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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Commercial Paper | Short-Term Debt — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper, term loan borrowings and letters of credit under their credit facilities. Short-term debt borrowings outstanding for Xcel Energy were as follows:
|  | Three Months Ended Dec. 31, 2018 |  | Year Ended Dec. 31
(Amounts in Millions, Except Interest Rates) |  |  | 2018 |  | 2017 |  | 2016
Borrowing limit |  | $ | 3,250 |  |  | $ | 3,250 |  |  | $ | 3,250 |  |  | $ | 2,750 |
Amount outstanding at period end |  | 1,038 |  |  | 1,038 |  |  | 814 |  |  | 392 |
Average amount outstanding |  | 500 |  |  | 788 |  |  | 644 |  |  | 485 |
Maximum amount outstanding |  | 1,038 |  |  | 1,349 |  |  | 1,247 |  |  | 1,183 |
Weighted average interest rate, computed on a daily basis |  | 2.76 | % |  | 2.34 | % |  | 1.35 | % |  | 0.74 | %
Weighted average interest rate at end of period |  | 2.97 |  |  | 2.97 |  |  | 1.90 |  |  | 0.95 |
Schedule of Debt To Total Capitalization Ratio | Features of the credit facilities:
|  | Debt-to-Total Capitalization Ratio(a) |  | Amount Facility May Be Increased (millions) |  | Additional Periods For Which a One-Year Extension May Be Requested (b)
|  | 2018 |  | 2017 |  |  |  |
Xcel Energy Inc. (c) |  | 58 | % |  | 58 | % |  | $ | 200 |  |  | 2 |
NSP-Wisconsin |  | 48 |  |  | 47 |  |  | N/A |  |  | 1 |
NSP-Minnesota |  | 48 |  |  | 48 |  |  | 100 |  |  | 2 |
SPS |  | 46 |  |  | 46 |  |  | 50 |  |  | 2 |
PSCo |  | 46 |  |  | 44 |  |  | 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) | All extension requests are subject to majority bank group approval.
(c) | The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will 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 | Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available as of Dec. 31, 2018:
(Millions of Dollars) |  | Credit Facility (a) |  | Drawn (b) |  | Available
Xcel Energy Inc. |  | $ | 1,500 |  |  | $ | 488 |  |  | $ | 1,012 |
PSCo |  | 700 |  |  | 317 |  |  | 383 |
NSP-Minnesota |  | 500 |  |  | 187 |  |  | 313 |
SPS |  | 400 |  |  | 44 |  |  | 356 |
NSP-Wisconsin |  | 150 |  |  | 51 |  |  | 99 |
Total |  | $ | 3,250 |  |  | $ | 1,087 |  |  | $ | 2,163 |
(a) | These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.
(b) | Includes outstanding commercial paper, term loan borrowings and letters of credit.
Schedule of Capitalization | Long term debt obligations for Xcel Energy Inc. and its utility subsidiaries as of Dec. 31:
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
Xcel Energy Inc. |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  | 2020 - 2041 |  | 2.40% - 6.50% |  | 1.20% - 6.50% |  | $ | 3,400 |  |  | $ | 2,900 |
Elimination of PSCo capital lease obligation with affiliates |  |  |  |  |  |  |  | (60 | ) |  | (62 | )
Unamortized discount |  |  |  |  |  |  |  | (5 | ) |  | (2 | )
Unamortized debt issuance cost |  |  |  |  |  |  |  | (21 | ) |  | (20 | )
Current maturities (Capital lease obligation) |  |  |  |  |  |  |  | 2 |  |  | 2 |
Total |  |  |  |  |  |  |  | $ | 3,316 |  |  | $ | 2,818 |
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
NSP-Minnesota |  |  |  |  |  |  |  |  |  |
Mortgage bonds |  | 2020 - 2047 |  | 2.15% - 7.13% |  | 2.15% - 7.13% |  | $ | 5,000 |  |  | $ | 5,000 |
Unamortized discount |  |  |  |  |  |  |  | (21 | ) |  | (22 | )
Unamortized debt issuance cost |  |  |  |  |  |  |  | (42 | ) |  | (45 | )
Current maturities |  |  |  |  |  |  |  | — |  |  | — |
Total |  |  |  |  |  |  |  | $ | 4,937 |  |  | $ | 4,933 |
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
NSP-Wisconsin |  |  |  |  |  |  |  |  |  |
Mortgage bonds |  | 2024 - 2048 |  | 3.3% - 6.38% |  | 3.3% - 6.38% |  | $ | 800 |  |  | $ | 750 |
City of La Crosse resource recovery bond |  | 2021 |  | 6.00% |  | 6.00% |  | 19 |  |  | 19 |
Other |  |  |  |  |  |  |  | — |  |  | 2 |
Unamortized discount |  |  |  |  |  |  |  | (3 | ) |  | (3 | )
Unamortized debt issuance cost |  |  |  |  |  |  |  | (9 | ) |  | (7 | )
Current maturities |  |  |  |  |  |  |  | — |  |  | (151 | )
Total |  |  |  |  |  |  |  | $ | 807 |  |  | $ | 610 |
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
PSCo |  |  |  |  |  |  |  |  |  |
Capital lease obligations |  | 2025 - 2060 |  | 11.20% - 14.30% |  | 11.20% - 14.30% |  | $ | 145 |  |  | $ | 151 |
Mortgage bonds |  | 2019 - 2048 |  | 2.25% - 6.50% |  | 2.25% - 6.50% |  | 4,900 |  |  | 4,500 |
Unamortized discount |  |  |  |  |  |  |  | (14 | ) |  | (13 | )
Unamortized debt issuance cost |  |  |  |  |  |  |  | (33 | ) |  | (29 | )
Current maturities |  |  |  |  |  |  |  | (406 | ) |  | (306 | )
Total |  |  |  |  |  |  |  | $ | 4,592 |  |  | $ | 4,303 |
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
SPS |  |  |  |  |  |  |  |  |  |
Mortgage bonds |  | 2024 - 2048 |  | 3.30% - 4.50% |  | 3.30% - 4.50% |  | $ | 1,800 |  |  | $ | 1,500 |
Unsecured senior notes |  | 2033 - 2036 |  | 6.00% |  | 6.00% - 8.75% |  | 350 |  |  | 350 |
Unamortized discount |  |  |  |  |  |  |  | (4 | ) |  | (2 | )
Unamortized debt issuance cost |  |  |  |  |  |  |  | (20 | ) |  | (18 | )
Current maturities |  |  |  |  |  |  |  | — |  |  | — |
Total |  |  |  |  |  |  |  | $ | 2,126 |  |  | $ | 1,830 |
(Millions of Dollars) |  | Maturity Range |  | Interest Rate Range 2018 |  | Interest Rate Range 2017 |  | 2018 |  | 2017
Other Subsidiaries |  |  |  |  |  |  |  |  |  |
Various Eloigne Co. affordable housing project notes |  | 2019 - 2052 |  | 0.00% - 6.90% |  | 0.00% - 7.05% |  | $ | 26 |  |  | $ | 28 |
Current maturities |  |  |  |  |  |  |  | (1 | ) |  | (2 | )
Total |  |  |  |  |  |  |  | $ | 25 |  |  | $ | 26 |
Schedule of Maturities of Long-term Debt | Maturities of long-term debt:
(Millions of Dollars) |  |
2019 |  | $ | 406 |
2020 |  | 1,257 |
2021 |  | 425 |
2022 |  | 902 |
2023 |  | 653 |
Schedule of Long-Term Debt Issuances | 2018 financings:
|  | Amount |  | Financing Instrument |  | Interest Rate |  | Maturity Date
Xcel Energy Inc. |  | $500 million |  | Senior Notes |  | 4.00 | % |  | June 15, 2028
PSCo |  | 350 million |  | First mortgage bonds |  | 3.70 |  |  | June 15, 2028
PSCo |  | 350 million |  | First mortgage bonds |  | 4.10 |  |  | June 15, 2048
NSP-Wisconsin |  | 200 million |  | First mortgage bonds |  | 4.20 |  |  | Sept. 1, 2048
SPS |  | 300 million |  | First mortgage bonds |  | 4.40 |  |  | Nov 15, 2048
2017 financings:
|  | Amount |  | Financing Instrument |  | Interest Rate |  | Maturity Date
PSCo |  | $400 million |  | First mortgage bonds |  | 3.80 | % |  | June 15, 2047
SPS |  | 450 million |  | First mortgage bonds |  | 3.70 |  |  | Aug. 15, 2047
NSP-Minnesota |  | 600 million |  | First mortgage bonds |  | 3.60 |  |  | Sept. 15, 2047
NSP-Wisconsin |  | 100 million |  | First mortgage bonds |  | 3.75 |  |  | Dec. 1, 2047
Capital Stock | Capital Stock — Preferred stock authorized/outstanding:
|  | Preferred Stock Authorized (Shares) |  | Par Value of Preferred Stock |  | Preferred Stock Outstanding (Shares) 2018 and 2017
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:
Commons Stock Authorized (Shares) |  | Par Value of Common Stock |  | Common Stock Outstanding (Shares) 2018 |  | Common Stock Outstanding (Shares) 2017
1 | billion |  | $ | 2.50 |  |  | 514,036,787 |  |  | 507,762,881 |
Other Capital Restrictions |
|  | Amount Authorized to Issue |
|  | Long-Term Debt |  | Short-Term Debt |
NSP-Minnesota |  | 52.93% of total capitalization |  | (a) | $ | 1.725 | billion | (a)
NSP-Wisconsin |  | $ | — |  | (b) | 150 | million |
SPS |  | — |  | (b) | 600 | million |
PSCo |  | 1.1 | billion |  | 800 | million |
(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.
(b) | SPS and NSP-Wisconsin will file for additional long-term debt authorization.
Authorizations as of Dec. 31, 2018:
|  | Amount Authorized to Issue |
|  | Long-Term Debt |  | Short-Term Debt |
NSP-Minnesota |  | 52.93% of total capitalization |  | (a) | $ | 1.725 | billion | (a)
NSP-Wisconsin |  | $ | — |  | (b) | 150 | million |
SPS |  | — |  | (b) | 600 | million |
PSCo |  | 1.1 | billion |  | 800 | million |
(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.
(b) | SPS and NSP-Wisconsin will file for additional long-term debt authorization.

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