Revenues (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended March 31, 2021
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	71	$	31	$	102
C&I	102		24		126
Other	2		—		2
Total retail	175		55		230
Interchange	46		—		46
Other	—		1		1
Total revenue from contracts with customers	221		56		277
Alternative revenue and other	3		1		4
Total revenues	$	224	$	57	$	281

	Three Months Ended March 31, 2020
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	65	$	25	$	90
C&I	100		19		119
Other	2		—		2
Total retail	167		44		211
Interchange	41		—		41
Other	—		1		1
Total revenue from contracts with customers	208		45		253
Alternative revenue and other	4		—		4
Total revenues	$	212	$	45	$	257