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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Commercial Paper | Commercial paper and other borrowings outstanding:
(Millions of Dollars, Except Interest Rates) |  | Three Months Ended Dec. 31, 2023 |  | Year Ended Dec. 31
|  | 2023 |  | 2022 |  | 2021
Borrowing limit |  | $ | 3,550 |  |  | $ | 3,550 |  |  | $ | 3,550 |  |  | $ | 3,100 |
Amount outstanding at period end |  | 785 |  |  | 785 |  |  | 813 |  |  | 1,005 |
Average amount outstanding |  | 339 |  |  | 491 |  |  | 552 |  |  | 1,399 |
Maximum amount outstanding |  | 785 |  |  | 1,241 |  |  | 1,357 |  |  | 2,054 |
Weighted average interest rate, computed on a daily basis |  | 5.51 | % |  | 5.12 | % |  | 1.47 | % |  | 0.57 | %
Weighted average interest rate at period end |  | 5.52 |  |  | 5.52 |  |  | 4.66 |  |  | 0.31 |
Schedule of Debt To Total Capitalization Ratio | Features of the credit facilities:
|  | Debt-to-Total Capitalization Ratio (a) |  | Amount Facility May Be Increased (millions of dollars) (b) |  | Additional Periods for Which a One-Year Extension May Be Requested (c)
|  | 2023 |  | 2022 |  |  |  |
Xcel Energy Inc. (d) |  | 59.8 | % |  | 59.7 | % |  | $ | 350 |  |  | 2 |
NSP-Minnesota |  | 47.7 |  |  | 47.7 |  |  | 150 |  |  | 2 |
NSP-Wisconsin |  | 48.2 |  |  | 47.4 |  |  | N/A |  | 1 |
SPS |  | 46.1 |  |  | 45.7 |  |  | 50 |  |  | 2 |
PSCo |  | 44.8 |  |  | 44.0 |  |  | 100 |  |  | 2 |
(a)Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%. (b)Amounts authorized by state commissions in respective jurisdictions. (c)All extension requests are subject to majority bank group approval. (d)The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. would be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.
Credit Facilities | As of Dec. 31, 2023, NSP-Minnesota had $65 million outstanding letters of credit under the $75 million Bilateral Credit Agreement. Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2023:
(Millions of Dollars) |  | Credit Facility (a) |  | Drawn (b) |  | Available
Xcel Energy Inc. |  | $ | 1,500 |  |  | $ | 165 |  |  | $ | 1,335 |
PSCo |  | 700 |  |  | 349 |  |  | 351 |
NSP-Minnesota |  | 700 |  |  | 180 |  |  | 520 |
SPS |  | 500 |  |  | 75 |  |  | 425 |
NSP-Wisconsin |  | 150 |  |  | 60 |  |  | 90 |
Total |  | $ | 3,550 |  |  | $ | 829 |  |  | $ | 2,721 |
(a)These credit facilities mature in September 2027. (b)Includes outstanding commercial paper and letters of credit.
Schedule of Long Term Debt Instruments | Long-term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31 (in millions of dollars):
Xcel Energy Inc.
Financing Instrument |  | Interest Rate |  | Maturity Date |  | 2023 |  | 2022
Unsecured senior notes |  | 0.50 | % |  | Oct. 15, 2023 |  | $ | — |  |  | $ | 500 |
Unsecured senior notes |  | 3.30 |  |  | June 1, 2025 |  | 250 |  |  | 250 |
Unsecured senior notes |  | 3.30 |  |  | June 1, 2025 |  | 350 |  |  | 350 |
Unsecured senior notes |  | 3.35 |  |  | Dec. 1, 2026 |  | 500 |  |  | 500 |
Unsecured senior notes |  | 1.75 |  |  | March 15, 2027 |  | 500 |  |  | 500 |
Unsecured senior notes |  | 4.00 |  |  | June 15, 2028 |  | 130 |  |  | 130 |
Unsecured senior notes |  | 4.00 |  |  | June 15, 2028 |  | 500 |  |  | 500 |
Unsecured senior notes |  | 2.60 |  |  | Dec. 1, 2029 |  | 500 |  |  | 500 |
Unsecured senior notes |  | 3.40 |  |  | June 1, 2030 |  | 600 |  |  | 600 |
Unsecured senior notes |  | 2.35 |  |  | Nov. 15, 2031 |  | 300 |  |  | 300 |
Unsecured senior notes (a) |  | 4.60 |  |  | June 1, 2032 |  | 700 |  |  | 700 |
Unsecured senior notes (b) |  | 5.45 |  |  | Aug. 15, 2033 |  | 800 |  |  | — |
Unsecured senior notes |  | 6.50 |  |  | July 1, 2036 |  | 300 |  |  | 300 |
Unsecured senior notes |  | 4.80 |  |  | Sept. 15, 2041 |  | 250 |  |  | 250 |
Unsecured senior notes |  | 3.50 |  |  | Dec. 1, 2049 |  | 500 |  |  | 500 |
Unamortized discount |  |  |  |  |  | (8) |  |  | (7) |
Unamortized debt issuance cost |  |  |  |  |  | (36) |  |  | (35) |
Current maturities |  |  |  |  |  | — |  |  | (500) |
Total long-term debt |  |  |  |  |  | $ | 6,136 |  |  | $ | 5,338 |
(a)2022 financing. (b)2023 financing.
NSP-Minnesota
Financing Instrument |  | Interest Rate |  | Maturity Date |  | 2023 |  | 2022
First mortgage bonds |  | 2.60 | % |  | May 15, 2023 |  | $ | — |  |  | $ | 400 |
First mortgage bonds |  | 7.125 |  |  | July 1, 2025 |  | 250 |  |  | 250 |
First mortgage bonds |  | 6.50 |  |  | March 1, 2028 |  | 150 |  |  | 150 |
First mortgage bonds |  | 2.25 |  |  | April 1, 2031 |  | 425 |  |  | 425 |
First mortgage bonds |  | 5.25 |  |  | July 15, 2035 |  | 250 |  |  | 250 |
First mortgage bonds |  | 6.25 |  |  | June 1, 2036 |  | 400 |  |  | 400 |
First mortgage bonds |  | 6.20 |  |  | July 1, 2037 |  | 350 |  |  | 350 |
First mortgage bonds |  | 5.35 |  |  | Nov. 1, 2039 |  | 300 |  |  | 300 |
First mortgage bonds |  | 4.85 |  |  | Aug. 15, 2040 |  | 250 |  |  | 250 |
First mortgage bonds |  | 3.40 |  |  | Aug. 15, 2042 |  | 500 |  |  | 500 |
First mortgage bonds |  | 4.125 |  |  | May 15, 2044 |  | 300 |  |  | 300 |
First mortgage bonds |  | 4.00 |  |  | Aug. 15, 2045 |  | 300 |  |  | 300 |
First mortgage bonds |  | 3.60 |  |  | May 15, 2046 |  | 350 |  |  | 350 |
First mortgage bonds |  | 3.60 |  |  | Sept. 15, 2047 |  | 600 |  |  | 600 |
First mortgage bonds |  | 2.90 |  |  | March 1, 2050 |  | 600 |  |  | 600 |
First mortgage bonds |  | 2.60 |  |  | June 1, 2051 |  | 700 |  |  | 700 |
First mortgage bonds |  | 3.20 |  |  | April 1, 2052 |  | 425 |  |  | 425 |
First mortgage bonds (a) |  | 4.50 |  |  | June 1, 2052 |  | 500 |  |  | 500 |
First mortgage bonds (b) |  | 5.10 |  |  | May 15, 2053 |  | 800 |  |  | — |
Other long-term debt |  |  |  |  |  | 2 |  |  | 3 |
Unamortized discount |  |  |  |  |  | (49) |  |  | (45) |
Unamortized debt issuance cost |  |  |  |  |  | (73) |  |  | (66) |
Current maturities |  |  |  |  |  | — |  |  | (400) |
Total long-term debt |  |  |  |  |  | $ | 7,330 |  |  | $ | 6,542 |
(a)2022 financing. (b)2023 financing.
NSP-Wisconsin
Financing Instrument |  | Interest Rate |  | Maturity Date |  | 2023 |  | 2022
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 |  | 2.82 |  |  | May 1, 2051 |  | 100 |  |  | 100 |
First mortgage bonds (a) |  | 4.86 |  |  | Sept. 15, 2052 |  | 100 |  |  | 100 |
First mortgage bonds (b) |  | 5.30 |  |  | June 15, 2053 |  | 125 |  |  | — |
Unamortized discount |  |  |  |  |  | (3) |  |  | (3) |
Unamortized debt issuance cost |  |  |  |  |  | (11) |  |  | (11) |
Current maturities |  |  |  |  |  | (200) |  |  | — |
Total long-term debt |  |  |  |  |  | $ | 1,011 |  |  | $ | 1,086 |
(a)2022 financing. (b)2023 financing.
PSCo
Financing Instrument |  | Interest Rate |  | Maturity Date |  | 2023 |  | 2022
First mortgage bonds |  | 2.50 | % |  | March 15, 2023 |  | $ | — |  |  | $ | 250 |
First mortgage bonds |  | 2.90 |  |  | May 15, 2025 |  | 250 |  |  | 250 |
First mortgage bonds |  | 3.70 |  |  | June 15, 2028 |  | 350 |  |  | 350 |
First mortgage bonds |  | 1.90 |  |  | Jan. 15, 2031 |  | 375 |  |  | 375 |
First mortgage bonds |  | 1.875 |  |  | June 15, 2031 |  | 750 |  |  | 750 |
First mortgage bonds (a) |  | 4.10 |  |  | June 1, 2032 |  | 300 |  |  | 300 |
First mortgage bonds |  | 6.25 |  |  | Sept. 1, 2037 |  | 350 |  |  | 350 |
First mortgage bonds |  | 6.50 |  |  | Aug. 1, 2038 |  | 300 |  |  | 300 |
First mortgage bonds |  | 4.75 |  |  | Aug. 15, 2041 |  | 250 |  |  | 250 |
First mortgage bonds |  | 3.60 |  |  | Sept. 15, 2042 |  | 500 |  |  | 500 |
First mortgage bonds |  | 3.95 |  |  | March 15, 2043 |  | 250 |  |  | 250 |
First mortgage bonds |  | 4.30 |  |  | March 15, 2044 |  | 300 |  |  | 300 |
First mortgage bonds |  | 3.55 |  |  | June 15, 2046 |  | 250 |  |  | 250 |
First mortgage bonds |  | 3.80 |  |  | June 15, 2047 |  | 400 |  |  | 400 |
First mortgage bonds |  | 4.10 |  |  | June 15, 2048 |  | 350 |  |  | 350 |
First mortgage bonds |  | 4.05 |  |  | Sept. 15, 2049 |  | 400 |  |  | 400 |
First mortgage bonds |  | 3.20 |  |  | March 1, 2050 |  | 550 |  |  | 550 |
First mortgage bonds |  | 2.70 |  |  | Jan. 15, 2051 |  | 375 |  |  | 375 |
First mortgage bonds (a) |  | 4.50 |  |  | June 1, 2052 |  | 400 |  |  | 400 |
First mortgage bonds (b) |  | 5.25 |  |  | April 1, 2053 |  | 850 |  |  | — |
Unamortized discount |  |  |  |  |  | (41) |  |  | (37) |
Unamortized debt issuance cost |  |  |  |  |  | (59) |  |  | (53) |
Current maturities |  |  |  |  |  | — |  |  | (250) |
Total long-term debt |  |  |  |  |  | $ | 7,450 |  |  | $ | 6,610 |
(a)2022 financing. (b)2023 financing.
SPS
Financing Instrument |  | Interest Rate |  | Maturity Date |  | 2023 |  | 2022
First mortgage bonds |  | 3.30 | % |  | June 15, 2024 |  | $ | 150 |  |  | $ | 150 |
First mortgage bonds |  | 3.30 |  |  | June 15, 2024 |  | 200 |  |  | 200 |
Unsecured senior notes |  | 6.00 |  |  | Oct. 1, 2033 |  | 100 |  |  | 100 |
Unsecured senior notes |  | 6.00 |  |  | Oct. 1, 2036 |  | 250 |  |  | 250 |
First mortgage bonds |  | 4.50 |  |  | Aug. 15, 2041 |  | 200 |  |  | 200 |
First mortgage bonds |  | 4.50 |  |  | Aug. 15, 2041 |  | 100 |  |  | 100 |
First mortgage bonds |  | 4.50 |  |  | Aug. 15, 2041 |  | 100 |  |  | 100 |
First mortgage bonds |  | 3.40 |  |  | Aug. 15, 2046 |  | 300 |  |  | 300 |
First mortgage bonds |  | 3.70 |  |  | Aug. 15, 2047 |  | 450 |  |  | 450 |
First mortgage bonds |  | 4.40 |  |  | Nov. 15, 2048 |  | 300 |  |  | 300 |
First mortgage bonds |  | 3.75 |  |  | June 15, 2049 |  | 300 |  |  | 300 |
First mortgage bonds |  | 3.15 |  |  | May 1, 2050 |  | 350 |  |  | 350 |
First mortgage bonds |  | 3.15 |  |  | May 1, 2050 |  | 250 |  |  | 250 |
First mortgage bonds (a) |  | 5.15 |  |  | June 1, 2052 |  | 200 |  |  | 200 |
First mortgage bonds (b) |  | 6.00 |  |  | Sept. 15, 2053 |  | 100 |  |  | — |
Unamortized discount |  |  |  |  |  | (10) |  |  | (10) |
Unamortized debt issuance cost |  |  |  |  |  | (29) |  |  | (29) |
Current maturities |  |  |  |  |  | (350) |  |  | — |
Total long-term debt |  |  |  |  |  | $ | 2,961 |  |  | $ | 3,211 |
(a)2022 financing. (b)2023 financing.
Schedule of Maturities of Long-term Debt |
(Millions of Dollars) |  |
2024 |  | $ | 552 |
2025 |  | 1,103 |
2026 |  | 501 |
2027 |  | 501 |
2028 |  | 1,133 |
Schedule of Stock by Class [Table Text Block] | Capital Stock — Preferred stock authorized/outstanding:
|  | Preferred Stock Authorized (Shares) |  | Par Value of Preferred Stock |  | Preferred Stock Outstanding (Shares) 2023 and 2022
Xcel Energy Inc. |  | 7,000,000 |  |  | $ | 100 |  |  | — |
PSCo |  | 10,000,000 |  |  | 0.01 |  |  | — |
SPS |  | 10,000,000 |  |  | 1.00 |  |  | — |
Xcel Energy Inc. had the following common stock authorized/outstanding:
Common Stock Authorized (Shares) |  | Par Value of Common Stock |  | Common Stock Outstanding (Shares) as of Dec. 31, 2023 |  | Common Stock Outstanding (Shares) as of Dec. 31, 2022
1,000,000,000 |  |  | $ | 2.50 |  |  | 554,941,703 |  |  | 549,578,018 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] | Requirements and actuals as of Dec. 31, 2023:
|  | Equity to Total Capitalization Ratio Required Range |  | Equity to Total Capitalization Ratio Actual
|  | Low |  | High |  | 2023
NSP-Minnesota |  | 47.2 | % |  | 57.6 | % |  | 52.3 | %
NSP-Wisconsin (a) |  | 52.5 |  |  | N/A |  | 52.7 |
SPS (b) |  | 45.0 |  |  | 55.0 |  |  | 54.6 |
(a) Cannot pay annual dividends in excess of forecasted levels if its average equity-to-total capitalization ratio falls below the commission authorized level. (b) Excludes short-term debt.
(Amounts in Millions) |  | Unrestricted Retained Earnings |  | Total Capitalization |  | Limit on Total Capitalization
NSP-Minnesota |  | $ | 1,508 |  |  | $ | 15,702 |  |  | $ | 16,140 |
NSP-Wisconsin |  | 9 |  |  | 2,520 |  |  | N/A
SPS (a) |  | 617 |  |  | 7,298 |  |  | N/A
(a)May not pay a dividend that would cause a loss of its investment grade bond rating.
Other Capital Restrictions | Amounts authorized to issue as of Dec. 31, 2023:
(Millions of Dollars) |  | Long-Term Debt |  | Short-Term Debt |
NSP-Minnesota |  | 52.8% of total capitalization | (a) | $ | 2,400 |  | (a)
NSP-Wisconsin |  | $ | 625 |  |  | 150 |  |
PSCo |  | 450 |  |  | 800 |  |
SPS |  | 100 |  |  | 600 |  |
(a)NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.

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