Borrowings and Other Financing Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of March 31, 2024, NSP-Wisconsin had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Outstanding (b)		Available
$	150	$	—	$	150

(a)Expires in September 2027.

(b)Includes outstanding commercial paper.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings:

(Amounts in Millions, Except Interest Rates)	Three Months Ended March 31, 2024			Year Ended Dec. 31, 2023
Borrowing limit	$	150		$	150
Amount outstanding at period end	19			—
Average amount outstanding	12			6
Maximum amount outstanding	54			43
Weighted average interest rate, computed on a daily basis	5.33		%	4.98		%
Weighted average interest rate at period end	5.33			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding:

(Amounts in Millions, Except Interest Rates)	Three Months Ended March 31, 2024			Year Ended Dec. 31, 2023
Borrowing limit	$	150		$	150
Amount outstanding at period end	—			60
Average amount outstanding	41			15
Maximum amount outstanding	99			93
Weighted average interest rate, computed on a daily basis	5.49		%	4.85		%
Weighted average interest rate at period end	N/A			5.50