ALLIANT ENERGY CORP

For the period ended Mar 31, 2026. Filed May 1, 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.

Mar 31, 2026 · Filed May 1, 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 March 31, 2026	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$437	$451	$888	N/A	$888
Gas utility revenues	122	149	271	N/A	271
Other revenues	2	—	2	$23	25
Total revenues	561	600	1,161	23	1,184
Electric production fuel and purchased power expense	64	104	168	N/A	168
Electric transmission service expense	104	55	159	N/A	159
Cost of gas sold expense	74	99	173	N/A	173
Other operation and maintenance expense	87	82	169	11	180
Other segment items:
Depreciation and amortization expense	120	100	220	3	223
Interest expense	57	48	105	37	142
Equity income from unconsolidated investments, net	—	(1)	(1)	(21)	(22)
Income tax benefit	(32)	(8)	(40)	(21)	(61)
Other (a)	(7)	4	(3)	1	(2)
Net income	94	117	211	13	224
Total assets	12,641	10,787	23,428	1,385	24,813
Investments in equity method subsidiaries	4	20	24	680	704
Construction and acquisition expenditures	198	144	342	72	414

	Utility
Total · Alliant
Three Months Ended March 31, 2025 · Reportable · Energy
IPL · WPL · Segments · Other · Consolidated
Electric utility revenues	$430	$423	$853	N/A	$853
Gas utility revenues	118	122	240	N/A	240
Other revenues	12	1	13	$22	35
Total revenues	560	546	1,106	22	1,128
Electric production fuel and purchased power expense	67	108	175	N/A	175
Electric transmission service expense	108	50	158	N/A	158
Cost of gas sold expense	65	72	137	N/A	137
Other operation and maintenance expense	82	67	149	11	160
Other segment items:
Depreciation and amortization expense	115	93	208	3	211
Interest expense	47	43	90	29	119
Equity income from unconsolidated investments, net	—	—	—	(13)	(13)
Income tax benefit	(40)	(5)	(45)	(2)	(47)
Other (a)	6	8	14	1	15
Net income (loss)	110	110	220	(7)	213
Total assets	11,540	10,101	21,641	1,210	22,851
Investments in equity method subsidiaries	5	17	22	611	633
Construction and acquisition expenditures	376	178	554	28	582

(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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