Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

NSP-Wisconsin's segment information:

	Three Months Ended March 31
(Millions of Dollars)	2024		2023
Regulated Electric
Total revenues (a)	$	256	$	254
Net income	33		33
Regulated Natural Gas
Total revenues	$	54	$	77
Net income	10		11
All Other
Net income	$	—	$	1
Consolidated Total
Total revenues (a)	$	310	$	331
Net income	43		45

(a)Total revenues include $53 million and $50 million of affiliate electric revenue for the three months ended March 31, 2024 and 2023, respectively.