Segments Of Business (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2021
Revenues	$717	$69	$10	$796	$21	$817
Operating income (loss)	164	3	(1)	166	10	176
Net income attributable to Alliant Energy common shareowners				124	20	144
Three Months Ended June 30, 2020
Revenues	$675	$59	$10	$744	$19	$763
Operating income	152	7	1	160	8	168
Net income attributable to Alliant Energy common shareowners				118	16	134

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2021
Revenues	$1,418	$239	$23	$1,680	$38	$1,718
Operating income	311	47	1	359	15	374
Net income attributable to Alliant Energy common shareowners				287	28	315
Six Months Ended June 30, 2020
Revenues	$1,405	$211	$22	$1,638	$41	$1,679
Operating income	298	49	4	351	5	356
Net income attributable to Alliant Energy common shareowners				289	15	304

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$402	$43	$10	$455
Operating income	107	3	1	111
Net income available for common stock				86
Three Months Ended June 30, 2020
Revenues	$388	$34	$10	$432
Operating income	82	5	1	88
Net income available for common stock				60
Six Months Ended June 30, 2021
Revenues	$788	$134	$22	$944
Operating income	179	33	2	214
Net income available for common stock				165
Six Months Ended June 30, 2020
Revenues	$813	$117	$21	$951
Operating income	149	33	3	185
Net income available for common stock				142

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$315	$26	$—	$341
Operating income (loss)	57	—	(2)	55
Net income				38
Three Months Ended June 30, 2020
Revenues	$287	$25	$—	$312
Operating income	70	2	—	72
Net income				58
Six Months Ended June 30, 2021
Revenues	$630	$105	$1	$736
Operating income (loss)	132	14	(1)	145
Net income				122
Six Months Ended June 30, 2020
Revenues	$592	$94	$1	$687
Operating income	149	16	1	166
Net income				147

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 June 30, 2021
Revenues	$717	$69	$10	$796	$21	$817
Operating income (loss)	164	3	(1)	166	10	176
Net income attributable to Alliant Energy common shareowners				124	20	144
Three Months Ended June 30, 2020
Revenues	$675	$59	$10	$744	$19	$763
Operating income	152	7	1	160	8	168
Net income attributable to Alliant Energy common shareowners				118	16	134

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2021
Revenues	$1,418	$239	$23	$1,680	$38	$1,718
Operating income	311	47	1	359	15	374
Net income attributable to Alliant Energy common shareowners				287	28	315
Six Months Ended June 30, 2020
Revenues	$1,405	$211	$22	$1,638	$41	$1,679
Operating income	298	49	4	351	5	356
Net income attributable to Alliant Energy common shareowners				289	15	304

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$402	$43	$10	$455
Operating income	107	3	1	111
Net income available for common stock				86
Three Months Ended June 30, 2020
Revenues	$388	$34	$10	$432
Operating income	82	5	1	88
Net income available for common stock				60
Six Months Ended June 30, 2021
Revenues	$788	$134	$22	$944
Operating income	179	33	2	214
Net income available for common stock				165
Six Months Ended June 30, 2020
Revenues	$813	$117	$21	$951
Operating income	149	33	3	185
Net income available for common stock				142

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$315	$26	$—	$341
Operating income (loss)	57	—	(2)	55
Net income				38
Three Months Ended June 30, 2020
Revenues	$287	$25	$—	$312
Operating income	70	2	—	72
Net income				58
Six Months Ended June 30, 2021
Revenues	$630	$105	$1	$736
Operating income (loss)	132	14	(1)	145
Net income				122
Six Months Ended June 30, 2020
Revenues	$592	$94	$1	$687
Operating income	149	16	1	166
Net income				147

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 June 30, 2021
Revenues	$717	$69	$10	$796	$21	$817
Operating income (loss)	164	3	(1)	166	10	176
Net income attributable to Alliant Energy common shareowners				124	20	144
Three Months Ended June 30, 2020
Revenues	$675	$59	$10	$744	$19	$763
Operating income	152	7	1	160	8	168
Net income attributable to Alliant Energy common shareowners				118	16	134

Alliant Energy					ATC Holdings,	Alliant
	Utility				Non-Utility,	Energy
	Electric	Gas	Other	Total	Parent and Other	Consolidated
	(in millions)
Six Months Ended June 30, 2021
Revenues	$1,418	$239	$23	$1,680	$38	$1,718
Operating income	311	47	1	359	15	374
Net income attributable to Alliant Energy common shareowners				287	28	315
Six Months Ended June 30, 2020
Revenues	$1,405	$211	$22	$1,638	$41	$1,679
Operating income	298	49	4	351	5	356
Net income attributable to Alliant Energy common shareowners				289	15	304

IPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$402	$43	$10	$455
Operating income	107	3	1	111
Net income available for common stock				86
Three Months Ended June 30, 2020
Revenues	$388	$34	$10	$432
Operating income	82	5	1	88
Net income available for common stock				60
Six Months Ended June 30, 2021
Revenues	$788	$134	$22	$944
Operating income	179	33	2	214
Net income available for common stock				165
Six Months Ended June 30, 2020
Revenues	$813	$117	$21	$951
Operating income	149	33	3	185
Net income available for common stock				142

WPL	Electric	Gas	Other	Total
	(in millions)
Three Months Ended June 30, 2021
Revenues	$315	$26	$—	$341
Operating income (loss)	57	—	(2)	55
Net income				38
Three Months Ended June 30, 2020
Revenues	$287	$25	$—	$312
Operating income	70	2	—	72
Net income				58
Six Months Ended June 30, 2021
Revenues	$630	$105	$1	$736
Operating income (loss)	132	14	(1)	145
Net income				122
Six Months Ended June 30, 2020
Revenues	$592	$94	$1	$687
Operating income	149	16	1	166
Net income				147