station by the end of 2032.

In connection with the MISO's approval of NIPSCO's planned retirement of the R.M. Schahfer Generating Station, we recorded plant retirement-related charges during 2020 comprised of write downs of certain capital projects that have been cancelled and materials and supplies inventory balances deemed obsolete due to the planned retirement. As more information becomes available, the retirement date of the R.M. Schahfer Generating Station will be finalized, and additional plant retirement-related charges may be incurred. An immaterial amount of plant retirement-related charges were included within "Operation and maintenance" in the Condensed Statement of Consolidated Income (unaudited) during the three months ended March 31, 2021. On March 11, 2021, NIPSCO submitted modified Attachment Y Notices to MISO requesting an updated retirement date for two of the four coal fired units at R.M. Schahfer Generating Station. The two units are now expected to be retired by the end of 2021, with the remaining two units still scheduled to be retired in 2023. At retirement, the net book value of the retired units will be reclassified from "Net Property, Plant and Equipment", to current and long-term “Regulatory Assets.” The total net book value of R.M. Schahfer Generating Station's coal units and other associated plant was $861.6 million at March 31, 2021.

On April 28, 2021, in response to a Motion filed by certain parties in NIPSCO's quarterly FAC proceeding, the IURC created a sub-docket proceeding in order to receive additional information related to the planned retirements of Units 14 and 15 by the end of 2021 and any resulting cost impacts to customers. NIPSCO does not anticipate that the sub-docket proceeding will impact the planned timing of end of year 2021 for the unit retirements.

19

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

8.    Regulatory Matters

COVID-19 Regulatory Filings

In response to COVID-19, we received approvals or directives from the regulatory commissions in the states in which we operate. The ongoing impacts of these approvals or directives are described in the table below:

Jurisdiction	Moratorium in Place?	Regulatory Asset balance as of March 31, 2021 (in millions)		Deferred COVID-19 Costs
Columbia of Ohio	No	$	2.0	Incremental operation and maintenance expenses
NIPSCO	No	$	12.0	Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order
Columbia of Pennsylvania	No	$	7.1	Incremental bad debt expense incurred since March 13, 2020 above levels currently in rates
Columbia of Virginia	Yes	$	0.1	Incremental incurred costs, subject to an earnings test review
Columbia of Maryland	No	$	1.1	Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic

On March 11, 2021, the Pennsylvania PUC adopted an order, which lifted its prior pandemic-related moratorium on service terminations for non-payments of utility bills beginning April 1, 2021. Pursuant to that order, Pennsylvania utilities are required to offer payment plans on billing arrearages, with the length of such payment plans depending on customers' income levels. The longest such payment plan would be a minimum of five years for residential customers with incomes below 250% of the Federal Poverty Level.

For Columbia of Virginia, the currently effective legislative and regulatory directives related to the COVID-19 pandemic require utilities to offer payment plans between 6 and 24 months, and suspend service disconnections and late payment fees for customers. These directives will remain in place until the Governor determines that the economic and public health conditions have improved such that the prohibition does not need to be in place, or until at least 60 days after such declared state of emergency ends, whichever is sooner.

9.    Risk Management Activities

We are exposed to certain risks relating to our ongoing business operations, namely commodity price risk and interest rate risk. We recognize that the prudent and selective use of derivatives may help to lower our cost of debt capital, manage our interest rate exposure and limit volatility in the price of natural gas.

20

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Risk management assets and liabilities on our derivatives are presented on the Condensed Consolidated Balance Sheets (unaudited) as shown below:

(in millions)	March 31, 2021		December 31, 2020
Risk Management Assets - Current(1)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	1.0		10.4
Total	$	1.0	$	10.4
Risk Management Assets - Noncurrent(2)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	3.2		2.8
Total	$	3.2	$	2.8
Risk Management Liabilities - Current(3)
Interest rate risk programs	$	17.1	$	70.9
Commodity price risk programs	5.0		7.3
Total	$	22.1	$	78.2
Risk Management Liabilities - Noncurrent(4)
Interest rate risk programs	$	40.6	$	99.5
Commodity price risk programs	38.3		45.1
Total	$	78.9	$	144.6

(1)Presented in "Prepayments and other" on the Condensed Consolidated Balance Sheets (unaudited).

(2)Presented in "Deferred charges and other" on the Condensed Consolidated Balance Sheets (unaudited).

(3)Presented in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).

(4)Presented in "Other noncurrent liabilities" on the Condensed Consolidated Balance Sheets (unaudited).

Commodity Price Risk Management

We, along with our utility customers, are exposed to variability in cash flows associated with natural gas purchases and volatility in natural gas prices. We purchase natural gas for sale and delivery to our retail, commercial and industrial customers, and for most customers the variability in the market price of gas is passed through in their rates. Some of our utility subsidiaries offer programs to certain customers whereby variability in the market price of gas is assumed by the respective utility. The objective of our commodity price risk programs is to mitigate the gas cost variability, for us or on behalf of our customers, associated with natural gas purchases or sales by economically hedging the various gas cost components using a combination of futures, options, forwards or other derivative contracts.

NIPSCO received IURC approval to lock in a fixed price for its natural gas customers using long-term forward purchase instruments. The term of these instruments may range from five to 10 years and is limited to 20% of NIPSCO’s average annual GCA purchase volume. Gains and losses on these derivative contracts are deferred as regulatory liabilities or assets and are remitted to or collected from customers through NIPSCO’s quarterly GCA mechanism. These instruments are not designated as accounting hedges.

Interest Rate Risk Management

As of March 31, 2021, we have two forward-starting interest rate swaps with an aggregate notional value totaling $500.0 million to hedge the variability in cash flows attributable to changes in the benchmark interest rate during the periods from the effective dates of the swaps to the anticipated dates of forecasted debt issuances, which are expected to take place by 2024. These interest rate swaps are designated as cash flow hedges. The gains and losses related to these swaps are recorded to AOCI and will be recognized in "Interest expense, net" concurrently with the recognition of interest expense on the associated debt, once issued. If it becomes probable that a hedged forecasted transaction will no longer occur, the accumulated gains or losses on the derivative will be recognized currently in "Other, net" in the Condensed Statements of Consolidated Income (unaudited).

There were no amounts excluded from effectiveness testing for derivatives in cash flow hedging relationships at March 31, 2021 and December 31, 2020.

21

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Our derivative instruments measured at fair value as of March 31, 2021 and December 31, 2020 do not contain any credit-risk-related contingent features.

10.    Fair Value

A.    Fair Value Measurements

Recurring Fair Value Measurements

The following tables present financial assets and liabilities measured and recorded at fair value on our Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2021 and December 31, 2020:

Recurring Fair Value Measurements March 31, 2021 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2021
Assets
Risk management assets	$	—	$	4.2	$	—	$	4.2
Available-for-sale debt securities	—		167.9		—		167.9
Total	$	—	$	172.1	$	—	$	172.1
Liabilities
Risk management liabilities	$	—	$	101.0	$	—	$	101.0
Total	$	—	$	101.0	$	—	$	101.0

Recurring Fair Value Measurements December 31, 2020 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2020
Assets
Risk management assets	$	—	$	13.2	$	—	$	13.2
Available-for-sale debt securities	—		170.9		—		170.9
Total	$	—	$	184.1	$	—	$	184.1
Liabilities
Risk management liabilities	$	—	$	222.8	$	—	$	222.8
Total	$	—	$	222.8	$	—	$	222.8

Risk Management Assets and Liabilities. Risk management assets and liabilities include interest rate swaps, exchange-traded NYMEX futures and NYMEX options and non-exchange-based forward purchase contracts. When utilized, exchange-traded derivative contracts are based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore, nonperformance risk has not been incorporated into these valuations. Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, these instruments may utilize models to measure fair value. We use a similar model to value similar instruments. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability and market-corroborated inputs, (i.e., inputs derived principally from or corroborated by observable market data by correlation or other means). Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized within Level 2. Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized within Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements which reduce exposures. As of March 31, 2021 and December 31, 2020, there were no material transfers

22

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

between fair value hierarchies. Additionally, there were no changes in the method or significant assumptions used to estimate the fair value of our financial instruments.

Credit risk is considered in the fair value calculation of each of our forward-starting interest rate swaps, as described in Note 9, "Risk Management Activities." As they are based on observable data and valuations of similar instruments, the hedges are categorized within Level 2 of the fair value hierarchy. There was no exchange of premium at the initial date of the swaps, and we can settle the contracts at any time.

NIPSCO has entered into long-term forward natural gas purchase instruments to lock in a fixed price for its natural gas customers. We value these contracts using a pricing model that incorporates market-based information when available, as these instruments trade less frequently and are classified within Level 2 of the fair value hierarchy. For additional information, see Note 9, “Risk Management Activities.”

Available-for-Sale Debt Securities. Available-for-sale debt securities are investments pledged as collateral for trust accounts related to our wholly owned insurance company. We value U.S. Treasury, corporate debt and mortgage-backed securities using a matrix pricing model that incorporates market-based information. These securities trade less frequently and are classified within Level 2.

At each reporting date, we quantitatively and qualitatively assess available-for-sale debt securities for impairment. For securities in a loss position that we intend to hold, we perform an analysis to determine whether the unrealized loss is related to credit factors. The analysis focuses on a variety of factors that include, but are not limited to, downgrade on ratings of the security, defaults in the current reporting period or projected defaults in the future, the security's yield spread over treasuries, and other relevant market data. If the unrealized loss is not related to credit factors, it is included in other comprehensive income. If the unrealized loss is related to credit factors, the loss is recognized as credit loss expense in earnings during the period, with an offsetting entry to the allowance for credit losses. The amount of the credit loss recorded to the allowance account is limited by the amount at which the security's fair value is less than its amortized cost basis. If the credit losses in the allowance for credit losses are deemed uncollectible, the allowance on the uncollectible portion is charged off, with an offsetting entry to the carrying value of the security. Subsequent improvements to the estimated credit losses of available-for-sale debt securities are recognized immediately in earnings. As of March 31, 2021 and December 31, 2020, we recorded $0.3 million and $0.5 million, respectively, as an allowance for credit losses on available-for-sale debt securities as a result of the analysis described above. Continuous credit monitoring and portfolio credit balancing mitigates our risk of credit losses on our available-for-sale debt securities.

The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at March 31, 2021 and December 31, 2020 were: 

March 31, 2021 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(1)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	37.1	$	0.2	$	(0.3)	$	—	$	37.0
Corporate/Other debt securities	126.7		5.3		(0.8)		(0.3)		130.9
Total	$	163.8	$	5.5	$	(1.1)	$	(0.3)	$	167.9
December 31, 2020 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(2)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	33.7	$	0.3	$	—	$	—	$	34.0
Corporate/Other debt securities	130.2		7.7		(0.5)		(0.5)		136.9
Total	$	163.9	$	8.0	$	(0.5)	$	(0.5)	$	170.9

(1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $22.1 and $25.7 million, respectively, at March 31, 2021.

(2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 million and $13.2 million, respectively, at December 31, 2020.

Realized gains and losses on available-for-sale securities were immaterial for the three months ended March 31, 2021 and 2020.

23

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

The cost of maturities sold is based upon specific identification. At March 31, 2021, approximately $6.2 million of U.S. Treasury debt securities and approximately $3.9 million of Corporate/Other debt securities have maturities of less than a year.

There are no material items in the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020.

Non-recurring Fair Value Measurements

We measure the fair value of certain assets, including goodwill, on a non-recurring basis, typically annually or when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable.

In March 2021, we reached an agreement with Eversource regarding the final purchase price, including net working capital adjustments to the October 9, 2020 purchase price. The working capital amounts were measured at fair value, less costs to sell.

B.    Other Fair Value Disclosures for Financial Instruments. The carrying amount of cash and cash equivalents, restricted cash, customer deposits and short-term borrowings is a reasonable estimate of fair value due to their liquid or short-term nature. Our long-term borrowings are recorded at historical amounts.

The following method and assumptions were used to estimate the fair value of each class of financial instruments.

Long-term Debt. The fair value of outstanding long-term debt is estimated based on the quoted market prices for the same or similar securities. Certain premium costs associated with the early settlement of long-term debt are not taken into consideration in determining fair value. These fair value measurements are classified within Level 2 of the fair value hierarchy. As of March 31, 2021, there was no change in the method or significant assumptions used to estimate the fair value of long-term debt.

The carrying amount and estimated fair values of these financial instruments were as follows: 

(in millions)	Carrying Amount as of March 31, 2021		Estimated Fair Value as of March 31, 2021		Carrying Amount as of Dec. 31, 2020		Estimated Fair Value as of Dec. 31, 2020
Long-term debt (including current portion)	$	9,246.7	$	10,178.0	$	9,243.1	$	11,034.2

11.    Transfers of Financial Assets

Columbia of Ohio, NIPSCO and Columbia of Pennsylvania each maintain a receivables agreement whereby they transfer their customer accounts receivables to third-party financial institutions through wholly owned and consolidated special purpose entities. The three agreements expire between August 2021 and May 2022 and may be further extended if mutually agreed to by the parties thereto.

All receivables transferred to third parties are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables transferred is determined in part by required loss reserves under the agreements.

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Condensed Consolidated Balance Sheets (unaudited). As of March 31, 2021, the maximum amount of debt that could be recognized related to our accounts receivable programs is $510.0 million.

The following table reflects the gross receivables balance and net receivables transferred, as well as short-term borrowings related to the securitization transactions as of March 31, 2021 and December 31, 2020:

(in millions)	March 31, 2021		December 31, 2020
Gross receivables	$	630.8	$	607.7
Less: Receivables not transferred	630.8		607.7
Net receivables transferred	$	—	$	—
Short-term debt due to asset securitization	$	—	$	—

For the three months ended March 31, 2021 and 2020, zero and $106.2 million, respectively, was recorded as cash flows from financing activities related to the change in short-term borrowings due to securitization transactions. Fees associated with the securitization transactions were $0.4 million and $0.7 million for the three months ended March 31, 2021 and 2020,

24

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

respectively. Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized, and the receivables cannot be transferred to another party.

12.    Goodwill

 The following presents our goodwill balance allocated by segment as of March 31, 2021:

(in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Goodwill	$	1,485.9	$	—	$	—	$	1,485.9

For our annual goodwill impairment analysis performed as of May 1, 2020, we completed a quantitative "step 1" fair value measurement of our reporting units with a goodwill balance. This analysis incorporated the latest available income statement and cash flow projections, including significant, identifiable impacts of COVID-19 on the operations of each of our goodwill reporting units. We also incorporated other significant inputs to our fair value calculations, including discount rate and market multiples, to reflect current market conditions. The step 1 analysis performed indicated that the fair value of each reporting unit that is allocated goodwill significantly exceeded its carrying value. As a result, no impairment charge was recorded as of the May 1, 2020 test date.

13.    Income Taxes

Our interim effective tax rates reflect the estimated annual effective tax rates for 2021 and 2020, adjusted for tax expense associated with certain discrete items. The effective tax rates for the three months ended March 31, 2021 and 2020 were 17.4% and (24.5)%, respectively. These effective tax rates differ from the federal statutory tax rate of 21% primarily due to increased amortization of excess deferred federal income tax liabilities, as specified in the TCJA, tax credits, state income taxes and other permanent book-to-tax differences. These adjustments have a relative impact on the effective tax rate proportionally to pretax income or loss.

The increase in the three month effective tax rate of 41.9% in 2021 compared to 2020 is primarily attributed to a discrete item related to the pre-tax book loss recorded for the classification as held for sale of the Massachusetts Business tax effected at statutory tax rates in 2020 offset by an increase in amortization of excess deferred federal income tax liabilities and deduction for AFUDC equity.

There were no material changes recorded in 2021 to our uncertain tax positions recorded as of December 31, 2020.

14.    Pension and Other Postretirement Benefits

We provide defined contribution plans and noncontributory defined benefit retirement plans that cover certain of our employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, we provide health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for us. The expected cost of such benefits is accrued during the employees’ years of service. We determined that, for certain rate-regulated subsidiaries, the future recovery of postretirement benefit costs is probable, and we record regulatory assets and liabilities for amounts that would otherwise have been recorded to expense or accumulated other comprehensive loss. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets and liabilities that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts.

For the three months ended March 31, 2021, we contributed $0.7 million to our pension plans and $5.1 million to our other postretirement benefit plans.

25

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

The following table provides the components of the plans’ actuarially determined net periodic benefit cost for the three months ended March 31, 2021 and 2020:

	Pension Benefits				Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2021		2020		2021		2020
Components of Net Periodic Benefit (Income) Cost(1)
Service cost	$	7.6	$	8.0	$	1.5	$	1.6
Interest cost	7.7		13.5		2.5		3.9
Expected return on assets	(25.8)		(28.4)		(3.8)		(3.6)
Amortization of prior service credit	—		0.2		(0.6)		(0.5)
Recognized actuarial loss	5.3		8.7		1.2		1.3
Settlement loss	3.3		—		—		—
Total Net Periodic Benefit (Income) Cost	$	(1.9)	$	2.0	$	0.8	$	2.7

(1)The service cost component and all non-service cost components of net periodic benefit (income) cost are presented in "Operation and maintenance" and "Other, net", respectively, on the Condensed Statements of Consolidated Income (unaudited).

During the first quarter of 2021, one of our qualified pension plans met the requirement for settlement accounting. A settlement charge of $3.3 million was recorded during the first quarter of 2021. As a result of the settlement, the pension plan was remeasured, resulting in a decrease to the net pension asset of $5.8 million, a net increase to regulatory assets of $2.1 million, and a net debit to accumulated other comprehensive loss of $0.4 million. Net periodic pension benefit cost for 2021 increased by $4.0 million as a result of the interim remeasurement.

The following table provides the key assumptions that were used to calculate the pension benefit obligation and the net periodic benefit cost at the interim remeasurement date for the plan that triggered settlement accounting:

	February 28, 2021
Weighted-average Assumption to Determine Benefit Obligation
Discount rate	2.57	%
Weighted-average Assumptions to Determine Net Periodic Benefit Costs for the period ended
Discount rate - service cost	2.81	%
Discount rate - interest cost	1.57	%
Expected return on assets	4.80	%

15.    Variable Interest Entities

A VIE is an entity in which the controlling interest is determined through means other than a majority voting interest. The primary beneficiary of a VIE is the business enterprise which has the power to direct the activities that most significantly impact the VIE’s economic performance. Also, the primary beneficiary either absorbs a significant amount of the VIE’s losses or has the right to receive benefits that could be significant to the VIE. We consider these qualitative elements in determining whether we are the primary beneficiary of a VIE, and we consolidate those VIEs for which we are determined to be the primary beneficiary.

Rosewater (a joint venture) owns and operates 102 MW of nameplate capacity wind generation assets. Members of the joint venture are NIPSCO (who is the managing member) and a tax equity partner. Earnings, tax attributes and cash flows are allocated to both NIPSCO and the tax equity partner in varying percentages by category and over the life of the partnership. Once the tax equity partner has earned their negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value from the tax equity partner the remaining interest in the aforementioned joint venture. NIPSCO has an obligation to purchase, through a PPA at established market rates, 100% of the electricity generated by Rosewater.

As the managing member of Rosewater, we control decisions that are significant to its ongoing operations and economic results. Therefore, we have concluded that we are the primary beneficiary of Rosewater and have consolidated Rosewater even though we own less than 100% of the total equity membership interest.

26

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

We have determined that the use of HLBV accounting is reasonable and appropriate in order to attribute income and loss to the noncontrolling interest held by the tax equity partner. HLBV accounting was selected as the allocation of Rosewater's economic results to members differ from the members' relative ownership percentages. Using the HLBV method, our earnings are calculated based on how the partnership would distribute its cash if it were to hypothetically sell all of its assets for their carrying amounts and liquidate at each reporting period. Under HLBV, we calculate the liquidation value allocable to each partner at the beginning and end of each period based on the contractual terms of the related entity's operating agreement and adjust our income for the period to reflect the change in our associated book value.

In March 2021, in exchange for additional respective membership interests in Rosewater, NIPSCO contributed $0.1 million in cash, and the tax equity partner contributed $7.5 million in cash, the second of two contractual cash contributions for each partner, per the equity capital contribution agreement. NIPSCO also assumed an additional obligation of $6.0 million to the developer, which comes due in 2023 and is included in "Other noncurrent liabilities" in the Condensed Consolidated Balance Sheets (unaudited). From the contributed funds, Rosewater paid $7.4 million to the developer of the wind generation assets. The developer of the facility is not a partner in the joint venture for federal income tax purposes and does not receive any share of earnings, tax attributes, or cash flows of Rosewater. With asset construction now complete, NIPSCO and the tax equity partner have made total cash contributions of $0.8 million and $93.6 million, respectively, and NIPSCO has assumed an obligation to the developer of $75.7 million, totaling contributions of $170.1 million for both partners. We did not provide any financial or other support during the year that was not previously contractually required, nor do we expect to provide such support in the future.

At March 31, 2021 and December 31, 2020, $170.0 million and $156.4 million, respectively, in net assets (as detailed in the table below) related to Rosewater and the non-controlling interest attributable to the unrelated tax equity partner of $94.1 million and $85.6 million, respectively, were included in the Condensed Consolidated Balance Sheets (unaudited). For the quarters ended March 31, 2021 and 2020, $1.0 million and zero were allocated to the tax equity partner and is included in "Net income attributable to non-controlling interest" on the Condensed Statements of Consolidated Income.

Our Condensed Consolidated Balance Sheets (unaudited) included the following assets and liabilities associated with Rosewater:

(in millions)	March 31, 2021		December 31, 2020
Net Property, Plant and Equipment	$	174.2	$	175.6
Current assets	4.2		1.7
Total assets(1)	$	178.4	$	177.3
Current liabilities	$	2.8	$	15.3
Asset retirement obligations	5.5		5.5
Other noncurrent liabilities	0.1		0.1
Total liabilities	$	8.4	$	20.9

(1)The assets of Rosewater represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE.

16.    Short-Term Borrowings

We generate short-term borrowings from our revolving credit facility, commercial paper program and accounts receivable transfer programs. Each of these borrowing sources is described further below.

We maintain a revolving credit facility to fund ongoing working capital requirements, including the provision of liquidity support for our commercial paper program, provide for issuance of letters of credit and also for general corporate purposes. Our revolving credit facility has a program limit of $1.85 billion and is comprised of a syndicate of banks led by Barclays. We had no outstanding borrowings under this facility as of March 31, 2021 and December 31, 2020.

Our commercial paper program has a program limit of up to $1.5 billion with a dealer group comprised of Barclays, Citigroup, Credit Suisse and Wells Fargo. We had $520.0 million of commercial paper outstanding as of March 31, 2021 and $503.0 million of commercial paper outstanding as of December 31, 2020.

Refer to Note 11, "Transfers of Financial Assets," for additional information on our accounts receivable transfer programs.

27

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Short-term borrowings were as follows: 

(in millions)	March 31, 2021		December 31, 2020
Commercial paper weighted-average interest rate of 0.19% and 0.27% at March 31, 2021 and December 31, 2020, respectively	520.0		503.0
Total Short-Term Borrowings	$	520.0	$	503.0

Items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited) as their maturities are less than 90 days.

17.    Other Commitments and Contingencies

A. Guarantees and Indemnities. We and certain of our subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries as a part of normal business. Such agreements include guarantees and stand-by letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiaries’ intended commercial purposes. As of March 31, 2021 and December 31, 2020, we had issued stand-by letters of credit of $15.2 million.

We provide guarantees related to our future performance under BTAs for our renewable generation projects. At March 31, 2021, our guarantees for the Rosewater and Indiana Crossroads BTAs totaled $34.0 million. The amount of each guaranty will fluctuate upon the completion of the various steps outlined in each BTA. See “- D. Other Matters - Generation Transition,” below for more information.

 B. Legal Proceedings. On September 13, 2018, a series of fires and explosions occurred in Lawrence, Andover and North Andover, Massachusetts related to the delivery of natural gas by Columbia of Massachusetts (the "Greater Lawrence Incident"). The Greater Lawrence Incident resulted in one fatality and a number of injuries, damaged multiple homes and businesses, and caused the temporary evacuation of significant portions of each municipality. The Massachusetts Governor’s Office declared a state of emergency, authorizing the Massachusetts DPU to order another utility company to coordinate the restoration of utility services in Lawrence, Andover and North Andover. The incident resulted in the interruption of gas for approximately 7,500 gas meters, the majority of which served residences and approximately 700 of which served businesses, and the interruption of other utility service more broadly in the area. Columbia of Massachusetts replaced the cast iron and bare steel gas pipeline system in the affected area and restored service. See “- D. Other Matters - Greater Lawrence Pipeline Replacement” below for more information. On September 1, 2020, the Massachusetts Governor terminated the state of emergency declared following the Greater Lawrence Incident.

We have been subject to inquiries and investigations by government authorities and regulatory agencies regarding the Greater Lawrence Incident, including the Massachusetts DPU and the Massachusetts Attorney General's Office. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney’s Office for the District of Massachusetts to resolve the U.S. Attorney’s Office’s investigation relating to the Greater Lawrence Incident, as described below. The Company and Columbia of Massachusetts entered into an agreement with the Massachusetts Attorney General’s Office (among other parties) to resolve the Massachusetts DPU and the Massachusetts Attorney General’s Office investigations, that was approved by the Massachusetts DPU on October 7, 2020 as part of the sale of the Massachusetts Business to Eversource.

NTSB Investigation. As previously disclosed, the NTSB concluded its investigation into the Greater Lawrence Incident. On November 24, 2020, the NTSB closed NiSource’s one remaining open safety recommendation.

U.S. Department of Justice Investigation. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney’s Office to resolve the U.S. Attorney’s Office’s investigation relating to the Greater Lawrence Incident. Columbia of Massachusetts agreed to plead guilty in the United States District Court for the District of Massachusetts (the “Court”) to violating the Natural Gas Pipeline Safety Act (the “Plea Agreement”), and the Company entered into a Deferred Prosecution Agreement (the “DPA”).

28

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

On March 9, 2020, Columbia of Massachusetts entered its guilty plea pursuant to the Plea Agreement, which the Court accepted. Subsequently, Columbia of Massachusetts and the U.S. Attorney’s Office modified the Plea Agreement. On June 23, 2020, the Court sentenced Columbia of Massachusetts in accordance with the terms of the modified Plea Agreement. Under the modified Plea Agreement, Columbia of Massachusetts is subject to the following terms, among others: (i) a criminal fine in the amount of $53,030,116, which has been paid; (ii) a three year probationary period that will terminate early upon a sale of Columbia of Massachusetts or a sale of its gas distribution business to a qualified third-party buyer consistent with certain requirements, but in no event before the end of the one-year mandatory period of probation; (iii) compliance with each of the NTSB recommendations stemming from the Greater Lawrence Incident; and (iv) employment of an in-house monitor until the end of the term of probation or until the sale of Columbia of Massachusetts or its gas distribution business, whichever is earlier. On October 13, 2020, the Court, upon agreement of the U.S. Attorney's Office and Columbia Gas of Massachusetts, modified the terms of probation by ending the term of the in-house monitor.

Under the DPA, the U.S. Attorney’s Office agreed to defer prosecution of the Company in connection with the Greater Lawrence Incident for a three-year period (which three-year period may be extended for twelve (12) months upon the U.S. Attorney’s Office’s determination of a breach of the DPA) subject to certain obligations of the Company, including, but not limited to, the following: (i) the Company will use reasonable best efforts to sell Columbia of Massachusetts or Columbia of Massachusetts’ gas distribution business to a qualified third-party buyer consistent with certain requirements, and, upon the completion of any such sale, the Company will cease and desist any and all gas pipeline and distribution activities in the District of Massachusetts; (ii) the Company will forfeit and pay, within 30 days of the later of the sale becoming final or the date on which post-closing adjustments to the purchase price are finally determined in accordance with the agreement to sell Columbia of Massachusetts or its gas distribution business, a fine equal to the total amount of the profit or gain, if any, from any sale of Columbia of Massachusetts or its gas distribution business, with the amount of profit or gain determined as provided in the DPA; and (iii) the Company agrees as to each of the Company’s subsidiaries involved in the distribution of gas through pipeline facilities in Massachusetts, Indiana, Ohio, Pennsylvania, Maryland, Kentucky and Virginia to implement and adhere to each of the recommendations from the NTSB stemming from the Greater Lawrence Incident. Pursuant to the DPA, if the Company complies with all of its obligations under the DPA, including, but not limited to those identified above, the U.S. Attorney’s Office will not file any criminal charges against the Company related to the Greater Lawrence Incident. If Columbia of Massachusetts withdraws its plea for any reason, if the Court rejects any aspect of the Plea Agreement, or if Columbia of Massachusetts should fail to perform an obligation under the Plea Agreement prior to the sale of Columbia of Massachusetts or its gas distribution business, the U.S. Attorney's Office may, at its sole option, render the DPA null and void. The sale of the Massachusetts Business was completed on October 9, 2020. The Company was not required to forfeit or pay any funds because the Company did not realize a profit or gain from the sale as provided in the DPA.

Private Actions. Various lawsuits, including several purported class action lawsuits, have been filed by various affected residents or businesses in Massachusetts state courts against the Company and/or Columbia of Massachusetts in connection with the Greater Lawrence Incident.

On July 26, 2019, the Company, Columbia of Massachusetts and NiSource Corporate Services Company, a subsidiary of the Company, entered into a term sheet with the class action plaintiffs under which they agreed to settle the class action claims in connection with the Greater Lawrence Incident. Columbia of Massachusetts agreed to pay $143 million into a settlement fund to compensate the settlement class and the settlement class agreed to release Columbia of Massachusetts and affiliates from all claims arising out of or related to the Greater Lawrence Incident. The following claims are not covered under the proposed settlement because they are not part of the consolidated class action: (1) physical bodily injury and wrongful death; (2) insurance subrogation, whether equitable, contractual or otherwise; and (3) claims arising out of appliances that are subject to the Massachusetts DPU orders. Emotional distress and similar claims are covered under the proposed settlement unless they are secondary to a physical bodily injury. The settlement class is defined under the term sheet as all persons and businesses in the three municipalities of Lawrence, Andover and North Andover, Massachusetts, subject to certain limited exceptions. The motion for preliminary approval and the settlement documents were filed on September 25, 2019. The preliminary approval court hearing was held on October 7, 2019 and the court issued an order granting preliminary approval of the settlement on October 11, 2019. The Court granted final approval of the settlement on March 12, 2020.

With respect to claims not included in the consolidated class action, many of the asserted wrongful death and bodily injury claims have settled, and we continue to discuss potential settlements with remaining claimants. The outcomes and impacts of such private actions are uncertain at this time.

Shareholder Derivative Lawsuit. On April 28, 2020, a shareholder derivative lawsuit was filed by the City of Detroit Police and Fire Retirement System in the United States District Court for the District of Delaware against certain of the Company’s

29

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

current and former directors, alleging state-law claims for breaches of fiduciary duty with respect to the pipeline safety management systems relating to the distribution of natural gas prior to the Greater Lawrence Incident and also including federal-law claims related to our proxy statement disclosures regarding our safety systems. The remedies sought included damages for the alleged breaches of fiduciary duty, corporate governance reforms, and restitution of any unjust enrichment. The defendants filed a motion to dismiss the lawsuit, and oral argument was held on March 2, 2021. On March 9, 2021, the district court granted the defendants’ motion to dismiss. It dismissed the federal-law claims with prejudice for failure to state a claim on which relief can be granted and declined to exercise jurisdiction over the state-law claims, which were dismissed without prejudice.

Following the dismissal of the federal court action, on April 29, 2021, the same plaintiff filed a shareholder derivative lawsuit in the Delaware Court of Chancery against certain of our current and former directors. The new complaint alleges a single count for breach of fiduciary duty, and no longer alleges disclosure violations or breaches of federal securities laws. The complaint relates to substantially the same matters as those alleged in the dismissed federal derivative complaint. The remedies sought include damages for the alleged breaches of fiduciary duty, corporate governance reforms, and restitution of compensation by the individual defendants. The case is at an early stage, and a schedule has not yet been entered. Because of the preliminary nature of this lawsuit, we are not able to estimate a loss or range of loss, if any, that may be incurred in connection with this matter at this time.

Financial Impact. Since the Greater Lawrence Incident, we have recorded expenses of approximately $1,040 million for third-party claims and fines, penalties and settlements associated with government investigations. These costs do not include the capital cost of the pipeline replacement. Refer to " - D. Other Matters - Greater Lawrence Incident Restoration," and "- Greater Lawrence Incident Pipeline Replacement," for additional information.

The process for estimating costs associated with third-party claims relating to the Greater Lawrence Incident requires management to exercise significant judgment based on a number of assumptions and subjective factors. As more information becomes known, management’s estimates and assumptions regarding the financial impact of the Greater Lawrence Incident may change.

We are also party to certain other claims, regulatory and legal proceedings arising in the ordinary course of business in each state in which we have operations, none of which we believe to be individually material at this time.

Due to the inherent uncertainty of litigation, there can be no assurance that the outcome or resolution of any particular claim, proceeding or investigation related to the Greater Lawrence Incident or otherwise would not have a material adverse effect on our results of operations, financial position or liquidity. Certain matters in connection with the Greater Lawrence Incident have had or may have a material impact as described above. If one or more of such additional or other matters were decided against us, the effects could be material to our results of operations in the period in which we would be required to record or adjust the related liability and could also be material to our cash flows in the periods that we would be required to pay such liability.

C. Environmental Matters. Our operations are subject to environmental statutes and regulations related to air quality, water quality, hazardous waste and solid waste. We believe that we are in substantial compliance with the environmental regulations currently applicable to our operations.

It is management's continued intent to address environmental issues in cooperation with regulatory authorities in such a manner as to achieve mutually acceptable compliance plans. However, there can be no assurance that fines and penalties will not be incurred. Management expects a majority of environmental assessment and remediation costs to be recoverable through rates for certain of our companies.

As of March 31, 2021 and December 31, 2020, we had recorded a liability of $90.6 million and $92.6 million, respectively, to cover environmental remediation at various sites. The current portion of this liability is included in "Other accruals" in the Condensed Consolidated Balance Sheets (unaudited). The noncurrent portion is included in "Other noncurrent liabilities." We recognize costs associated with environmental remediation obligations when the incurrence of such costs is probable and the amounts can be reasonably estimated. The original estimates for remediation activities may differ materially from the amount ultimately expended. The actual future expenditures depend on many factors, including laws and regulations, the nature and extent of impact and the method of remediation. These expenditures are not currently estimable at some sites. We periodically adjust our liability as information is collected and estimates become more refined.

30

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

CERCLA. Our subsidiaries are potentially responsible parties at waste disposal sites under the CERCLA (commonly known as Superfund) and similar state laws. Under CERCLA, each potentially responsible party can be held jointly, severally and strictly liable for the remediation costs as the EPA, or state, can allow the parties to pay for remedial action or perform remedial action themselves and request reimbursement from the potentially responsible parties. Our affiliates have retained CERCLA environmental liabilities, including remediation liabilities, associated with certain current and former operations. These liabilities are not material to the Condensed Consolidated Financial Statements (unaudited).

MGP. We maintain a program to identify and investigate former MGP sites where Gas Distribution Operations subsidiaries or predecessors may have liability. The program has identified 54 such sites where liability is probable. Remedial actions at many of these sites are being overseen by state or federal environmental agencies through consent agreements or voluntary remediation agreements.

We utilize a probabilistic model to estimate our future remediation costs related to MGP sites. The model was prepared with the assistance of a third party and incorporates our experience and general industry experience with remediating MGP sites. We complete an annual refresh of the model in the second quarter of each fiscal year. No material changes to the estimated future remediation costs were noted as a result of the refresh completed as of June 30, 2020. Our total estimated liability related to the facilities subject to remediation was $84.3 million and $85.0 million at March 31, 2021 and December 31, 2020, respectively. The liability represents our best estimate of the probable cost to remediate the MGP sites. We believe that it is reasonably possible that remediation costs could vary by as much as $20 million in addition to the costs noted above. Remediation costs are estimated based on the best available information, applicable remediation standards at the balance sheet date and experience with similar facilities.

CCRs. On April 17, 2015, the EPA issued a final rule for regulation of CCRs. The rule regulates CCRs under the RCRA Subtitle D, which determines them to be nonhazardous. The rule is implemented in phases and requires increased groundwater monitoring, reporting, recordkeeping and posting of related information to the Internet. The rule also establishes requirements related to CCR management and disposal. The rule allows NIPSCO to continue its byproduct beneficial use program.

To comply with the rule, NIPSCO completed capital expenditures in 2019 to modify its infrastructure and manage CCRs. The CCR rule also resulted in revisions to previously recorded legal obligations associated with the retirement of certain NIPSCO facilities. The actual asset retirement costs related to the CCR rule may vary substantially from the estimates used to record the increased asset retirement obligation due to the uncertainty about the requirements that will be established by environmental authorities, compliance strategies that will be used and the preliminary nature of available data used to estimate costs. As allowed by the rule, NIPSCO will continue to collect data over time to determine the specific compliance solutions and associated costs and, as a result, the actual costs may vary. NIPSCO will also continue to work with EPA and the Indiana Department of Environmental Management to obtain administrative approvals associated with the CCR rule. In the event that the approvals are not obtained, future operations could be impacted. We believe the possibility of such an outcome is remote.

D. Other Matters.

Generation Transition. NIPSCO has executed several PPAs to purchase 100% of the output from renewable generation facilities at a fixed price per MWh. Each facility supplying the energy will have an associated nameplate capacity, and payments under the PPAs will not begin until the associated generation facility is constructed by the owner/seller. NIPSCO has also executed several BTAs with developers to construct renewable generation facilities. NIPSCO's purchase requirement under the BTAs is dependent on satisfactory approval of the BTA by the IURC, successful execution of an agreement with a tax equity partner and timely completion of construction. NIPSCO and the tax equity partner are obligated to make cash contributions to the partnership at the date construction is substantially complete. Once the tax equity partner has earned their negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value from the tax equity partner the remaining interest in the aforementioned joint venture.

Greater Lawrence Incident Restoration. In addition to the amounts estimated for third-party claims and fines, penalties and settlements associated with government investigations described above, we have recorded expenses for other incident-related costs. Such costs include certain consulting costs, legal costs, vendor costs, claims center costs, labor and related expenses incurred in connection with the incident, and insurance-related loss surcharges. These costs were immaterial for the three months ended March 31, 2021.

Greater Lawrence Pipeline Replacement. In connection with the Greater Lawrence Incident, Columbia of Massachusetts, in cooperation with the Massachusetts Governor’s office, replaced the entire affected pipeline system. We invested approximately $258 million of capital spend for the pipeline replacement; this work was completed in 2019. We maintain property insurance

31

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

for gas pipelines and other applicable property. Columbia of Massachusetts has filed a proof of loss with its property insurer for the pipeline replacement. In January 2020, we filed a lawsuit against the property insurer, seeking payment of our property claim. We are currently unable to predict the timing or amount of any insurance recovery under the property policy.

State Income Taxes Related to Greater Lawrence Incident Expenses. As of December 31, 2018, expenses related to the Greater Lawrence Incident were $1,023 million. In the fourth quarter of 2019, we filed an application for Alternative Apportionment with the MA DOR to request an allocable approach to these expenses for purposes of Massachusetts state income taxes, which, if approved, would result in a state deferred tax asset of approximately $50 million, net. The MA DOR issued a denial during the first quarter of 2020. We filed an application for abatement in the second quarter of 2020, which resulted in a denial from the MA DOR in April 2021. We have 60 days to submit an appeal for this decision.

One-Time Employee Separation Benefits. On August 5, 2020, we commenced a voluntary separation program for certain employees. Expense for the voluntary separation program was predominantly recognized in the third quarter of 2020, when the employees accepted the offer, absent a retention period. In addition, we have continued to evaluate our organizational structure under the auspices of NiSource Next, which has resulted in additional separations under our existing severance policies. For employees that have a retention period, expense will be recognized over the remaining service period. The total estimated severance expense for employees is approximately $40 million, with $38.1 million incurred to date. A rollforward of the one-time employee separation benefits accrual for the three months ended March 31, 2021 is presented below:

(in millions)	Balance as of January 1, 2021	Changes Attributable to Costs Incurred(1)	Costs Paid	Adjustments	Balance as of March 31, 2021(2)
One-time Employee Separation Benefits	11.1	4.6	(8.4)	—	7.3

(1)This activity is presented within "Operation and maintenance" in our Condensed Statements of Consolidated Income (unaudited).

(2)This activity is presented within "Accrued compensation and employee benefits" in our Condensed Consolidated Balance Sheets (unaudited).

18.    Accumulated Other Comprehensive Loss

The following tables display the components of Accumulated Other Comprehensive Loss:

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2021	$	6.0	$	(147.9)	$	(14.8)	$	(156.7)
Other comprehensive income (loss) before reclassifications	(2.2)		84.6		(1.4)		81.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)		—		0.5		0.2
Net current-period other comprehensive income (loss)	(2.5)		84.6		(0.9)		81.2
Balance as of March 31, 2021	$	3.5	$	(63.3)	$	(15.7)	$	(75.5)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2020	$	3.3	$	(77.2)	$	(18.7)	$	(92.6)
Other comprehensive income (loss) before reclassifications	(5.2)		(133.3)		0.4		(138.1)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		—		0.3		0.1
Net current-period other comprehensive income (loss)	(5.4)		(133.3)		0.7		(138.0)
Balance as of March 31, 2020	$	(2.1)	$	(210.5)	$	(18.0)	$	(230.6)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

32

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

19.    Other, Net

Three Months Ended March 31, (in millions)	2021		2020
Interest income	$	0.9	$	1.7
AFUDC equity	1.5		1.7
Pension and other postretirement non-service benefit	8.5		2.7
Miscellaneous	(0.4)		(0.7)
Total Other, net	$	10.5	$	5.4

20.    Business Segment Information

At March 31, 2021, our operations are divided into two primary reportable segments, the Gas Distribution Operations and Electric Operations segments. Corporate costs and other activities that are not significant on a stand-alone basis to warrant treatment as an operating segment and that do not fit into one of our two segments are aggregated as "Corporate and Other" in the disclosures below. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues.

The following table provides information about our business segments. We use operating income as our primary measurement for each of the reported segments and make decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.

	Three Months Ended March 31,
(in millions)	2021		2020
Operating Revenues
Gas Distribution Operations
Unaffiliated	$	1,135.8	$	1,228.0
Intersegment	3.1		3.0
Total	1,138.9		1,231.0
Electric Operations
Unaffiliated	402.5		377.3
Intersegment	0.2		0.2
Total	402.7		377.5
Corporate and Other
Unaffiliated	7.3		0.2
Intersegment	103.9		106.7
Total	111.2		106.9
Eliminations	(107.2)		(109.9)
Consolidated Operating Revenues	$	1,545.6	$	1,605.5
Operating Income (Loss)
Gas Distribution Operations	$	346.9	$	78.5
Electric Operations	87.9		78.5
Corporate and Other	(1.6)		(8.8)
Consolidated Operating Income	$	433.2	$	148.2

33

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

21.    Subsequent Event

On April 19, 2021, we completed the sale of 8.625 million Series A Equity Units (“Equity Units”), initially consisting of Series A Corporate Units (“Corporate Units”), each with a stated amount of $100. The offering generated net proceeds of $835.5 million, after underwriting and estimated issuance expenses. Each Corporate Unit consists of a forward contract to purchase shares of our common stock in the future and a 1/10th, or 10%, undivided beneficial ownership interest in one share of Series C Mandatory Convertible Preferred Stock, par value $0.01 per share, with a liquidation preference of $1,000 per share. The Mandatory Convertible Preferred Stock initially will not bear any dividends. Total annual distributions of the Corporate Units will be 7.75%, consisting of quarterly contract adjustment payments under the forward contract. We may pay the contract adjustment payments in cash, shares of common stock or a combination of cash and shares of common stock, at our election.

34

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

NiSource Inc.

Index	Page
Executive Summary	36
Summary of Consolidated Financial Results	37
Results and Discussion of Segment Operations	38
Gas Distribution Operations	39
Electric Operations	42
Liquidity and Capital Resources	45
Regulatory and Other Matters	48
Off-Balance Sheet Arrangements	50
Market Risk Disclosures	50
Other Information	51

35

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

EXECUTIVE SUMMARY

This Management’s Discussion and Analysis of Financial Condition and Results of Operations ("Management’s Discussion") includes management’s analysis of past financial results and certain potential factors that may affect future results, potential future risks and approaches that may be used to manage those risks. See "Note regarding forward-looking statements" at the beginning of this report for a list of factors that may cause results to differ materially.

Management’s Discussion is designed to provide an understanding of our operations and financial performance and should be read in conjunction with our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

We are an energy holding company under the Public Utility Holding Company Act of 2005 whose subsidiaries are fully regulated natural gas and electric utility companies serving customers in six states. We generate substantially all of our operating income through these rate-regulated businesses, which are summarized for financial reporting purposes into two primary reportable segments: Gas Distribution Operations and Electric Operations.

Refer to the “Business” section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 for further discussion of our regulated utility business segments.

Our goal is to develop strategies that benefit all stakeholders as we (i) address changing customer conservation patterns, (ii) align our price structure with our cost structure, and (iii) embark on long-term infrastructure investment and safety programs to better serve our customers. These strategies focus on improving safety and reliability, enhancing customer service, lowering customer bills and reducing emissions while generating sustainable returns. The safety of our customers, communities and employees remains our top priority. The SMS is an established operating model within NiSource. With the continued support and advice from our Quality Review Board (a panel of third parties with safety operations expertise engaged by management to advise on safety matters), we are continuing to mature our SMS processes, capabilities and talent as we collaborate within and across industries to enhance safety and reduce operational risk. Additionally, we continue to pursue regulatory and legislative initiatives that will allow residential customers not currently on our system to obtain gas service in a cost effective manner.

Your Energy, Your Future: Our plan to replace all of our coal generation capacity by the end of 2028 with primarily renewable resources is well underway. In March 2021, we executed three BTAs for 650 MW solar nameplate capacity and a PPA for 200 MW of wind nameplate capacity. The four projects were selected following a comprehensive review of bids submitted through the RFP process that NIPSCO underwent in late 2019. The projects complement previously executed BTAs and PPAs with a combined nameplate capacity of 1,300 MW and 1,180 MW, respectively. NIPSCO will refresh its 2018 Integrated Resource Plan in 2021. For additional information, see "Results and Discussion of Segment Operation - Electric Operations," in this Management's Discussion.

NiSource Next: We have launched a comprehensive, multi-year program designed to deliver long-term safety, sustainable capability enhancements and cost optimization improvements. This program will advance the high priority we place on safety and risk mitigation, further enable our safety management system, and enhance the customer experience. NiSource Next is designed to (i) leverage our current scale, (ii) utilize technology, (iii) define clear roles and accountability with our leaders and employees, and (iv) standardize our processes to focus on operational rigor, quality management and continuous improvement. In the second quarter of 2021, we began to implement enhanced digital tools associated with our customer experience.

COVID-19: The safety of our employees and customers, while providing essential services during the COVID-19 pandemic, is paramount. We continue to take a proactive, coordinated approach intended to prevent, mitigate and respond to COVID-19 by utilizing our Incident Command System (ICS). The ICS includes members of our executive council, a medical review professional, and members of functional teams from across our company. The ICS monitors state-by-state conditions and determines steps to conduct our operations safely for employees and customers.

We have implemented procedures designed to protect our employees who work in the field and who continue to work in operational and corporate facilities, including social distancing, wearing face coverings, temperature checks and more frequent cleaning of equipment and facilities. We have also implemented work-from-home policies and practices. We continue to limit company vehicle occupancy to one person, where possible, and minimize non-essential work that requires an employee to enter a customer premise when infection rates spike in a county and local agencies elevate risk levels. As local circumstances permit, we are beginning previously delayed work that requires customer interaction. We continue to employ physical and cybersecurity measures to ensure that our operational and support systems remain functional. Our actions to date have mitigated the spread of COVID-19 amongst our employees and principal field contractors. We are also continuously evaluating changes

36

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

to CDC guidance, and updating our safety measures accordingly, in order to ensure employee and customer safety during this pandemic. We are following all federal, state, and local guidelines related to the COVID-19 vaccinations and are encouraging employees to receive the vaccine when it is available to them.

Since the beginning of the COVID-19 pandemic, we have been helping our customers navigate this challenging time. We suspended disconnections soon after this outbreak began. While the suspension of disconnections has been lifted in most states, suspensions are likely to continue in others. We plan to continue our payment assistance programs and customer education and awareness of energy assistance programs such as the Low Income Home Energy Assistance Program (LIHEAP) to help customers deal with the impact of the pandemic. Regulatory deferrals for certain costs have been allowed by all of our state regulatory commissions. Costs approved for deferral vary by state. For information on the state specific suspension of disconnections and COVID-19 regulatory filings, see Note 8, "Regulatory Matters," in the Notes to Condensed Consolidated Financial Statements (unaudited).

We continue to monitor how COVID-19 is affecting our workforce, customers, suppliers, operations, financial results and cash flow. The extent of the impact in the future will vary and depend on the duration and severity of the impact on the global, national and local economies. See Note 3, “Revenue Recognition” and Note 8, “Regulatory Matters” for impacts of COVID-19 for the three months ended March 31, 2021.

Summary of Consolidated Financial Results

A summary of our consolidated financial results for the three months ended March 31, 2021 and 2020 are presented below:

	Three Months Ended March 31,
(in millions, except per share amounts)	2021		2020		2021 vs. 2020
Operating Revenues	$	1,545.6	$	1,605.5	$	(59.9)
Operating Expenses
Cost of energy	476.8		462.4		14.4
Other Operating Expenses	635.6		994.9		(359.3)
Total Operating Expenses	1,112.4		1,457.3		(344.9)
Operating Income	433.2		148.2		285.0
Total Other Deductions, net	(74.1)		(87.5)		13.4
Income Taxes	62.6		(14.9)		77.5
Net Income	296.5		75.6		220.9
Net income attributable to noncontrolling interest	1.0		—		1.0
Net Income attributable to NiSource	295.5		75.6		219.9
Preferred dividends	(13.8)		(13.8)		—
Net Income Available to Common Shareholders	281.7		61.8		219.9
Earnings Per Share
Basic Earnings Per Share	$	0.72	$	0.16	$	0.56
Diluted Earnings Per Share	$	0.72	$	0.16	$	0.56
Basic Average Common Shares Outstanding	392.7		383.1		9.6
Diluted Average Common Shares	393.9		384.1		9.8

The majority of the cost of energy in both segments are tracked costs that are passed through directly to the customer, resulting in an equal and offsetting amount reflected in operating revenues.

On a consolidated basis, we reported a net income available to common shareholders of $281.7 million, or $0.72 per diluted share for the three months ended March 31, 2021, compared to a net income available to common shareholders of $61.8 million, or $0.16 per diluted share for the same period in 2020. The increase in income was primarily due to the loss on sale of the Massachusetts business in 2020, as well as lower operating expenses offset by lower operating revenues due to the sale of the Massachusetts business. Additionally, the increase in income was driven by revenue increases from new rates and the effects of colder weather in 2021 compared to 2020 partially offset by higher income taxes in 2021 compared to 2020 (See "Income Taxes" below). For additional information on operating income variance drivers see "Results and Discussion of Segment Operation" for Gas and Electric Operations in this Management's Discussion.

37

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Other Deductions, net

Other deductions, net reduced income by $74.1 million in the first quarter of 2021 compared to a reduction in income of $87.5 million in the prior year. This change was primarily driven by lower short term debt interest due to lower balances and a lower rate on commercial paper in 2021 compared to 2020. See Note 16, "Short-Term Borrowings," in the Notes to the Condensed Consolidated Financial Statements (unaudited) for additional information.

Income Taxes

Refer to Note 13, "Income Taxes," in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on income taxes and the change in the effective tax rate.

RESULTS AND DISCUSSION OF SEGMENT OPERATIONS

Presentation of Segment Information

Our operations are divided into two primary reportable segments: Gas Distribution Operations and Electric Operations. We primarily evaluate segment results based on operating income. The remainder of our operations, which are not significant enough on a stand-alone basis to warrant treatment as an operating segment, are presented as "Corporate and Other" within the Notes to the Condensed Consolidated Financial Statements (unaudited) and primarily are comprised of interest expense on holding company debt, and unallocated corporate costs and activities.

38

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Gas Distribution Operations

Financial and operational data for the Gas Distribution Operations segment for the three months ended March 31, 2021 and 2020 are presented below:

	Three Months Ended March 31,
(in millions)	2021			2020			2021 vs. 2020
Operating Revenues	$	1,138.9		$	1,231.0		$	(92.1)
Operating Expenses
Cost of energy	379.0			377.4			1.6
Operation and maintenance	248.8			330.1			(81.3)
Depreciation and amortization	92.9			96.5			(3.6)
Loss on sale of fixed assets and impairments, net	8.1			280.2			(272.1)
Other taxes	63.2			68.3			(5.1)
Total Operating Expenses	792.0			1,152.5			(360.5)
Operating Income	$	346.9		$	78.5		$	268.4
Revenues
Residential	$	782.3		$	823.3		$	(41.0)
Commercial	272.9			274.0			(1.1)
Industrial	58.2			74.5			(16.3)
Off-System	14.4			18.7			(4.3)
Other	11.1			40.5			(29.4)
Total	$	1,138.9		$	1,231.0		$	(92.1)
Sales and Transportation (MMDth)
Residential	118.4			118.5			(0.1)
Commercial	74.3			73.7			0.6
Industrial	136.4			146.8			(10.4)
Off-System	5.4			11.2			(5.8)
Other	0.2			0.2			—
Total	334.7			350.4			(15.7)
Heating Degree Days	2,703			2,440			263
Normal Heating Degree Days	2,854			2,897			(43)
% Colder (Warmer) than Normal	(5)		%	(16)		%
Gas Distribution Customers
Residential	2,965,004			3,233,222			(268,218)
Commercial	254,188			283,579			(29,391)
Industrial	4,965			6,002			(1,037)
Other	3			3			—
Total	3,224,160			3,522,806			(298,646)

Cost of energy for the Gas Distribution Operations segment is principally comprised of the cost of natural gas used while providing transportation and distribution services to customers. These are tracked costs that are passed through directly to the customer, resulting in an equal and offsetting amount reflected in operating revenue. In addition, comparability of operation and maintenance expenses, depreciation and amortization, and other taxes may be impacted by regulatory, depreciation and tax trackers that allow for the recovery in rates of certain costs. Therefore, increases in these tracked operating expenses are offset by increases in operating revenues and have essentially no impact on net income.

39

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Gas Distribution Operations

Three Months Ended March 31, 2021 vs. March 31, 2020 Operating Income

For the three months ended March 31, 2021, Gas Distribution Operations reported operating income of $346.9 million, an increase of $268.4 million from the comparable 2020 period.

Operating revenues for the three months ended March 31, 2021 were $1,138.9 million, a decrease of $92.1 million from the same period in 2020.

Changes in Operating Revenues (in millions)	Favorable (Unfavorable)
Revenues associated with the Massachusetts Business in 2020	$	(122.3)
New rates from base rate proceedings, infrastructure replacement programs and Columbia of Ohio's CEP	38.0
The effects of colder weather in 2021 compared to 2020	15.6
The effects of customer growth	3.4
Other	(2.1)
Change in operating revenues (before cost of energy and other tracked items)	$	(67.4)
Operating revenues offset in operating expense
Higher cost of energy billed to customers	81.3
Cost of energy associated with the Massachusetts Business in 2020	(79.7)
Operation and maintenance trackers associated with the Massachusetts Business in 2020	(24.3)
Lower operation and maintenance, depreciation, and tax trackers	(2.0)
Total change in operating revenues	$	(92.1)

Operating expenses were $360.5 million lower for the three months ended March 31, 2021 compared to the same period in 2020.

Changes in Operating Expenses (in millions)	Favorable (Unfavorable)
Loss on sale of the Massachusetts Business of $6.9 million in 2021 compared to $280.2 million in 2020	$	273.3
Operating expenses associated with the Massachusetts Business in 2020	65.6
Lower employee and administrative expenses	4.9
Severance and outside services expense related to NiSource Next initiative	(5.9)
Higher depreciation and amortization expense primarily due to higher capital expenditures placed in service	(5.8)
Other	3.7
Change in operating expenses (before cost of energy and other tracked items)	$	335.8
Operating expenses offset in operating revenue
Higher cost of energy billed to customers	(81.3)
Cost of energy associated with the Massachusetts Business in 2020	79.7
Operation and maintenance trackers associated with the Massachusetts Business in 2020	24.3
Lower operation and maintenance, depreciation, and tax trackers	2.0
Total change in operating expense	$	360.5

Weather

In general, we calculate the weather-related revenue variance based on changing customer demand driven by weather variance from normal heating degree days, net of weather normalization mechanisms. Our composite heating degree days reported do not directly correlate to the weather-related dollar impact on the results of Gas Distribution Operations. Heating degree days experienced during different times of the year or in different operating locations may have more or less impact on volume and dollars depending on when and where they occur. When the detailed results are combined for reporting, there may be weather-

40

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Gas Distribution Operations

related dollar impacts on operations when there is not an apparent or significant change in our aggregated composite heating degree day comparison.

Weather in the Gas Distribution Operations service territories for the first quarter of 2021 was about 5% warmer than normal and about 11% colder than 2020, leading to increased operating revenues of $16.4 million for the quarter ended March 31, 2021 compared to the same period in 2020.

Throughput

Total volumes sold and transported for the three months ended March 31, 2021 were 334.7 MMDth, compared to 350.4 MMDth for the same period in 2020. This decrease is primarily attributable to the sale of the Massachusetts Business, offset by the effects of colder weather in 2021 compared to 2020.

Commodity Price Impact

All of our Gas Distribution Operations companies have state-approved recovery mechanisms that provide a means for full recovery of prudently incurred gas costs. Gas costs are treated as pass-through costs and have no impact on operating income recorded in the period. The gas costs included in revenues are matched with the gas cost expense recorded in the period and the difference is recorded on the Condensed Consolidated Balance Sheets (unaudited) as under-recovered or over-recovered gas cost to be included in future customer billings.

Certain Gas Distribution Operations companies continue to offer choice opportunities, where customers can choose to purchase gas from a third-party supplier, through regulatory initiatives in their respective jurisdictions. These programs serve to further reduce our exposure to gas prices.

Columbia of Massachusetts Asset Sale

On October 9, 2020, we completed the sale of our Massachusetts Business. In March 2021, we reached an agreement with Eversource regarding the final purchase price, including net working capital adjustments, which resulted in a pre-tax loss for the three months ended March 31, 2021 of $6.9 million. The total loss on the sale as of March 31, 2021 is $419.3 million based on asset and liability balances as of the close of the transaction on October 9, 2020, transaction costs and the final purchase price. The pre-tax loss is presented as "Loss on sale of assets, net" on the Condensed Statements of Consolidated Income (unaudited).

41

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Electric Operations

Financial and operational data for the Electric Operations segment for the three months ended March 31, 2021 and 2020 are presented below:

	Three Months Ended March 31,
(in millions)	2021		2020		2021 vs. 2020
Operating Revenues	402.7		$	377.5	25.2
Operating Expenses
Cost of energy	97.8		85.0		12.8
Operation and maintenance	119.1		120.9		(1.8)
Depreciation and amortization	83.4		78.9		4.5
Other taxes	14.5		14.2		0.3
Total Operating Expenses	314.8		299.0		15.8
Operating Income	$	87.9	$	78.5	$	9.4
Revenues
Residential	$	129.2	$	119.2	$	10.0
Commercial	122.9		120.2		2.7
Industrial	123.1		109.1		14.0
Wholesale	3.4		3.2		0.2
Other	24.1		25.8		(1.7)
Total	$	402.7	$	377.5	$	25.2
Sales (Gigawatt Hours)
Residential	804.6		755.5		49.1
Commercial	867.9		878.7		(10.8)
Industrial	2,063.3		2,071.1		(7.8)
Wholesale	32.1		71.4		(39.3)
Other	27.3		28.2		(0.9)
Total	3,795.2		3,804.9		(9.7)
Electric Customers
Residential	419,582		416,501		3,081
Commercial	57,538		57,150		388
Industrial	2,156		2,160		(4)
Wholesale	720		725		(5)
Other	2		2		—
Total	479,998		476,538		3,460

Cost of energy for the Electric Operations segment is principally comprised of the cost of coal, related handling costs, natural gas purchased for internal generation of electricity at NIPSCO, and the cost of power purchased from third-party generators of electricity. The majority of these are tracked costs that are passed through directly to the customer resulting in an equal and offsetting amount reflected in operating revenue. In addition, comparability of operation and maintenance expenses and depreciation and amortization may be impacted by regulatory and depreciation trackers that allow for the recovery in rates of certain costs. Therefore, increases in these tracked operating expenses are offset by increases in operating revenues and have essentially no impact on net income.

42

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Electric Operations

Three Months Ended March 31, 2021 vs. March 31, 2020 Operating Income

For the three months ended March 31, 2021, Electric Operations reported operating income of $87.9 million, an increase of $9.4 million from the comparable 2020 period.

Operating revenues for the three months ended March 31, 2021 were $402.7 million, an increase of $25.2 million from the same period in 2020.

Changes in Operating Revenues (in millions)	Favorable (Unfavorable)
Increased customer usage, primarily driven by residential customers	$	4.8
New rates from infrastructure improvement and DSM programs	2.8
The effects of customer growth	1.0
Other	1.4
Change in operating revenues (before cost of energy and other tracked items)	$	10.0
Operating revenues offset in operating expense
Higher cost of energy billed to customers	12.8
Higher operation and maintenance and depreciation trackers	2.4
Total change in operating revenues	$	25.2

Operating expenses were $15.8 million higher for the three months ended March 31, 2021 compared to the same period in 2020.

Changes in Operating Expenses (in millions)	Favorable (Unfavorable)
Higher generation-related maintenance	$	(4.2)
Increased depreciation primarily due to additional plant placed in service	(3.4)
Severance and outside services expenses related to the NiSource Next initiative	(2.3)
Decreased environmental costs	6.8
Lower employee and administrative costs	4.3
Other	(1.8)
Change in operating expenses (before cost of energy and other tracked items)	$	(0.6)
Operating expenses offset in operating revenue
Higher cost of energy billed to customers	(12.8)
Higher operation and maintenance and depreciation trackers	(2.4)
Total change in operating expense	$	(15.8)

Weather

In general, we calculate the weather-related revenue variance based on changing customer demand driven by weather variance from normal heating or cooling degree days. Our composite heating or cooling degree days reported do not directly correlate to the weather-related dollar impact on the results of Electric Operations. Heating or cooling degree days experienced during different times of the year may have more or less impact on volume and dollars depending on when they occur. When the detailed results are combined for reporting, there may be weather-related dollar impacts on operations when there is not an apparent or significant change in our aggregated composite heating or cooling degree day comparison.

Weather in the Electric Operations’ territories for the first quarter of 2021 was about 3% warmer than normal and about 7% cooler than in 2020, which had an immaterial impact on operating revenues for the quarter ended March 31, 2021 compared to the same period in 2020.

43

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Electric Operations

Sales

Electric Operations sales for the first quarter of 2021 were 3,795.2 GWh, an immaterial decrease compared to the same period in 2020.

Commodity Price Impact

NIPSCO has a state-approved recovery mechanism that provides a means for full recovery of prudently incurred fuel costs. Fuel costs are treated as pass-through costs and have no impact on operating revenues recorded in the period. The fuel costs included in revenues are matched with the fuel cost expense recorded in the period and the difference is recorded on the Condensed Consolidated Balance Sheets (unaudited) as under-recovered or over-recovered fuel cost to be included in future customer billings.

Electric Supply and Generation Transition

NIPSCO continues to execute on an electric generation transition consistent with the preferred pathway from its 2018 Integrated Resource Plan, which outlines plans to retire all of its remaining coal-fired generation by 2028, to be replaced by lower-cost, reliable and cleaner options. The plan is expected to be a key element of a 90% reduction in NiSource's greenhouse gas emissions by 2030 compared with 2005 levels, and to save NIPSCO electric customers more than $4 billion over 30 years. We expect to have incremental capital investment requirements of approximately $2.0 billion, primarily in 2022 and 2023. On March 11, 2021, NIPSCO submitted modified Attachment Y Notices to MISO requesting an updated retirement date for coal-fired units 14 and 15. These units are now expected to be retired by the end of 2021, with the station's remaining two units still on track to be retired by 2023. Refer to Note 7, "Property, Plant and Equipment" and Note 17-D, "Other Matters," in the Notes to Condensed Consolidated Financial Statements (unaudited) for further information.

The current replacement plan includes renewable sources of energy, including wind, solar, and battery storage to be obtained through a combination of NIPSCO ownership and PPAs. NIPSCO has executed several PPAs to purchase 100% of the output from renewable generation facilities at a fixed price per MWh. Each facility supplying the energy will have an associated nameplate capacity, and payments under the PPAs will not begin until the associated generation facility is constructed by the owner/seller. NIPSCO has also executed several BTAs with developers to construct renewable generation facilities.

The following table summarizes the executed PPAs and BTAs from our generation transition:

Project Name	Transaction Type	Technology	Nameplate Capacity (MW)	Storage Capacity (MW)	Submitted to IURC	IURC Approval	Estimated Construction Completion
Jordan Creek	20 year PPA	Wind	400	—	02/01/2019	6/05/2019	In Service (12/10/2020)
Rosewater(1)	BTA	Wind	100	—	02/01/2019	8/07/2019	In Service (12/29/2020)
Indiana Crossroads(2)	BTA	Wind	300	—	10/22/2019	2/19/2020	Q4 2021
Greensboro	20 year PPA	Solar & Storage	100	30	7/17/2020	1/27/2021	Q4 2022
Brickyard	20 year PPA	Solar	200	—	7/17/2020	1/27/2021	Q4 2022
Cavalry(2)	BTA	Solar & Storage	200	60	11/30/2020	5/5/2021	Q4 2023
Dunn's Bridge I(2)	BTA	Solar	265	—	11/30/2020	5/5/2021	Q4 2022
Dunn's Bridge II(2)	BTA	Solar & Storage	435	75	11/30/2020	5/5/2021	Q4 2023
Green River	20 year PPA	Solar	200	—	12/23/2020	5/5/2021	Q2 2023
Gibson	22 year PPA	Solar	280	—	01/29/2021	Pending	Q2 2023
Fairbanks(2)	BTA	Solar	250	—	03/03/2021	Pending	Q3 2023
Indiana Crossroads(2)	BTA	Solar	200	—	03/19/2021	Pending	Q4 2022
Elliot(2)	BTA	Solar	200	—	03/31/2021	Pending	Q2 2023
Indiana Crossroads II	15 year PPA	Wind	200	—	04/30/2021	Pending	Q4 2023

(1) Refer to Note 15, "Variable Interest Entities," for additional information.

(2) Ownership of the facility will be transferred to joint ventures whose members include NIPSCO and an unrelated tax equity partner.

44

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Liquidity and Capital Resources

We continually evaluate the availability of adequate financing to fund our ongoing business operations, working capital and core safety and infrastructure investment programs. Our financing is sourced through cash flow from operations and the issuance of debt and/or equity. External debt financing is provided primarily through the issuance of long-term debt, accounts receivable securitization programs and our $1.5 billion commercial paper program, which is backstopped by our committed revolving credit facility with a total availability from third-party lenders of $1.85 billion. The commercial paper program and credit facility provide cost-effective, short-term financing until it can be replaced with a balance of long-term debt and equity financing that achieves our desired capital structure. We utilize an ATM equity program that allows us to issue and sell shares of our common stock up to an aggregate issuance of $750.0 million through December 31, 2023. On April 19, 2021, we completed the sale of 8.625 million Equity Units, which provided net proceeds of $835.5 million, after underwriting and estimated issuance expenses. We intend to use the net proceeds from the offering for renewable generation investments and general corporate purposes, including additions to working capital and repayment of existing indebtedness.

We believe these sources provide adequate capital to fund our operating activities and capital expenditures in 2021 and beyond.

Greater Lawrence Incident: As discussed in Note 17, “Other Commitments and Contingencies,” in the Notes to the Condensed Consolidated Financial Statements (unaudited), due to the inherent uncertainty of litigation, there can be no assurance that the outcome or resolution of any particular claim related to the Greater Lawrence Incident will not continue to have an adverse impact on our cash flows. Through income generated from operating activities, amounts available under the short-term revolving credit facility, and our ability to access capital markets, we believe we have adequate capital available to settle remaining anticipated claims associated with the Greater Lawrence Incident.

Operating Activities

Net cash from operating activities for the three months ended March 31, 2021 was $448.3 million, an increase of $78.4 million compared to the three months ended March 31, 2020. This increase was primarily driven by a year over year decrease in net payments related to the Greater Lawrence Incident. During 2021, we paid approximately $6 million compared to $150 million of payments during the same period in 2020. Additionally, we had decreased compensation and employee benefit payments in 2021 compared to 2020. Offsetting these decreased cash outflows are increases related to the under collection of gas and fuel costs.

Investing Activities

Net cash used for investing activities for the three months ended March 31, 2021 was $401.8 million, a decrease of $82.8 million compared to the three months ended March 31, 2020. This decrease was driven by lower capital expenditures associated with the Massachusetts Business in 2020 and timing of growth spend. We project total 2021 capital expenditures to be approximately $1.9 to $2.1 billion.

45

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Regulatory Capital Improvement Programs. In 2021, we continue to move forward on core infrastructure and environmental investment programs supported by complementary regulatory and customer initiatives across all six states of our operating area.

The following table describes the most recent vintage of our regulatory programs to recover infrastructure replacement and other federally mandated compliance investments currently in rates and those pending commission approval:

(in millions)
Company	Program	Incremental Revenue	Incremental Capital Investment	Investment Period	Costs Covered(1)	Rates Effective
Columbia of Ohio	IRP - 2021	22.2	212.6	1/20-12/20	Replacement of (1) hazardous service lines, (2) cast iron, wrought iron, uncoated steel, and bare steel pipe, (3) natural gas risers prone to failure and (4) installation of AMR devices.	May 2021
Columbia of Ohio	CEP - 2021	18.3	179.2	1/20-12/20	Assets not included in the IRP.	September 2021
NIPSCO - Gas	TDSIC 2	1.8	52.3	7/20-12/20	New or replacement projects undertaken for the purpose of safety, reliability, system modernization or economic development.	July 2021
NIPSCO - Gas	FMCA 5	1.4	42.3	4/20-9/20	Project costs to comply with federal mandates.	April 2021
Columbia of Pennsylvania(2)	DSIC - Q4 2020	0.8	25.0	9/20-11/20	Eligible project costs including piping, couplings, gas service lines, excess flow valves, risers, meter bars, meters, and other related capitalized cost, to improve the distribution system.	January 2021
Columbia of Virginia	SAVE - 2021	5.2	46.4	1/21-12/21	Replacement projects that (1) enhance system safety or reliability, or (2) reduce, or potentially reduce, greenhouse gas emissions.	January 2021
Columbia of Kentucky	SMRP - 2021	2.6	40.0	1/21-12/21	Replacement of mains and inclusion of system safety investments.	May 2021
Columbia of Maryland	STRIDE - 2021	1.3	16.9	1/21-12/21	Pipeline upgrades designed to improve public safety or infrastructure reliability.	January 2021
NIPSCO - Electric(3)(4)	TDSIC - 8	(2.0)	73.5	8/20-1/21	New or replacement projects undertaken for the purpose of safety, reliability, system modernization or economic development.	August 2021
NIPSCO - Electric(5)	FMCA - 13	(1.2)	—	9/19-2/20	Project costs to comply with federal mandates.	August 2020

(1)Programs do not include any costs already included in base rates.

(2)Effective January 23, 2021, Columbia of Pennsylvania's DSIC rate was set to zero due to the inclusion of the incremental capital and revenue in base rates following the Pennsylvania PUC's Final Order in the 2020 rate case.

(3)Decrease in incremental revenue is due to lower depreciation expense (pre-2018 base rate case vs post-2018 base rate case).

(4)On April 1, 2021, NIPSCO filed a notice with the IURC that it intends to terminate its current Electric TDSIC plan effective May 31, 2021. NIPSCO expects to file for a new electric TDSIC plan on or soon after June 1, 2021.

(5)Decrease in incremental revenue is inclusive of tracker eligible operations and maintenance expense. No eligible capital investments were made during the investment period.

Financing Activities

Common Stock and Preferred Stock. Refer to Note 5, “Equity,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on common and preferred stock activity.

Short-term Debt. Refer to Note 16, “Short-Term Borrowings,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on short-term debt activity.

Non-controlling Interest. Refer to Note 15, "Variable Interest Entities," in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on contributions from non-controlling interest activity.

Net Available Liquidity. As of March 31, 2021, an aggregate of $1,866.0 million of net liquidity was available, including cash and credit available under the revolving credit facility.

46

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

The following table displays our liquidity position as of March 31, 2021 and December 31, 2020:

(in millions)	March 31, 2021		December 31, 2020
Current Liquidity
Revolving Credit Facility	$	1,850.0	$	1,850.0
Accounts Receivable Program(1)	462.1		273.3
Less:
Commercial Paper	520.0		503.0
Accounts Receivable Program Utilized	—		—
Letters of Credit Outstanding Under Credit Facility	15.2		15.2
Add:
Cash and Cash Equivalents	89.1		116.5
Net Available Liquidity	$	1,866.0	$	1,721.6

(1)Represents the lesser of the seasonal limit or maximum borrowings supportable by the underlying receivables.

Debt Covenants. We are subject to financial covenants under our revolving credit facility, which require us to maintain a debt to capitalization ratio that does not exceed 70%. As of March 31, 2021, the ratio was 62.2%.

Sale of Trade Accounts Receivables. Refer to Note 11, “Transfers of Financial Assets,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on the sale of trade accounts receivable.

Credit Ratings. The credit rating agencies periodically review our ratings, taking into account factors such as our capital structure and earnings profile. The following table includes our and certain of our subsidiaries' credit ratings and ratings outlook as of March 31, 2021. There were no changes to the below credit ratings or outlooks since December 31, 2020.

A credit rating is not a recommendation to buy, sell, or hold securities, and may be subject to revision or withdrawal at any time by the assigning rating organization.

	S&P		Moody's		Fitch
	Rating	Outlook	Rating	Outlook	Rating	Outlook
NiSource	BBB+	Stable	Baa2	Stable	BBB	Stable
NIPSCO	BBB+	Stable	Baa1	Stable	BBB	Stable
Columbia of Massachusetts	BBB+	Stable	Baa2	Stable	Not rated	Not rated
Commercial Paper	A-2	Stable	P-2	Stable	F2	Stable

Certain of our subsidiaries have agreements that contain “ratings triggers” that require increased collateral if our credit rating or the credit ratings of certain of our subsidiaries are below investment grade. These agreements are primarily for insurance purposes and for the physical purchase or sale of power. As of March 31, 2021, the collateral requirement that would be required in the event of a downgrade below the ratings trigger levels would amount to approximately $54.8 million. In addition to agreements with ratings triggers, there are other agreements that contain “adequate assurance” or “material adverse change” provisions that could necessitate additional credit support such as letters of credit and cash collateral to transact business.

Equity. Our authorized capital stock consists of 620,000,000 shares, $0.01 par value, of which 600,000,000 are common stock and 20,000,000 are preferred stock. As of March 31, 2021, 392,129,866 shares of common stock and 440,000 shares of preferred stock were outstanding.

Contractual Obligations. There were no material changes during the three months ended March 31, 2021 to our contractual obligations as of December 31, 2020.

Guarantees and Indemnities. We and certain of our subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries as a part of normal business. Refer to Note 17, “Other Commitments and Contingencies,” in the Notes to the Condensed Consolidated Financial Statements (unaudited) for information on guarantees.

47

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Regulatory and Other Matters

Cost Recovery and Trackers

Comparability of our line item operating results is impacted by regulatory trackers that allow for the recovery in rates of certain costs such as those described below. Increases in the expenses that are subject to approved regulatory tracker mechanisms generally lead to increased regulatory assets, which ultimately result in a corresponding increase in operating revenues and, therefore, have essentially no impact on total operating income results. Certain approved regulatory tracker mechanisms allow for abbreviated regulatory proceedings in order for the operating companies to quickly implement revised rates and recover associated costs.

A portion of the Gas Distribution revenue is related to the recovery of gas costs, the review and recovery of which occurs through standard regulatory proceedings. All states in our operating area require periodic review of actual gas procurement activity to determine prudence and to confirm the recovery of prudently incurred energy commodity costs supplied to customers.

A portion of the Electric Operations revenue is related to the recovery of fuel costs to generate power and the fuel costs related to purchased power. These costs are recovered through a FAC, which is updated quarterly to reflect actual costs incurred to supply electricity to customers.

Increased efficiency of natural gas appliances and improvements in home building codes and standards has contributed to a long-term trend of declining average use per customer. While historical rate design at the distribution level has been structured such that a large portion of cost recovery is based upon throughput rather than in a fixed charge, operating costs are largely incurred on a fixed basis and do not fluctuate due to changes in customer usage. As a result, Gas Distribution Operations have pursued changes in rate design to more effectively match recoveries with costs incurred. Each of the states in which Gas Distribution Operations operate has different requirements regarding the procedure for establishing changes to rate design.

Columbia of Ohio has adopted a straight fixed variable rate design that closely links the recovery of fixed costs with fixed charges. Columbia of Maryland and Columbia of Virginia have regulatory approval for weather and revenue normalization adjustments for certain customer classes, which adjust monthly revenues that exceed or fall short of approved levels during specified heating months. Columbia of Pennsylvania continues to operate its pilot residential weather normalization adjustment and also has a fixed customer charge. This weather normalization adjustment only adjusts revenues when actual weather compared to normal varies by more than 3%. Columbia of Kentucky incorporates a weather normalization adjustment for certain customer classes and also has a fixed customer charge. In a prior gas base rate proceeding, NIPSCO implemented a higher fixed customer charge for residential and small customer classes moving toward recovering more of its fixed costs through a fixed recovery charge, but has no weather or usage protection mechanism.

Rate Case Actions

The following table describes current rate case actions as applicable in each of our jurisdictions net of tracker impacts:

(in millions)
Company	Proposed ROE		Approved ROE		Requested Incremental Revenue		Approved Incremental Revenue		Filed	Status	Rates Effective
Columbia of Pennsylvania(1)	9.86	%	9.86	%	$	76.8	$	63.5	April 24, 2020	Approved February 19, 2021	January 2021
Columbia of Pennsylvania	10.95	%	In process		$	98.3	In process		March 30, 2021	Order Expected Q4 2021	December 2021

(1)The 9.86% ROE and the $76.8 million requested incremental revenue stated above reflect compromise positions taken by Columbia of Pennsylvania during the briefing stages of its 2020 base rate case. In its initial filing on April 24, 2020, Columbia of Pennsylvania proposed an ROE of 10.95% and requested incremental revenue of $100.4 million. A Final Order from the Pennsylvania PUC was received on February 19, 2021 for rates effective retroactive to January 23, 2021. On March 8, 2021, the Pennsylvania Office of Consumer Advocate filed a Petition for Reconsideration, seeking to have the Pennsylvania PUC modify its February 19 Final Order. On April 15, 2021, the Pennsylvania PUC issued an Opinion and Order denying the Office of Consumer Advocate’s Petition. Parties have 30 days in which to file an appeal.

In addition to the rate case actions noted in the table above, Columbia of Kentucky has filed a Notice of Intent to file a base rate case on May 28, 2021 or soon thereafter.

48

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Regulatory and Other Matters

COVID-19 Regulatory Deferrals

In addition to the cost deferred to a regulatory asset as noted in Note 8, "Regulatory Matters", in the Notes to Condensed Consolidated Financial Statements (unaudited), certain states have permitted us to track lost late and disconnect fee revenues due to the pandemic. While these costs do not qualify as regulatory assets under ASC 980, we will consider seeking recovery of these costs in future regulatory proceedings.

PHMSA Regulations

On December 27, 2020, the Protecting Our Infrastructure of Pipelines and Enhancing Safety (PIPES) Act of 2020 was signed into law reauthorizing funding for federal pipeline safety programs through September 30, 2023. Among other things, the PIPES Act requires that PHMSA revise the pipeline safety regulations to require operators to update, as needed, their existing distribution integrity management plans, emergency response plans, and O&M plans. The PIPES Act also requires PHMSA to adopt new requirements for managing records and updating, as necessary existing district regulator stations to eliminate common modes of failure that can lead to overpressurization. PHMSA must also require that operators implement leak detection and repair programs that meet safety needs and protect the environment, require the use of advance leak detection practices and technologies, and require operators to be able to locate and categorize all leaks that are hazardous to human safety or the environment, or that can become hazardous. Natural gas companies, including the Company, may see increased costs depending on how PHMSA implements the new mandates resulting from the PIPES Act.

Climate Issues

Future legislative and regulatory programs could significantly limit allowed GHG emissions or impose a cost or tax on GHG emissions. Additionally, rules that require further GHG reductions or impose additional requirements for natural gas facilities could impose additional costs.

In February 2021, the United States rejoined the Paris Agreement, an international treaty through which parties set nationally determined contributions to reduce GHG emissions, build resilience, and adapt to the impacts of climate change. Subsequently, the Biden Administration released a target for the United States to achieve a 50%-52% GHG reduction from 2005 levels by 2030, which supports the President's goals to create a carbon-free power sector by 2035 and net zero emissions economy no later than 2050. There are many pathways to reach these goals. We will carefully monitor all climate-related policy as we continue to actively implement our plans to be coal-free by 2028 and achieve our 90% GHG reduction target by 2030.

On July 8, 2019, the EPA published the final ACE rule, which establishes emission guidelines for states to use when developing plans to limit carbon dioxide at coal-fired electric generating units based on heat rate improvement measures. The U.S. Court of Appeals for the D.C. Circuit vacated and remanded the rule on January 19, 2021. NIPSCO will continue to monitor this matter.

49

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Off-Balance Sheet Arrangements

We, along with certain of our subsidiaries, enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include guarantees and stand-by letters of credit.

Refer to Note 17, “Other Commitments and Contingencies,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about such arrangements.

Market Risk Disclosures

Risk is an inherent part of our businesses. The extent to which we properly and effectively identify, assess, monitor and manage each of the various types of risk involved in our businesses is critical to our profitability. We seek to identify, assess, monitor and manage, in accordance with defined policies and procedures, the following principal market risks that are involved in our businesses: commodity price risk, interest rate risk and credit risk. We manage risk through a multi-faceted process with oversight by the Risk Management Committee that requires constant communication, judgment and knowledge of specialized products and markets. Our senior management takes an active role in the risk management process and has developed policies and procedures that require specific administrative and business functions to assist in the identification, assessment and control of various risks. These may include, but are not limited to market, operational, financial, compliance and strategic risk types. In recognition of the increasingly varied and complex nature of the energy business, our risk management process, policies and procedures continue to evolve and are subject to ongoing review and modification.

Commodity Price Risk

We are exposed to commodity price risk as a result of our subsidiaries’ operations involving natural gas and power. To manage this market risk, our subsidiaries use derivatives, including commodity futures contracts, swaps, forwards and options. We do not participate in speculative energy trading activity.

Commodity price risk resulting from derivative activities at our rate-regulated subsidiaries is limited, since regulations allow recovery of prudently incurred purchased power, fuel and gas costs through the ratemaking process, including gains or losses on these derivative instruments. If states should explore additional regulatory reform, these subsidiaries may begin providing services without the benefit of the traditional ratemaking process and may be more exposed to commodity price risk.

Our subsidiaries are required to make cash margin deposits with their brokers to cover actual and potential losses in the value of outstanding exchange traded derivative contracts. The amount of these deposits, some of which are reflected in our restricted cash balance, may fluctuate significantly during periods of high volatility in the energy commodity markets.

Refer to Note 9, "Risk Management Activities," in the Notes to Condensed Consolidated Financial Statements (unaudited) for further information on our commodity price risk assets and liabilities as of March 31, 2021 or December 31, 2020.

Interest Rate Risk

We are exposed to interest rate risk as a result of changes in interest rates on borrowings under our revolving credit agreement, commercial paper program, accounts receivable programs and now-settled term loan, which have interest rates that are indexed to short-term market interest rates. Based upon average borrowings and debt obligations subject to fluctuations in short-term market interest rates, an increase (or decrease) in short-term interest rates of 100 basis points (1%) would have increased (or decreased) interest expense by $1.2 million and $4.3 million for the three months ended March 31, 2021, and March 31, 2020, respectively. We are also exposed to interest rate risk as a result of changes in benchmark rates that can influence the interest rates of future debt issuances.

Refer to Note 9, "Risk Management Activities," in the Notes to Condensed Consolidated Financial Statements (unaudited) for further information on our interest rate risk assets and liabilities as of March 31, 2021 and December 31, 2020. 

50

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Credit Risk

Due to the nature of the industry, credit risk is embedded in many of our business activities. Our extension of credit is governed by a Corporate Credit Risk Policy. In addition, Risk Management Committee guidelines are in place which document management approval levels for credit limits, evaluation of creditworthiness, and credit risk mitigation efforts. Exposures to credit risks are monitored by the risk management function, which is independent of commercial operations. Credit risk arises due to the possibility that a customer, supplier or counterparty will not be able or willing to fulfill its obligations on a transaction on or before the settlement date. For derivative-related contracts, credit risk arises when counterparties are obligated to deliver or purchase defined commodity units of gas or power to us at a future date per execution of contractual terms and conditions. Exposure to credit risk is measured in terms of both current obligations and the market value of forward positions net of any posted collateral such as cash and letters of credit.

We closely monitor the financial status of our banking credit providers. We evaluate the financial status of our banking partners through the use of market-based metrics such as credit default swap pricing levels, and also through traditional credit ratings provided by major credit rating agencies.

Certain individual state regulatory commissions instituted regulatory moratoriums in connection with the COVID-19 pandemic that impacted our ability to pursue our credit risk mitigation practices for customer accounts receivable. Following the issuances of these moratoriums, certain of our regulated operations have been authorized to recognize a regulatory asset for bad debt costs above levels currently in rates. We have reinstated our common credit mitigation practices where moratoriums have expired. Refer to Note 8, "Regulatory Matters" in the Notes to Condensed Consolidated Financial Statements (unaudited) for state-specific regulatory moratoriums.

Other Information

Critical Accounting Estimates

Refer to Note 3, "Revenue Recognition," in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about management judgment used in determining allowance for credit losses.

Refer to Note 12, "Goodwill," in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about management judgment used in the annual goodwill impairment analysis performed as of May 1, 2020.

Refer to Note 15, "Variable Interest Entities," in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about management judgement used in determining how to account for our variable interest entity.

Recently Issued Accounting Pronouncements

Refer to Note 2, "Recent Accounting Pronouncements," in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about recently issued and adopted accounting pronouncements.

51

NiSource Inc.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

For a discussion regarding quantitative and qualitative disclosures about market risk see “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Market Risk Disclosures.”

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our chief executive officer and our chief financial officer are responsible for evaluating the effectiveness of our disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)). Our disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed by us in reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our chief executive officer and chief financial officer, as appropriate, to allow timely decisions regarding required disclosure and is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC. Based upon that evaluation, our chief executive officer and chief financial officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective to provide reasonable assurance that financial information was processed, recorded and reported accurately.

Changes in Internal Controls

There have been no changes in our internal control over financial reporting during the most recently completed quarter covered by this report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

52

NiSource Inc.

PART II

ITEM 1. LEGAL PROCEEDINGS

For a description of our legal proceedings, see Note 17-B, "Legal Proceedings," in the Notes to Condensed Consolidated Financial Statements (unaudited).

ITEM 1A. RISK FACTORS

The risk factors set forth in Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 are supplemented with the following risk factors, which should be read in conjunction with the risk factors set forth in the Annual Report on Form 10-K.

Risk Factors Relating to our Equity Units

The trading prices for our Equity Units, initially consisting of Corporate Units, and related treasury units and mandatory convertible preferred stock, are expected to be affected by, among other things, the trading prices of our common stock, the general level of interest rates and our credit quality.

The trading prices of the Equity Units, initially consisting of Corporate Units, which are listed on the New York Stock Exchange, and the related treasury units and mandatory convertible preferred stock in the secondary market, are expected to be affected by, among other things, the trading prices of our common stock, the general level of interest rates and our credit quality. It is impossible to predict whether the price of our common stock or interest rates will rise or fall. The price of our common stock could be subject to wide fluctuations in the future in response to many events or factors, including those discussed in the risk factors herein and in our Annual Report on Form 10-K for the year ended December 31, 2020, as may be supplemented by subsequently filed Quarterly Reports on Form 10-Q, many of which events and factors are beyond our control. Fluctuations in interest rates may give rise to arbitrage opportunities based upon changes in the relative value of the common stock underlying the purchase contracts and of the other components of the Equity Units. Any such arbitrage could, in turn, affect the trading prices of the Corporate Units, treasury units, mandatory convertible preferred stock and our common stock.

The fundamental change early settlement right triggered under certain circumstances by a fundamental change and the supermajority rights of the mandatory convertible preferred stock in connection with certain fundamental change transactions jointly could discourage a potential acquirer.

The fundamental change early settlement right with respect to the purchase contracts triggered under certain circumstances by a fundamental change and the supermajority voting rights of the mandatory convertible preferred stock in connection with certain fundamental change transactions jointly could discourage a potential acquirer, including potential acquirers that would otherwise seek a transaction with us that would be attractive to our investors.

Our Equity Units, initially consisting of Corporate Units, and related mandatory convertible preferred stock, and the issuance and sale of common stock in settlement of the purchase contracts and conversion of mandatory convertible preferred stock, may all adversely affect the market price of our common stock and will cause dilution to our stockholders.

The market price of our common stock is likely to be influenced by our Equity Units, initially consisting of Corporate Units, and related mandatory convertible preferred stock. For example, the market price of our common stock could become more volatile and could be depressed by:

•investors’ anticipation of the sale into the market of a substantial number of additional shares of our common stock issued upon settlement of the purchase contracts or conversion of our mandatory convertible preferred stock;

•possible sales of our common stock by investors who view our Equity Units, initially consisting of Corporate Units, or related mandatory convertible preferred stock as a more attractive means of equity participation in us than owning shares of our common stock; and

•hedging or arbitrage trading activity that we expect to develop involving our Equity Units, initially consisting of Corporate Units, or related mandatory convertible preferred stock and our common stock.

In addition, we cannot predict the effect that future issuances or sales of our common stock, if any, including those made upon the settlement of the purchase contracts or conversion of the mandatory convertible preferred stock, may have on the market price for our common stock.

53

ITEM 1A. RISK FACTORS

NiSource Inc.

Our Equity Units, initially consisting of Corporate Units, and the issuance and sale of substantial amounts of common stock, including issuances and sales upon the settlement of the purchase contracts or conversion of the mandatory convertible preferred stock, could adversely affect the market price of our common stock and will cause dilution to our stockholders.

Operational Risk

A cyber-attack on any of our or certain third-party computer systems upon which we rely may adversely affect our ability to operate and could lead to a loss or misuse of confidential and proprietary information or potential liability.

We are reliant on technology to run our business, which is dependent upon financial and operational computer systems to process critical information necessary to conduct various elements of our business, including the generation, transmission and distribution of electricity; operation of our gas pipeline facilities; and the recording and reporting of commercial and financial transactions to regulators, investors and other stakeholders. In addition to general information and cyber risks that all large corporations face (e.g., malware, unauthorized access attempts, phishing attacks, malicious intent by insiders, third-party software vulnerabilities and inadvertent disclosure of sensitive information), the utility industry faces evolving and increasingly complex cybersecurity risks associated with protecting sensitive and confidential customer and employee information, electric grid infrastructure, and natural gas infrastructure. Deployment of new business technologies, along with maintaining legacy technology, represents a large-scale opportunity for attacks on our information systems and confidential customer and employee information, as well as on the integrity of the energy grid and the natural gas infrastructure. Increasing large-scale corporate attacks in conjunction with more sophisticated threats continue to challenge power and utility companies. Any failure of our computer systems, or those of our customers, suppliers or others with whom we do business, could materially disrupt our ability to operate our business and could result in a financial loss and possibly do harm to our reputation.

Additionally, our information systems experience ongoing, often sophisticated, cyber-attacks by a variety of sources, including foreign sources, with the apparent aim to breach our cyber-defenses. Although we attempt to maintain adequate defenses to these attacks and work through industry groups and trade associations to identify common threats and assess our countermeasures, a security breach of our information systems, or a security breach of the information systems of our customers, suppliers or others with whom we do business, could (i) adversely impact our ability to safely and reliably deliver electricity and natural gas to our customers through our generation, transmission and distribution systems and potentially negatively impact our compliance with certain mandatory reliability and gas flow standards, (ii) subject us to reputational and other harm or liabilities associated with theft or inappropriate release of certain types of information such as system operating information or information, personal or otherwise, relating to our customers or employees, (iii) impact our ability to manage our businesses, and/or (iv) subject us to legal and regulatory proceedings and claims from third parties, in addition to remediation costs, any of which, in turn, could have a material adverse effect on our businesses, cash flows, financial condition, results of operations and/or prospects. Although we do maintain cyber insurance, it is possible that such insurance will not adequately cover any losses or liabilities we may incur as a result of a cybersecurity incident.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

54

ITEM 6. EXHIBITS

NiSource Inc.

(1.1)	Form of Equity Distribution Agreement (incorporated by reference to Exhibit 1.1 of the NiSource Inc. Form 8-K filed on February 22, 2021).
(1.2)	Form of Master Forward Sale Confirmation (incorporated by reference to Exhibit 1.2 of the NiSource Inc. Form 8-K filed on February 22, 2021).
(3.1)	Certificate of Designations with respect to the Series C Mandatory Convertible Preferred Stock, dated April 19, 2021 (incorporated by reference to Exhibit 3.1 of the NiSource Inc. Form 8-K filed on April 19, 2021).
(4.1)	Purchase Contract and Pledge Agreement, dated April 19, 2021, between NiSource Inc. and U.S. Bank National Association, in its capacity as the purchase contract agent, collateral agent, custodial agent and securities intermediary (incorporated by reference to Exhibit 4.1 of the NiSource Inc. Form 8-K filed on April 19, 2021).
(4.2)	Form of Series A Corporate Units Certificate (incorporated by reference listed under Exhibit 4.1 above).
(4.3)	Form of Series A Treasury Units Certificate (incorporated by reference listed under Exhibit 4.1 above).
(4.4)	Form of Series A Cash Settled Units Certificate (incorporated by reference listed under Exhibit 4.1 above).
(4.5)	Form of Series C Mandatory Convertible Preferred Stock Certificate (incorporated by reference listed under Exhibit 3.1 above).
(31.1)	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.*
(31.2)	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.*
(32.1)	Certification of Chief Executive Officer pursuant to 18. U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).*
(32.2)	Certification of Chief Financial Officer pursuant to 18. U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).*
(101.INS)	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
(101.SCH)	Inline XBRL Schema Document
(101.CAL)	Inline XBRL Calculation Linkbase Document
(101.LAB)	Inline XBRL Labels Linkbase Document
(101.PRE)	Inline XBRL Presentation Linkbase Document
(101.DEF)	Inline XBRL Definition Linkbase Document
(104)	Cover page Interactive Data File (formatted as inline XBRL, and contained in Exhibit 101.)
*	Exhibit filed herewith.

55

SIGNATURE

NiSource Inc.

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.

			NiSource Inc.
			(Registrant)
Date:	May 5, 2021	By:	/s/ Gunnar J. Gode
			Gunnar J. Gode
			Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)

56

EX-31.1

Exhibit 31.1

Certification Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Joseph Hamrock, certify that:

1.I have reviewed this Quarterly Report of NiSource Inc. on Form 10-Q for the quarter ended March 31, 2021;

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(s) 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(s) 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 5, 2021	By:	/s/ Joseph Hamrock
			Joseph Hamrock
			President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Donald E. Brown, certify that:

1.I have reviewed this Quarterly Report of NiSource Inc. on Form 10-Q for the quarter ended March 31, 2021;

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(s) 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(s) 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 5, 2021	By:	/s/ Donald E. Brown
			Donald E. Brown
			Executive Vice President, Chief Financial Officer, and President of NiSource Corporate Services

EX-32.1

Exhibit 32.1

Certification Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of NiSource Inc. (the “Company”) on Form 10-Q for the quarter ending March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Joseph Hamrock, Chief Executive Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

		/s/ Joseph Hamrock
		Joseph Hamrock
		President and Chief Executive Officer
Date:	May 5, 2021

EX-32.2

Exhibit 32.2

Certification Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of NiSource Inc. (the “Company”) on Form 10-Q for the quarter ending March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Donald E. Brown, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

		/s/ Donald E. Brown
		Donald E. Brown
		Executive Vice President, Chief Financial Officer, and President of NiSource Corporate Services
Date:	May 5, 2021

XML

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 26, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-16189
Entity Registrant Name	NiSource Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2108964
Entity Address, Address Line One	801 East 86th Avenue
Entity Address, City or Town	Merrillville,
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46410
City Area Code	(877)
Local Phone Number	647-5990
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		392,217,046
Entity Central Index Key	0001111711
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Series A Corporate Units
Document Information [Line Items]
Title of 12(b) Security	Series A Corporate Units
Trading Symbol	NIMC
Security Exchange Name	NYSE
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NI
Security Exchange Name	NYSE
Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th ownership interest in a share of 6.50% Series B
Trading Symbol	NI PR B
Security Exchange Name	NYSE

XML

Statements Of Consolidated Income (Loss) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues
Customer revenues	$ 1,506.5	$ 1,525.9
Other revenues	39.1	79.6
Total Operating Revenues	1,545.6	1,605.5
Operating Expenses
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	476.8	462.4
Operation and maintenance	361.5	444.6
Depreciation and amortization	185.0	184.3
Loss on sale of assets, net	8.1	280.1
Other taxes	81.0	85.9
Operating Costs and Expenses	1,112.4	1,457.3
Operating Income	433.2	148.2
Other Income (Deductions)
Interest expense, net	(84.6)	(92.9)
Other, net	10.5	5.4
Total Other Deductions, Net	(74.1)	(87.5)
Income before Income Taxes	359.1	60.7
Income Taxes	62.6	(14.9)
Net Income	296.5	75.6
Net income attributable to noncontrolling interest	1.0	0.0
Net Income attributable to NiSource	295.5	75.6
Preferred dividends	(13.8)	(13.8)
Net Income Available to Common Shareholders	$ 281.7	$ 61.8
Earnings Per Share
Basic Earnings Per Share	$ 0.72	$ 0.16
Diluted Earnings Per Share	$ 0.72	$ 0.16
Basic Average Common Shares Outstanding	392,657	383,062
Diluted Average Common Shares	393,912	384,114

XML

Statements of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net Income		$ 296.5	$ 75.6
Other comprehensive income (loss):
Net unrealized loss on available-for-sale securities	[1]	(2.5)	(5.4)
Net unrealized gain (loss) on cash flow hedges	[2]	84.6	(133.3)
Unrecognized pension and OPEB benefit (costs)	[3]	(0.9)	0.7
Total other comprehensive income (loss)		81.2	(138.0)
Comprehensive Income (Loss)		$ 377.7	$ (62.4)

[1] Net unrealized loss on available-for-sale debt securities, net of $0.7 million and $1.4 million tax benefit in the first quarter of 2021 and 2020, respectively.

[2] Net unrealized gain (loss) on cash flow hedges, net of $28.0 million tax expense and $44.1 million tax benefit in the first quarter of 2021 and 2020, respectively.

[3] Unrecognized pension and OPEB benefit (costs), net of $0.9 million tax expense and $0.3 million tax benefit in the first quarter of 2021 and 2020, respectively.

XML

Statements of Consolidated Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	$ (0.7)	$ (1.4)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	28.0	(44.1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (0.9)	$ 0.3

XML

Statements of Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Plant		$ 24,524.7	$ 24,179.9
Accumulated depreciation and amortization		(7,688.0)	(7,560.4)
Net Property, Plant and Equipment	[1]	16,836.7	16,619.5
Investments and Other Assets
Available-for-sale debt securities (amortized cost of $163.8 and $163.9, allowance for credit losses of $0.3 and $0.5, respectively)		167.9	170.9
Other investments		81.5	81.1
Total Investments and Other Assets		249.4	252.0
Current Assets
Cash and cash equivalents		89.1	116.5
Restricted Cash		7.6	9.1
Accounts receivable		848.4	843.6
Allowance for credit losses		(53.9)	(52.3)
Accounts receivable, net		794.5	791.3
Gas inventory		48.1	191.2
Materials and supplies, at average cost		145.6	141.5
Electric production fuel, at average cost		52.5	68.4
Exchange gas receivable		53.7	34.1
Regulatory assets		188.9	135.7
Deferred property taxes		104.2	85.6
Prepayments and other		109.3	86.0
Total Current Assets	[1]	1,593.5	1,659.4
Other Assets
Regulatory assets		1,791.3	1,794.8
Goodwill		1,485.9	1,485.9
Deferred charges and other		237.7	228.9
Total Other Assets		3,514.9	3,509.6
Total Assets		22,194.5	22,040.5
Stockholders' Equity
Common stock - $0.01 par value, 600,000,000 shares authorized; 392,129,866 and 391,760,051 shares outstanding, respectively		3.9	3.9
Preferred stock - $0.01 par value, 20,000,000 shares authorized; 440,000 shares outstanding		880.0	880.0
Treasury stock		(99.9)	(99.9)
Additional paid-in capital		6,892.9	6,890.1
Retained deficit		(1,669.8)	(1,765.2)
Accumulated other comprehensive loss		(75.5)	(156.7)
Total NiSource Stockholders’ Equity		5,931.6	5,752.2
Noncontrolling interest in consolidated subsidiaries		94.1	85.6
Total Stockholders' Equity		6,025.7	5,837.8
Long-term debt, excluding amounts due within one year		9,202.3	9,219.8
Total Capitalization		15,228.0	15,057.6
Current Liabilities
Current portion of long-term debt		44.4	23.3
Short-term borrowings		520.0	503.0
Accounts payable		554.9	589.0
Dividends payable - common stock		86.3	0.0
Dividends payable - preferred stock		19.4	0.0
Customer deposits and credits		146.7	243.3
Taxes accrued		301.5	244.1
Interest accrued		94.6	104.7
Exchange gas payable		25.5	48.5
Regulatory liabilities		169.6	161.3
Accrued compensation and employee benefits		131.2	141.8
Other accruals		164.7	220.4
Total Current Liabilities		2,258.8	2,279.4
Other Liabilities
Deferred income taxes		1,573.6	1,470.6
Accrued liability for postretirement and postemployment benefits		328.9	336.1
Regulatory liabilities		1,881.0	1,904.2
Asset retirement obligations		479.7	477.1
Other noncurrent liabilities		444.5	515.5
Total Other Liabilities		4,707.7	4,703.5
Total Capitalization and Liabilities		$ 22,194.5	$ 22,040.5

[1] (1)Includes $174.2 million and $175.6 million of net property, plant and equipment assets and $4.2 million and $1.7 million of current assets of a consolidated VIE as of March 31, 2021 and December 31, 2020 that may be used only to settle obligations of the consolidated VIE. Refer to Note 15 "Variable Interest Entities" for additional information.

XML

Statements of Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost	$ 163.8	$ 163.9
Allowance for Credit Loss	$ 0.3	$ 0.5
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	600,000,000	600,000,000
Common Stock, Shares, Outstanding	392,129,866	391,760,051
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Shares Outstanding	440,000	440,000

XML

Statements Of Consolidated Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net Income	$ 296.5	$ 75.6
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:
Depreciation and amortization	185.0	184.3
Deferred income taxes and investment tax credits	55.2	(19.9)
Loss on sale of assets	8.1	280.2
Other adjustments	3.5	7.9
Changes in Assets and Liabilities:
Components of working capital	(89.3)	(147.1)
Regulatory assets/liabilities	8.4	12.9
Deferred charges and other noncurrent assets	(10.7)	(12.1)
Other noncurrent liabilities	(8.4)	(11.9)
Net Cash Flows from Operating Activities	448.3	369.9
Investing Activities
Capital expenditures	(367.0)	(452.1)
Cost of removal	(26.9)	(34.5)
Purchases of available-for-sale securities	(16.6)	(43.5)
Sales of available-for-sale securities	16.9	45.4
Payment to renewable generation asset developer	(7.4)	0.0
Other investing activities	(0.8)	0.1
Net Cash Flows used for Investing Activities	(401.8)	(484.6)
Financing Activities
Repayments of long-term debt and finance lease obligations	(5.9)	(4.1)
Issuance of short-term debt (maturity greater than 90 days)	0.0	500.0
Change in short-term borrowings, net (maturity ≤ 90 days)	17.0	(226.8)
Issuance of common stock, net of issuance costs	2.8	3.7
Equity costs, premiums and other debt related costs	(2.5)	(5.1)
Contributions from non-controlling interest, net of issuance costs	7.5	0.0
Dividends paid - common stock	(86.2)	(80.3)
Dividends paid - preferred stock	(8.1)	(8.1)
Net Cash Flows (used for) from Financing Activities	(75.4)	179.3
Change in cash, cash equivalents and restricted cash	(28.9)	64.6
Cash, cash equivalents and restricted cash at beginning of period	125.6	148.4
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 96.7	$ 213.0

XML

Statements Of Consolidated Cash Flows (Supplemental Disclosures of Cash Flow Information) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Capital expenditures included in current liabilities	$ 155.6	$ 150.5
Dividends declared but not paid	105.7	99.8
Assets recorded for asset retirement obligations	0.0	69.8
Obligation to developer at formation of joint venture	$ 6.0	$ 0.0

XML

Statements Of Consolidated Equity - USD ($) $ in Millions	Total	Common Stock	Preferred Stock	[1]	Treasury Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning balance at Dec. 31, 2019	$ 5,986.7	$ 3.8	$ 880.0		$ (99.9)	$ 6,666.2	$ (1,370.8)	$ (92.6)	$ 0.0
Comprehensive Income:
Net Income	75.6	0.0	0.0		0.0	0.0	75.6	0.0	0.0
Other comprehensive income (loss), net of tax	(138.0)	0.0	0.0		0.0	0.0	0.0	(138.0)	0.0
Dividends:
Common stock	(160.7)	0.0	0.0		0.0	0.0	(160.7)	0.0	0.0
Preferred stock	(27.5)	0.0	0.0		0.0	0.0	(27.5)	0.0	0.0
Stock Issuances:
Employee stock purchase plan	1.3	0.0	0.0		0.0	1.3	0.0	0.0	0.0
Long-term incentive plan	(0.5)	0.0	0.0		0.0	(0.5)	0.0	0.0	0.0
401(k) and profit sharing	4.5	0.0	0.0		0.0	4.5	0.0	0.0	0.0
Ending balance at Mar. 31, 2020	5,741.4	3.8	880.0		(99.9)	6,671.5	(1,483.4)	(230.6)	0.0
Beginning balance at Dec. 31, 2020	5,837.8	3.9	880.0		(99.9)	6,890.1	(1,765.2)	(156.7)	85.6
Comprehensive Income:
Net Income	296.5	0.0	0.0		0.0	0.0	295.5	0.0	1.0
Other comprehensive income (loss), net of tax	81.2	0.0	0.0		0.0	0.0	0.0	81.2	0.0
Dividends:
Common stock	(172.6)	0.0	0.0		0.0	0.0	(172.6)	0.0	0.0
Preferred stock	(27.5)	0.0	0.0		0.0	0.0	(27.5)	0.0	0.0
Contribution from noncontrolling interest	7.5	0.0	0.0		0.0	0.0	0.0	0.0	7.5
Stock Issuances:
Employee stock purchase plan	1.3	0.0	0.0		0.0	1.3	0.0	0.0	0.0
Long-term incentive plan	(0.5)	0.0	0.0		0.0	(0.5)	0.0	0.0	0.0
401(k) and profit sharing	2.3	0.0	0.0		0.0	2.3	0.0	0.0	0.0
ATM program	(0.3)	0.0	0.0		0.0	(0.3)	0.0	0.0	0.0
Ending balance at Mar. 31, 2021	$ 6,025.7	$ 3.9	$ 880.0		$ (99.9)	$ 6,892.9	$ (1,669.8)	$ (75.5)	$ 94.1

[1] (1)Series A and Series B shares have an aggregate liquidation preference of $400M and $500M, respectively. See Note 5, "Equity" for additional information.

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Statements of Consolidated Equity (Shares) - shares shares in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock
Beginning balance at Dec. 31, 2019	382,136	440	386,099	(3,963)
Issued:
Employee stock purchase plan	46	0	46	0
Long-term incentive plan	347	0	347	0
401(k) and profit sharing	165	0	165	0
Ending balance at Mar. 31, 2020	382,694	440	386,657	(3,963)
Beginning balance at Dec. 31, 2020	391,760	440	395,723	(3,963)
Issued:
Employee stock purchase plan	55	0	55	0
Long-term incentive plan	212	0	212	0
401(k) and profit sharing	103	0	103	0
Ending balance at Mar. 31, 2021	392,130	440	396,093	(3,963)

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Statements Of Consolidated Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common Stock, Dividends, Per Share, Declared	$ 0.44	$ 0.42
Series A Preferred Stock
Preferred Stock, Liquidation Preference, Value	$ 400	$ 400
Series B Preferred Stock
Preferred Stock, Liquidation Preference, Value	$ 500	$ 500

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Basis of Accounting Presentation

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting Presentation

Basis of Accounting Presentation

Our accompanying Condensed Consolidated Financial Statements (unaudited) reflect all normal recurring adjustments that are necessary, in the opinion of management, to present fairly the results of operations in accordance with GAAP in the United States of America. The accompanying financial statements include the accounts of us, our majority-owned subsidiaries, and VIEs of which we are the primary beneficiary after the elimination of all intercompany accounts and transactions.

The accompanying financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. Income for interim periods may not be indicative of results for the calendar year due to weather variations and other factors.

The Condensed Consolidated Financial Statements (unaudited) have been prepared pursuant to the rules and regulations of the SEC. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made in this Quarterly Report on Form 10-Q are adequate to make the information herein not misleading.

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Recent Accounting Pronouncements

3 Months Ended

Mar. 31, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Recently Issued Accounting Pronouncements

We are currently evaluating the impact of certain ASUs on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited), which are described below:

Standard	Description	Effective Date	Effect on the financial statements or other significant matters
ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Statement	This pronouncement provides temporary optional expedients and exceptions for applying GAAP principles to contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates.	Upon issuance on March 12, 2020, and will apply though December 31, 2022.	We continue to evaluate the temporary expedients and options available under this guidance, and the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited). We are currently identifying and evaluating contracts that may be impacted. As of March 31, 2021, we have not applied any expedients and options available under this ASU.
ASU 2021-01, Reference Rate Reform (Topic 848): Scope
ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivative and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity	This pronouncement simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity's own equity. Specifically, the ASU "simplifies accounting for convertible instruments by removing major separation models required under current GAAP." In addition, the ASU "removes certain settlement conditions that are required for equity contracts to qualify for it" and "simplifies the diluted earnings per share (EPS) calculations in certain areas."	Annual period beginning after December 15, 2021, and interim periods within those fiscal years.	We continue to evaluate the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited) as it pertains to any relevant future activity. We expect to adopt this ASU on its effective date.

Recently Adopted Accounting Pronouncements

Standard

Adoption

ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes

This pronouncement simplifies the accounting for income taxes by eliminating certain exceptions to the general principles in ASC 740, income taxes. It also improves consistency of application for other areas of the guidance by clarifying and amending existing guidance. We adopted the amendments of this pronouncement as of January 1, 2021 with no material impact to the Condensed Consolidated Financial Statements (unaudited).

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Revenue Recognition

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

Revenue RecognitionRevenue Disaggregation and Reconciliation. We disaggregate revenue from contracts with customers based upon reportable segment, as well as by customer class. As our revenues are primarily earned over a period of time and we do not earn a material amount of revenues at a point in time, revenues are not disaggregated as such below. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, and Indiana. We completed the sale of the Massachusetts Business on October 9, 2020. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.

The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Condensed Statements of Consolidated Income (unaudited) for the three months ended March 31, 2021 and March 31, 2020:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other(2)		Total
Customer Revenues(1)
Residential	$	773.5	$	129.2	$	—	$	902.7
Commercial	271.4		122.9		—		394.3
Industrial	57.9		122.9		—		180.8
Off-system	14.4		—		—		14.4
Miscellaneous	9.9		4.2		0.2		14.3
Total Customer Revenues	$	1,127.1	$	379.2	$	0.2	$	1,506.5
Other Revenues	8.7		23.3		7.1		39.1
Total Operating Revenues	$	1,135.8	$	402.5	$	7.3	$	1,545.6

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

(2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.

Three Months Ended March 31, 2020 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Customer Revenues(1)
Residential	$	796.5	$	119.2	$	—	$	915.7
Commercial	269.4		120.2		—		389.6
Industrial	74.2		109.1		—		183.3
Off-system	18.7		—		—		18.7
Miscellaneous	12.5		5.9		0.2		18.6
Total Customer Revenues	$	1,171.3	$	354.4	$	0.2	$	1,525.9
Other Revenues	56.7		22.9		—		79.6
Total Operating Revenues	$	1,228.0	$	377.3	$	0.2	$	1,605.5

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

Customer Accounts Receivable. Accounts receivable on our Condensed Consolidated Balance Sheets (unaudited) includes both billed and unbilled amounts, as well as certain amounts that are not related to customer revenues. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the date of the last cycle billing through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates and weather. The opening and closing balances of customer receivables for the three months ended March 31, 2021 are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.

(in millions)	Customer Accounts Receivable, Billed (less reserve)		Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020	$	400.0	$	327.2
Balance as of March 31, 2021	507.4		244.3
Increase (Decrease)	$	107.4	$	(82.9)

Utility revenues are billed to customers monthly on a cycle basis. We expect that substantially all customer accounts receivable will be collected following customer billing, as this revenue consists primarily of periodic, tariff-based billings for service and usage. We maintain common utility credit risk mitigation practices, including requiring deposits and actively pursuing collection of past due amounts. Our regulated operations also utilize certain regulatory mechanisms that facilitate recovery of bad debt costs within tariff-based rates, which provides further evidence of collectibility. In connection with the COVID-19 pandemic, certain state regulatory commissions instituted regulatory moratoriums that impacted our ability to pursue our

standard credit risk mitigation practices. Following the issuance of these moratoriums, certain of our regulated operations have been authorized to recognize a regulatory asset for bad debt costs above levels currently in rates. We have reinstated our common credit mitigation practices where moratoriums have expired (see Note 8, "Regulatory Matters," for additional information on regulatory moratoriums and regulatory assets). It is probable that substantially all of the consideration to which we are entitled from customers will be collected upon satisfaction of performance obligations.

Allowance for Credit Losses. To evaluate for expected credit losses, customer account receivables are pooled based on similar risk characteristics, such as customer type, geography, payment terms, and related macro-economic risks. Expected credit losses are established using a model that considers historical collections experience, current information, and reasonable and supportable forecasts. Relevant and reliable internal and external inputs used in the model include, but are not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-off orders executed data, and final bill data. We continuously evaluate available reasonable and supportable information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or when required by changes in facts and circumstances. When we become aware of a specific commercial or industrial customer's inability to pay, an allowance for expected credit losses is recorded for the relevant amount. We also monitor other circumstances that could affect our overall expected credit losses; these include, but are not limited to, creditworthiness of overall population in service territories, adverse conditions impacting an industry sector, and current economic conditions.

At each reporting period, we record expected credit losses using an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses for the three months ended March 31, 2021 are presented in the table below:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Beginning balance	$	41.8	$	9.7	$	0.8	$	52.3
Current period provisions	5.9		2.9		—		8.8
Write-offs charged against allowance	(9.0)		(2.4)		—		(11.4)
Recoveries of amounts previously written off	4.1		0.1		—		4.2
Ending balance of the allowance for credit losses	$	42.8	$	10.3	$	0.8	$	53.9

As of March 31, 2021, we have also evaluated the adequacy of our allowance for credit losses in light of the suspension of shut-offs for nonpayment due to the COVID-19 pandemic that remain in effect for certain jurisdictions. Our evaluation included an analysis of customer payment trends in 2020, economic conditions, receivables aging, considerations of past economic downturns and the associated allowance for credit losses and customer account write-offs. In addition, we considered benefits available under governmental COVID-19 relief programs, the impact of unemployment benefits initiatives, and flexible payment plans being offered to customers affected by or experiencing hardship as a result of the pandemic, which could help to mitigate the potential for increasing customer account delinquencies. Based upon this evaluation, we have concluded that the allowance for credit losses as of March 31, 2021 adequately reflected the collection risk and net realizable value for our receivables. We will continue to monitor changing circumstances and will adjust our allowance for credit losses accordingly.

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Earnings Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic EPS is computed by dividing net income available to common shareholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average shares outstanding for diluted EPS includes the incremental effects of the various long-term incentive compensation plans and an ATM forward agreement under the Treasury Stock Method when the impact would be dilutive (See Note 5 "Equity"). The computation of diluted average common shares is as follows:

	Three Months Ended
	March 31,
(in thousands)	2021	2020
Basic average common shares outstanding	392,657	383,062
Dilutive potential common shares:
Shares contingently issuable under employee stock plans	630	845
Shares restricted under employee stock plans	288	207
Forward Agreement	337	—
Diluted Average Common Shares	393,912	384,114

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Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Equity

Equity

ATM Program and Forward Sale Agreement. On February 22, 2021, we entered into six separate equity distribution agreements pursuant to which we are able to sell up to an aggregate of $750.0 million of our common stock.

On February 23, 2021, under the ATM program, we executed a forward agreement, which allows us to issue a fixed number of shares at a price to be settled in the future. From February 24, 2021 to March 17, 2021, we borrowed 6,672,740 shares from third parties, which the dealer sold at a weighted average price of $22.48 per share. We may settle this agreement in shares, cash, or net shares by December 15, 2021. Had we settled all the shares under the forward agreement at March 31, 2021, we would have received approximately $148.5 million, based on a net price of $22.25 per share.

As of March 31, 2021, the ATM program (including the impacts of the forward sale agreement discussed above) had approximately $600.0 million of equity available for issuance. The program expires on December 31, 2023.

Preferred Stock. As of March 31, 2021, we had 20,000,000 shares of preferred stock authorized for issuance, of which 440,000 shares of preferred stock in the aggregate for all series were outstanding. The following table displays preferred dividends declared for the period by outstanding series of shares:

				Three Months Ended March 31,		March 31		December 31,
				2021	2020	2021		2020
(in millions except shares and per share amounts)	Liquidation Preference Per Share		Shares	Dividends Declared Per Share		Outstanding
5.650% Series A	$	1,000.00	400,000	28.25	28.25	$	393.9	$	393.9
6.500% Series B	$	25,000.00	20,000	812.50	812.50	$	486.1	$	486.1

In addition, 20,000 shares of Series B–1 Preferred Stock, par value $0.01 per share, were outstanding as of March 31, 2021. Holders of Series B–1 Preferred Stock are not entitled to receive dividend payments and have no conversion rights. The Series B–1 Preferred Stock is paired with the Series B Preferred Stock and may not be transferred, redeemed or repurchased except in connection with the simultaneous transfer, redemption or repurchase of the underlying Series B Preferred Stock.

As of March 31, 2021 and 2020, Series A Preferred Stock had $6.7 million of cumulative preferred dividends in arrears, or $16.63 per share, and Series B Preferred Stock had $1.4 million of cumulative preferred dividends in arrears, or $72.23 per share.

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Gas in Storage	3 Months Ended
	Mar. 31, 2021
Gas in Storage [Abstract]
Gas in Storage	Gas in StorageWe use both the LIFO inventory methodology and the weighted-average cost methodology to value natural gas in storage. Gas Distribution Operations prices natural gas storage injections at the average of the costs of natural gas supply purchased during the year. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation credit or debit within the Condensed Consolidated Balance Sheets (unaudited). Due to seasonality requirements, we expect interim variances in LIFO layers to be replenished by year end. We had a temporary LIFO liquidation debit of $22.3 million and zero as of March 31, 2021 and December 31, 2020, respectively, for certain gas distribution companies recorded within “Prepayments and other,” on the Condensed Consolidated Balance Sheets (unaudited).

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Property, Plant, and Equipment

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Property, Plant and Equipment

In 2020, the MISO approved NIPSCO's plan to retire the R.M. Schahfer Generating Station in 2023. The December 2019 NIPSCO electric rate case order included approval to create a regulatory asset upon the retirement of the R.M. Schahfer Generating Station. The order allows for the recovery of and on the net book value of the station by the end of 2032.

In connection with the MISO's approval of NIPSCO's planned retirement of the R.M. Schahfer Generating Station, we recorded plant retirement-related charges during 2020 comprised of write downs of certain capital projects that have been cancelled and materials and supplies inventory balances deemed obsolete due to the planned retirement. As more information becomes available, the retirement date of the R.M. Schahfer Generating Station will be finalized, and additional plant retirement-related charges may be incurred. An immaterial amount of plant retirement-related charges were included within "Operation and maintenance" in the Condensed Statement of Consolidated Income (unaudited) during the three months ended March 31, 2021. On March 11, 2021, NIPSCO submitted modified Attachment Y Notices to MISO requesting an updated retirement date for two of the four coal fired units at R.M. Schahfer Generating Station. The two units are now expected to be retired by the end of 2021, with the remaining two units still scheduled to be retired in 2023. At retirement, the net book value of the retired units will be reclassified from "Net Property, Plant and Equipment", to current and long-term “Regulatory Assets.” The total net book value of R.M. Schahfer Generating Station's coal units and other associated plant was $861.6 million at March 31, 2021.

On April 28, 2021, in response to a Motion filed by certain parties in NIPSCO's quarterly FAC proceeding, the IURC created a sub-docket proceeding in order to receive additional information related to the planned retirements of Units 14 and 15 by the end of 2021 and any resulting cost impacts to customers. NIPSCO does not anticipate that the sub-docket proceeding will impact the planned timing of end of year 2021 for the unit retirements.

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Regulatory Matters

3 Months Ended

Mar. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Matters

Regulatory Matters

COVID-19 Regulatory Filings

In response to COVID-19, we received approvals or directives from the regulatory commissions in the states in which we operate. The ongoing impacts of these approvals or directives are described in the table below:

Jurisdiction	Moratorium in Place?	Regulatory Asset balance as of March 31, 2021 (in millions)		Deferred COVID-19 Costs
Columbia of Ohio	No	$	2.0	Incremental operation and maintenance expenses
NIPSCO	No	$	12.0	Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order
Columbia of Pennsylvania	No	$	7.1	Incremental bad debt expense incurred since March 13, 2020 above levels currently in rates
Columbia of Virginia	Yes	$	0.1	Incremental incurred costs, subject to an earnings test review
Columbia of Maryland	No	$	1.1	Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic

On March 11, 2021, the Pennsylvania PUC adopted an order, which lifted its prior pandemic-related moratorium on service terminations for non-payments of utility bills beginning April 1, 2021. Pursuant to that order, Pennsylvania utilities are required to offer payment plans on billing arrearages, with the length of such payment plans depending on customers' income levels. The longest such payment plan would be a minimum of five years for residential customers with incomes below 250% of the Federal Poverty Level.

For Columbia of Virginia, the currently effective legislative and regulatory directives related to the COVID-19 pandemic require utilities to offer payment plans between 6 and 24 months, and suspend service disconnections and late payment fees for customers. These directives will remain in place until the Governor determines that the economic and public health conditions have improved such that the prohibition does not need to be in place, or until at least 60 days after such declared state of emergency ends, whichever is sooner.

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Risk Management Activities

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Risk Management Activities

Risk Management ActivitiesWe are exposed to certain risks relating to our ongoing business operations, namely commodity price risk and interest rate risk. We recognize that the prudent and selective use of derivatives may help to lower our cost of debt capital, manage our interest rate exposure and limit volatility in the price of natural gas.

Risk management assets and liabilities on our derivatives are presented on the Condensed Consolidated Balance Sheets (unaudited) as shown below:

(in millions)	March 31, 2021		December 31, 2020
Risk Management Assets - Current(1)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	1.0		10.4
Total	$	1.0	$	10.4
Risk Management Assets - Noncurrent(2)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	3.2		2.8
Total	$	3.2	$	2.8
Risk Management Liabilities - Current(3)
Interest rate risk programs	$	17.1	$	70.9
Commodity price risk programs	5.0		7.3
Total	$	22.1	$	78.2
Risk Management Liabilities - Noncurrent(4)
Interest rate risk programs	$	40.6	$	99.5
Commodity price risk programs	38.3		45.1
Total	$	78.9	$	144.6

(1)Presented in "Prepayments and other" on the Condensed Consolidated Balance Sheets (unaudited).

(2)Presented in "Deferred charges and other" on the Condensed Consolidated Balance Sheets (unaudited).

(3)Presented in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).

(4)Presented in "Other noncurrent liabilities" on the Condensed Consolidated Balance Sheets (unaudited).

Commodity Price Risk Management

We, along with our utility customers, are exposed to variability in cash flows associated with natural gas purchases and volatility in natural gas prices. We purchase natural gas for sale and delivery to our retail, commercial and industrial customers, and for most customers the variability in the market price of gas is passed through in their rates. Some of our utility subsidiaries offer programs to certain customers whereby variability in the market price of gas is assumed by the respective utility. The objective of our commodity price risk programs is to mitigate the gas cost variability, for us or on behalf of our customers, associated with natural gas purchases or sales by economically hedging the various gas cost components using a combination of futures, options, forwards or other derivative contracts.

NIPSCO received IURC approval to lock in a fixed price for its natural gas customers using long-term forward purchase instruments. The term of these instruments may range from five to 10 years and is limited to 20% of NIPSCO’s average annual GCA purchase volume. Gains and losses on these derivative contracts are deferred as regulatory liabilities or assets and are remitted to or collected from customers through NIPSCO’s quarterly GCA mechanism. These instruments are not designated as accounting hedges.

Interest Rate Risk Management

As of March 31, 2021, we have two forward-starting interest rate swaps with an aggregate notional value totaling $500.0 million to hedge the variability in cash flows attributable to changes in the benchmark interest rate during the periods from the effective dates of the swaps to the anticipated dates of forecasted debt issuances, which are expected to take place by 2024. These interest rate swaps are designated as cash flow hedges. The gains and losses related to these swaps are recorded to AOCI and will be recognized in "Interest expense, net" concurrently with the recognition of interest expense on the associated debt, once issued. If it becomes probable that a hedged forecasted transaction will no longer occur, the accumulated gains or losses on the derivative will be recognized currently in "Other, net" in the Condensed Statements of Consolidated Income (unaudited).

There were no amounts excluded from effectiveness testing for derivatives in cash flow hedging relationships at March 31, 2021 and December 31, 2020.

Our derivative instruments measured at fair value as of March 31, 2021 and December 31, 2020 do not contain any credit-risk-related contingent features.

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Fair Value

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

A.    Fair Value Measurements

Recurring Fair Value Measurements

The following tables present financial assets and liabilities measured and recorded at fair value on our Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2021 and December 31, 2020:

Recurring Fair Value Measurements March 31, 2021 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2021
Assets
Risk management assets	$	—	$	4.2	$	—	$	4.2
Available-for-sale debt securities	—		167.9		—		167.9
Total	$	—	$	172.1	$	—	$	172.1
Liabilities
Risk management liabilities	$	—	$	101.0	$	—	$	101.0
Total	$	—	$	101.0	$	—	$	101.0

Recurring Fair Value Measurements December 31, 2020 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2020
Assets
Risk management assets	$	—	$	13.2	$	—	$	13.2
Available-for-sale debt securities	—		170.9		—		170.9
Total	$	—	$	184.1	$	—	$	184.1
Liabilities
Risk management liabilities	$	—	$	222.8	$	—	$	222.8
Total	$	—	$	222.8	$	—	$	222.8

Risk Management Assets and Liabilities. Risk management assets and liabilities include interest rate swaps, exchange-traded NYMEX futures and NYMEX options and non-exchange-based forward purchase contracts. When utilized, exchange-traded derivative contracts are based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore, nonperformance risk has not been incorporated into these valuations. Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, these instruments may utilize models to measure fair value. We use a similar model to value similar instruments. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability and market-corroborated inputs, (i.e., inputs derived principally from or corroborated by observable market data by correlation or other means). Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized within Level 2. Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized within Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements which reduce exposures. As of March 31, 2021 and December 31, 2020, there were no material transfers

between fair value hierarchies. Additionally, there were no changes in the method or significant assumptions used to estimate the fair value of our financial instruments.

Credit risk is considered in the fair value calculation of each of our forward-starting interest rate swaps, as described in Note 9, "Risk Management Activities." As they are based on observable data and valuations of similar instruments, the hedges are categorized within Level 2 of the fair value hierarchy. There was no exchange of premium at the initial date of the swaps, and we can settle the contracts at any time.

NIPSCO has entered into long-term forward natural gas purchase instruments to lock in a fixed price for its natural gas customers. We value these contracts using a pricing model that incorporates market-based information when available, as these instruments trade less frequently and are classified within Level 2 of the fair value hierarchy. For additional information, see Note 9, “Risk Management Activities.”

Available-for-Sale Debt Securities. Available-for-sale debt securities are investments pledged as collateral for trust accounts related to our wholly owned insurance company. We value U.S. Treasury, corporate debt and mortgage-backed securities using a matrix pricing model that incorporates market-based information. These securities trade less frequently and are classified within Level 2.

At each reporting date, we quantitatively and qualitatively assess available-for-sale debt securities for impairment. For securities in a loss position that we intend to hold, we perform an analysis to determine whether the unrealized loss is related to credit factors. The analysis focuses on a variety of factors that include, but are not limited to, downgrade on ratings of the security, defaults in the current reporting period or projected defaults in the future, the security's yield spread over treasuries, and other relevant market data. If the unrealized loss is not related to credit factors, it is included in other comprehensive income. If the unrealized loss is related to credit factors, the loss is recognized as credit loss expense in earnings during the period, with an offsetting entry to the allowance for credit losses. The amount of the credit loss recorded to the allowance account is limited by the amount at which the security's fair value is less than its amortized cost basis. If the credit losses in the allowance for credit losses are deemed uncollectible, the allowance on the uncollectible portion is charged off, with an offsetting entry to the carrying value of the security. Subsequent improvements to the estimated credit losses of available-for-sale debt securities are recognized immediately in earnings. As of March 31, 2021 and December 31, 2020, we recorded $0.3 million and $0.5 million, respectively, as an allowance for credit losses on available-for-sale debt securities as a result of the analysis described above. Continuous credit monitoring and portfolio credit balancing mitigates our risk of credit losses on our available-for-sale debt securities.

The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at March 31, 2021 and December 31, 2020 were: 

March 31, 2021 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(1)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	37.1	$	0.2	$	(0.3)	$	—	$	37.0
Corporate/Other debt securities	126.7		5.3		(0.8)		(0.3)		130.9
Total	$	163.8	$	5.5	$	(1.1)	$	(0.3)	$	167.9
December 31, 2020 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(2)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	33.7	$	0.3	$	—	$	—	$	34.0
Corporate/Other debt securities	130.2		7.7		(0.5)		(0.5)		136.9
Total	$	163.9	$	8.0	$	(0.5)	$	(0.5)	$	170.9

(1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $22.1 and $25.7 million, respectively, at March 31, 2021.

(2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 million and $13.2 million, respectively, at December 31, 2020.

Realized gains and losses on available-for-sale securities were immaterial for the three months ended March 31, 2021 and 2020.

The cost of maturities sold is based upon specific identification. At March 31, 2021, approximately $6.2 million of U.S. Treasury debt securities and approximately $3.9 million of Corporate/Other debt securities have maturities of less than a year.

There are no material items in the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020.

Non-recurring Fair Value Measurements

We measure the fair value of certain assets, including goodwill, on a non-recurring basis, typically annually or when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable.

In March 2021, we reached an agreement with Eversource regarding the final purchase price, including net working capital adjustments to the October 9, 2020 purchase price. The working capital amounts were measured at fair value, less costs to sell.

B.    Other Fair Value Disclosures for Financial Instruments. The carrying amount of cash and cash equivalents, restricted cash, customer deposits and short-term borrowings is a reasonable estimate of fair value due to their liquid or short-term nature. Our long-term borrowings are recorded at historical amounts.

The following method and assumptions were used to estimate the fair value of each class of financial instruments.

Long-term Debt. The fair value of outstanding long-term debt is estimated based on the quoted market prices for the same or similar securities. Certain premium costs associated with the early settlement of long-term debt are not taken into consideration in determining fair value. These fair value measurements are classified within Level 2 of the fair value hierarchy. As of March 31, 2021, there was no change in the method or significant assumptions used to estimate the fair value of long-term debt.

The carrying amount and estimated fair values of these financial instruments were as follows: 

(in millions)	Carrying Amount as of March 31, 2021		Estimated Fair Value as of March 31, 2021		Carrying Amount as of Dec. 31, 2020		Estimated Fair Value as of Dec. 31, 2020
Long-term debt (including current portion)	$	9,246.7	$	10,178.0	$	9,243.1	$	11,034.2

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Transfers Of Financial Assets

3 Months Ended

Mar. 31, 2021

Transfers and Servicing [Abstract]

Transfers Of Financial Assets

Transfers of Financial Assets

Columbia of Ohio, NIPSCO and Columbia of Pennsylvania each maintain a receivables agreement whereby they transfer their customer accounts receivables to third-party financial institutions through wholly owned and consolidated special purpose entities. The three agreements expire between August 2021 and May 2022 and may be further extended if mutually agreed to by the parties thereto.

All receivables transferred to third parties are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables transferred is determined in part by required loss reserves under the agreements.

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Condensed Consolidated Balance Sheets (unaudited). As of March 31, 2021, the maximum amount of debt that could be recognized related to our accounts receivable programs is $510.0 million.

The following table reflects the gross receivables balance and net receivables transferred, as well as short-term borrowings related to the securitization transactions as of March 31, 2021 and December 31, 2020:

(in millions)	March 31, 2021		December 31, 2020
Gross receivables	$	630.8	$	607.7
Less: Receivables not transferred	630.8		607.7
Net receivables transferred	$	—	$	—
Short-term debt due to asset securitization	$	—	$	—

For the three months ended March 31, 2021 and 2020, zero and $106.2 million, respectively, was recorded as cash flows from financing activities related to the change in short-term borrowings due to securitization transactions. Fees associated with the securitization transactions were $0.4 million and $0.7 million for the three months ended March 31, 2021 and 2020,

respectively. Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized, and the receivables cannot be transferred to another party.

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Goodwill

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill

 The following presents our goodwill balance allocated by segment as of March 31, 2021:

(in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Goodwill	$	1,485.9	$	—	$	—	$	1,485.9

For our annual goodwill impairment analysis performed as of May 1, 2020, we completed a quantitative "step 1" fair value measurement of our reporting units with a goodwill balance. This analysis incorporated the latest available income statement and cash flow projections, including significant, identifiable impacts of COVID-19 on the operations of each of our goodwill reporting units. We also incorporated other significant inputs to our fair value calculations, including discount rate and market multiples, to reflect current market conditions. The step 1 analysis performed indicated that the fair value of each reporting unit that is allocated goodwill significantly exceeded its carrying value. As a result, no impairment charge was recorded as of the May 1, 2020 test date.

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Our interim effective tax rates reflect the estimated annual effective tax rates for 2021 and 2020, adjusted for tax expense associated with certain discrete items. The effective tax rates for the three months ended March 31, 2021 and 2020 were 17.4% and (24.5)%, respectively. These effective tax rates differ from the federal statutory tax rate of 21% primarily due to increased amortization of excess deferred federal income tax liabilities, as specified in the TCJA, tax credits, state income taxes and other permanent book-to-tax differences. These adjustments have a relative impact on the effective tax rate proportionally to pretax income or loss.

The increase in the three month effective tax rate of 41.9% in 2021 compared to 2020 is primarily attributed to a discrete item related to the pre-tax book loss recorded for the classification as held for sale of the Massachusetts Business tax effected at statutory tax rates in 2020 offset by an increase in amortization of excess deferred federal income tax liabilities and deduction for AFUDC equity.

There were no material changes recorded in 2021 to our uncertain tax positions recorded as of December 31, 2020.

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Pension And Other Postretirement Benefits

3 Months Ended

Mar. 31, 2021

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Pension And Other Postretirement Benefits

Pension and Other Postretirement Benefits

We provide defined contribution plans and noncontributory defined benefit retirement plans that cover certain of our employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, we provide health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for us. The expected cost of such benefits is accrued during the employees’ years of service. We determined that, for certain rate-regulated subsidiaries, the future recovery of postretirement benefit costs is probable, and we record regulatory assets and liabilities for amounts that would otherwise have been recorded to expense or accumulated other comprehensive loss. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets and liabilities that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts.

For the three months ended March 31, 2021, we contributed $0.7 million to our pension plans and $5.1 million to our other postretirement benefit plans.

The following table provides the components of the plans’ actuarially determined net periodic benefit cost for the three months ended March 31, 2021 and 2020:

	Pension Benefits				Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2021		2020		2021		2020
Components of Net Periodic Benefit (Income) Cost(1)
Service cost	$	7.6	$	8.0	$	1.5	$	1.6
Interest cost	7.7		13.5		2.5		3.9
Expected return on assets	(25.8)		(28.4)		(3.8)		(3.6)
Amortization of prior service credit	—		0.2		(0.6)		(0.5)
Recognized actuarial loss	5.3		8.7		1.2		1.3
Settlement loss	3.3		—		—		—
Total Net Periodic Benefit (Income) Cost	$	(1.9)	$	2.0	$	0.8	$	2.7

(1)The service cost component and all non-service cost components of net periodic benefit (income) cost are presented in "Operation and maintenance" and "Other, net", respectively, on the Condensed Statements of Consolidated Income (unaudited).

During the first quarter of 2021, one of our qualified pension plans met the requirement for settlement accounting. A settlement charge of $3.3 million was recorded during the first quarter of 2021. As a result of the settlement, the pension plan was remeasured, resulting in a decrease to the net pension asset of $5.8 million, a net increase to regulatory assets of $2.1 million, and a net debit to accumulated other comprehensive loss of $0.4 million. Net periodic pension benefit cost for 2021 increased by $4.0 million as a result of the interim remeasurement.

The following table provides the key assumptions that were used to calculate the pension benefit obligation and the net periodic benefit cost at the interim remeasurement date for the plan that triggered settlement accounting:

	February 28, 2021
Weighted-average Assumption to Determine Benefit Obligation
Discount rate	2.57	%
Weighted-average Assumptions to Determine Net Periodic Benefit Costs for the period ended
Discount rate - service cost	2.81	%
Discount rate - interest cost	1.57	%
Expected return on assets	4.80	%

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Variable Interest Entities

3 Months Ended

Mar. 31, 2021

Variable Interest Entities [Abstract]

Variable Interest Entities

Variable Interest Entities

A VIE is an entity in which the controlling interest is determined through means other than a majority voting interest. The primary beneficiary of a VIE is the business enterprise which has the power to direct the activities that most significantly impact the VIE’s economic performance. Also, the primary beneficiary either absorbs a significant amount of the VIE’s losses or has the right to receive benefits that could be significant to the VIE. We consider these qualitative elements in determining whether we are the primary beneficiary of a VIE, and we consolidate those VIEs for which we are determined to be the primary beneficiary.

Rosewater (a joint venture) owns and operates 102 MW of nameplate capacity wind generation assets. Members of the joint venture are NIPSCO (who is the managing member) and a tax equity partner. Earnings, tax attributes and cash flows are allocated to both NIPSCO and the tax equity partner in varying percentages by category and over the life of the partnership. Once the tax equity partner has earned their negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value from the tax equity partner the remaining interest in the aforementioned joint venture. NIPSCO has an obligation to purchase, through a PPA at established market rates, 100% of the electricity generated by Rosewater.

As the managing member of Rosewater, we control decisions that are significant to its ongoing operations and economic results. Therefore, we have concluded that we are the primary beneficiary of Rosewater and have consolidated Rosewater even though we own less than 100% of the total equity membership interest.

We have determined that the use of HLBV accounting is reasonable and appropriate in order to attribute income and loss to the noncontrolling interest held by the tax equity partner. HLBV accounting was selected as the allocation of Rosewater's economic results to members differ from the members' relative ownership percentages. Using the HLBV method, our earnings are calculated based on how the partnership would distribute its cash if it were to hypothetically sell all of its assets for their carrying amounts and liquidate at each reporting period. Under HLBV, we calculate the liquidation value allocable to each partner at the beginning and end of each period based on the contractual terms of the related entity's operating agreement and adjust our income for the period to reflect the change in our associated book value.

In March 2021, in exchange for additional respective membership interests in Rosewater, NIPSCO contributed $0.1 million in cash, and the tax equity partner contributed $7.5 million in cash, the second of two contractual cash contributions for each partner, per the equity capital contribution agreement. NIPSCO also assumed an additional obligation of $6.0 million to the developer, which comes due in 2023 and is included in "Other noncurrent liabilities" in the Condensed Consolidated Balance Sheets (unaudited). From the contributed funds, Rosewater paid $7.4 million to the developer of the wind generation assets. The developer of the facility is not a partner in the joint venture for federal income tax purposes and does not receive any share of earnings, tax attributes, or cash flows of Rosewater. With asset construction now complete, NIPSCO and the tax equity partner have made total cash contributions of $0.8 million and $93.6 million, respectively, and NIPSCO has assumed an obligation to the developer of $75.7 million, totaling contributions of $170.1 million for both partners. We did not provide any financial or other support during the year that was not previously contractually required, nor do we expect to provide such support in the future.

At March 31, 2021 and December 31, 2020, $170.0 million and $156.4 million, respectively, in net assets (as detailed in the table below) related to Rosewater and the non-controlling interest attributable to the unrelated tax equity partner of $94.1 million and $85.6 million, respectively, were included in the Condensed Consolidated Balance Sheets (unaudited). For the quarters ended March 31, 2021 and 2020, $1.0 million and zero were allocated to the tax equity partner and is included in "Net income attributable to non-controlling interest" on the Condensed Statements of Consolidated Income.

Our Condensed Consolidated Balance Sheets (unaudited) included the following assets and liabilities associated with Rosewater:

(in millions)	March 31, 2021		December 31, 2020
Net Property, Plant and Equipment	$	174.2	$	175.6
Current assets	4.2		1.7
Total assets(1)	$	178.4	$	177.3
Current liabilities	$	2.8	$	15.3
Asset retirement obligations	5.5		5.5
Other noncurrent liabilities	0.1		0.1
Total liabilities	$	8.4	$	20.9

(1)The assets of Rosewater represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE.

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Short-Term Borrowings

3 Months Ended

Mar. 31, 2021

Short-term Debt [Abstract]

Short-Term Borrowings

Short-Term Borrowings

We generate short-term borrowings from our revolving credit facility, commercial paper program and accounts receivable transfer programs. Each of these borrowing sources is described further below.

We maintain a revolving credit facility to fund ongoing working capital requirements, including the provision of liquidity support for our commercial paper program, provide for issuance of letters of credit and also for general corporate purposes. Our revolving credit facility has a program limit of $1.85 billion and is comprised of a syndicate of banks led by Barclays. We had no outstanding borrowings under this facility as of March 31, 2021 and December 31, 2020.

Our commercial paper program has a program limit of up to $1.5 billion with a dealer group comprised of Barclays, Citigroup, Credit Suisse and Wells Fargo. We had $520.0 million of commercial paper outstanding as of March 31, 2021 and $503.0 million of commercial paper outstanding as of December 31, 2020.

Refer to Note 11, "Transfers of Financial Assets," for additional information on our accounts receivable transfer programs.

Short-term borrowings were as follows: 

(in millions)	March 31, 2021		December 31, 2020
Commercial paper weighted-average interest rate of 0.19% and 0.27% at March 31, 2021 and December 31, 2020, respectively	520.0		503.0
Total Short-Term Borrowings	$	520.0	$	503.0

Items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited) as their maturities are less than 90 days.

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Other Commitments And Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Other Commitments and Contingencies

A. Guarantees and Indemnities. We and certain of our subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries as a part of normal business. Such agreements include guarantees and stand-by letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiaries’ intended commercial purposes. As of March 31, 2021 and December 31, 2020, we had issued stand-by letters of credit of $15.2 million.

We provide guarantees related to our future performance under BTAs for our renewable generation projects. At March 31, 2021, our guarantees for the Rosewater and Indiana Crossroads BTAs totaled $34.0 million. The amount of each guaranty will fluctuate upon the completion of the various steps outlined in each BTA. See “- D. Other Matters - Generation Transition,” below for more information.

 B. Legal Proceedings. On September 13, 2018, a series of fires and explosions occurred in Lawrence, Andover and North Andover, Massachusetts related to the delivery of natural gas by Columbia of Massachusetts (the "Greater Lawrence Incident"). The Greater Lawrence Incident resulted in one fatality and a number of injuries, damaged multiple homes and businesses, and caused the temporary evacuation of significant portions of each municipality. The Massachusetts Governor’s Office declared a state of emergency, authorizing the Massachusetts DPU to order another utility company to coordinate the restoration of utility services in Lawrence, Andover and North Andover. The incident resulted in the interruption of gas for approximately 7,500 gas meters, the majority of which served residences and approximately 700 of which served businesses, and the interruption of other utility service more broadly in the area. Columbia of Massachusetts replaced the cast iron and bare steel gas pipeline system in the affected area and restored service. See “- D. Other Matters - Greater Lawrence Pipeline Replacement” below for more information. On September 1, 2020, the Massachusetts Governor terminated the state of emergency declared following the Greater Lawrence Incident.

We have been subject to inquiries and investigations by government authorities and regulatory agencies regarding the Greater Lawrence Incident, including the Massachusetts DPU and the Massachusetts Attorney General's Office. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney’s Office for the District of Massachusetts to resolve the U.S. Attorney’s Office’s investigation relating to the Greater Lawrence Incident, as described below. The Company and Columbia of Massachusetts entered into an agreement with the Massachusetts Attorney General’s Office (among other parties) to resolve the Massachusetts DPU and the Massachusetts Attorney General’s Office investigations, that was approved by the Massachusetts DPU on October 7, 2020 as part of the sale of the Massachusetts Business to Eversource.

NTSB Investigation. As previously disclosed, the NTSB concluded its investigation into the Greater Lawrence Incident. On November 24, 2020, the NTSB closed NiSource’s one remaining open safety recommendation.

U.S. Department of Justice Investigation. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney’s Office to resolve the U.S. Attorney’s Office’s investigation relating to the Greater Lawrence Incident. Columbia of Massachusetts agreed to plead guilty in the United States District Court for the District of Massachusetts (the “Court”) to violating the Natural Gas Pipeline Safety Act (the “Plea Agreement”), and the Company entered into a Deferred Prosecution Agreement (the “DPA”).

On March 9, 2020, Columbia of Massachusetts entered its guilty plea pursuant to the Plea Agreement, which the Court accepted. Subsequently, Columbia of Massachusetts and the U.S. Attorney’s Office modified the Plea Agreement. On June 23, 2020, the Court sentenced Columbia of Massachusetts in accordance with the terms of the modified Plea Agreement. Under the modified Plea Agreement, Columbia of Massachusetts is subject to the following terms, among others: (i) a criminal fine in the amount of $53,030,116, which has been paid; (ii) a three year probationary period that will terminate early upon a sale of Columbia of Massachusetts or a sale of its gas distribution business to a qualified third-party buyer consistent with certain requirements, but in no event before the end of the one-year mandatory period of probation; (iii) compliance with each of the NTSB recommendations stemming from the Greater Lawrence Incident; and (iv) employment of an in-house monitor until the end of the term of probation or until the sale of Columbia of Massachusetts or its gas distribution business, whichever is earlier. On October 13, 2020, the Court, upon agreement of the U.S. Attorney's Office and Columbia Gas of Massachusetts, modified the terms of probation by ending the term of the in-house monitor.

Under the DPA, the U.S. Attorney’s Office agreed to defer prosecution of the Company in connection with the Greater Lawrence Incident for a three-year period (which three-year period may be extended for twelve (12) months upon the U.S. Attorney’s Office’s determination of a breach of the DPA) subject to certain obligations of the Company, including, but not limited to, the following: (i) the Company will use reasonable best efforts to sell Columbia of Massachusetts or Columbia of Massachusetts’ gas distribution business to a qualified third-party buyer consistent with certain requirements, and, upon the completion of any such sale, the Company will cease and desist any and all gas pipeline and distribution activities in the District of Massachusetts; (ii) the Company will forfeit and pay, within 30 days of the later of the sale becoming final or the date on which post-closing adjustments to the purchase price are finally determined in accordance with the agreement to sell Columbia of Massachusetts or its gas distribution business, a fine equal to the total amount of the profit or gain, if any, from any sale of Columbia of Massachusetts or its gas distribution business, with the amount of profit or gain determined as provided in the DPA; and (iii) the Company agrees as to each of the Company’s subsidiaries involved in the distribution of gas through pipeline facilities in Massachusetts, Indiana, Ohio, Pennsylvania, Maryland, Kentucky and Virginia to implement and adhere to each of the recommendations from the NTSB stemming from the Greater Lawrence Incident. Pursuant to the DPA, if the Company complies with all of its obligations under the DPA, including, but not limited to those identified above, the U.S. Attorney’s Office will not file any criminal charges against the Company related to the Greater Lawrence Incident. If Columbia of Massachusetts withdraws its plea for any reason, if the Court rejects any aspect of the Plea Agreement, or if Columbia of Massachusetts should fail to perform an obligation under the Plea Agreement prior to the sale of Columbia of Massachusetts or its gas distribution business, the U.S. Attorney's Office may, at its sole option, render the DPA null and void. The sale of the Massachusetts Business was completed on October 9, 2020. The Company was not required to forfeit or pay any funds because the Company did not realize a profit or gain from the sale as provided in the DPA.

Private Actions. Various lawsuits, including several purported class action lawsuits, have been filed by various affected residents or businesses in Massachusetts state courts against the Company and/or Columbia of Massachusetts in connection with the Greater Lawrence Incident.

On July 26, 2019, the Company, Columbia of Massachusetts and NiSource Corporate Services Company, a subsidiary of the Company, entered into a term sheet with the class action plaintiffs under which they agreed to settle the class action claims in connection with the Greater Lawrence Incident. Columbia of Massachusetts agreed to pay $143 million into a settlement fund to compensate the settlement class and the settlement class agreed to release Columbia of Massachusetts and affiliates from all claims arising out of or related to the Greater Lawrence Incident. The following claims are not covered under the proposed settlement because they are not part of the consolidated class action: (1) physical bodily injury and wrongful death; (2) insurance subrogation, whether equitable, contractual or otherwise; and (3) claims arising out of appliances that are subject to the Massachusetts DPU orders. Emotional distress and similar claims are covered under the proposed settlement unless they are secondary to a physical bodily injury. The settlement class is defined under the term sheet as all persons and businesses in the three municipalities of Lawrence, Andover and North Andover, Massachusetts, subject to certain limited exceptions. The motion for preliminary approval and the settlement documents were filed on September 25, 2019. The preliminary approval court hearing was held on October 7, 2019 and the court issued an order granting preliminary approval of the settlement on October 11, 2019. The Court granted final approval of the settlement on March 12, 2020.

With respect to claims not included in the consolidated class action, many of the asserted wrongful death and bodily injury claims have settled, and we continue to discuss potential settlements with remaining claimants. The outcomes and impacts of such private actions are uncertain at this time.

Shareholder Derivative Lawsuit. On April 28, 2020, a shareholder derivative lawsuit was filed by the City of Detroit Police and Fire Retirement System in the United States District Court for the District of Delaware against certain of the Company’s

current and former directors, alleging state-law claims for breaches of fiduciary duty with respect to the pipeline safety management systems relating to the distribution of natural gas prior to the Greater Lawrence Incident and also including federal-law claims related to our proxy statement disclosures regarding our safety systems. The remedies sought included damages for the alleged breaches of fiduciary duty, corporate governance reforms, and restitution of any unjust enrichment. The defendants filed a motion to dismiss the lawsuit, and oral argument was held on March 2, 2021. On March 9, 2021, the district court granted the defendants’ motion to dismiss. It dismissed the federal-law claims with prejudice for failure to state a claim on which relief can be granted and declined to exercise jurisdiction over the state-law claims, which were dismissed without prejudice.

Following the dismissal of the federal court action, on April 29, 2021, the same plaintiff filed a shareholder derivative lawsuit in the Delaware Court of Chancery against certain of our current and former directors. The new complaint alleges a single count for breach of fiduciary duty, and no longer alleges disclosure violations or breaches of federal securities laws. The complaint relates to substantially the same matters as those alleged in the dismissed federal derivative complaint. The remedies sought include damages for the alleged breaches of fiduciary duty, corporate governance reforms, and restitution of compensation by the individual defendants. The case is at an early stage, and a schedule has not yet been entered. Because of the preliminary nature of this lawsuit, we are not able to estimate a loss or range of loss, if any, that may be incurred in connection with this matter at this time.

Financial Impact. Since the Greater Lawrence Incident, we have recorded expenses of approximately $1,040 million for third-party claims and fines, penalties and settlements associated with government investigations. These costs do not include the capital cost of the pipeline replacement. Refer to " - D. Other Matters - Greater Lawrence Incident Restoration," and "- Greater Lawrence Incident Pipeline Replacement," for additional information.

The process for estimating costs associated with third-party claims relating to the Greater Lawrence Incident requires management to exercise significant judgment based on a number of assumptions and subjective factors. As more information becomes known, management’s estimates and assumptions regarding the financial impact of the Greater Lawrence Incident may change.

We are also party to certain other claims, regulatory and legal proceedings arising in the ordinary course of business in each state in which we have operations, none of which we believe to be individually material at this time.

Due to the inherent uncertainty of litigation, there can be no assurance that the outcome or resolution of any particular claim, proceeding or investigation related to the Greater Lawrence Incident or otherwise would not have a material adverse effect on our results of operations, financial position or liquidity. Certain matters in connection with the Greater Lawrence Incident have had or may have a material impact as described above. If one or more of such additional or other matters were decided against us, the effects could be material to our results of operations in the period in which we would be required to record or adjust the related liability and could also be material to our cash flows in the periods that we would be required to pay such liability.

C. Environmental Matters. Our operations are subject to environmental statutes and regulations related to air quality, water quality, hazardous waste and solid waste. We believe that we are in substantial compliance with the environmental regulations currently applicable to our operations.

It is management's continued intent to address environmental issues in cooperation with regulatory authorities in such a manner as to achieve mutually acceptable compliance plans. However, there can be no assurance that fines and penalties will not be incurred. Management expects a majority of environmental assessment and remediation costs to be recoverable through rates for certain of our companies.

As of March 31, 2021 and December 31, 2020, we had recorded a liability of $90.6 million and $92.6 million, respectively, to cover environmental remediation at various sites. The current portion of this liability is included in "Other accruals" in the Condensed Consolidated Balance Sheets (unaudited). The noncurrent portion is included in "Other noncurrent liabilities." We recognize costs associated with environmental remediation obligations when the incurrence of such costs is probable and the amounts can be reasonably estimated. The original estimates for remediation activities may differ materially from the amount ultimately expended. The actual future expenditures depend on many factors, including laws and regulations, the nature and extent of impact and the method of remediation. These expenditures are not currently estimable at some sites. We periodically adjust our liability as information is collected and estimates become more refined.

CERCLA. Our subsidiaries are potentially responsible parties at waste disposal sites under the CERCLA (commonly known as Superfund) and similar state laws. Under CERCLA, each potentially responsible party can be held jointly, severally and strictly liable for the remediation costs as the EPA, or state, can allow the parties to pay for remedial action or perform remedial action themselves and request reimbursement from the potentially responsible parties. Our affiliates have retained CERCLA environmental liabilities, including remediation liabilities, associated with certain current and former operations. These liabilities are not material to the Condensed Consolidated Financial Statements (unaudited).

MGP. We maintain a program to identify and investigate former MGP sites where Gas Distribution Operations subsidiaries or predecessors may have liability. The program has identified 54 such sites where liability is probable. Remedial actions at many of these sites are being overseen by state or federal environmental agencies through consent agreements or voluntary remediation agreements.

We utilize a probabilistic model to estimate our future remediation costs related to MGP sites. The model was prepared with the assistance of a third party and incorporates our experience and general industry experience with remediating MGP sites. We complete an annual refresh of the model in the second quarter of each fiscal year. No material changes to the estimated future remediation costs were noted as a result of the refresh completed as of June 30, 2020. Our total estimated liability related to the facilities subject to remediation was $84.3 million and $85.0 million at March 31, 2021 and December 31, 2020, respectively. The liability represents our best estimate of the probable cost to remediate the MGP sites. We believe that it is reasonably possible that remediation costs could vary by as much as $20 million in addition to the costs noted above. Remediation costs are estimated based on the best available information, applicable remediation standards at the balance sheet date and experience with similar facilities.

CCRs. On April 17, 2015, the EPA issued a final rule for regulation of CCRs. The rule regulates CCRs under the RCRA Subtitle D, which determines them to be nonhazardous. The rule is implemented in phases and requires increased groundwater monitoring, reporting, recordkeeping and posting of related information to the Internet. The rule also establishes requirements related to CCR management and disposal. The rule allows NIPSCO to continue its byproduct beneficial use program.

To comply with the rule, NIPSCO completed capital expenditures in 2019 to modify its infrastructure and manage CCRs. The CCR rule also resulted in revisions to previously recorded legal obligations associated with the retirement of certain NIPSCO facilities. The actual asset retirement costs related to the CCR rule may vary substantially from the estimates used to record the increased asset retirement obligation due to the uncertainty about the requirements that will be established by environmental authorities, compliance strategies that will be used and the preliminary nature of available data used to estimate costs. As allowed by the rule, NIPSCO will continue to collect data over time to determine the specific compliance solutions and associated costs and, as a result, the actual costs may vary. NIPSCO will also continue to work with EPA and the Indiana Department of Environmental Management to obtain administrative approvals associated with the CCR rule. In the event that the approvals are not obtained, future operations could be impacted. We believe the possibility of such an outcome is remote.

D. Other Matters.

Generation Transition. NIPSCO has executed several PPAs to purchase 100% of the output from renewable generation facilities at a fixed price per MWh. Each facility supplying the energy will have an associated nameplate capacity, and payments under the PPAs will not begin until the associated generation facility is constructed by the owner/seller. NIPSCO has also executed several BTAs with developers to construct renewable generation facilities. NIPSCO's purchase requirement under the BTAs is dependent on satisfactory approval of the BTA by the IURC, successful execution of an agreement with a tax equity partner and timely completion of construction. NIPSCO and the tax equity partner are obligated to make cash contributions to the partnership at the date construction is substantially complete. Once the tax equity partner has earned their negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value from the tax equity partner the remaining interest in the aforementioned joint venture.

Greater Lawrence Incident Restoration. In addition to the amounts estimated for third-party claims and fines, penalties and settlements associated with government investigations described above, we have recorded expenses for other incident-related costs. Such costs include certain consulting costs, legal costs, vendor costs, claims center costs, labor and related expenses incurred in connection with the incident, and insurance-related loss surcharges. These costs were immaterial for the three months ended March 31, 2021.

Greater Lawrence Pipeline Replacement. In connection with the Greater Lawrence Incident, Columbia of Massachusetts, in cooperation with the Massachusetts Governor’s office, replaced the entire affected pipeline system. We invested approximately $258 million of capital spend for the pipeline replacement; this work was completed in 2019. We maintain property insurance

for gas pipelines and other applicable property. Columbia of Massachusetts has filed a proof of loss with its property insurer for the pipeline replacement. In January 2020, we filed a lawsuit against the property insurer, seeking payment of our property claim. We are currently unable to predict the timing or amount of any insurance recovery under the property policy.

State Income Taxes Related to Greater Lawrence Incident Expenses. As of December 31, 2018, expenses related to the Greater Lawrence Incident were $1,023 million. In the fourth quarter of 2019, we filed an application for Alternative Apportionment with the MA DOR to request an allocable approach to these expenses for purposes of Massachusetts state income taxes, which, if approved, would result in a state deferred tax asset of approximately $50 million, net. The MA DOR issued a denial during the first quarter of 2020. We filed an application for abatement in the second quarter of 2020, which resulted in a denial from the MA DOR in April 2021. We have 60 days to submit an appeal for this decision.

One-Time Employee Separation Benefits. On August 5, 2020, we commenced a voluntary separation program for certain employees. Expense for the voluntary separation program was predominantly recognized in the third quarter of 2020, when the employees accepted the offer, absent a retention period. In addition, we have continued to evaluate our organizational structure under the auspices of NiSource Next, which has resulted in additional separations under our existing severance policies. For employees that have a retention period, expense will be recognized over the remaining service period. The total estimated severance expense for employees is approximately $40 million, with $38.1 million incurred to date. A rollforward of the one-time employee separation benefits accrual for the three months ended March 31, 2021 is presented below:

(in millions)	Balance as of January 1, 2021	Changes Attributable to Costs Incurred(1)	Costs Paid	Adjustments	Balance as of March 31, 2021(2)
One-time Employee Separation Benefits	11.1	4.6	(8.4)	—	7.3

(1)This activity is presented within "Operation and maintenance" in our Condensed Statements of Consolidated Income (unaudited).

(2)This activity is presented within "Accrued compensation and employee benefits" in our Condensed Consolidated Balance Sheets (unaudited).

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2021

Other Comprehensive Income (Loss), Tax [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

The following tables display the components of Accumulated Other Comprehensive Loss:

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2021	$	6.0	$	(147.9)	$	(14.8)	$	(156.7)
Other comprehensive income (loss) before reclassifications	(2.2)		84.6		(1.4)		81.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)		—		0.5		0.2
Net current-period other comprehensive income (loss)	(2.5)		84.6		(0.9)		81.2
Balance as of March 31, 2021	$	3.5	$	(63.3)	$	(15.7)	$	(75.5)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2020	$	3.3	$	(77.2)	$	(18.7)	$	(92.6)
Other comprehensive income (loss) before reclassifications	(5.2)		(133.3)		0.4		(138.1)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		—		0.3		0.1
Net current-period other comprehensive income (loss)	(5.4)		(133.3)		0.7		(138.0)
Balance as of March 31, 2020	$	(2.1)	$	(210.5)	$	(18.0)	$	(230.6)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

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Other, Net

3 Months Ended

Mar. 31, 2021

Other, Net [Abstract]

Other, Net

Other, Net

Three Months Ended March 31, (in millions)	2021		2020
Interest income	$	0.9	$	1.7
AFUDC equity	1.5		1.7
Pension and other postretirement non-service benefit	8.5		2.7
Miscellaneous	(0.4)		(0.7)
Total Other, net	$	10.5	$	5.4

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Business Segment Information

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Business Segment Information

Business Segment Information

At March 31, 2021, our operations are divided into two primary reportable segments, the Gas Distribution Operations and Electric Operations segments. Corporate costs and other activities that are not significant on a stand-alone basis to warrant treatment as an operating segment and that do not fit into one of our two segments are aggregated as "Corporate and Other" in the disclosures below. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues.

The following table provides information about our business segments. We use operating income as our primary measurement for each of the reported segments and make decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.

	Three Months Ended March 31,
(in millions)	2021		2020
Operating Revenues
Gas Distribution Operations
Unaffiliated	$	1,135.8	$	1,228.0
Intersegment	3.1		3.0
Total	1,138.9		1,231.0
Electric Operations
Unaffiliated	402.5		377.3
Intersegment	0.2		0.2
Total	402.7		377.5
Corporate and Other
Unaffiliated	7.3		0.2
Intersegment	103.9		106.7
Total	111.2		106.9
Eliminations	(107.2)		(109.9)
Consolidated Operating Revenues	$	1,545.6	$	1,605.5
Operating Income (Loss)
Gas Distribution Operations	$	346.9	$	78.5
Electric Operations	87.9		78.5
Corporate and Other	(1.6)		(8.8)
Consolidated Operating Income	$	433.2	$	148.2

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Subsequent Event	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn April 19, 2021, we completed the sale of 8.625 million Series A Equity Units (“Equity Units”), initially consisting of Series A Corporate Units (“Corporate Units”), each with a stated amount of $100. The offering generated net proceeds of $835.5 million, after underwriting and estimated issuance expenses. Each Corporate Unit consists of a forward contract to purchase shares of our common stock in the future and a 1/10th, or 10%, undivided beneficial ownership interest in one share of Series C Mandatory Convertible Preferred Stock, par value $0.01 per share, with a liquidation preference of $1,000 per share. The Mandatory Convertible Preferred Stock initially will not bear any dividends. Total annual distributions of the Corporate Units will be 7.75%, consisting of quarterly contract adjustment payments under the forward contract. We may pay the contract adjustment payments in cash, shares of common stock or a combination of cash and shares of common stock, at our election.

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Recent Accounting Pronouncements (Tables)

3 Months Ended

Mar. 31, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

Description of New Accounting Pronouncements Not yet Adopted

Recently Issued Accounting Pronouncements

We are currently evaluating the impact of certain ASUs on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited), which are described below:

Standard	Description	Effective Date	Effect on the financial statements or other significant matters
ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Statement	This pronouncement provides temporary optional expedients and exceptions for applying GAAP principles to contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates.	Upon issuance on March 12, 2020, and will apply though December 31, 2022.	We continue to evaluate the temporary expedients and options available under this guidance, and the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited). We are currently identifying and evaluating contracts that may be impacted. As of March 31, 2021, we have not applied any expedients and options available under this ASU.
ASU 2021-01, Reference Rate Reform (Topic 848): Scope
ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivative and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity	This pronouncement simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity's own equity. Specifically, the ASU "simplifies accounting for convertible instruments by removing major separation models required under current GAAP." In addition, the ASU "removes certain settlement conditions that are required for equity contracts to qualify for it" and "simplifies the diluted earnings per share (EPS) calculations in certain areas."	Annual period beginning after December 15, 2021, and interim periods within those fiscal years.	We continue to evaluate the effects of this pronouncement on our Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited) as it pertains to any relevant future activity. We expect to adopt this ASU on its effective date.

Schedule of Prospective Adoption of New Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Standard

Adoption

ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes

This pronouncement simplifies the accounting for income taxes by eliminating certain exceptions to the general principles in ASC 740, income taxes. It also improves consistency of application for other areas of the guidance by clarifying and amending existing guidance. We adopted the amendments of this pronouncement as of January 1, 2021 with no material impact to the Condensed Consolidated Financial Statements (unaudited).

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Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Condensed Statements of Consolidated Income (unaudited) for the three months ended March 31, 2021 and March 31, 2020:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other(2)		Total
Customer Revenues(1)
Residential	$	773.5	$	129.2	$	—	$	902.7
Commercial	271.4		122.9		—		394.3
Industrial	57.9		122.9		—		180.8
Off-system	14.4		—		—		14.4
Miscellaneous	9.9		4.2		0.2		14.3
Total Customer Revenues	$	1,127.1	$	379.2	$	0.2	$	1,506.5
Other Revenues	8.7		23.3		7.1		39.1
Total Operating Revenues	$	1,135.8	$	402.5	$	7.3	$	1,545.6

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

(2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.

Three Months Ended March 31, 2020 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Customer Revenues(1)
Residential	$	796.5	$	119.2	$	—	$	915.7
Commercial	269.4		120.2		—		389.6
Industrial	74.2		109.1		—		183.3
Off-system	18.7		—		—		18.7
Miscellaneous	12.5		5.9		0.2		18.6
Total Customer Revenues	$	1,171.3	$	354.4	$	0.2	$	1,525.9
Other Revenues	56.7		22.9		—		79.6
Total Operating Revenues	$	1,228.0	$	377.3	$	0.2	$	1,605.5

(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.

Customer Accounts Receivable

The opening and closing balances of customer receivables for the three months ended March 31, 2021 are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.

(in millions)	Customer Accounts Receivable, Billed (less reserve)		Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020	$	400.0	$	327.2
Balance as of March 31, 2021	507.4		244.3
Increase (Decrease)	$	107.4	$	(82.9)

Financing Receivable, Allowance for Credit Loss

A rollforward of our allowance for credit losses for the three months ended March 31, 2021 are presented in the table below:

Three Months Ended March 31, 2021 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Beginning balance	$	41.8	$	9.7	$	0.8	$	52.3
Current period provisions	5.9		2.9		—		8.8
Write-offs charged against allowance	(9.0)		(2.4)		—		(11.4)
Recoveries of amounts previously written off	4.1		0.1		—		4.2
Ending balance of the allowance for credit losses	$	42.8	$	10.3	$	0.8	$	53.9

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Computation Of Diluted Average Common Shares

The computation of diluted average common shares is as follows:

	Three Months Ended
	March 31,
(in thousands)	2021	2020
Basic average common shares outstanding	392,657	383,062
Dilutive potential common shares:
Shares contingently issuable under employee stock plans	630	845
Shares restricted under employee stock plans	288	207
Forward Agreement	337	—
Diluted Average Common Shares	393,912	384,114

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Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of Stock by Class - Preferred

The following table displays preferred dividends declared for the period by outstanding series of shares:

				Three Months Ended March 31,		March 31		December 31,
				2021	2020	2021		2020
(in millions except shares and per share amounts)	Liquidation Preference Per Share		Shares	Dividends Declared Per Share		Outstanding
5.650% Series A	$	1,000.00	400,000	28.25	28.25	$	393.9	$	393.9
6.500% Series B	$	25,000.00	20,000	812.50	812.50	$	486.1	$	486.1

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Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of COVID-19 Regulatory Impact

The ongoing impacts of these approvals or directives are described in the table below:

Jurisdiction	Moratorium in Place?	Regulatory Asset balance as of March 31, 2021 (in millions)		Deferred COVID-19 Costs
Columbia of Ohio	No	$	2.0	Incremental operation and maintenance expenses
NIPSCO	No	$	12.0	Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order
Columbia of Pennsylvania	No	$	7.1	Incremental bad debt expense incurred since March 13, 2020 above levels currently in rates
Columbia of Virginia	Yes	$	0.1	Incremental incurred costs, subject to an earnings test review
Columbia of Maryland	No	$	1.1	Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic

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Risk Management Activities (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

Risk management assets and liabilities on our derivatives are presented on the Condensed Consolidated Balance Sheets (unaudited) as shown below:

(in millions)	March 31, 2021		December 31, 2020
Risk Management Assets - Current(1)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	1.0		10.4
Total	$	1.0	$	10.4
Risk Management Assets - Noncurrent(2)
Interest rate risk programs	$	—	$	—
Commodity price risk programs	3.2		2.8
Total	$	3.2	$	2.8
Risk Management Liabilities - Current(3)
Interest rate risk programs	$	17.1	$	70.9
Commodity price risk programs	5.0		7.3
Total	$	22.1	$	78.2
Risk Management Liabilities - Noncurrent(4)
Interest rate risk programs	$	40.6	$	99.5
Commodity price risk programs	38.3		45.1
Total	$	78.9	$	144.6

(1)Presented in "Prepayments and other" on the Condensed Consolidated Balance Sheets (unaudited).

(2)Presented in "Deferred charges and other" on the Condensed Consolidated Balance Sheets (unaudited).

(3)Presented in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).

(4)Presented in "Other noncurrent liabilities" on the Condensed Consolidated Balance Sheets (unaudited).

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

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

The following tables present financial assets and liabilities measured and recorded at fair value on our Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2021 and December 31, 2020:

Recurring Fair Value Measurements March 31, 2021 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2021
Assets
Risk management assets	$	—	$	4.2	$	—	$	4.2
Available-for-sale debt securities	—		167.9		—		167.9
Total	$	—	$	172.1	$	—	$	172.1
Liabilities
Risk management liabilities	$	—	$	101.0	$	—	$	101.0
Total	$	—	$	101.0	$	—	$	101.0

Recurring Fair Value Measurements December 31, 2020 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2020
Assets
Risk management assets	$	—	$	13.2	$	—	$	13.2
Available-for-sale debt securities	—		170.9		—		170.9
Total	$	—	$	184.1	$	—	$	184.1
Liabilities
Risk management liabilities	$	—	$	222.8	$	—	$	222.8
Total	$	—	$	222.8	$	—	$	222.8

Schedule of Available-For-Sale Securities

The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at March 31, 2021 and December 31, 2020 were: 

March 31, 2021 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(1)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	37.1	$	0.2	$	(0.3)	$	—	$	37.0
Corporate/Other debt securities	126.7		5.3		(0.8)		(0.3)		130.9
Total	$	163.8	$	5.5	$	(1.1)	$	(0.3)	$	167.9
December 31, 2020 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses(2)		Allowance for Credit Losses		Fair Value
Available-for-sale debt securities
U.S. Treasury debt securities	$	33.7	$	0.3	$	—	$	—	$	34.0
Corporate/Other debt securities	130.2		7.7		(0.5)		(0.5)		136.9
Total	$	163.9	$	8.0	$	(0.5)	$	(0.5)	$	170.9

(1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $22.1 and $25.7 million, respectively, at March 31, 2021.

(2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 million and $13.2 million, respectively, at December 31, 2020.

Carrying Amount And Estimated Fair Values Of Financial Instruments

The carrying amount and estimated fair values of these financial instruments were as follows: 

(in millions)	Carrying Amount as of March 31, 2021		Estimated Fair Value as of March 31, 2021		Carrying Amount as of Dec. 31, 2020		Estimated Fair Value as of Dec. 31, 2020
Long-term debt (including current portion)	$	9,246.7	$	10,178.0	$	9,243.1	$	11,034.2

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Transfers Of Financial Assets (Tables)

3 Months Ended

Mar. 31, 2021

Transfers and Servicing [Abstract]

Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions

The following table reflects the gross receivables balance and net receivables transferred, as well as short-term borrowings related to the securitization transactions as of March 31, 2021 and December 31, 2020:

(in millions)	March 31, 2021		December 31, 2020
Gross receivables	$	630.8	$	607.7
Less: Receivables not transferred	630.8		607.7
Net receivables transferred	$	—	$	—
Short-term debt due to asset securitization	$	—	$	—

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Goodwill (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following presents our goodwill balance allocated by segment as of March 31, 2021:

(in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Goodwill	$	1,485.9	$	—	$	—	$	1,485.9

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Pension And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2021

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Components Of The Plans' Net Periodic Benefits Cost

The following table provides the components of the plans’ actuarially determined net periodic benefit cost for the three months ended March 31, 2021 and 2020:

	Pension Benefits				Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2021		2020		2021		2020
Components of Net Periodic Benefit (Income) Cost(1)
Service cost	$	7.6	$	8.0	$	1.5	$	1.6
Interest cost	7.7		13.5		2.5		3.9
Expected return on assets	(25.8)		(28.4)		(3.8)		(3.6)
Amortization of prior service credit	—		0.2		(0.6)		(0.5)
Recognized actuarial loss	5.3		8.7		1.2		1.3
Settlement loss	3.3		—		—		—
Total Net Periodic Benefit (Income) Cost	$	(1.9)	$	2.0	$	0.8	$	2.7

(1)The service cost component and all non-service cost components of net periodic benefit (income) cost are presented in "Operation and maintenance" and "Other, net", respectively, on the Condensed Statements of Consolidated Income (unaudited).

Schedule of Defined Benefit Plans Disclosures

The following table provides the key assumptions that were used to calculate the pension benefit obligation and the net periodic benefit cost at the interim remeasurement date for the plan that triggered settlement accounting:

	February 28, 2021
Weighted-average Assumption to Determine Benefit Obligation
Discount rate	2.57	%
Weighted-average Assumptions to Determine Net Periodic Benefit Costs for the period ended
Discount rate - service cost	2.81	%
Discount rate - interest cost	1.57	%
Expected return on assets	4.80	%

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Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2021

Variable Interest Entities [Abstract]

Variable Interest Entities Assets and Liabilities

Our Condensed Consolidated Balance Sheets (unaudited) included the following assets and liabilities associated with Rosewater:

(in millions)	March 31, 2021		December 31, 2020
Net Property, Plant and Equipment	$	174.2	$	175.6
Current assets	4.2		1.7
Total assets(1)	$	178.4	$	177.3
Current liabilities	$	2.8	$	15.3
Asset retirement obligations	5.5		5.5
Other noncurrent liabilities	0.1		0.1
Total liabilities	$	8.4	$	20.9

(1)The assets of Rosewater represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE.

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Short-Term Borrowings (Tables)

3 Months Ended

Mar. 31, 2021

Short-term Debt [Abstract]

Schedule Of Short-Term Borrowings

Short-term borrowings were as follows: 

(in millions)	March 31, 2021		December 31, 2020
Commercial paper weighted-average interest rate of 0.19% and 0.27% at March 31, 2021 and December 31, 2020, respectively	520.0		503.0
Total Short-Term Borrowings	$	520.0	$	503.0

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Other Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Restructuring Reserve by Type of Cost

A rollforward of the one-time employee separation benefits accrual for the three months ended March 31, 2021 is presented below:

(in millions)	Balance as of January 1, 2021	Changes Attributable to Costs Incurred(1)	Costs Paid	Adjustments	Balance as of March 31, 2021(2)
One-time Employee Separation Benefits	11.1	4.6	(8.4)	—	7.3

(1)This activity is presented within "Operation and maintenance" in our Condensed Statements of Consolidated Income (unaudited).

(2)This activity is presented within "Accrued compensation and employee benefits" in our Condensed Consolidated Balance Sheets (unaudited).

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2021

Other Comprehensive Income (Loss), Tax [Abstract]

Components Of Accumulated Other Comprehensive Loss

The following tables display the components of Accumulated Other Comprehensive Loss:

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2021	$	6.0	$	(147.9)	$	(14.8)	$	(156.7)
Other comprehensive income (loss) before reclassifications	(2.2)		84.6		(1.4)		81.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)		—		0.5		0.2
Net current-period other comprehensive income (loss)	(2.5)		84.6		(0.9)		81.2
Balance as of March 31, 2021	$	3.5	$	(63.3)	$	(15.7)	$	(75.5)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

(in millions)	Gains and Losses on Securities(1)		Gains and Losses on Cash Flow Hedges(1)		Pension and OPEB Items(1)		Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2020	$	3.3	$	(77.2)	$	(18.7)	$	(92.6)
Other comprehensive income (loss) before reclassifications	(5.2)		(133.3)		0.4		(138.1)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		—		0.3		0.1
Net current-period other comprehensive income (loss)	(5.4)		(133.3)		0.7		(138.0)
Balance as of March 31, 2020	$	(2.1)	$	(210.5)	$	(18.0)	$	(230.6)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.

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Other, Net (Tables)

3 Months Ended

Mar. 31, 2021

Other, Net [Abstract]

Schedule of Other Nonoperating Income (Expense)

Three Months Ended March 31, (in millions)	2021		2020
Interest income	$	0.9	$	1.7
AFUDC equity	1.5		1.7
Pension and other postretirement non-service benefit	8.5		2.7
Miscellaneous	(0.4)		(0.7)
Total Other, net	$	10.5	$	5.4

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Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule Of Operating Income Derived From Revenues And Expenses By Segment

At March 31, 2021, our operations are divided into two primary reportable segments, the Gas Distribution Operations and Electric Operations segments. Corporate costs and other activities that are not significant on a stand-alone basis to warrant treatment as an operating segment and that do not fit into one of our two segments are aggregated as "Corporate and Other" in the disclosures below. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues.

The following table provides information about our business segments. We use operating income as our primary measurement for each of the reported segments and make decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.

	Three Months Ended March 31,
(in millions)	2021		2020
Operating Revenues
Gas Distribution Operations
Unaffiliated	$	1,135.8	$	1,228.0
Intersegment	3.1		3.0
Total	1,138.9		1,231.0
Electric Operations
Unaffiliated	402.5		377.3
Intersegment	0.2		0.2
Total	402.7		377.5
Corporate and Other
Unaffiliated	7.3		0.2
Intersegment	103.9		106.7
Total	111.2		106.9
Eliminations	(107.2)		(109.9)
Consolidated Operating Revenues	$	1,545.6	$	1,605.5
Operating Income (Loss)
Gas Distribution Operations	$	346.9	$	78.5
Electric Operations	87.9		78.5
Corporate and Other	(1.6)		(8.8)
Consolidated Operating Income	$	433.2	$	148.2

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Revenue Recognition (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Service Area By County	20

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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Customer revenues	$ 1,506.5	$ 1,525.9
Other revenues	39.1	79.6
Total Operating Revenues	1,545.6	1,605.5
Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	1,127.1	1,171.3
Other revenues	8.7	56.7
Total Operating Revenues	1,135.8	1,228.0
Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	379.2	354.4
Other revenues	23.3	22.9
Total Operating Revenues	402.5	377.3
Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0.2	0.2
Other revenues	7.1	0.0
Total Operating Revenues	7.3	0.2
Residential
Disaggregation of Revenue [Line Items]
Customer revenues	902.7	915.7
Residential | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	773.5	796.5
Residential | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	129.2	119.2
Residential | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0.0	0.0
Commercial
Disaggregation of Revenue [Line Items]
Customer revenues	394.3	389.6
Commercial | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	271.4	269.4
Commercial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	122.9	120.2
Commercial | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0.0	0.0
Industrial
Disaggregation of Revenue [Line Items]
Customer revenues	180.8	183.3
Industrial | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	57.9	74.2
Industrial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	122.9	109.1
Industrial | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0.0	0.0
Off-system
Disaggregation of Revenue [Line Items]
Customer revenues	14.4	18.7
Off-system | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	14.4	18.7
Off-system | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	0.0	0.0
Off-system | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0.0	0.0
Miscellaneous
Disaggregation of Revenue [Line Items]
Customer revenues	14.3	18.6
Miscellaneous | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	9.9	12.5
Miscellaneous | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	4.2	5.9
Miscellaneous | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	$ 0.2	$ 0.2

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Revenue Recognition (Customer Accounts Receivable) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Customer Accounts Receivable, Billed (Less Reserve)	$ 507.4	$ 400.0
Customer Accounts Receivable, Unbilled (Less Reserve)	244.3	$ 327.2
Increase (Decrease) in Customer Accounts Receivable, Billed (Less Reserve)	107.4
Increase (Decrease) in Customer Accounts Receivable, Unbilled (Less Reserve)	$ (82.9)

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Revenue Recognition Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	$ 53.9	$ 52.3
Current period provisions	8.8
Write-offs charged against allowance	(11.4)
Recoveries of amounts previously written off	4.2
Gas Distribution Operations
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	42.8	41.8
Current period provisions	5.9
Write-offs charged against allowance	(9.0)
Recoveries of amounts previously written off	4.1
Electric Operations
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	10.3	9.7
Current period provisions	2.9
Write-offs charged against allowance	(2.4)
Recoveries of amounts previously written off	0.1
Corporate and Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	0.8	$ 0.8
Current period provisions	0.0
Write-offs charged against allowance	0.0
Recoveries of amounts previously written off	$ 0.0

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Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Denominator
Basic Average Common Shares Outstanding	392,657	383,062
Dilutive potential common shares
Shares contingently issuable under employee stock plans	630	845
Shares restricted under stock plans	288	207
Forward agreements	337	0
Diluted Average Common Shares	393,912	384,114

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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Preferred Stock, Shares Authorized	20,000,000		20,000,000
Preferred Stock, Shares Outstanding	440,000		440,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
At The Market Program
Common Stock Aggregate Sale Price	$ 750.0
ATM Program Equity Remaining Available for Issuance	$ 600.0
Forward February 21 Member
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share	$ 22.48
Forward Contract Indexed to Issuer's Equity, Shares	6,672,740
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	$ 148.5
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value	$ 22.25
Series A Preferred Stock
Preferred Stock, Shares Outstanding	400,000
Preferred Stock, Amount of Preferred Dividends in Arrears	$ 6.7	$ 6.7
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears	$ 16.63	$ 16.63
Series B Preferred Stock
Preferred Stock, Shares Outstanding	20,000
Preferred Stock, Amount of Preferred Dividends in Arrears	$ 1.4	$ 1.4
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears	$ 72.23	$ 72.23
Series B-1 Preferred Stock
Preferred Stock, Shares Outstanding	20,000

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Equity Schedule of Stock by Class - Preferred (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	440,000		440,000
Shares outstanding	$ 5,931.6		$ 5,752.2
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 1,000.00
Preferred Stock, Shares Outstanding	400,000
Dividends Declared Per Share	$ 28.25	$ 28.25
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 25,000.00
Preferred Stock, Shares Outstanding	20,000
Dividends Declared Per Share	$ 812.50	$ 812.50
Series B-1 Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	20,000
Preferred Stock | Series A Preferred Stock
Class of Stock [Line Items]
Shares outstanding	$ 393.9		393.9
Preferred Stock | Series B Preferred Stock
Class of Stock [Line Items]
Shares outstanding	$ 486.1		$ 486.1

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Gas in Storage (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Gas in Storage [Abstract]
LIFO Inventory Amount	$ 22.3	$ 0.0

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Property, Plant, and Equipment (Narrative) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Property, Plant and Equipment [Abstract]
Plant and Equipment associated with Schahfer Generating Station Retirement	$ 861.6

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Regulatory Matters (Schedule of COVID-19 Regulatory Impact) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Incremental O&M - COVID | Columbia Of Ohio
Regulated Operations
Regulatory Assets	$ 2.0
Incremental O&M - COVID | Columbia Of Virginia
Regulated Operations
Regulatory Assets	0.1
Incremental O&M and Bad Debt - COVID | NIPSCO
Regulated Operations
Regulatory Assets	12.0
Incremental O&M and Bad Debt - COVID | Columbia Of Maryland
Regulated Operations
Regulatory Assets	1.1
Incremental Bad Debt - COVID | Columbia Of Pennsylvania
Regulated Operations
Regulatory Assets	$ 7.1

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Risk Management Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Limit of GCA Volumes	20.00%
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0.0	$ 0.0
Minimum
Derivative [Line Items]
Commodity Contract Length	5 years
Maximum
Derivative [Line Items]
Commodity Contract Length	10 years
Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	$ 500.0

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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Risk management assets	$ 1.0	$ 10.4
Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Risk management assets	3.2	2.8
Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Risk management liabilities	22.1	78.2
Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Risk management liabilities	78.9	144.6
Interest Rate Risk | Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Risk management assets	0.0	0.0
Interest Rate Risk | Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Risk management assets	0.0	0.0
Interest Rate Risk | Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Risk management liabilities	17.1	70.9
Interest Rate Risk | Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Risk management liabilities	40.6	99.5
Commodity Price Risk Programs | Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Risk management assets	1.0	10.4
Commodity Price Risk Programs | Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Risk management assets	3.2	2.8
Commodity Price Risk Programs | Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Risk management liabilities	5.0	7.3
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Risk management liabilities	$ 38.3	$ 45.1

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Fair Value (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosure [Line Items]
Transfers between Fair Value Hierarchies	$ 0.0	$ 0.0
Material Level 3 Changes	0.0	0.0
Allowance for Credit Loss	(0.3)	(0.5)
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Available-for-sale Securities, Maturities, Next Twelve Months, Fair Value	6.2
Allowance for Credit Loss	0.0	0.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Available-for-sale Securities, Maturities, Next Twelve Months, Fair Value	3.9
Allowance for Credit Loss	$ (0.3)	$ (0.5)

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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Total	$ 172.1	$ 184.1
Liabilities
Total	101.0	222.8
Fair Value, Inputs, Level 1
Assets
Risk management assets	0.0	0.0
Available-for-sale securities	0.0	0.0
Total	0.0	0.0
Liabilities
Risk management liabilities	0.0	0.0
Total	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets
Risk management assets	4.2	13.2
Available-for-sale securities	167.9	170.9
Total	172.1	184.1
Liabilities
Risk management liabilities	101.0	222.8
Total	101.0	222.8
Significant Unobservable Inputs (Level 3)
Assets
Risk management assets	0.0	0.0
Available-for-sale securities	0.0	0.0
Total	0.0	0.0
Liabilities
Risk management liabilities	0.0	0.0
Total	0.0	0.0
Available-for-sale Securities
Assets
Available-for-sale securities	167.9	170.9
Risk management assets
Assets
Risk management assets	4.2	13.2
Liabilities
Risk management liabilities	$ 101.0	$ 222.8

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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosure [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 22.1	$ 0.0
Amortized Cost	163.8	163.9
Gross Unrealized Gains	5.5	8.0
Gross Unrealized Losses	(1.1)	(0.5)
Allowance for Credit Loss	(0.3)	(0.5)
Fair Value	167.9	170.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25.7	13.2
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	37.1	33.7
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.3)	0.0
Allowance for Credit Loss	0.0	0.0
Fair Value	37.0	34.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	126.7	130.2
Gross Unrealized Gains	5.3	7.7
Gross Unrealized Losses	(0.8)	(0.5)
Allowance for Credit Loss	(0.3)	(0.5)
Fair Value	$ 130.9	$ 136.9

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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Long-term Debt (including current portion), Carrying Amount	$ 9,246.7	$ 9,243.1
Long-term debt (including current portion), Estimated Fair Value	$ 10,178.0	$ 11,034.2

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Transfers Of Financial Assets (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Number of Agreements	3
Cash From Financing Activities Related To The Change In Short-Term Borrowings Due To The Securitization Transactions	$ 0.0	$ 106.2
Securitization Transaction Fees	0.4	$ 0.7
Accounts Receivable Program
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Seasonal Limit	$ 510.0

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Transfers Of Financial Assets (Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Gross Receivables	$ 630.8	$ 607.7
Less: Receivables not transferred	630.8	607.7
Net receivables transferred	0.0	0.0
Short-term debt due to asset securitization	$ 0.0	$ 0.0

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Goodwill (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,485.9	$ 1,485.9

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Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,485.9	$ 1,485.9
Gas Distribution Operations
Goodwill [Line Items]
Goodwill	1,485.9
Electric Operations
Goodwill [Line Items]
Goodwill	0.0
Corporate and Other
Goodwill [Line Items]
Goodwill	$ 0.0

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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rates	17.40%	(24.50%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%
Increase (Decrease) in Effective Tax Rate	41.90%
Changes to Liability for Uncertain Tax Positions	$ 0.0

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Pension And Other Postretirement Benefits (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0.7
Defined Benefit Plan, Pension Asset, (Increase)Decrease For Remeasurement Due To Settlement	(5.8)
Change in Regulatory Assets Due to Interim Measurement	2.1
Change in Accumulated Other Comprehensive Income Due to Interim Measurement	0.4
Change to Defined Benefit Plan Net Periodic Costs Due to Interim Measurement	4.0
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5.1

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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 7.6	$ 8.0
Interest cost	7.7	13.5
Expected return on assets	(25.8)	(28.4)
Amortization of prior service credit	0.0	0.2
Recognized actuarial loss	5.3	8.7
Settlement loss	(3.3)	0.0
Total Net Periodic Benefits Cost	(1.9)	2.0
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1.5	1.6
Interest cost	2.5	3.9
Expected return on assets	(3.8)	(3.6)
Amortization of prior service credit	(0.6)	(0.5)
Recognized actuarial loss	1.2	1.3
Settlement loss	0.0	0.0
Total Net Periodic Benefits Cost	$ 0.8	$ 2.7

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Pension And Other Postretirement Benefits Schedule of Assumptions Used (Details) - Pension Plan	3 Months Ended
	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.57%
Discount rate- service cost	2.81%
Discount rate - interest cost	1.57%
Expected return on assets	4.80%

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Variable Interest Entities (Narrative) (Details)	3 Months Ended		4 Months Ended
	Mar. 31, 2021 USD ($) Rate MW	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Rate MW	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Nameplate Capacity | MW	102		102
Wind Power Purchase Agreement, Purchase Percentage | Rate	100.00%		100.00%
Total Equity Membership Interest	100.00%		100.00%
Additional Obligation to the Developer	$ 6,000,000.0		$ 6,000,000.0
Payment to renewable generation asset developer	(7,400,000)	$ 0
Total Obligation to the Developer	75,700,000		75,700,000
Total Contributions	170,100,000		170,100,000
VIE Net Assets	170,000,000.0		170,000,000.0	$ 156,400,000
Noncontrolling interest in consolidated subsidiaries	94,100,000		$ 94,100,000	$ 85,600,000
Net income attributable to noncontrolling interest	$ 1,000,000.0	$ 0
Rosewater Wind Farm
Variable Interest Entity [Line Items]
Wind Power Purchase Agreement, Purchase Percentage | Rate	100.00%		100.00%
NIPSCO
Variable Interest Entity [Line Items]
Cash Contribution	$ 100,000		$ 800,000
Tax Equity Partner
Variable Interest Entity [Line Items]
Cash Contribution	$ 7,500,000		$ 93,600,000

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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Current assets	[1]	$ 1,593.5	$ 1,659.4
Total Assets		22,194.5	22,040.5
Current liabilities		2,258.8	2,279.4
Asset retirement obligations		479.7	477.1
Other noncurrent liabilities		444.5	515.5
Rosewater
Variable Interest Entity [Line Items]
Net Property, Plant and Equipment		174.2	175.6
Current assets		4.2	1.7
Total Assets		178.4	177.3
Current liabilities		2.8	15.3
Asset retirement obligations		5.5	5.5
Other noncurrent liabilities		0.1	0.1
Total liabilities		$ 8.4	$ 20.9

[1] (1)Includes $174.2 million and $175.6 million of net property, plant and equipment assets and $4.2 million and $1.7 million of current assets of a consolidated VIE as of March 31, 2021 and December 31, 2020 that may be used only to settle obligations of the consolidated VIE. Refer to Note 15 "Variable Interest Entities" for additional information.

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Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Commercial paper outstanding	$ 520.0	$ 503.0
Revolving Credit Facility
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,850.0
Long-term Line of Credit	0.0	$ 0.0
Commercial Paper
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500.0

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Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Commercial paper weighted-average interest rate of 0.19% and 0.27% at March 31, 2021 and December 31, 2020, respectively	$ 520.0	$ 503.0
Total short-term borrowings	$ 520.0	$ 503.0
Commercial Paper
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.19%	0.27%

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Other Commitments And Contingencies (Narrative) (Details)	3 Months Ended	4 Months Ended	31 Months Ended
	Mar. 31, 2021 USD ($) Rate	Dec. 31, 2018 USD ($)	Mar. 31, 2021 USD ($) Rate	Dec. 31, 2020 USD ($)	Jul. 26, 2019 USD ($)
Other Commitments And Contingencies [Line Items]
Guaranty Liabilities	$ 34,000,000.0		$ 34,000,000.0
Litigation Settlement, Amount Awarded to Other Party					$ 143,000,000
Recorded reserves to cover environmental remediation at various sites	$ 90,600,000		$ 90,600,000	$ 92,600,000
Wind Power Purchase Agreement, Purchase Percentage | Rate	100.00%		100.00%
Costs Resulting from the Greater Lawrence Incident		$ 1,023,000,000
Restructuring and Related Cost, Expected Cost	$ 40,000,000		$ 40,000,000
Restructuring and Related Cost, Cost Incurred to Date	$ 38,100,000		$ 38,100,000
MGP Sites
Other Commitments And Contingencies [Line Items]
Number of waste disposal sites identified by program	54		54
Liability for Estimated Remediation Costs	$ 84,300,000		$ 84,300,000	85,000,000.0
Reasonably possible remediation costs variance from reserve	$ 20,000,000		20,000,000
Columbia Of Massachusetts
Other Commitments And Contingencies [Line Items]
Gas Meters Affected	7,500
Businesses Impacted by Incident	700
Plea Agreement Criminal Fine	$ 53,030,116
Pipeline Replacement Expenses			258,000,000
Deferred Tax Assets, Net	50,000,000		50,000,000
Minimum | Columbia Of Massachusetts
Other Commitments And Contingencies [Line Items]
Expenses Related to Third-Party Claims			1,040,000,000
Standby Letters of Credit
Other Commitments And Contingencies [Line Items]
Long-term Line of Credit	$ 15,200,000		$ 15,200,000	$ 15,200,000

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Other Commitments And Contingencies (Restructuring) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 7.3	$ 11.1
Restructuring Reserve, Period Increase (Decrease)	4.6
Payments for Restructuring	(8.4)
Restructuring Reserve, Accrual Adjustment	$ 0.0

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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (156.7)	$ (92.6)
Other Comprehensive Income (Loss) before reclassifications	81.0	(138.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.1
Net current-period other comprehensive income (loss)	81.2	(138.0)
Ending Balance	(75.5)	(230.6)
Gains and Losses on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	6.0	3.3
Other Comprehensive Income (Loss) before reclassifications	(2.2)	(5.2)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)	(0.2)
Net current-period other comprehensive income (loss)	(2.5)	(5.4)
Ending Balance	3.5	(2.1)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(147.9)	(77.2)
Other Comprehensive Income (Loss) before reclassifications	84.6	(133.3)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Net current-period other comprehensive income (loss)	84.6	(133.3)
Ending Balance	(63.3)	(210.5)
Pension and OPEB Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(14.8)	(18.7)
Other Comprehensive Income (Loss) before reclassifications	(1.4)	0.4
Amounts reclassified from accumulated other comprehensive income (loss)	0.5	0.3
Net current-period other comprehensive income (loss)	(0.9)	0.7
Ending Balance	$ (15.7)	$ (18.0)

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Other, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other, Net [Abstract]
Interest income	$ 0.9	$ 1.7
AFUDC equity	1.5	1.7
Pension and other postretirement non-service benefit	8.5	2.7
Miscellaneous	(0.4)	(0.7)
Other, net	$ 10.5	$ 5.4

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Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Primary business segments	2

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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 1,545.6	$ 1,605.5
Consolidated Operating Income (Loss)	433.2	148.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	(107.2)	(109.9)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	1,138.9	1,231.0
Consolidated Operating Income (Loss)	346.9	78.5
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	1,135.8	1,228.0
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.1	3.0
Electric Operations
Segment Reporting Information [Line Items]
Revenues	402.7	377.5
Consolidated Operating Income (Loss)	87.9	78.5
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	402.5	377.3
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.2
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	111.2	106.9
Consolidated Operating Income (Loss)	(1.6)	(8.8)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	7.3	0.2
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 103.9	$ 106.7

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Subsequent Event (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Apr. 19, 2021	Mar. 31, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Preferred Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01
Subsequent Event | Series C Preferred Stock
Subsequent Event [Line Items]
Undivided Beneficial Ownership Interest, Percent	10.00%
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Subsequent Event | Series A Corporate Units
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues	8,625
Shares Issued, Price Per Share	$ 100
Net Proceeds from Sale	$ 835.5
Corporate Units Contract Annual Rate	7.75%