Segments Of Business (Tables)

3 Months Ended

Mar. 31, 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.

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended March 31, 2024
Revenues	$791	$205	$13	$1,009	$22	$1,031
Operating income	164	47	5	216	6	222
Net income attributable to Alliant Energy common shareowners				155	3	158
Three Months Ended March 31, 2023
Revenues	$768	$276	$11	$1,055	$22	$1,077
Operating income	163	50	4	217	5	222
Net income attributable to Alliant Energy common shareowners				160	3	163

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$392	$108	$13	$513
Operating income	57	22	6	85
Net income				63
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$399	$97	$—	$496
Operating income (loss)	107	25	(1)	131
Net income				92
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88

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.

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended March 31, 2024
Revenues	$791	$205	$13	$1,009	$22	$1,031
Operating income	164	47	5	216	6	222
Net income attributable to Alliant Energy common shareowners				155	3	158
Three Months Ended March 31, 2023
Revenues	$768	$276	$11	$1,055	$22	$1,077
Operating income	163	50	4	217	5	222
Net income attributable to Alliant Energy common shareowners				160	3	163

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$392	$108	$13	$513
Operating income	57	22	6	85
Net income				63
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$399	$97	$—	$496
Operating income (loss)	107	25	(1)	131
Net income				92
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88

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.

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Three Months Ended March 31, 2024
Revenues	$791	$205	$13	$1,009	$22	$1,031
Operating income	164	47	5	216	6	222
Net income attributable to Alliant Energy common shareowners				155	3	158
Three Months Ended March 31, 2023
Revenues	$768	$276	$11	$1,055	$22	$1,077
Operating income	163	50	4	217	5	222
Net income attributable to Alliant Energy common shareowners				160	3	163

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$392	$108	$13	$513
Operating income	57	22	6	85
Net income				63
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2024
Revenues	$399	$97	$—	$496
Operating income (loss)	107	25	(1)	131
Net income				92
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88