Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

NSP-Wisconsin's segment information:

	Three Months Ended March 31
(Millions of Dollars)	2023		2022
Regulated Electric
Total revenues (a)	$	254	$	250
Net income	33		32
Regulated Natural Gas
Total revenues	$	77	$	78
Net income	11		15
All Other
Net income	$	1	$	—
Consolidated Total
Total revenues (a)	$	331	$	328
Net income	45		47

(a)Total revenues include $50 million and $47 million of affiliate electric revenue for the three months ended March 31, 2023 and 2022, respectively.