Revenues

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. NSP-Wisconsin’s operating revenues consisted of the following:

	Year Ended Dec. 31, 2020
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	258	$	64	$	322
C&I	411		49		460
Other	6		—		6
Total retail	675		113		788
Interchange	168		—		168
Other	—		4		4
Total revenue from contracts with customers	843		117		960
Alternative revenue and other	12		2		14
Total revenues	$	855	$	119	$	974

	Year Ended Dec. 31, 2019
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	240	$	73	$	313
C&I	409		57		466
Other	6		—		6
Total retail	655		130		785
Interchange	177		—		177
Other	1		4		5
Total revenue from contracts with customers	833		134		967
Alternative revenue and other	12		2		14
Total revenues	$	845	$	136	$	981

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	255	$	73	$	—	$	328
C&I	444		62		—		506
Other	6		—		1		7
Total retail	705		135		1		841
Interchange	158		—		—		158
Other	4		5		—		9
Total revenue from contracts with customers	867		140		1		1,008
Alternative revenue and other	12		2		—		14
Total revenues	$	879	$	142	$	1	$	1,022