Segments and Related Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

NSP-Wisconsin’s segment information:

(Millions of Dollars)	2023		2022		2021
Regulated Electric
Total revenues (a)	$	1,019	$	1,002	$	922
Depreciation and amortization	142		131		120
Interest charges and financing costs	45		38		36
Income tax expense	38		29		27
Net income	126		105		98
Regulated Natural Gas
Operating revenues — external	$	157	$	198	$	182
Intersegment revenue	1		—		1
Total revenues	$	158	$	198	$	183
Depreciation and amortization	28		27		27
Interest charges and financing costs	5		4		4
Income tax expense	2		6		2
Net income	9		17		7
All Other
Total revenues	$	1	$	1	$	1
Income tax expense	—		—		1
Net income	1		3		3
Consolidated Total
Total revenues (a)	$	1,178	$	1,201	$	1,106
Reconciling eliminations	(1)		—		(1)
Total operating revenues	$	1,177	$	1,201	$	1,105
Depreciation and amortization	170		158		147
Interest charges and financing costs	50		42		40
Income tax expense	40		35		30
Net income	136		125		108

(a)Operating revenues include $204 million, $202 million and $189 million of affiliate electric revenue for the years ended Dec. 31, 2023, 2022 and 2021, respectively. See Note 12 for further information.