ALLIANT ENERGY CORP

For the period ended Sep 30, 2026. Filed Oct 30, 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.

Sep 30, 2026 · Filed Oct 30, 2026

LNT$73.24-0.3%Stored close · as of Nov 10, 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 September 30, 2026	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$631	$571	$1,202	N/A	$1,202
Gas utility revenues	32	24	56	N/A	56
Other revenues	1	—	1	$26	27
Total revenues	664	595	1,259	26	1,285
Electric production fuel and purchased power expense	89	133	222	N/A	222
Electric transmission service expense	119	57	176	N/A	176
Cost of gas sold expense	10	3	13	N/A	13
Other operation and maintenance expense	112	103	215	13	228
Other segment items:
Depreciation and amortization expense	122	98	220	3	223
Interest expense	60	49	109	36	145
Equity income from unconsolidated investments, net	—	(1)	(1)	(44)	(45)
Income tax expense (benefit)	(86)	(8)	(94)	27	(67)
Other (a)	(13)	5	(8)	—	(8)
Net income (loss)	251	156	407	(9)	398
Total assets (as of September 30, 2026)	13,411	11,123	24,534	1,420	25,954
Investments in equity method subsidiaries (as of September 30, 2026)	4	21	25	750	775
Construction and acquisition expenditures	477	310	787	(3)	784

	Utility
Total · Alliant
Three Months Ended September 30, 2025 · Reportable · Energy
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
Reportable · Energy
Nine Months Ended September 30, 2026	IPL	WPL	Segments	Other	Consolidated
Electric utility revenues	$1,499	$1,452	$2,951	N/A	$2,951
Gas utility revenues	197	211	408	N/A	408
Other revenues	4	2	6	$75	81
Total revenues	1,700	1,665	3,365	75	3,440
Electric production fuel and purchased power expense	198	324	522	N/A	522
Electric transmission service expense	320	170	490	N/A	490
Cost of gas sold expense	106	117	223	N/A	223
Other operation and maintenance expense	309	273	582	36	618
Other segment items:
Depreciation and amortization expense	360	296	656	9	665
Interest expense	174	146	320	110	430
Equity income from unconsolidated investments, net	—	(2)	(2)	(108)	(110)
Income tax benefit	(152)	(23)	(175)	(6)	(181)
Other (a)	(25)	13	(12)	3	(9)
Net income	410	351	761	31	792
Construction and acquisition expenditures	968	732	1,700	106	1,806

	Utility
Total · Alliant
Nine Months Ended September 30, 2025 · Reportable · Energy
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

(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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