Revenues Revenues (Tables)

12 Months Ended

Dec. 31, 2021

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, 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

	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