Revenues (Tables)

3 Months Ended

Mar. 31, 2025

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended March 31, 2025
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	81	$	38	$	119
C&I	114		28		142
Other	2		—		2
Total retail	197		66		263
Interchange and other	59		1		60
Total revenue from contracts with customers	256		67		323
Alternative revenue and other	3		1		4
Total revenues	$	259	$	68	$	327

	Three Months Ended March 31, 2024
(Millions of Dollars)	Electric		Natural Gas		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	77	$	30	$	107
C&I	118		22		140
Other	2		—		2
Total retail	197		52		249
Interchange and other	56		1		57
Total revenue from contracts with customers	253		53		306
Alternative revenue and other	3		1		4
Total revenues	$	256	$	54	$	310