Segments and Related Information (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

NSP-Wisconsin’s segment information:

(Millions of Dollars)	2021		2020		2019
Regulated Electric
Operating revenues — external (a)	$	922	$	855	$	845
Intersegment revenue	—		1		—
Total revenues	$	922	$	856	$	845
Depreciation and amortization	120		108		109
Interest charges and financing costs	36		34		34
Income tax expense	27		12		13
Net income	98		98		68
Regulated Natural Gas
Operating revenues — external	$	182	$	119	$	136
Intersegment revenue	1		—		—
Total revenues	$	183	$	119	$	136
Depreciation and amortization	27		48		29
Interest charges and financing costs	4		4		4
Income tax expense (benefit)	2		(20)		2
Net income	7		7		10
All Other
Total revenues	$	1	$	—	$	—
Income tax expense	1		1		1
Net income	3		2		1
Consolidated Total
Total revenues (a)	$	1,106	$	975	$	981
Reconciling eliminations	(1)		(1)		—
Total operating revenues	$	1,105	$	974	$	981
Depreciation and amortization	147		156		138
Interest charges and financing costs	40		38		38
Income tax expense (benefit)	30		(7)		16
Net income	108		107		79

(a)    Operating revenues include $189 million, $168 million and $177 million of affiliate electric revenue for the years ended Dec. 31, 2021, 2020 and 2019, respectively. See Note 12 for further information.