Revenues (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	73	$	8	$	81
C&I	126		12		138
Other	2		—		2
Total retail	201		20		221
Interchange	48		—		48
Other	—		2		2
Total revenue from contracts with customers	249		22		271
Alternative revenue and other	3		—		3
Total revenues	$	252	$	22	$	274

	Three Months Ended Sept. 30, 2020
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	71	$	7	$	78
C&I	119		6		125
Other	1		—		1
Total retail	191		13		204
Interchange	41		—		41
Other	1		1		2
Total revenue from contracts with customers	233		14		247
Alternative revenue and other	3		1		4
Total revenues	$	236	$	15	$	251

	Nine Months Ended Sept. 30, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	208	$	54	$	262
C&I	336		51		387
Other	7		—		7
Total retail	551		105		656
Interchange	140		—		140
Other	—		4		4
Total revenue from contracts with customers	691		109		800
Alternative revenue and other	9		1		10
Total revenues	$	700	$	110	$	810

	Nine Months Ended Sept. 30, 2020
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	195	$	43	$	238
C&I	313		32		345
Other	5		—		5
Total retail	513		75		588
Interchange	123		—		123
Other	1		3		4
Total revenue from contracts with customers	637		78		715
Alternative revenue and other	10		1		11
Total revenues	$	647	$	79	$	726