ALLIANT ENERGY CORP

For the period ended Jun 30, 2026. Filed Jul 31, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2026 · Filed Jul 31, 2026

LNT$73.46+1.1%Stored close · as of Nov 9, 2026

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Contents

Interstate Power and Light Company

For the Three Months · For the Six Months
	Ended June 30,		Ended June 30,
	2026	2025	2026	2025
(in millions)
Revenues:
Electric utility	$431	$418	$867	$848
Gas utility	43	40	166	158
Steam and other	1	11	3	24
Total revenues	475	469	1,036	1,030
Operating expenses:
Electric production fuel and purchased power	45	40	110	107
Electric transmission service	98	100	202	207
Cost of gas sold	22	17	96	81
Other operation and maintenance	108	84	195	169
Depreciation and amortization	119	115	239	230
Taxes other than income taxes	16	15	30	29
Total operating expenses	408	371	872	823
Operating income	67	98	164	207
Other (income) and deductions:
Interest expense	57	52	114	99
Allowance for funds used during construction	(21)	(13)	(40)	(22)
Other	(1)	(2)	(3)	(2)
Total other (income) and deductions	35	37	71	75
Income before income taxes	32	61	93	132
Income tax benefit	(33)	(37)	(66)	(77)
Net income	$65	$98	$159	$209

Earnings per share data is not disclosed given Alliant Energy Corporation is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented.

	June 30,2026	December 31,2025
(in millions, except pershare and share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$12	$7
Accounts receivable, less allowance for expected credit losses	117	185
Production fuel, at weighted average cost	25	18
Gas stored underground, at weighted average cost	12	24
Materials and supplies, at weighted average cost	118	111
Regulatory assets	65	59
Other	94	58
Total current assets	443	462
Property, plant and equipment, net	10,808	10,436
Other assets:
Regulatory assets	1,582	1,557
Deferred charges and other	39	40
Total other assets	1,621	1,597
Total assets	$12,872	$12,495

LIABILITIES AND EQUITY
Current liabilities:
Commercial paper	$77	$88
Accounts payable	302	232
Accounts payable to associated companies	47	45
Accrued taxes	66	53
Accrued interest	46	47
Regulatory liabilities	34	41
Other	89	80
Total current liabilities	661	586
Long-term debt, net	4,732	4,680
Other liabilities:
Deferred tax liabilities	1,314	1,278
Regulatory liabilities	517	545
Pension and other benefit obligations	26	30
Other	549	532
Total other liabilities	2,406	2,385
Commitments and contingencies (Note 12)
Equity:
Interstate Power and Light Company common equity:
Common stock - $2.50 par value - 24,000,000 shares authorized; 13,370,788 shares outstanding	33	33
Additional paid-in capital	3,647	3,497
Retained earnings	1,393	1,314
Total Interstate Power and Light Company common equity	5,073	4,844
Total liabilities and equity	$12,872	$12,495

	For the Six Months
	Ended June 30,
	2026	2025
(in millions)
Cash flows from operating activities:
Net income	$159	$209
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	239	230
Deferred tax benefit and tax credits	(59)	(59)
Other	(28)	(14)
Other changes in assets and liabilities:
Accounts receivable	(218)	(273)
Derivative assets	(41)	(21)
Regulatory assets	(42)	(47)
Accounts payable	38	7
Deferred income taxes (a)	70	98
Other	22	(22)
Net cash flows from operating activities	140	108
Cash flows used for investing activities:
Construction and acquisition expenditures	(491)	(628)
Cash receipts on sold receivables	264	198
Other	(15)	(11)
Net cash flows used for investing activities	(242)	(441)
Cash flows from financing activities:
Common stock dividends	(80)	(180)
Capital contributions from parent	150	145
Proceeds from issuance of long-term debt	—	594
Net change in commercial paper	39	(50)
Other	(2)	(1)
Net cash flows from financing activities	107	508
Net increase in cash, cash equivalents and restricted cash	5	175
Cash, cash equivalents and restricted cash at beginning of period	7	29
Cash, cash equivalents and restricted cash at end of period	$12	$204
Supplemental cash flows information:
Cash (paid) received during the period for:
Interest	($115)	($97)
Income taxes, net (a)	$79	$68
Significant non-cash investing and financing activities:
Accrued capital expenditures	$137	$149
Beneficial interest obtained in exchange for securitized accounts receivable	$95	$235

(a)2026 and 2025 include $58 million and $73 million, respectively, of proceeds from renewable tax credits transferred to other corporate taxpayers.

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