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Borrowings and Other Financing Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Money Pool [Table Text Block]
Money pool borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2021Year Ended Dec. 31
202120202019
Borrowing limit$250 $250 $250 $250 
Amount outstanding at period end— — — — 
Average amount outstanding— 6 3 32 
Maximum amount outstanding— 236 116 250 
Weighted average interest rate, computed on a daily basisN/A0.07 %1.53 %2.05 %
Weighted average interest rate at period endN/AN/AN/AN/A
Short Term Debt Commercial paper outstanding:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2021Year Ended Dec. 31
202120202019
Borrowing limit$500 $500 $500 $500 
Amount outstanding at period end— — 179 30 
Average amount outstanding— 26 10 71 
Maximum amount outstanding13 317 179 317 
Weighted average interest rate, computed on a daily basis0.15 %0.18 %1.25 %2.59 %
Weighted average interest rate at end of periodN/AN/A0.18 2.05 
Schedule of Debt To Total Capitalization Ratio
Features of NSP-Minnesota’s credit facility:
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)
20212020
47 %47 %$100 2 
(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 		[1],[2]
Credit Facilities
NSP-Minnesota had the following committed credit facility available as of Dec. 31, 2021 (in millions of dollars):
Credit Facility (a)
Drawn (b)
Available
$500 $9 $491 
(a)This credit facility matures in June 2024.
(b)Includes outstanding commercial paper and letters of credit.
 [3]
Schedule of Long-Term Debt
Long term debt obligations for NSP-Minnesota as of Dec. 31 (in millions of dollars):
Financing InstrumentInterest RateMaturity Date20212020
First mortgage bonds2.15 %Aug. 15, 2022$300 $300 
First mortgage bonds2.60 May 15, 2023400 400 
First mortgage bonds7.125 July 1, 2025250 250 
First mortgage bonds6.50 March 1, 2028150 150 
First mortgage bonds (a)
2.25 April 1, 2031425 — 
First mortgage bonds5.25 July 15, 2035250 250 
First mortgage bonds6.25 June 1, 2036400 400 
First mortgage bonds6.20 July 1, 2037350 350 
First mortgage bonds5.35 Nov. 1, 2039300 300 
First mortgage bonds4.85 Aug. 15, 2040250 250 
First mortgage bonds3.40 Aug. 15, 2042500 500 
First mortgage bonds4.125 May 15, 2044300 300 
First mortgage bonds4.00 Aug. 15, 2045300 300 
First mortgage bonds3.60 May 15, 2046350 350 
First mortgage bonds3.60 Sept. 15, 2047600 600 
First mortgage bonds2.90 March 1, 2050600 600 
First mortgage bonds (b)
2.60 June 1, 2051700 700 
First mortgage bonds (a)
3.20 April 1, 2052425 — 
Other long-term debt3 — 
Unamortized discount(44)(42)
Unamortized debt issuance cost(62)(54)
Current maturities(300)— 
Total long-term debt$6,447 $5,904 
(a)2021 financing.
(b)2020 financing. 		[4],[5]
Schedule of Maturities of Long-term Debt
Maturities of long-term debt are as follows:
(Millions of Dollars)
2022$300 
2023400 
2024— 
2025250 
2026— 
Dividend Payment Restrictions
Requirements and actuals as of Dec. 31, 2021:
Equity to Total
Capitalization Ratio
Required Range 		Equity to Total Capitalization Ratio Actual
LowHigh2021
47.2 %57.6 %52.9 %
Unrestricted Retained EarningsTotal CapitalizationLimit on Total Capitalization
$1,558  million$14,321  million$15,332  million
[1] (b)    All extension requests are subject to majority bank group approval.
[2] The credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
[3] Includes outstanding commercial paper and letters of credit.
[4] 2020 financing.
[5] 2021 financing.