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

. Segments of Business

NOTE 13. SEGMENTS OF BUSINESS

Alliant Energy’stwo reportable segments are IPL and WPL. Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s reportable segments and reconciliation to consolidated amounts, was as follows (in millions):

	Utility
Total · Alliant
Reportable · Energy
Three Months Ended June 30, 2026	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$431	$430	$861	N/A	$861
Gas utility revenues	43	39	82	N/A	82
Other revenues	1	1	2	$26	28
Total revenues	475	470	945	26	971
Electric production fuel and purchased power expense	45	87	132	N/A	132
Electric transmission service expense	98	57	155	N/A	155
Cost of gas sold expense	22	15	37	N/A	37
Other operation and maintenance expense	108	87	195	14	209
Other segment items:
Depreciation and amortization expense	119	98	217	3	220
Interest expense	57	49	106	37	143
Equity income from unconsolidated investments, net	—	(1)	(1)	(42)	(43)
Income tax benefit	(33)	(6)	(39)	(13)	(52)
Other (a)	(6)	6	—	—	—
Net income	65	78	143	27	170
Total assets (as of June 30, 2026)	12,872	11,046	23,918	1,400	25,318
Investments in equity method subsidiaries (as of June 30, 2026)	4	20	24	713	737
Construction and acquisition expenditures	293	278	571	37	608

	Utility
Total · Alliant
Three Months Ended June 30, 2025 · Reportable · Energy
IPL · WPL · Segments · Other · Consolidated
Electric utility revenues	$418	$433	$851	N/A	$851
Gas utility revenues	40	36	76	N/A	76
Other revenues	11	—	11	$23	34
Total revenues	469	469	938	23	961
Electric production fuel and purchased power expense	40	110	150	N/A	150
Electric transmission service expense	100	51	151	N/A	151
Cost of gas sold expense	17	13	30	N/A	30
Other operation and maintenance expense	84	72	156	12	168
Other segment items:
Depreciation and amortization expense	115	90	205	3	208
Interest expense	52	43	95	29	124
Equity income from unconsolidated investments, net	—	(1)	(1)	(9)	(10)
Income tax benefit	(37)	(5)	(42)	(1)	(43)
Other (a)	—	9	9	—	9
Net income (loss)	98	87	185	(11)	174
Total assets (as of June 30, 2025)	12,180	10,236	22,416	1,334	23,750
Investments in equity method subsidiaries (as of June 30, 2025)	5	18	23	622	645
Construction and acquisition expenditures	252	170	422	61	483

	Utility
Total · Alliant
Reportable · Energy
Six Months Ended June 30, 2026	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$867	$881	$1,748	N/A	$1,748
Gas utility revenues	166	187	353	N/A	353
Other revenues	3	2	5	$49	54
Total revenues	1,036	1,070	2,106	49	2,155
Electric production fuel and purchased power expense	110	191	301	N/A	301
Electric transmission service expense	202	112	314	N/A	314
Cost of gas sold expense	96	114	210	N/A	210
Other operation and maintenance expense	195	169	364	26	390
Other segment items:
Depreciation and amortization expense	239	198	437	5	442
Interest expense	114	97	211	74	285
Equity income from unconsolidated investments, net	—	(1)	(1)	(64)	(65)
Income tax benefit	(66)	(15)	(81)	(33)	(114)
Other (a)	(13)	10	(3)	1	(2)
Net income	159	195	354	40	394
Construction and acquisition expenditures	491	422	913	109	1,022

	Utility
Total · Alliant
Six Months Ended June 30, 2025 · Reportable · Energy
IPL · WPL · Segments · Other · Consolidated
Electric utility revenues	$848	$855	$1,703	N/A	$1,703
Gas utility revenues	158	158	316	N/A	316
Other revenues	24	1	25	$44	69
Total revenues	1,030	1,014	2,044	44	2,088
Electric production fuel and purchased power expense	107	218	325	N/A	325
Electric transmission service expense	207	101	308	N/A	308
Cost of gas sold expense	81	86	167	N/A	167
Other operation and maintenance expense	169	137	306	21	327
Other segment items:
Depreciation and amortization expense	230	183	413	7	420
Interest expense	99	86	185	58	243
Equity income from unconsolidated investments, net	—	(1)	(1)	(22)	(23)
Income tax benefit	(77)	(10)	(87)	(4)	(91)
Other (a)	5	16	21	4	25
Net income (loss)	209	198	407	(20)	387
Construction and acquisition expenditures	628	348	976	89	1,065

(a)Other segment items for each reportable segment include allowance for funds used during construction (AFUDC), taxes other than income taxes, interest income, and other miscellaneous income and deductions.

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