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Borrowings and Other Financing Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Money Pool [Table Text Block]
Money pool borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2022Year Ended Dec. 31
202220212020
Borrowing limit$100 $100 $100 $100 
Amount outstanding at period end— — 91 — 
Average amount outstanding7 35 51 43 
Maximum amount outstanding42 100 100 100 
Weighted average interest rate, computed on a daily basis3.17 %0.44 %0.05 %0.54 %
Weighted average interest rate at end of periodN/AN/A0.05 N/A
Short-Term Borrowings Commercial paper outstanding:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2022Year Ended Dec. 31
202220212020
Borrowing limit$500 $500 $500 $500 
Amount outstanding at period end34 34 137 250 
Average amount outstanding20 100 63 44 
Maximum amount outstanding65 324 342 250 
Weighted average interest rate, computed on a daily basis4.08 %0.79 %0.21 %1.11 %
Weighted average interest rate at end of period4.55 4.55 0.26 0.29 
Schedule Of Debt To Total Capitalization Ratio [Table Text Block]
Features of SPS’ 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)
20222021
46%47%$502
(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
SPS had the following committed credit facility available as of Dec. 31, 2022 (in millions) of dollars:
Credit Facility (a)
Drawn (b)
Available
$500 $36 $464 
(a)This credit facility matures in September 2027.
(b)Includes letters of credit and outstanding commercial paper.
 [3],[4]
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt obligations for SPS as of Dec. 31 (in millions of dollars):
Financing InstrumentInterest RateMaturity Date20222021
First mortgage bonds3.30 %June 15, 2024$150 $150 
First mortgage bonds3.30 June 15, 2024200 200 
Unsecured senior notes6.00 Oct. 1, 2033100 100 
Unsecured senior notes6.00 Oct. 1, 2036250 250 
First mortgage bonds4.50 Aug. 15, 2041200 200 
First mortgage bonds4.50 Aug. 15, 2041100 100 
First mortgage bonds4.50 Aug. 15, 2041100 100 
First mortgage bonds3.40 Aug. 15, 2046300 300 
First mortgage bonds3.70 Aug. 15, 2047450 450 
First mortgage bonds4.40 Nov. 15, 2048300 300 
First mortgage bonds
3.75 June 15, 2049300 300 
First mortgage bonds 3.15 May 1, 2050350 350 
First mortgage bonds (a)
3.15 May 1, 2050250 250 
First mortgage bonds (b)
5.15 June 1, 2052200 — 
Unamortized discount(10)(9)
Unamortized debt issuance cost(29)(28)
Total long-term debt$3,211 $3,013 
(a)2020 financing re-opened in 2021.
(b)2022 financing.
 [5]
Schedule of Maturities of Long-term Debt [Table Text Block]
Maturities of long-term debt:
(Millions of Dollars)
2023$— 
2024350 
2025— 
2026— 
2027— 
Schedule of Stock by Class [Table Text Block] SPS has the following preferred stock:
Preferred Stock Authorized (Shares)Par Value of Preferred StockPreferred Stock Outstanding (Shares) 2022 and 2021
10,000,000 1.00 — 
Dividend Payment Restrictions [Text Block]
Requirements and actuals as of Dec. 31, 2022:
Equity to Total Capitalization Ratio
Required Range
Equity to Total Capitalization Ratio Actual (a)
LowHigh2022
45.0 %55.0 %54.3 %
(a)Excludes short-term debt.
Unrestricted Retained EarningsTotal Capitalization
Limit on Total Capitalization (a)
$540  million$7,094 millionN/A
(a)SPS may not pay a dividend that would cause it to lose its investment grade bond rating.
[1] 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 letters of credit and outstanding commercial paper.
[4] This credit facility matures in September 2027.
[5] 2022 financing