Segments Of Business (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021
Revenues	$701	$170	$13	$884	$17	$901
Operating income	147	44	2	193	5	198
Net income attributable to Alliant Energy common shareowners				163	8	171
Three Months Ended March 31, 2020
Revenues	$730	$152	$12	$894	$22	$916
Operating income (loss)	146	41	4	191	(3)	188
Net income (loss) attributable to Alliant Energy common shareowners				173	(3)	170

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$386	$91	$12	$489
Operating income	72	30	1	103
Net income available for common stock				79
Three Months Ended March 31, 2020
Revenues	$425	$83	$11	$519
Operating income	67	27	3	97
Net income available for common stock				83

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$315	$79	$1	$395
Operating income	75	14	1	90
Net income				84
Three Months Ended March 31, 2020
Revenues	$305	$69	$1	$375
Operating income	79	14	1	94
Net income				90

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, 2021
Revenues	$701	$170	$13	$884	$17	$901
Operating income	147	44	2	193	5	198
Net income attributable to Alliant Energy common shareowners				163	8	171
Three Months Ended March 31, 2020
Revenues	$730	$152	$12	$894	$22	$916
Operating income (loss)	146	41	4	191	(3)	188
Net income (loss) attributable to Alliant Energy common shareowners				173	(3)	170

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$386	$91	$12	$489
Operating income	72	30	1	103
Net income available for common stock				79
Three Months Ended March 31, 2020
Revenues	$425	$83	$11	$519
Operating income	67	27	3	97
Net income available for common stock				83

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$315	$79	$1	$395
Operating income	75	14	1	90
Net income				84
Three Months Ended March 31, 2020
Revenues	$305	$69	$1	$375
Operating income	79	14	1	94
Net income				90

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, 2021
Revenues	$701	$170	$13	$884	$17	$901
Operating income	147	44	2	193	5	198
Net income attributable to Alliant Energy common shareowners				163	8	171
Three Months Ended March 31, 2020
Revenues	$730	$152	$12	$894	$22	$916
Operating income (loss)	146	41	4	191	(3)	188
Net income (loss) attributable to Alliant Energy common shareowners				173	(3)	170

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$386	$91	$12	$489
Operating income	72	30	1	103
Net income available for common stock				79
Three Months Ended March 31, 2020
Revenues	$425	$83	$11	$519
Operating income	67	27	3	97
Net income available for common stock				83

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended March 31, 2021
Revenues	$315	$79	$1	$395
Operating income	75	14	1	90
Net income				84
Three Months Ended March 31, 2020
Revenues	$305	$69	$1	$375
Operating income	79	14	1	94
Net income				90