Revenues Revenues (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

NSP-Wisconsin’s operating revenues consisted of the following:

	Year Ended Dec. 31, 2023
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	299	$	84	$	—	$	383
C&I	494		65		—		559
Other	7		—		1		8
Total retail	800		149		1		950
Interchange	204		—		—		204
Other	3		5		—		8
Total revenue from contracts with customers	1,007		154		1		1,162
Alternative revenue and other	12		3		—		15
Total revenues	$	1,019	$	157	$	1	$	1,177

	Year Ended Dec. 31, 2022
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	293	$	103	$	—	$	396
C&I	485		87		—		572
Other	7		—		—		7
Total retail	785		190		—		975
Interchange	202		—		—		202
Other	4		4		—		8
Total revenue from contracts with customers	991		194		—		1,185
Alternative revenue and other	11		4		1		16
Total revenues	$	1,002	$	198	$	1	$	1,201

	Year Ended Dec. 31, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	272	$	91	$	—	$	363
C&I	441		85		—		526
Other	8		—		1		9
Total retail	721		176		1		898
Interchange	189		—		—		189
Other	—		4		—		4
Total revenue from contracts with customers	910		180		1		1,091
Alternative revenue and other	12		2		—		14
Total revenues	$	922	$	182	$	1	$	1,105