Segments Of Business (Tables)

6 Months Ended

Jun. 30, 2024

Segment Reporting Information [Line Items]

Schedule Of 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 Note 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 June 30, 2024
Revenues	$789	$69	$10	$868	$26	$894
Operating income (loss)	131	1	(16)	116	14	130
Net income attributable to Alliant Energy common shareowners				82	5	87
Three Months Ended June 30, 2023
Revenues	$799	$77	$13	$889	$23	$912
Operating income	200	2	7	209	8	217
Net income (loss) attributable to Alliant Energy common shareowners				161	(1)	160

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2024
Revenues	$1,580	$273	$24	$1,877	$48	$1,925
Operating income (loss)	295	48	(11)	332	20	352
Net income attributable to Alliant Energy common shareowners				237	8	245
Six Months Ended June 30, 2023
Revenues	$1,567	$353	$25	$1,945	$45	$1,990
Operating income	363	52	11	426	13	439
Net income attributable to Alliant Energy common shareowners				321	2	323

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$404	$40	$9	$453
Operating income (loss)	34	(1)	(17)	16
Net income				18
Three Months Ended June 30, 2023
Revenues	$431	$44	$12	$487
Operating income	105	—	5	110
Net income				89
Six Months Ended June 30, 2024
Revenues	$795	$148	$23	$966
Operating income (loss)	91	21	(11)	101
Net income				81
Six Months Ended June 30, 2023
Revenues	$819	$194	$24	$1,037
Operating income	171	27	8	206
Net income				161

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$385	$29	$1	$415
Operating income	97	2	1	100
Net income				64
Three Months Ended June 30, 2023
Revenues	$368	$33	$1	$402
Operating income	95	2	2	99
Net income				72
Six Months Ended June 30, 2024
Revenues	$785	$125	$1	$911
Operating income	204	27	—	231
Net income				156
Six Months Ended June 30, 2023
Revenues	$748	$159	$1	$908
Operating income	192	25	3	220
Net income				160

IPL [Member]

Segment Reporting Information [Line Items]

Schedule Of 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 Note 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 June 30, 2024
Revenues	$789	$69	$10	$868	$26	$894
Operating income (loss)	131	1	(16)	116	14	130
Net income attributable to Alliant Energy common shareowners				82	5	87
Three Months Ended June 30, 2023
Revenues	$799	$77	$13	$889	$23	$912
Operating income	200	2	7	209	8	217
Net income (loss) attributable to Alliant Energy common shareowners				161	(1)	160

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2024
Revenues	$1,580	$273	$24	$1,877	$48	$1,925
Operating income (loss)	295	48	(11)	332	20	352
Net income attributable to Alliant Energy common shareowners				237	8	245
Six Months Ended June 30, 2023
Revenues	$1,567	$353	$25	$1,945	$45	$1,990
Operating income	363	52	11	426	13	439
Net income attributable to Alliant Energy common shareowners				321	2	323

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$404	$40	$9	$453
Operating income (loss)	34	(1)	(17)	16
Net income				18
Three Months Ended June 30, 2023
Revenues	$431	$44	$12	$487
Operating income	105	—	5	110
Net income				89
Six Months Ended June 30, 2024
Revenues	$795	$148	$23	$966
Operating income (loss)	91	21	(11)	101
Net income				81
Six Months Ended June 30, 2023
Revenues	$819	$194	$24	$1,037
Operating income	171	27	8	206
Net income				161

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$385	$29	$1	$415
Operating income	97	2	1	100
Net income				64
Three Months Ended June 30, 2023
Revenues	$368	$33	$1	$402
Operating income	95	2	2	99
Net income				72
Six Months Ended June 30, 2024
Revenues	$785	$125	$1	$911
Operating income	204	27	—	231
Net income				156
Six Months Ended June 30, 2023
Revenues	$748	$159	$1	$908
Operating income	192	25	3	220
Net income				160

WPL [Member]

Segment Reporting Information [Line Items]

Schedule Of 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 Note 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 June 30, 2024
Revenues	$789	$69	$10	$868	$26	$894
Operating income (loss)	131	1	(16)	116	14	130
Net income attributable to Alliant Energy common shareowners				82	5	87
Three Months Ended June 30, 2023
Revenues	$799	$77	$13	$889	$23	$912
Operating income	200	2	7	209	8	217
Net income (loss) attributable to Alliant Energy common shareowners				161	(1)	160

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2024
Revenues	$1,580	$273	$24	$1,877	$48	$1,925
Operating income (loss)	295	48	(11)	332	20	352
Net income attributable to Alliant Energy common shareowners				237	8	245
Six Months Ended June 30, 2023
Revenues	$1,567	$353	$25	$1,945	$45	$1,990
Operating income	363	52	11	426	13	439
Net income attributable to Alliant Energy common shareowners				321	2	323

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$404	$40	$9	$453
Operating income (loss)	34	(1)	(17)	16
Net income				18
Three Months Ended June 30, 2023
Revenues	$431	$44	$12	$487
Operating income	105	—	5	110
Net income				89
Six Months Ended June 30, 2024
Revenues	$795	$148	$23	$966
Operating income (loss)	91	21	(11)	101
Net income				81
Six Months Ended June 30, 2023
Revenues	$819	$194	$24	$1,037
Operating income	171	27	8	206
Net income				161

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2024
Revenues	$385	$29	$1	$415
Operating income	97	2	1	100
Net income				64
Three Months Ended June 30, 2023
Revenues	$368	$33	$1	$402
Operating income	95	2	2	99
Net income				72
Six Months Ended June 30, 2024
Revenues	$785	$125	$1	$911
Operating income	204	27	—	231
Net income				156
Six Months Ended June 30, 2023
Revenues	$748	$159	$1	$908
Operating income	192	25	3	220
Net income				160