Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Money Pool

Money pool borrowings:

(Millions of Dollars, Except Interest Rates)	Three Months Ended Dec. 31, 2022			Year Ended
				2022			2021
Borrowing limit	$	150		$	150		$	150
Amount outstanding at period end	—			—			—
Average amount outstanding	1			25			16
Maximum amount outstanding	16			81			78
Weighted average interest rate, computed on a daily basis	4.07		%	1.10		%	0.05		%
Weighted average interest rate at period end	N/A			N/A			N/A

Commercial Paper

Commercial paper outstanding:

(Millions of Dollars, Except Interest Rates)	Three Months Ended Dec. 31, 2022		Year Ended Dec. 31
			2022		2021		2020
Borrowing limit	$	150	$	150	$	150	$	150
Amount outstanding at period end	47		47		83		19
Average amount outstanding	9		18		3		30
Maximum amount outstanding	52		123		83		95
Weighted average interest rate, computed on a daily basis	4.39		1.03		0.18		1.59
Weighted average interest rate at end of period	4.55		4.55		0.21		0.17

Schedule of Debt To Total Capitalization Ratio

Debt-to-Total Capitalization Ratio (a)				Amount Facility May Be Increased (millions of dollars)	Additional Periods for Which a One-Year Extension May Be Requested (b)
2022		2021
47	%	49	%	N/A	1

(a)    The credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.

(b)    All extension requests are subject to majority bank group approval.

Credit Facilities

(in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	150	$	47	$	103

(a)This credit facility matures in September 2027.

(b)Includes outstanding commercial paper.

^[1],[2]

Schedule of Long-Term Debt

Long-term debt obligations for NSP-Wisconsin as of Dec. 31 (in millions of dollars):

Financing Instrument	Interest Rate	Maturity Date	2022		2021
First mortgage bonds	3.30	June 15, 2024	100		100
First mortgage bonds	3.30	June 15, 2024	100		100
First mortgage bonds	6.375	Sept. 1, 2038	200		200
First mortgage bonds	3.70	Oct. 1, 2042	100		100
First mortgage bonds	3.75	Dec. 1, 2047	100		100
First mortgage bonds	4.20	Sept. 1, 2048	200		200
First mortgage bonds	3.05	May 1, 2051	100		100
First mortgage bonds (a)	2.82	May 1, 2051	100		100
First mortgage bonds (b)	4.86	Sept. 15, 2052	100		—
Other long-term debt			—		1
Unamortized discount			(3)		(4)
Unamortized debt issuance cost			(11)		(10)
Total long-term debt			$	1,086	$	987

(a)2021 financing.

(b)2022 financing.

Schedule of Maturities of Long-term Debt

Maturities of long-term debt:

(Millions of Dollars)
2023	$	—
2024	200
2025	—
2026	—
2027	—

Dividend Payment Restrictions

Equity to Total Capitalization Ratio Required Range			Equity to Total Capitalization Ratio Actual
Low		High	2022
52.5	%	N/A	52.8	%

Unrestricted Retained Earnings			Total Capitalization		Limit on Total Capitalization (a)
$	11	million	2,280	million	N/A

(a)NSP-Wisconsin cannot pay annual dividends in excess of forecasted levels if its average equity-to-total capitalization ratio falls below the commission authorized level.

[1] Includes outstanding commercial paper

[2] This credit facility matures in September 2027.