ALLIANT ENERGY CORP

For the period ended Sep 30, 2025. Filed Nov 7, 2025.

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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.

Sep 30, 2025 · Filed Nov 7, 2025

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

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Contents

. Segments of Business

NOTE 14. SEGMENTS OF BUSINESS

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s reportable segments, which represents the services provided to their customers, and reconciliation to consolidated amounts, was as follows (in millions):

	Utility
Total · Alliant
Reportable · Energy
Three Months Ended September 30, 2025	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$608	$516	$1,124	N/A	$1,124
Gas utility revenues	27	24	51	N/A	51
Other revenues	12	—	12	$23	35
Total revenues	647	540	1,187	23	1,210
Electric production fuel and purchased power expense	106	133	239	N/A	239
Electric transmission service expense	115	51	166	N/A	166
Cost of gas sold expense	7	5	12	N/A	12
Other operation and maintenance expense	108	84	192	12	204
Other segment items:
Depreciation and amortization expense	116	92	208	3	211
Interest expense	54	43	97	31	128
Equity income from unconsolidated investments, net	—	(1)	(1)	(17)	(18)
Income tax expense (benefit)	(21)	1	(20)	2	(18)
Other (a)	(3)	9	6	(1)	5
Net income (loss)	165	123	288	(7)	281
Total assets (as of September 30, 2025)	12,433	10,331	22,764	1,863	24,627
Investments in equity method subsidiaries (as of September 30, 2025)	5	19	24	644	668
Construction and acquisition expenditures	348	163	511	72	583

	Utility
Total · Alliant
Three Months Ended September 30, 2024 (amounts may not foot due to rounding) · Reportable · Energy
IPL · WPL · Segments · Other · Consolidated
Electric utility revenues	$523	$476	$999	N/A	$999
Gas utility revenues	27	22	49	N/A	49
Other revenues	11	1	12	$21	33
Total revenues	561	499	1,060	21	1,081
Electric production fuel and purchased power expense	79	112	191	N/A	192
Electric transmission service expense	115	49	164	N/A	165
Cost of gas sold expense	8	5	13	N/A	13
Other operation and maintenance expense	96	72	168	6	174
Other segment items:
Depreciation and amortization expense	100	91	191	4	195
Interest expense	44	42	86	28	114
Equity income from unconsolidated investments, net	—	(1)	(1)	(13)	(14)
Income tax expense (benefit)	(68)	4	(64)	2	(62)
Other (a)	(3)	11	8	3	9
Net income (loss)	190	114	304	(9)	295
Total assets (as of September 30, 2024)	11,680	9,938	21,618	1,211	22,829
Investments in equity method subsidiaries (as of September 30, 2024)	5	17	22	594	616
Construction and acquisition expenditures	202	208	410	64	474

	Utility
Total · Alliant
Reportable · Energy
Nine Months Ended September 30, 2025	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$1,455	$1,373	$2,828	N/A	$2,828
Gas utility revenues	185	181	366	N/A	366
Other revenues	36	1	37	$67	104
Total revenues	1,676	1,555	3,231	67	3,298
Electric production fuel and purchased power expense	213	351	564	N/A	564
Electric transmission service expense	322	152	474	N/A	474
Cost of gas sold expense	89	91	180	N/A	180
Other operation and maintenance expense	275	222	497	33	530
Other segment items:
Depreciation and amortization expense	346	275	621	10	631
Interest expense	154	129	283	89	372
Equity income from unconsolidated investments, net	—	(1)	(1)	(40)	(41)
Income tax benefit	(98)	(9)	(107)	(2)	(109)
Other (a)	1	24	25	4	29
Net income (loss)	374	321	695	(27)	668
Construction and acquisition expenditures	976	511	1,487	161	1,648

	Utility
Total · Alliant
Nine Months Ended September 30, 2024 (amounts may not foot due to rounding) · Reportable · Energy
IPL · WPL · Segments · Other · Consolidated
Electric utility revenues	$1,318	$1,261	$2,579	N/A	$2,579
Gas utility revenues	175	147	322	N/A	322
Other revenues	34	2	36	$68	104
Total revenues	1,527	1,410	2,937	68	3,005
Electric production fuel and purchased power expense	195	298	493	N/A	493
Electric transmission service expense	317	148	465	N/A	464
Cost of gas sold expense	85	67	152	N/A	152
Asset valuation charge for IPL’s Lansing Generating Station	60	—	60	N/A	60
Other operation and maintenance expense	281	200	481	29	510
Other segment items:
Depreciation and amortization expense	294	269	563	8	571
Interest expense	128	124	252	77	329
Equity income from unconsolidated investments, net	—	(2)	(2)	(42)	(44)
Income tax expense (benefit)	(112)	13	(99)	(5)	(104)
Other (a)	7	23	30	3	34
Net income (loss)	272	270	542	(2)	540
Construction and acquisition expenditures	702	578	1,280	154	1,434

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

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