Segments Of Business

3 Months Ended

Mar. 31, 2023

Segment Reporting Information [Line Items]

Segments Of Business

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, 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
Three Months Ended March 31, 2022
Revenues	$773	$262	$11	$1,046	$22	$1,068
Operating income	181	57	3	241	7	248
Net income attributable to Alliant Energy common shareowners				179	13	192

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72
Three Months Ended March 31, 2022
Revenues	$400	$139	$11	$550
Operating income	75	32	3	110
Net income				87

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88
Three Months Ended March 31, 2022
Revenues	$373	$123	$—	$496
Operating income	106	25	—	131
Net income				92

IPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

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, 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
Three Months Ended March 31, 2022
Revenues	$773	$262	$11	$1,046	$22	$1,068
Operating income	181	57	3	241	7	248
Net income attributable to Alliant Energy common shareowners				179	13	192

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72
Three Months Ended March 31, 2022
Revenues	$400	$139	$11	$550
Operating income	75	32	3	110
Net income				87

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88
Three Months Ended March 31, 2022
Revenues	$373	$123	$—	$496
Operating income	106	25	—	131
Net income				92

WPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

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, 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
Three Months Ended March 31, 2022
Revenues	$773	$262	$11	$1,046	$22	$1,068
Operating income	181	57	3	241	7	248
Net income attributable to Alliant Energy common shareowners				179	13	192

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$388	$150	$11	$549
Operating income	66	27	3	96
Net income				72
Three Months Ended March 31, 2022
Revenues	$400	$139	$11	$550
Operating income	75	32	3	110
Net income				87

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2023
Revenues	$380	$126	$—	$506
Operating income	97	23	1	121
Net income				88
Three Months Ended March 31, 2022
Revenues	$373	$123	$—	$496
Operating income	106	25	—	131
Net income				92