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Segments Of Business

9 Months Ended

Sep. 30, 2024

Segment Reporting Information [Line Items]

SEGMENTS OF BUSINESS

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations. Refer to Note 2 for discussion of asset valuation charges recorded in the second quarter of 2024 related to IPL’s Lansing Generating Station, which decreased the assets for “Utility - Electric,” and N ote 11 for discussion of additional AROs recorded in the second quarter of 2024 substantially due to the enactment of the revised CCR Rule, which primarily increased the assets for “Utility - Electric.”


Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended September 30, 2024
Revenues	$999	$49	$12	$1,060	$21	$1,081
Operating income (loss)	305	(4)	4	305	8	313
Net income (loss) attributable to Alliant Energy common shareowners				304	(9)	295
Three Months Ended September 30, 2023
Revenues	$995	$47	$13	$1,055	$22	$1,077
Operating income (loss)	319	(4)	—	315	7	322
Net income (loss) attributable to Alliant Energy common shareowners				277	(18)	259



Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Nine Months Ended September 30, 2024
Revenues	$2,579	$322	$36	$2,937	$68	$3,005
Operating income (loss)	600	44	(7)	637	28	665
Net income (loss) attributable to Alliant Energy common shareowners				542	(2)	540
Nine Months Ended September 30, 2023
Revenues	$2,562	$400	$38	$3,000	$66	$3,066
Operating income	682	48	12	742	18	760
Net income (loss) attributable to Alliant Energy common shareowners				598	(16)	582


IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$523	$27	$11	$561
Operating income (loss)	148	(3)	4	149
Net income				190
Three Months Ended September 30, 2023
Revenues	$551	$31	$12	$594
Operating income (loss)	171	(2)	4	173
Net income				170
Nine Months Ended September 30, 2024
Revenues	$1,318	$175	$34	$1,527
Operating income (loss)	239	18	(7)	250
Net income				272
Nine Months Ended September 30, 2023
Revenues	$1,370	$224	$36	$1,630
Operating income	342	25	12	379
Net income				331


WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$476	$22	$1	$499
Operating income (loss)	157	(1)	—	156
Net income				114
Three Months Ended September 30, 2023
Revenues	$444	$16	$1	$461
Operating income (loss)	148	(2)	(4)	142
Net income				107
Nine Months Ended September 30, 2024
Revenues	$1,261	$147	$2	$1,410
Operating income	361	26	—	387
Net income				270
Nine Months Ended September 30, 2023
Revenues	$1,192	$176	$2	$1,370
Operating income	340	23	—	363
Net income				267

IPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS


Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended September 30, 2024
Revenues	$999	$49	$12	$1,060	$21	$1,081
Operating income (loss)	305	(4)	4	305	8	313
Net income (loss) attributable to Alliant Energy common shareowners				304	(9)	295
Three Months Ended September 30, 2023
Revenues	$995	$47	$13	$1,055	$22	$1,077
Operating income (loss)	319	(4)	—	315	7	322
Net income (loss) attributable to Alliant Energy common shareowners				277	(18)	259



Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Nine Months Ended September 30, 2024
Revenues	$2,579	$322	$36	$2,937	$68	$3,005
Operating income (loss)	600	44	(7)	637	28	665
Net income (loss) attributable to Alliant Energy common shareowners				542	(2)	540
Nine Months Ended September 30, 2023
Revenues	$2,562	$400	$38	$3,000	$66	$3,066
Operating income	682	48	12	742	18	760
Net income (loss) attributable to Alliant Energy common shareowners				598	(16)	582


IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$523	$27	$11	$561
Operating income (loss)	148	(3)	4	149
Net income				190
Three Months Ended September 30, 2023
Revenues	$551	$31	$12	$594
Operating income (loss)	171	(2)	4	173
Net income				170
Nine Months Ended September 30, 2024
Revenues	$1,318	$175	$34	$1,527
Operating income (loss)	239	18	(7)	250
Net income				272
Nine Months Ended September 30, 2023
Revenues	$1,370	$224	$36	$1,630
Operating income	342	25	12	379
Net income				331


WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$476	$22	$1	$499
Operating income (loss)	157	(1)	—	156
Net income				114
Three Months Ended September 30, 2023
Revenues	$444	$16	$1	$461
Operating income (loss)	148	(2)	(4)	142
Net income				107
Nine Months Ended September 30, 2024
Revenues	$1,261	$147	$2	$1,410
Operating income	361	26	—	387
Net income				270
Nine Months Ended September 30, 2023
Revenues	$1,192	$176	$2	$1,370
Operating income	340	23	—	363
Net income				267

WPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS


Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended September 30, 2024
Revenues	$999	$49	$12	$1,060	$21	$1,081
Operating income (loss)	305	(4)	4	305	8	313
Net income (loss) attributable to Alliant Energy common shareowners				304	(9)	295
Three Months Ended September 30, 2023
Revenues	$995	$47	$13	$1,055	$22	$1,077
Operating income (loss)	319	(4)	—	315	7	322
Net income (loss) attributable to Alliant Energy common shareowners				277	(18)	259



Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Nine Months Ended September 30, 2024
Revenues	$2,579	$322	$36	$2,937	$68	$3,005
Operating income (loss)	600	44	(7)	637	28	665
Net income (loss) attributable to Alliant Energy common shareowners				542	(2)	540
Nine Months Ended September 30, 2023
Revenues	$2,562	$400	$38	$3,000	$66	$3,066
Operating income	682	48	12	742	18	760
Net income (loss) attributable to Alliant Energy common shareowners				598	(16)	582


IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$523	$27	$11	$561
Operating income (loss)	148	(3)	4	149
Net income				190
Three Months Ended September 30, 2023
Revenues	$551	$31	$12	$594
Operating income (loss)	171	(2)	4	173
Net income				170
Nine Months Ended September 30, 2024
Revenues	$1,318	$175	$34	$1,527
Operating income (loss)	239	18	(7)	250
Net income				272
Nine Months Ended September 30, 2023
Revenues	$1,370	$224	$36	$1,630
Operating income	342	25	12	379
Net income				331


WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended September 30, 2024
Revenues	$476	$22	$1	$499
Operating income (loss)	157	(1)	—	156
Net income				114
Three Months Ended September 30, 2023
Revenues	$444	$16	$1	$461
Operating income (loss)	148	(2)	(4)	142
Net income				107
Nine Months Ended September 30, 2024
Revenues	$1,261	$147	$2	$1,410
Operating income	361	26	—	387
Net income				270
Nine Months Ended September 30, 2023
Revenues	$1,192	$176	$2	$1,370
Operating income	340	23	—	363
Net income				267

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details