Item 1. FINANCIAL STATEMENTS

NiSource Inc.

Condensed Statements of Consolidated Income (unaudited)

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions, except per share amounts)			2025						2024						2025						2024
Operating Revenues
Customer revenues			$	1,246.5					$	1,054.1					$	3,396.0					$	2,697.1
Other revenues			36.5						30.6						70.2						93.9
Total Operating Revenues			1,283.0						1,084.7						3,466.2						2,791.0
Operating Expenses
Cost of energy			261.8						164.7						909.3						589.7
Operation and maintenance			396.2						357.7						824.0						736.1
Depreciation and amortization			286.7						253.5						545.3						495.6
Loss on impairment of assets			0.4						2.9						0.7						2.9
Loss on sale of assets, net			0.8						1.6						0.8						1.6
Other taxes			74.2						67.3						163.8						144.7
Total Operating Expenses			1,020.1						847.7						2,443.9						1,970.6
Operating Income			262.9						237.0						1,022.3						820.4
Other Income (Deductions)
Interest expense, net			(139.1)						(129.3)						(271.9)						(245.6)
Other, net			0.5						13.0						6.3						22.2
Total Other Deductions, Net			(138.6)						(116.3)						(265.6)						(223.4)
Income before Income Taxes			124.3						120.7						756.7						597.0
Income Taxes			23.8						17.6						129.5						93.6
Net Income			100.5						103.1						627.2						503.4
Net income (loss) attributable to noncontrolling interest			(1.7)						17.3						50.2						52.6
Net Income Attributable to NiSource			102.2						85.8						577.0						450.8
Preferred dividends			—						—						—						(6.7)
Preferred redemption premium			—						—						—						(14.0)
Net Income Available to Common Shareholders			$	102.2					$	85.8					$	577.0					$	430.1
Earnings Per Share
Basic Earnings Per Share			$	0.22					$	0.19					$	1.22					$	0.96
Diluted Earnings Per Share			$	0.22					$	0.19					$	1.22					$	0.95
Basic Average Common Shares Outstanding			471.0						448.5						470.6						448.2
Diluted Average Common Shares			472.1						450.2						472.3						449.8

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

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Comprehensive Income (unaudited)

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions, net of taxes)			2025						2024						2025						2024
Net Income			$	100.5					$	103.1					$	627.2					$	503.4
Other comprehensive income:
Net unrealized gain (loss) on available-for-sale debt securities(1)			1.0						—						1.8						(0.3)
Reclassification adjustment for cash flow hedges(2)			(0.1)						(0.1)						(0.2)						(0.2)
Unrecognized pension and OPEB benefit(3)			0.1						0.3						0.6						0.5
Total other comprehensive income			1.0						0.2						2.2						—
Comprehensive Income			$	101.5					$	103.3					$	629.4					$	503.4

(1)Net unrealized gain (loss) on available-for-sale debt securities, net of $0.3 million tax expense and $0.0 million tax expense in the second quarter of 2025 and 2024, respectively, and $0.5 million tax expense and $0.1 million of tax benefit for the six months ended 2025 and 2024, respectively.

(2)Reclassification adjustment for cash flow hedges, net of $0.1 million tax benefit and $0.0 million tax benefit in the second quarter of 2025 and 2024, respectively, and $0.1 million of tax benefit and $0.0 million tax benefit for the six months ended 2025 and 2024, respectively.

(3)Unrecognized pension and OPEB benefit, net of $0.1 million of tax expense and $0.1 million tax expense in the second quarter of 2025 and 2024, respectively, and $0.2 million of tax expense and $0.2 million tax expense for the six months ended 2025 and 2024, respectively.

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

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Consolidated Balance Sheets (unaudited)

(in millions)			June 30, 2025						December 31, 2024
ASSETS
Property, Plant and Equipment
Plant			$	36,448.3					$	34,152.9
Accumulated depreciation and amortization			(8,996.8)						(8,699.0)
Net Property, Plant and Equipment(1)			27,451.5						25,453.9
Investments and Other Assets
Unconsolidated affiliates			7.8						6.5
Available-for-sale debt securities (amortized cost of $147.9 and $91.9, allowance for credit losses of $0.1 and $0.1, respectively)			144.9						86.7
Other investments			107.0						85.5
Total Investments and Other Assets			259.7						178.7
Current Assets
Cash and cash equivalents			335.4						156.6
Restricted cash			30.2						42.0
Accounts receivable			805.9						987.9
Allowance for credit losses			(27.3)						(23.7)
Accounts receivable, net			778.6						964.2
Gas storage			148.2						179.6
Materials and supplies, at average cost			187.7						173.3
Electric production fuel, at average cost			32.1						36.2
Exchange gas receivable			33.0						45.7
Regulatory assets			287.1						319.9
Prepayments			143.5						138.5
Other current assets			23.0						24.2
Total Current Assets(1)			1,998.8						2,080.2
Other Assets
Regulatory assets			2,178.4						2,157.4
Goodwill			1,485.9						1,485.9
Deferred charges and other			654.6						432.0
Total Other Assets			4,318.9						4,075.3
Total Assets			$	34,028.9					$	31,788.1

(1)Includes $1,295.7 million and $1,323.8 million at June 30, 2025 and December 31, 2024, respectively, of net property, plant and equipment assets and $60.9 million and $65.0 million at June 30, 2025 and December 31, 2024, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 4, "Noncontrolling Interests," for additional information.

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

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Consolidated Balance Sheets (unaudited) (continued)

(in millions, except share amounts)			June 30, 2025						December 31, 2024
CAPITALIZATION AND LIABILITIES
Capitalization
Stockholders’ Equity
Common stock - $0.01 par value,750,000,000 shares authorized; 470,784,423 and 469,822,472 shares outstanding, respectively			$	4.7					$	4.7
Treasury stock			(99.9)						(99.9)
Additional paid-in capital			9,538.0						9,521.5
Retained deficit			(532.1)						(711.7)
Accumulated other comprehensive loss			(28.2)						(30.4)
Total NiSource Stockholders’ Equity			8,882.5						8,684.2
Noncontrolling interest in consolidated subsidiaries			2,114.4						1,984.1
Total Stockholders’ Equity			10,996.9						10,668.3
Long-term debt, excluding amounts due within one year			14,473.8						12,074.5
Total Capitalization			25,470.7						22,742.8
Current Liabilities
Current portion of long-term debt			1,282.2						1,281.2
Short-term borrowings			—						604.6
Accounts payable			683.9						863.1
Dividends payable - common stock			135.1						—
Customer deposits and credits			159.9						268.8
Taxes accrued			172.4						173.4
Interest accrued			177.8						157.0
Asset retirement obligations			58.2						84.6
Exchange gas payable			80.7						91.8
Regulatory liabilities			194.9						150.5
Accrued compensation and employee benefits			161.3						268.2
Other accruals			305.9						170.2
Total Current Liabilities(1)			3,412.3						4,113.4
Other Liabilities
Deferred income taxes			2,387.2						2,281.6
Accrued liability for postretirement and postemployment benefits			200.5						207.5
Regulatory liabilities			1,459.0						1,431.2
Asset retirement obligations			754.8						698.6
Other noncurrent liabilities and deferred credits			344.4						313.0
Total Other Liabilities(1)			5,145.9						4,931.9
Commitments and Contingencies (Refer to Note 15, "Other Commitments and Contingencies")
Total Capitalization and Liabilities			$	34,028.9					$	31,788.1

(1)Includes $53.9 million and $53.7 million at June 30, 2025 and December 31, 2024, respectively, of current liabilities and $54.4 million and $58.3 million at June 30, 2025 and December 31, 2024, respectively, of other liabilities, and finance leases of $40.2 million and $40.4 million at June 30, 2025 and December 31, 2024 respectively, of consolidated VIEs that creditors do not have recourse to our general credit. Refer to Note 4, "Noncontrolling Interests," for additional information.

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

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Cash Flows (unaudited)

Six Months Ended June 30, (in millions)			2025						2024
Operating Activities
Net Income			$	627.2					$	503.4
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:
Depreciation and amortization			545.3						495.6
Deferred income taxes and investment tax credits			120.4						85.1
Loss on sale of assets			0.8						1.6
Payments for asset retirement obligations			(31.3)						(35.0)
Other adjustments			22.3						2.5
Changes in Assets and Liabilities:
Components of working capital(1)			(64.8)						(116.2)
Regulatory assets/liabilities			(23.7)						(5.9)
Deferred charges and other noncurrent assets			(14.9)						(32.7)
Other noncurrent liabilities and deferred credits			0.5						3.3
Net Cash Flows from Operating Activities			1,181.8						901.7
Investing Activities
Capital expenditures			(1,295.5)						(1,219.3)
Milestone payments to renewable generation asset developers			(958.0)						(320.8)
Advanced deposits			(160.9)						—
Other investing activities			(151.9)						(53.9)
Net Cash Flows used for Investing Activities			(2,566.3)						(1,594.0)
Financing Activities
Proceeds from issuance of long-term debt			2,362.0						1,734.5
Repayments of finance lease obligations			(10.9)						(13.5)
Repayment of short-term debt (maturity > 90 days)			—						(1,650.0)
Net change in commercial paper and other short-term borrowings			(604.6)						(754.6)
Issuance of common stock, net of issuance costs			6.8						5.6
Redemption of preferred stock			—						(486.1)
Preferred stock redemption premium			—						(14.0)
Equity costs, premiums and other debt related costs			(17.7)						(60.0)
Contributions from NIPSCO minority interest holders			134.3						59.7
Distributions to tax equity partners			(9.8)						(8.2)
Distribution to NIPSCO minority interest holders			(44.4)						(20.2)
Dividends paid - common stock			(264.2)						(237.9)
Dividends paid - preferred stock			—						(8.2)
Net Cash Flows from (used for) Financing Activities			1,551.5						(1,452.9)
Change in cash, cash equivalents and restricted cash			167.0						(2,145.2)
Cash, cash equivalents and restricted cash at beginning of period			198.6						2,281.1
Cash, Cash Equivalents and Restricted Cash at End of Period			$	365.6					$	135.9
(1) Refer to Note 19, "Supplemental Disclosures of Cash Flow Information," for additional information.

Reconciliation to Balance Sheet

Six Months Ended June 30, (in millions)			2025
Cash and cash equivalents			335.4
Restricted cash			30.2
Total Cash, Cash Equivalents and Restricted Cash			365.6

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

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Equity (unaudited)

(in millions)			Common Stock						Preferred Stock						Treasury Stock						Additional Paid-In Capital						Retained Deficit						Accumulated Other Comprehensive Loss						Noncontrolling Interest in Consolidated Subsidiaries						Total
Balance as of April 1, 2025			$	4.7					$	—					$	(99.9)					$	9,522.6					$	(501.4)					$	(29.2)					$	2,049.2					$	10,946.0
Comprehensive Income:
Net income (loss)			—						—						—						—						102.2						—						(1.7)						100.5
Other comprehensive gain, net of tax			—						—						—						—						—						1.0						—						1.0
Dividends:
Common stock ($0.280 per share)			—						—						—						—						(132.9)						—						—						(132.9)
Noncontrolling Interests:
Contributions from noncontrolling interests			—						—						—						—						—						—						99.5						99.5
Distributions to noncontrolling interests			—						—						—						—						—						—						(32.6)						(32.6)
Stock issuances:
Employee stock purchase plan			—						—						—						1.9						—						—						—						1.9
Long-term incentive plan			—						—						—						11.4						—						—						—						11.4
401(k) and profit sharing			—						—						—						2.1						—						—						—						2.1
Balance as of June 30, 2025			$	4.7					$	—					$	(99.9)					$	9,538.0					$	(532.1)					$	(28.2)					$	2,114.4					$	10,996.9
(in millions)			Common Stock						Preferred Stock						Treasury Stock						Additional Paid-In Capital						Retained Deficit						Accumulated Other Comprehensive Loss						Noncontrolling Interest in Consolidated Subsidiaries						Total
Balance as of January 1, 2025			$	4.7					$	—					$	(99.9)					$	9,521.5					$	(711.7)					$	(30.4)					$	1,984.1					$	10,668.3
Comprehensive Income:
Net income			—						—						—						—						577.0						—						50.2						627.2
Other comprehensive gain, net of tax			—						—						—						—						—						2.2						—						2.2
Dividends:
Common stock ($0.840 per share)			—						—						—						—						(397.4)						—						—						(397.4)
Noncontrolling Interests:
Contributions from noncontrolling interests			—						—						—						—						—						—						134.3						134.3
Distributions to noncontrolling interests			—						—						—						—						—						—						(54.2)						(54.2)
Stock issuances:
Employee stock purchase plan			—						—						—						3.6						—						—						—						3.6
Long-term incentive plan			—						—						—						8.1						—						—						—						8.1
401(k) and profit sharing			—						—						—						4.8						—						—						—						4.8
Balance as of June 30, 2025			$	4.7					$	—					$	(99.9)					$	9,538.0					$	(532.1)					$	(28.2)					$	2,114.4					$	10,996.9

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

(in millions)			Common Stock						Preferred Stock						Treasury Stock						Additional Paid-In Capital						Retained Deficit						Accumulated Other Comprehensive Loss						Noncontrolling Interest in Consolidated Subsidiaries						Total
Balance as of April 1, 2024			$	4.5					$	—					$	(99.9)					$	8,886.8					$	(861.7)					$	(33.8)					$	1,899.0					$	9,794.9
Comprehensive Income:
Net income			—						—						—						—						85.8						—						17.3						103.1
Other comprehensive gain, net of tax			—						—						—						—						—						0.2						—						0.2
Dividends:
Common stock ($0.265 per share)			—						—						—						—						(120.3)						—						—						(120.3)
Noncontrolling Interests:
Contributions from noncontrolling interests			—						—						—						—						—						—						59.7						59.7
Distributions to noncontrolling interest			—						—						—						—						—						—						(25.4)						(25.4)
Stock issuances:
Employee stock purchase plan			—						—						—						1.6						—						—						—						1.6
Long-term incentive plan			—						—						—						3.6						—						—						—						3.6
401(k) and profit sharing			—						—						—						2.2						—						—						—						2.2
Balance as of June 30, 2024			$	4.5					$	—					$	(99.9)					$	8,894.2					$	(896.2)					$	(33.6)					$	1,950.6					$	9,819.6
(in millions)			Common Stock						Preferred Stock						Treasury Stock						Additional Paid-In Capital						Retained Deficit						Accumulated Other Comprehensive Loss						Noncontrolling Interest in Consolidated Subsidiaries						Total
Balance as of January 1, 2024			$	4.5					$	486.1					$	(99.9)					$	8,879.5					$	(967.0)					$	(33.6)					$	1,866.7					$	10,136.3
Comprehensive Income:
Net income			—						—						—						—						450.8						—						52.6						503.4
Dividends:
Common stock ($0.795 per share)			—						—						—						—						(357.9)						—						—						(357.9)
Preferred stock (See Note 6)			—						—						—						—						(8.1)						—						—						(8.1)
Noncontrolling Interests:
Contributions from noncontrolling interests			—						—						—						—						—						—						59.7						59.7
Distributions to noncontrolling interest			—						—						—						—						—						—						(28.4)						(28.4)
Stock issuances (redemptions):
Series B and B-1 Preferred stock redemption			—						(486.1)						—						—						—						—						—						(486.1)
Series B and B-1 Preferred stock redemption premium			—						—						—						—						(14.0)						—						—						(14.0)
Employee stock purchase plan			—						—						—						3.0						—						—						—						3.0
Long-term incentive plan			—						—						—						6.9						—						—						—						6.9
401(k) and profit sharing			—						—						—						4.8						—						—						—						4.8
Balance as of June 30, 2024			$	4.5					$	—					$	(99.9)					$	8,894.2					$	(896.2)					$	(33.6)					$	1,950.6					$	9,819.6

Table of Contents

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 April 1, 2025			—						474,581						(3,963)						470,618
Issued:
Employee stock purchase plan			—						48						—						48
Long-term incentive plan			—						62						—						62
401(k) and profit sharing			—						56						—						56
Balance as of June 30, 2025			—						474,747						(3,963)						470,784
			Preferred						Common
Shares (in thousands)			Shares						Shares						Treasury						Outstanding
Balance as of January 1, 2025			—						473,785						(3,963)						469,822
Issued:
Employee stock purchase plan			—						94						—						94
Long-term incentive plan			—						744						—						744
401(k) and profit sharing			—						124						—						124
Balance as of June 30, 2025			—						474,747						(3,963)						470,784
			Preferred						Common
Shares (in thousands)			Shares						Shares						Treasury						Outstanding
Balance as of April 1, 2024			—						452,161						(3,963)						448,198
Issued:
Employee stock purchase plan			—						58						—						58
Long-term incentive plan			—						66						—						66
401(k) and profit sharing			—						77						—						77
Balance as of June 30, 2024			—						452,362						(3,963)						448,399
			Preferred						Common
Shares (in thousands)			Shares						Shares						Treasury						Outstanding
Balance as of January 1, 2024			40						451,345						(3,963)						447,382
Issued:
Employee stock purchase plan			—						111						—						111
Long-term incentive plan			—						729						—						729
401(k) and profit sharing			—						177						—						177
Redeemed:
Series B and B-1 Preferred Stock			(40)						—						—						—
Balance as of June 30, 2024			—						452,362						(3,963)						448,399

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

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

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, 2024. 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.

2. Recent Accounting Pronouncements

Recently Issued Accounting Pronouncements

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40). This pronouncement requires disaggregated disclosure of income statement expenses for public business entities. The ASU requires disclosure in tabular format of disaggregation of relevant expense captions presented on the income statement by certain natural expense categories with certain related qualitative disclosures within the notes to the financial statements. The ASU does not change the expense captions an entity presents on the income statement. The ASU is effective for fiscal years beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027, as defined in ASU 2025-01, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40). We are currently evaluating the impacts this amendment will have on our required disclosures.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This pronouncement enhances required income tax disclosures. The pronouncement will require disclosure of specific categories and reconciling items included in the rate reconciliation, disaggregation between federal, state and local income taxes paid, and disclosure of income taxes paid by jurisdictions over a certain threshold. Additionally, the pronouncement eliminates certain required disclosures related to unrecognized tax benefits. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted, and is to be applied on a prospective basis with retrospective application permitted. We will implement and provide the required disclosures in our Annual Report on Form 10-K for the year ended December 31, 2025.

Recently Adopted Accounting Pronouncements

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This pronouncement enhances annual and interim disclosure requirements over reportable segments, primarily through enhanced disclosures about significant segment expenses. Specifically, the pronouncement requires disclosure of significant segment expenses that are regularly provided to the CODM and included within each reported measure of segment profit or loss, disclosure of an amount for other segment items representing the difference between segment revenue and segment expenses already disclosed, disclosure of all required annual disclosures for interim periods and disclosure of title and position of the CODM and how the CODM uses reported measures. The pronouncement also allows for more than one measure of segment profit if the CODM uses more than one measure in assessing segment performance. This pronouncement was effective for annual periods beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. NiSource adopted this pronouncement as of December 31, 2024 with retrospective application and updated its disclosures to include significant expenses regularly provided to the CODM, the CODM's title and how the CODM utilizes reported measures. See Note 17, "Business Segment Information," for further discussion.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

3. Revenue Recognition

Revenue Disaggregation and Reconciliation. We disaggregate revenue from contracts with customers based upon reportable segment, as well as by customer class. The Columbia Operations segment provides regulated natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, and Maryland. The NIPSCO Operations segment provides regulated gas and electric service 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):

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Three months ended June 30, 2025 (in millions)			Columbia Operations						NIPSCO Operations						Corporate and Other						Total
Gas Distribution
Residential			$	397.0					$	114.2					$	—					$	511.2
Commercial			126.2						45.5						—						171.7
Industrial			37.6						22.6						—						60.2
Off-system			22.8						—						—						22.8
Miscellaneous(1)			8.7						3.3						—						12.0
Subtotal			$	592.3					$	185.6					$	—					$	777.9
Electric Generation and Power Delivery
Residential			$	—					$	163.9					$	—					$	163.9
Commercial			—						161.0						—						161.0
Industrial			—						133.5						—						133.5
Wholesale			—						11.9						—						11.9
Miscellaneous(1)			—						(1.7)						—						(1.7)
Subtotal			$	—					$	468.6					$	—					$	468.6
Total Customer Revenues**(2)**			592.3						654.2						—						1,246.5
Other Revenues**(3)**			8.9						26.4						1.2						36.5
Total Operating Revenues			$	601.2					$	680.6					$	1.2					$	1,283.0
(1)Amounts included in Columbia Operations primarily relate to earnings share mechanisms and late fees. Amounts included in NIPSCO Operations primarily relate to late fees and property rentals. (2)Customer revenue amounts exclude intersegment revenues. See Note 17, "Business Segment Information," for discussion of intersegment revenues. (3)Amounts included in Columbia Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms. Amounts included in NIPSCO Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms, MISO multi-value projects and revenue from non-jurisdictional transmission assets. Amounts included in Corporate and Other primarily relate to products and services revenue.
Three months ended June 30, 2024 (in millions)			Columbia Operations						NIPSCO Operations						Corporate and Other						Total
Gas Distribution
Residential			$	332.3					$	78.6					$	—					$	410.9
Commercial			96.9						30.7						—						127.6
Industrial			33.0						16.1						—						49.1
Off-system			10.6						—						—						10.6
Wholesale			0.2						—						—						0.2
Miscellaneous(1)			4.3						2.6						—						6.9
Subtotal			$	477.3					$	128.0					$	—					$	605.3
Electric Generation and Power Delivery
Residential			$	—					$	156.9					$	—					$	156.9
Commercial			—						154.4						—						154.4
Industrial			—						119.7						—						119.7
Wholesale			—						11.2						—						11.2
Public Authority			—						1.9						—						1.9
Miscellaneous(1)			—						4.7						—						4.7
Subtotal			$	—					$	448.8					$	—					$	448.8
Total Customer Revenues**(2)**			477.3						576.8						—						1,054.1
Other Revenues**(3)**			10.1						20.4						0.1						30.6
Total Operating Revenues			$	487.4					$	597.2					$	0.1					$	1,084.7
(1)Amounts included in Columbia Operations primarily relate to earnings share mechanisms and late fees. Amounts included in NIPSCO Operations, primarily relate to revenue refunds, public repairs and property rentals. (2)Customer revenue amounts exclude intersegment revenues. See Note 17, "Business Segment Information," for discussion of intersegment revenues. (3)Amounts included in Columbia Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms. Amounts included in NIPSCO Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms, MISO multi-value projects and revenue from non-jurisdictional transmission assets.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Six months ended June 30, 2025 (in millions)			Columbia Operations						NIPSCO Operations						Corporate and Other						Total
Gas Distribution
Residential			$	1,248.2					$	405.6					$	—					$	1,653.8
Commercial			432.7						148.6						—						581.3
Industrial			85.5						54.0						—						139.5
Off-system			45.1						—						—						45.1
Miscellaneous(1)			20.7						8.0						—						28.7
Subtotal			$	1,832.2					$	616.2					$	—					$	2,448.4
Electric Generation and Power Delivery
Residential			$	—					$	331.8					$	—					$	331.8
Commercial			—						321.1						—						321.1
Industrial			—						276.1						—						276.1
Wholesale			—						19.5						—						19.5
Miscellaneous(1)			—						(0.9)						—						(0.9)
Subtotal			$	—					$	947.6					$	—					$	947.6
Total Customer Revenues**(2)**			1,832.2						1,563.8						—						3,396.0
Other Revenues**(3)**			9.6						58.2						2.4						70.2
Total Operating Revenues			$	1,841.8					$	1,622.0					$	2.4					$	3,466.2
(1)Amounts included in Columbia Operations primarily relate to earnings share mechanisms and late fees. Amounts included in NIPSCO Operations primarily relate to late fees and property rentals. (2)Customer revenue amounts exclude intersegment revenues. See Note 17, "Business Segment Information," for discussion of intersegment revenues. (3)Amounts included in Columbia Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms. Amounts included in NIPSCO Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms, MISO multi-value projects and revenue from non-jurisdictional transmission assets. Amounts included in Corporate and Other primarily relate to products and services revenue.
Six months ended June 30, 2024 (in millions)			Columbia Operations						NIPSCO Operations						Corporate and Other						Total
Gas Distribution
Residential			$	960.3					$	290.7					$	—					$	1,251.0
Commercial			317.3						105.4						—						$	422.7
Industrial			73.1						39.9						—						$	113.0
Off-system			23.4						—						—						$	23.4
Wholesale			1.0						—						—						$	1.0
Miscellaneous(1)			12.5						10.5						—						$	23.0
Subtotal			$	1,387.6					$	446.5					$	—					$	1,834.1
Electric Generation and Power Delivery
Residential			$	—					$	300.7					$	—					$	300.7
Commercial			—						297.3						—						$	297.3
Industrial			—						235.6						—						$	235.6
Wholesale			—						17.5						—						$	17.5
Public Authority			—						4.0						—						$	4.0
Miscellaneous(1)			—						7.9						—						$	7.9
Subtotal			$	—					$	863.0					$	—					$	863.0
Total Customer Revenues**(2)**			1,387.6						1,309.5						—						2,697.1
Other Revenues**(3)**			53.5						40.1						0.3						93.9
Total Operating Revenues			$	1,441.1					$	1,349.6					$	0.3					$	2,791.0
(1)Amounts included in Columbia Operations primarily relate to earnings share mechanisms and late fees. Amounts included in NIPSCO Operations, primarily relate to revenue refunds, public repairs and property rentals. (2)Customer revenue amounts exclude intersegment revenues. See Note 17, "Business Segment Information," for discussion of intersegment revenues. (3)Amounts included in Columbia Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms. Amounts included in NIPSCO Operations primarily relate to alternative revenue programs including weather normalization adjustment mechanisms, MISO multi-value projects and revenue from non-jurisdictional transmission assets.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

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. A significant portion of our operations are subject to seasonal fluctuations in sales. During the heating season, primarily from November through March, revenues and receivables from gas sales are more significant than in other months. The balances of customer receivables as of June 30, 2025 and December 31, 2024 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, 2024			$	525.1					$	408.1
Balance as of June 30, 2025			519.6						235.8

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. 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. Internal and external inputs are used in our credit model including, but not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-offs, customer delinquencies, final bill data, and inflation. We continuously evaluate available information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or following 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 including, but not limited to, creditworthiness of overall population in service territories, adverse conditions impacting an industry sector, and current economic conditions.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

At each reporting period, we record expected credit losses to an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses as of June 30, 2025 and December 31, 2024 are presented in the table below:

(in millions)			Columbia Operations						NIPSCO Operations												Corporate and Other						Total
Balance as of January 1, 2025			$	9.8					$	13.9											$	—					$	23.7
Current period provisions			20.4						7.1												—						27.5
Write-offs charged against allowance			(23.1)						(5.5)												—						(28.6)
Recoveries of amounts previously written off			4.3						0.4												—						4.7
Balance as of June 30, 2025			$	11.4					$	15.9											$	—					$	27.3

(in millions)			Columbia Operations						NIPSCO Operations												Corporate and Other						Total
Balance as of January 1, 2024			$	10.2					$	11.9											$	0.8					$	22.9
Current period provisions			26.7						12.1												—						38.8
Write-offs charged against allowance			(43.9)						(11.0)												(0.8)						(55.7)
Recoveries of amounts previously written off			16.8						0.9												—						17.7
Balance as of December 31, 2024			$	9.8					$	13.9											$	—					$	23.7

4. Noncontrolling Interests

Variable Interest Entities. A VIE is an entity in which the controlling interest is determined through means other than a majority voting interest. NIPSCO is the managing member and operator of two wind JVs, Rosewater and Indiana Crossroads Wind, which have 102 MW and 302 MW of nameplate capacity, respectively. NIPSCO is also the managing member and operator of two solar JVs, Indiana Crossroads Solar and Dunns Bridge I, which have a nameplate capacity of 200 MW and 265 MW, respectively. We have determined that these JVs are VIEs. NIPSCO controls decisions that are significant to these entities' ongoing operations and economic results. Therefore, we have concluded that NIPSCO is the primary beneficiary and have consolidated all four entities.

Members of each respective JV include 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. NIPSCO and each tax equity partner contributed cash to the respective JV. Once the tax equity partner has earned their negotiated rate of return and have reached a stated contractual date, NIPSCO has the option to purchase the remaining interest in the respective JV, at fair market value, from the tax equity partner. NIPSCO has an obligation to purchase 100% of the electricity generated by each commercially operational JV.

We did not provide any financial or other support during the quarter that was not contractually required.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

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

(in millions)			June 30, 2025						December 31, 2024
Net property, plant and equipment			$	1,295.7					$	1,323.8
Current assets			60.9						65.0
Total assets(1)			1,356.6						1,388.8
Current liabilities			53.9						53.7
Asset retirement obligations			54.4						58.3
Finance lease obligations			40.2						40.4
Total liabilities(1)(2)			$	148.5					$	152.4

(1)The assets of each consolidated VIE can only be used to settle obligations of the respective consolidated VIE. The creditors of the liabilities of the VIEs do not have recourse to the general credit of the primary beneficiary. (2)In addition to the amounts disclosed above there is a de minimis amount of other noncurrent assets and liabilities at Rosewater as of June 30, 2025.

Voting Interest Entities. We retain a controlling financial interest in NIPSCO Holdings II and its subsidiaries and consolidate their financial results. The following table provides information about the contributions from and distributions to our NIPSCO minority interest holders included in our Condensed Statements of Consolidated Cash Flows (unaudited) and Condensed Statements of Consolidated Equity (unaudited).

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions)			2025						2024						2025						2024
Contributions from NIPSCO minority interest holders			$	99.5					$	59.7					$	134.3					$	59.7
Distributions to NIPSCO minority interest holders			26.9						20.2						44.4						20.2

5. Earnings Per Share

The calculations of basic and diluted EPS are based on the weighted average number of shares of common stock and potential common stock outstanding during the period. Diluted EPS includes the incremental effects of the various long-term incentive compensation plans and ATM forward sale agreements under the treasury stock method when the impact would be dilutive (See Note 6, "Equity").

We use the two-class method of computing earnings per share because we have participating securities in the form of non-vested restricted stock units with a non-forfeitable right to dividend equivalents, for which vesting is predicated solely on the passage of time. The calculation of earnings per share using the two-class method excludes income attributable to these participating securities from the numerator and excludes the dilutive impact of those shares from the denominator.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

The following table presents the calculation of our basic and diluted EPS:

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions, except per share amounts)			2025						2024						2025						2024
Numerator:
Net Income Available to Common Shareholders			$	102.2					$	85.8					$	577.0					$	430.1
Less: Income allocated to participating securities			0.3						0.4						1.1						0.7
Net Income Available to Common Shareholders - Basic			101.9						85.4						575.9						429.4
Net Income Available to Common Shareholders - Diluted			$	101.9					$	85.4					$	575.9					$	429.4
Denominator:
Average common shares outstanding - Basic			471.0						448.5						470.6						448.2
Dilutive potential common shares:
Shares contingently issuable under employee stock plans			1.0						0.7						1.2						0.8
Shares restricted under employee stock plans			0.1						0.3						0.5						0.3
ATM forward sale agreements			—						0.7						—						0.5
Average Common Shares - Diluted			472.1						450.2						472.3						449.8
Earnings per common share:
Basic			$	0.22					$	0.19					1.22						0.96
Diluted			$	0.22					$	0.19					1.22						0.95

6. Equity

ATM Program. In February 2024, we entered into eight separate equity distribution agreements pursuant to which we are able to sell up to an aggregate of $900.0 million of our common stock.

In February 2025, we executed a forward sale agreement, which allows us to issue a fixed number of shares at a price to be settled in the future. The forward purchaser under our forward sale agreement borrowed 2,000,000 shares from third parties, which the forward purchaser sold, through its affiliated agent, at a weighted average price of $40.10 per share. We may settle the forward sale agreement in shares, cash or net shares by December 31, 2025. Had we settled all the shares under the forward sale agreement at June 30, 2025, we would have received approximately $80.0 million, based on a net price of $40.00 per share.

In March 2025, we executed a forward sale agreement, which allows us to issue a fixed number of shares at a price to be settled in the future. The forward purchaser under our forward sale agreement borrowed 1,707,320 shares from third parties, which the forward purchaser sold, through its affiliated agent, at a weighted average price of $41.00 per share. We may settle the forward sale agreement in shares, cash or net shares by December 31, 2025. Had we settled all the shares under the forward sale agreement at June 30, 2025, we would have received approximately $69.8 million, based on a net price of $40.89 per share.

In June 2025, we executed a forward sale agreement, which allows us to issue a fixed number of shares at a price to be settled in the future. The forward purchaser under our forward sale agreement borrowed 2,518,393 shares from third parties, which the forward purchaser sold, through its affiliated agent, at a weighted average price of $39.71 per share. We may settle the forward sale agreement in shares, cash or net shares by December 31, 2025. Had we settled all the shares under the forward sale agreement at June 30, 2025, we would have received approximately $99.1 million, based on a net price of $39.34 per share.

As of June 30, 2025, the ATM program (inclusive of the forward sale agreements) had approximately $47.5 million of common stock available for issuance. The program expires on December 31, 2025.

Series B and B-1 Preferred Stock. On March 15, 2024, we redeemed all 20,000 outstanding shares of Series B Preferred Stock for a redemption price of $25,000 per share and all 20,000 outstanding shares of Series B-1 Preferred Stock for a redemption price of $0.01 per share or $500.0 million in total.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

There were no dividends declared per share for the Series B Preferred Stock during the three months ended June 30, 2025 and 2024. Dividends declared per share for the Series B Preferred Stock were zero and $406.25 during the six months ended June 30, 2025 and 2024, respectively.

7. 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.

Revolving Credit Facility. We maintain a revolving credit facility to fund ongoing working capital requirements, including the provision of liquidity support for our commercial paper program, the issuance of letters of credit and general corporate purposes. Our revolving credit facility has a program limit of $1.85 billion and is comprised of a syndicate of banks. We had no outstanding borrowings under this facility as of June 30, 2025 and December 31, 2024.

Commercial Paper Program. Our commercial paper program has a program limit of $1.85 billion. We had zero and $604.6 million of commercial paper outstanding with weighted-average interest rates of zero and 4.73% as of June 30, 2025 and December 31, 2024, respectively.

Accounts Receivable Transfer Programs. 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 consolidated special purpose entities. The three agreements expire between August 2025 and May 2026 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 June 30, 2025, the maximum amount of debt that could be borrowed related to our accounts receivable programs was $245.0 million.

We had no short-term borrowings related to the securitization transactions as of June 30, 2025 and December 31, 2024.

For the six months ended June 30, 2025 and 2024, zero and $337.6 million, respectively, were recorded as cash flows used for financing activities related to the change in short-term borrowings due to securitization transactions. 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.

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

8. Long-Term Debt

On March 27, 2025, we completed the issuance and sale of $750.0 million of 5.850% senior unsecured notes maturing in 2055, which resulted in approximately $739.6 million of net proceeds after discount and debt issuance costs.

On June 27, 2025, we completed the issuance and sale of an additional $750.0 million of 5.850% senior unsecured notes maturing in 2055 (the "2055 Notes"). The terms of the 2055 Notes, other than the issue date and the price to the public, are identical to the terms of, and constitute a reopening of, our 5.850% senior unsecured notes maturing in 2055 issued on March 27, 2025. With the incremental issuance, we now have $1.5 billion of 5.850% senior unsecured notes maturing in 2055. On June 27, 2025, we also completed the issuance and sale of $900.0 million of 5.350% senior unsecured notes maturing in 2035 (the "2035 Notes"). The issuances of the additional 2055 Notes and the 2035 Notes in June 2025 resulted in approximately $1.616 billion of total net proceeds after discount and debt issuance costs.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

9. Regulatory Matters

Regulatory Assets and Liabilities. We follow the accounting and reporting requirements of ASC Topic 980, which provides that regulated entities account for and report assets and liabilities consistent with the economic effect of regulatory rate-making procedures when the rates established are designed to recover the costs of providing the regulated service and it is probable that such rates will be charged and collected from customers. Certain expenses and credits subject to utility regulation or rate determination normally reflected in income or expense are deferred on the balance sheet and are recognized in the income statement as the related amounts are included in customer rates and recovered from or refunded to customers. We assess the probability of collection for all of our regulatory assets each period. The offset to the regulatory liability associated with our renewable investments included in regulated rates is recorded in "Depreciation and amortization" on the Condensed Statements of Consolidated Income (unaudited).

Renewable generation filings**.** In February 2025, NIPSCO filed a petition with the IURC to, after notice and hearing, issue an order modifying its February 13, 2023 order that approved a power purchase agreement related to Templeton and allow for NIPSCO to fully own Templeton. A final order is expected in October 2025.

NIPSCO GenCo filing. In January 2025, NIPSCO GenCo, a subsidiary of NIPSCO Holdings II, filed a declination of jurisdiction petition with the IURC related to the ownership, development, financing, construction and operation of generation facilities. This is an administrative filing and is a step in NIPSCO’s effort to set up a framework to accommodate megaload customers, including data centers. A settlement agreement among GenCo, NIPSCO, and a coalition of NIPSCO's largest industrial customers has been reached and filed with the IURC. The evidentiary hearing was held on July 1, and an order is expected in the third quarter of 2025.

NIPSCO Electric rate case filing. On February 7, 2025, NIPSCO and certain intervening parties filed a Joint Stipulation and Settlement Agreement with the IURC. The IURC issued an Order on June 26, 2025, approving the Settlement Agreement without modification. New rates will be implemented in multiple steps beginning in July 2025 through the beginning of 2026.

10. 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 limit volatility in the price of natural gas and manage interest rate exposure.

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

			June 30, 2025												December 31, 2024
(in millions)			Assets						Liabilities						Assets						Liabilities
Current(1)
Derivatives not designated as hedging instruments			$	16.6					$	1.7					$	9.1					$	2.3
Total			$	16.6					$	1.7					$	9.1					$	2.3
Noncurrent(2)
Derivatives not designated as hedging instruments			$	20.3					$	3.8					$	17.9					$	1.2
Total			$	20.3					$	3.8					$	17.9					$	1.2

(1)Current assets and liabilities are presented in "Other current assets" and "Other accruals", respectively, on the Condensed Consolidated Balance Sheets (unaudited).

(2)Noncurrent assets and liabilities are presented in "Deferred charges and other" and "Other noncurrent liabilities and deferred credits", respectively, on the Condensed Consolidated Balance Sheets (unaudited).

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Our derivative instruments are subject to enforceable master netting arrangements or similar agreements. No collateral was either received or posted related to our outstanding derivative positions at June 30, 2025. If the above gross asset and liability positions were presented net of amounts owed or receivable from counterparties, we would report a net asset position of $31.4 million and $23.5 million at June 30, 2025 and December 31, 2024, respectively.

Derivatives Not Designated as Hedging Instruments

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 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 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. At June 30, 2025 and December 31, 2024, we had 90.8 MMDth and 77.8 MMDth, respectively, of net energy derivative volumes outstanding related to our natural gas hedges.

NIPSCO has received IURC approval to lock in a fixed price for its natural gas customers using long-term forward purchase instruments and is limited to 20% of NIPSCO's average annual GCA purchase volume. As of June 30, 2025, the remaining terms of these instruments range from one to seven years. Likewise, Columbia of Pennsylvania has received approval for a 24-month rolling hedge program. The hedging program was executed in December 2023, with an effective date of April 1, 2024 and will continue in perpetuity. The program is designed to financially hedge approximately 20% of the customers' annual demand. All gains and losses on these derivative contracts are deferred as regulatory liabilities or assets and are remitted to or collected from customers through the relevant cost recovery mechanism.

The following table summarizes the gains and losses associated with the commodity price risk programs deferred as regulatory assets and liabilities:

(in millions)			June 30, 2025						December 31, 2024
Regulatory Assets
Losses on commodity price risk programs			$	6.9					$	6.5
Regulatory Liabilities
Gains on commodity price risk programs			40.1						28.7

Our derivative instruments measured at fair value as of June 30, 2025 and December 31, 2024 do not contain any credit-risk-related contingent features.

Derivatives Designated as Hedging Instruments

Interest rate risk management. As of June 30, 2025 and December 31, 2024 we had no active interest rate swap positions. The overall net loss related to our multiple settled interest rate swaps is recorded in AOCI. We amortize the net loss over the life of the debt associated with these swaps as we recognize interest expense. These amounts were immaterial for the three and six months ended June 30, 2025 and 2024 and are recorded in "Interest expense, net" on the Condensed Statements of Consolidated Income (unaudited). Amounts expected to be reclassified to earnings during the next twelve months are immaterial. See Note 16, "Accumulated Other Comprehensive Loss," for additional information.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

11. 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 June 30, 2025 and December 31, 2024:

Recurring Fair Value Measurements June 30, 2025 (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 June 30, 2025
Assets
U.S. Treasury debt securities(1)			$	1.5					$	—					$	—					$	1.5
Risk management assets			—						36.9						—						36.9
Available-for-sale debt securities			—						144.9						—						144.9
Equity securities(2)(3)			$	6.1					$	—					$	—					$	6.1
Total			$	7.6					$	181.8					$	—					$	189.4
Liabilities
Risk management liabilities			$	—					$	5.5					$	—					$	5.5
Total			$	—					$	5.5					$	—					$	5.5

(1)Treasury bills are presented in "Cash and cash equivalents" and "Restricted cash" on the Consolidated Balance Sheets.

(2)Equity securities are valued using market prices in active markets. Level 1 instrument valuations are obtained from real-time quotes for transactions in active exchange markets involving identical assets. Equity securities are presented in "Other Investments" on the Consolidated Balance Sheets.

(3)As of June 30, 2025, the investment cost of equity securities was $5.9 million, gross unrealized gains were $0.2 million, and the fair value was $6.1 million.

Recurring Fair Value Measurements December 31, 2024 (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, 2024
Assets
U.S. Treasury debt securities(1)			$	80.1					$	—					$	—					$	80.1
Risk management assets			—						27.0						—						27.0
Available-for-sale debt securities			—						86.7						—						86.7
Total			$	80.1					$	113.7					$	—					$	193.8
Liabilities
Risk management liabilities			$	—					$	3.5					$	—					$	3.5
Total			$	—					$	3.5					$	—					$	3.5

(1)Treasury bills are presented in "Cash and cash equivalents" and "Restricted cash" on the Consolidated Balance Sheets.

Risk Management Assets and Liabilities. Risk management assets and liabilities include exchange-traded NYMEX futures and NYMEX options and non-exchange-based forward purchase contracts.

Level 1- 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. These financial assets and liabilities are deemed to be cleared and settled daily by NYMEX as the related cash collateral is posted with the exchange. As a result of this exchange rule, NYMEX derivatives are considered to have no fair value at the balance sheet date for financial reporting purposes, and are presented in Level 1 net of posted cash; however, the derivatives remain outstanding and are subject to future commodity price fluctuations until they are settled in accordance with their contractual terms.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Level 2- 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.

Level 3- 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 that reduce exposures. As of June 30, 2025 and December 31, 2024, 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.

NIPSCO and Columbia of Pennsylvania have entered into long-term forward natural gas purchase instruments to lock in a fixed price for 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 10, "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.

Our available-for-sale debt securities impairments are recognized periodically using an allowance approach. At each reporting date, we utilize a quantitative and qualitative review process to assess the impairment of available-for-sale debt securities at the individual security level. For securities in a loss position, we evaluate our intent to sell or whether it is more-likely-than-not that we will be required to sell the security prior to the recovery of its amortized cost. If either criteria is met, the loss is recognized in earnings immediately, with the offsetting entry to the carrying value of the security. If both criteria are not met, 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 certain amounts recorded in the allowance for credit losses are deemed uncollectible, the allowance on the uncollectible portion will be 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 will be recognized immediately in earnings. Continuous credit monitoring and portfolio credit balancing mitigates our risk of credit losses on our available-for-sale debt securities.

Other Equity Investments. Investments measured at net asset value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. These investments represent holdings in a single private investment fund that are redeemable at the election of the holder. As of June 30, 2025, the Company holds $11.8 million of equity investments measured at net asset value.

The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at June 30, 2025 and December 31, 2024 were:

June 30, 2025 (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			4.3						$	—					$	—					$	—					$	4.3
Corporate/Other debt securities			$	143.6					$	1.4					$	(4.3)					$	(0.1)					$	140.6
Total			$	147.9					$	1.4					$	(4.3)					$	(0.1)					$	144.9
December 31, 2024 (in millions)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses**(2)**						Allowance for Credit Losses						Fair Value
Available-for-sale debt securities
Corporate/Other debt securities			$	91.9					$	0.5					$	(5.6)					$	(0.1)					$	86.7
Total			$	91.9					$	0.5					$	(5.6)					$	(0.1)					$	86.7

(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 $2.7 million and $61.6 million at June 30, 2025.

(2)Fair value of Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $70.1 million at December 31, 2024.

The cost of maturities sold is based upon specific identification. Net realized gains and losses on available-for-sale securities were de minimis for the three and six months ended June 30, 2025, and $0.1 million and $0.5 million for the three and six months ended June 30, 2024.

Non-recurring Fair Value Measurements

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

B. Other Fair Value Disclosures for Financial Instruments. The carrying amount of cash and cash equivalents, restricted cash, notes receivable, 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 June 30, 2025, 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 June 30, 2025						Estimated Fair Value as of June 30, 2025						Carrying Amount as of Dec. 31, 2024						Estimated Fair Value as of Dec. 31, 2024
Long-term debt (including current portion)			$	15,756.0					$	15,106.3					$	13,355.7					$	12,505.2

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

12. Goodwill

The following presents our goodwill balance allocated by segment as of June 30, 2025:

(in millions)						Columbia Operations						NIPSCO Operations						Corporate and Other						Total
Goodwill						$	1,468.1					$	17.8					$	—					$	1,485.9

For our annual goodwill impairment analysis performed as of May 1, 2025, we performed a qualitative "step 0" assessment and determined that it was more likely than not that the estimated fair value of a reporting unit substantially exceeded its carrying value of our reporting unit. For this test, we assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting unit as compared to its baseline May 1, 2024 "step 1" fair value measurement. There have been no impairments recorded during the periods presented.

13. Income Taxes

Our interim effective tax rates reflect the estimated annual effective tax rates for 2025 and 2024 applied to year-to-date pretax income, adjusted for tax expense associated with certain discrete items. The effective tax rates for the three months ended June 30, 2025 and 2024 were 19.1% and 14.6%, respectively. The effective tax rates for the six months ended June 30, 2025 and 2024 were 17.1% and 15.7%, respectively. These effective tax rates differ from the federal statutory tax rate of 21% primarily due to net income attributable to noncontrolling interest, amortization of excess deferred income taxes, federal tax credits net of deferred regulatory liabilities, state income taxes, and other permanent book-to-tax differences.

The increase in the three month effective tax rate of 4.5% in 2025 compared to 2024 is primarily driven by higher state income taxes and lower AFUDC equity, partially offset by the increase in federal tax credits.

The increase in the six month effective tax rate of 1.4% in 2025 compared to 2024 is primarily driven by higher state income taxes and lower AFUDC equity.

As of June 30, 2025, there have been no material changes to our unrecognized tax benefits or possible changes that could reasonably be expected to occur during the next twelve months. See Note 15 to the Company’s Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2024, for a discussion of these unrecognized tax benefits.

14. Pension and Other Postemployment 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. Certain active 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 six months ended June 30, 2025 and 2024, we contributed $1.0 million and $1.3 million, respectively, to our pension plans and $10.5 million and $10.7 million, respectively, to our OPEB plans.

Table of Contents****`

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 and six months ended June 30, 2025 and 2024:

			Pension Benefits												OPEB
Three Months Ended June 30, (in millions)			2025						2024						2025						2024
Components of Net Periodic Benefit Cost**(1)**
Service cost			$	4.9					$	5.5					$	1.0					$	1.3
Interest cost			16.0						16.3						5.6						5.5
Expected return on assets			(23.1)						(23.8)						(4.2)						(4.0)
Amortization of prior service credit			—						—						(0.4)						(0.4)
Recognized actuarial loss			6.4						7.2						0.4						0.8
Total Net Periodic Benefit Cost			$	4.2					$	5.2					$	2.4					$	3.2
(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).

			Pension Benefits												OPEB
Six Months Ended June 30, (in millions)			2025						2024						2025						2024
Components of Net Periodic Benefit Cost**(1)**
Service cost			$	9.8					$	10.9					$	2.0					$	2.6
Interest cost			32.0						32.6						11.2						10.9
Expected return on assets			(46.2)						(47.6)						(8.4)						(8.0)
Amortization of prior service credit			—						—						(0.8)						(0.8)
Recognized actuarial loss			12.8						14.4						0.8						1.6
Total Net Periodic Benefit Cost			$	8.4					$	10.3					$	4.8					$	6.3
(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).

15. 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 June 30, 2025 and December 31, 2024, we had issued stand-by letters of credit of $9.4 million for the benefit of third parties.

We provide guarantees related to our future performance under BTAs for our renewable generation projects. At June 30, 2025 and December 31, 2024, our guarantees for multiple BTAs totaled $86.5 million and $1,127.5 million, respectively. The amount of each guaranty will decrease upon the substantial completion of the construction of the facilities. See ''- D. Other Matters - Generation Transition,'' below for more information.

We provide guarantees related to some of our rail and pipeline service agreements. As of June 30, 2025 and December 31, 2024, if we do not meet our contractual obligations under the terms of these agreements we would be required to pay up to a maximum of $52.0 million and $61.7 million, respectively.

B. Legal Proceedings. From time to time, various legal and regulatory claims and proceedings are pending or threatened against the Company and its subsidiaries. While the amounts claimed may be substantial, the Company is unable to predict with certainty the ultimate outcome of such claims and proceedings. The Company establishes reserves whenever it believes it to be appropriate for pending litigation matters. However, the actual results of resolving the pending litigation matters may be substantially higher than the amounts reserved. If one or more 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. Due to the inherent uncertainty of

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

litigation, there can be no assurance that the resolution of any particular claim, proceeding or investigation would not have a material adverse effect on our results of operations, financial position or liquidity.

Other Claims and Proceedings. We are also party to other claims, regulatory and legal proceedings arising in the ordinary course of business in each state in which we have operations, and based upon an investigation of these matters and discussion with legal counsel, we believe the ultimate outcome of such other legal proceedings to be individually, or in aggregate, not material at this time.

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 and asset retirement costs, further described below, to be recoverable through rates.

As of June 30, 2025 and December 31, 2024, we had recorded a liability of $85.8 million and $91.8 million, respectively, to cover environmental remediation at various sites. This liability is included in "Other accruals" and "Other noncurrent liabilities and deferred credits" in the Condensed Consolidated Balance Sheets (unaudited). 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 CERCLA 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. At this time, we cannot estimate the full cost of remediating properties that have not yet been investigated, but it is possible that the future costs could be material to the Condensed Consolidated Financial Statements (unaudited).

MGP. We maintain a program to identify and investigate former MGP sites where our subsidiaries or predecessors may have liability. The program has identified 51 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 perform an annual update of the model in the second quarter each year. No material changes to the estimated future remediation costs were identified during the update completed as of June 30, 2025. Our total estimated liability related to the facilities subject to remediation was $79.1 million and $86.4 million at June 30, 2025 and December 31, 2024, respectively. The liability represents our best estimate of the probable cost to remediate the MGP sites. Our model indicates that it is reasonably possible that remediation costs could vary by as much as $16.7 million and $16.3 million at June 30, 2025 and December 31, 2024, respectively, 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. NIPSCO continues to meet the compliance requirements established by the EPA for the regulation of CCRs. The CCR rule requirements currently in effect required 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.

On May 8, 2024, the EPA finalized changes to the current CCR regulations ("Legacy CCR Rule"), which address inactive surface impoundments at inactive facilities, referred to as legacy impoundments, and CCR management units ("CCRMUs") at

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

inactive and active facilities. The rule largely requires these newly regulated units to conform to existing requirements, such as groundwater monitoring, closure requirements, and post-closure care. In the second quarter of 2025, we accrued an additional $38.8 million to cover probable and estimable compliance activities associated with the Legacy CCR Rule. A direct final rule that was issued on July 17, 2025, revised the facility evaluation report due date to February 8, 2027. NIPSCO continues to assess whether existing legal obligations associated with the retirement of certain facilities must be revised and to estimate probable additional required asset retirement costs. NIPSCO expects to receive recovery of any such costs through existing and future depreciation rates.

D. Other Matters.

Generation Transition. NIPSCO has executed several BTAs with developers to construct renewable generation facilities. In October 2024, NIPSCO contracted with a developer to convert the previously approved Templeton PPA to a BTA and in February 2025 filed a CPCN with the IURC seeking approval of the full ownership BTA structure. In addition to IURC approval of Templeton, NIPSCO's purchase obligation under Templeton and Gibson is dependent on timely completion of construction. Certain agreements require NIPSCO to make partial payments upon the developer's completion of significant construction milestones.

In January 2025, the Fairbanks project achieved mechanical completion, resulting in NIPSCO making a $336.6 million payment to the developer. In May 2025, the Fairbanks project achieved substantial completion, resulting in NIPSCO making a $141.4 million payment to the developer in June 2025.

In January 2025, the Dunns Bridge II project achieved substantial completion, resulting in NIPSCO making a $217.6 million payment to the developer in February 2025.

In June 2025, the Gibson project achieved mechanical completion, resulting in NIPSCO making a $262.4 million payment to the developer.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

16. Accumulated Other Comprehensive Loss

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

(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 April 1, 2025			$	(3.2)					$	(13.3)					$	(12.7)					$	(29.2)
Other comprehensive income before reclassifications			1.0						—						(0.1)						0.9
Amounts reclassified from accumulated other comprehensive loss			—						(0.1)						0.2						0.1
Net current-period other comprehensive income (loss)			1.0						(0.1)						0.1						1.0
Balance as of June 30, 2025			$	(2.2)					$	(13.4)					$	(12.6)					$	(28.2)
(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, 2025			$	(4.0)					$	(13.2)					$	(13.2)					$	(30.4)
Other comprehensive income (loss) before reclassifications			1.8						—						0.2						2.0
Amounts reclassified from accumulated other comprehensive loss			—						(0.2)						0.4						0.2
Net current-period other comprehensive income (loss)			1.8						(0.2)						0.6						2.2
Balance as of June 30, 2025			$	(2.2)					$	(13.4)					$	(12.6)					$	(28.2)

(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 April 1, 2024			$	(7.6)					$	(12.9)					$	(13.3)					$	(33.8)
Other comprehensive loss before reclassifications			(0.1)						(0.2)						—						(0.3)
Amounts reclassified from accumulated other comprehensive loss			0.1						0.1						0.3						0.5
Net current-period other comprehensive income (loss)			—						(0.1)						0.3						0.2
Balance as of June 30, 2024			$	(7.6)					$	(13.0)					$	(13.0)					$	(33.6)
(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, 2024			$	(7.3)					$	(12.8)					$	(13.5)					$	(33.6)
Other comprehensive income (loss) before reclassifications			(0.7)						(0.4)						—						(1.1)
Amounts reclassified from accumulated other comprehensive loss			0.4						0.2						0.5						1.1
Net current-period other comprehensive income (loss)			(0.3)						(0.2)						0.5						—
Balance as of June 30, 2024			$	(7.6)					$	(13.0)					$	(13.0)					$	(33.6)

(1)All amounts are net of tax. Amounts in parentheses indicate debits.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

17. Business Segment Information

Our reportable segments reflect the manner in which our business is managed and our resources are allocated. Our operations are divided into two primary reportable segments, the Columbia Operations and the NIPSCO Operations segments. Columbia Operations aggregates the results of the fully regulated and wholly owned subsidiaries of NiSource Gas Distribution Group, Inc. (a holding company that owns Columbia of Kentucky, Columbia of Maryland, Columbia of Ohio, Columbia of Pennsylvania, and Columbia of Virginia). Each Columbia distribution company is an operating segment which we aggregate to form the Columbia Operations reportable segment. NIPSCO Operations includes the results of NIPSCO Holdings I and its majority-owned subsidiaries, including NIPSCO, which has fully regulated gas and electric operations in northern Indiana.

The remainder of our operations, which are not significant enough on a stand-alone basis to warrant treatment as a reportable segment, are presented as "Corporate and Other" and primarily are comprised of interest expense on holding company debt, and unallocated corporate costs and activities. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues. The following table provides information about our reportable segments. We use operating income as the primary measurement of performance for each of the reportable segments and make decisions on financing, dividends and taxes at the corporate level on a consolidated basis. We provide this measure to our CODM, the CEO, who utilizes it to assess performance and allocation of resources at the operating segment level based on budget-to-actual and actual-to-actual variances. 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 June 30, 2025
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	601.2					$	680.6					$	1,281.8
Intersegment Revenue			3.5						0.2						3.7
Total Operating Revenue			$	604.7					$	680.8					$	1,285.5
Cost of energy			110.4						151.4						261.8
O&M			207.7						211.0						418.7
Depreciation			111.7						165.9						277.6
Total other taxes			52.4						18.1						70.5
Other segment items(1)			0.3						0.4						0.7
Operating Income			$	122.2					$	134.0					$	256.2

(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Three Months Ended June 30, 2024
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	487.4					$	597.2					$	1,084.6
Intersegment Revenue			3.1						0.2						3.3
Total Operating Revenue			490.5						597.4						1,087.9
Cost of energy			56.3						108.4						164.7
O&M			191.3						187.5						378.8
Depreciation			99.4						143.0						242.4
Total other taxes			46.9						16.3						63.2
Other segment items(1)			—						(0.1)						(0.1)
Operating Income			$	96.6					$	142.3					$	238.9

(1)Other segment items consists of (Gain) on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.

Six Months Ended June 30, 2025
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	1,841.8					$	1,622.0					$	3,463.8
Intersegment Revenue			6.7						0.5						7.2
Total Operating Revenue			$	1,848.5					$	1,622.5					$	3,471.0
Cost of energy			490.2						419.1						909.3
O&M			450.7						413.0						863.7
Depreciation			219.9						307.2						527.1
Total other taxes			119.4						36.6						156.0
Other segment items(1)			0.3						0.7						1.0
Operating Income			$	568.0					$	445.9					$	1,013.9

(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Six Months Ended June 30, 2024
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	1,441.1					$	1,349.6					$	2,790.7
Intersegment Revenue			6.3						0.5						6.8
Total Operating Revenue			1,447.4						1,350.1						2,797.5
Cost of energy			285.1						304.6						589.7
O&M			402.0						378.8						780.8
Depreciation			197.6						275.7						473.3
Total other taxes			104.1						32.4						136.5
Other segment items(1)			—						(0.1)						(0.1)
Operating Income			$	458.6					$	358.7					$	817.3

(1)Other segment items consists of (Gain) on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.

The following table provides information about the assets of our reportable segments included in the Condensed Consolidated Balance Sheets (unaudited):

(in millions)			June 30, 2025						December 31, 2024
Assets
Columbia Operations			$	14,982.7					$	14,769.5
NIPSCO Operations			17,511.3						15,823.5
Corporate and Other			1,534.9						1,195.1
Consolidated Assets			$	34,028.9					$	31,788.1

To reconcile the segment tables above to consolidated NiSource:

Three Months Ended June 30, 2025
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	1,285.5					$	144.6					$	(147.1)					$	1,283.0
Operating Income			256.2						6.7						—						262.9

Three Months Ended June 30, 2024
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	1,087.9					$	139.1					$	(142.3)					$	1,084.7
Operating Income			238.9						(1.9)						—						237.0

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

Six Months Ended June 30, 2025
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	3,471.0					$	290.0					$	(294.8)					$	3,466.2
Operating Income			1,013.9						8.4						—						1,022.3

Six Months Ended June 30, 2024
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	2,797.5					$	279.2					$	(285.7)					$	2,791.0
Operating Income			817.3						3.1						—						820.4

18. Other, Net

The following table displays the components of Other, Net included on the Condensed Statements of Consolidated Income (unaudited):

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions)			2025						2024						2025						2024
Interest income			$	1.5					$	1.9					$	3.5					$	4.4
AFUDC equity			8.6						13.3						17.8						24.6
Pension and other postretirement non-service cost			(1.6)						(2.1)						(5.4)						(4.3)
Tax penalties			(8.1)						—						(9.2)						—
Miscellaneous			0.1						(0.1)						(0.4)						(2.5)
Total Other, net			$	0.5					$	13.0					$	6.3					$	22.2

Table of Contents****`

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

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

19. Supplemental Disclosures of Cash Flow Information

The following table displays the components of Working Capital on the Condensed Statements of Consolidated Cash Flows (unaudited):

			Six Months Ended June 30,
(in millions)			2025						2024
Accounts receivable			$	185.6					$	238.0
Inventories			20.9						118.6
Accounts payable			(146.9)						(160.6)
Customer deposits and credits			(108.9)						(106.7)
Taxes accrued			(0.7)						1.3
Interest accrued			20.5						10.0
Exchange gas receivable/payable			73.8						(116.9)
Other accruals			(17.6)						(6.1)
Prepayments and other current assets			(28.4)						(52.1)
Accrued compensation and employee benefits			(63.1)						(41.7)
Total change in working capital			$	(64.8)					$	(116.2)

			Six Months Ended June 30,
(in millions)			2025						2024
Non-cash transactions:
Capital expenditures included in current liabilities			$	426.6					$	283.6
Dividends declared but not paid			135.1						120.0

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