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Borrowings and Other Financing Instruments Long-Term Borrowings and Other Financing Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Long-Term Borrowings and Other Financing Instruments    
Long-term Debt, Gross $ 25,465 $ 23,964
2024 552  
2025 1,103  
2026 501  
2027 501  
2028 1,133  
Xcel Energy Inc.    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount (8) (7)
Unamortized Debt Issuance Expense (36) (35)
Current Maturities 0 (500)
Long-term Debt 6,136 5,338
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2026 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.35%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due March 15, 2027    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 1.75%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 130 130
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2029 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2030    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Nov. 15, 2031    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.35%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due July 1, 2036 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Sept. 15, 2041 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.80%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2049 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2032    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [1] $ 700 700
Debt Instrument, Interest Rate, Stated Percentage [1] 4.60%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Aug. 15, 2033    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [2] $ 800 0
Debt Instrument, Interest Rate, Stated Percentage [2] 5.45%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Oct. 15, 2023    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 0 500
Debt Instrument, Interest Rate, Stated Percentage 0.50%  
NSP Minnesota    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (49) (45)
Unamortized Debt Issuance Expense (73) (66)
Current Maturities 0 (400)
Long-term Debt 7,330 6,542
NSP Minnesota | Mortgage bonds | Series Due May 15, 2023 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 0 400
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
NSP Minnesota | Mortgage bonds | Series Due July 1, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 7.125%  
NSP Minnesota | Mortgage bonds | Series Due March 1, 2028 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 150 150
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
NSP Minnesota | Mortgage bonds | Series Due April 1, 2031    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 425 425
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
NSP Minnesota | Mortgage bonds | Series Due July 15, 2035 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 5.25%  
NSP Minnesota | Mortgage bonds | Series Due June 1, 2036 [Domain]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
NSP Minnesota | Mortgage bonds | Series Due July 1, 2037 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 6.20%  
NSP Minnesota | Mortgage bonds | Series Due Nov. 1, 2039 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 5.35%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2040 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.85%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2044 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.125%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2045 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
NSP Minnesota | Mortgage bonds | Series Due Sept. 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
NSP Minnesota | Mortgage bonds | Series Due March 1, 2050    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 2.90%  
NSP Minnesota | Mortgage bonds | Series Due June 1, 2051    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 700 700
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
NSP Minnesota | Mortgage bonds | Series Due April 1, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 425 425
Debt Instrument, Interest Rate, Stated Percentage 3.20%  
NSP Minnesota | Mortgage bonds | Series Due June 1, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [3] $ 500 500
Debt Instrument, Interest Rate, Stated Percentage [3] 4.50%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2053    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [4] $ 800 0
Debt Instrument, Interest Rate, Stated Percentage [4] 5.10%  
NSP Minnesota | Long-term Debt    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 2 3
NSP-Wisconsin    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount (3) (3)
Unamortized Debt Issuance Expense (11) (11)
Current Maturities (200) 0
Long-term Debt 1,011 1,086
NSP-Wisconsin | Mortgage bonds | Series Due Sept. 1, 2038 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 6.375%  
NSP-Wisconsin | Mortgage bonds | Series Due Oct. 1, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
NSP-Wisconsin | Mortgage bonds | Series Due Dec. 1, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
NSP-Wisconsin | Mortgage bonds | Series Due September 1, 2048 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 4.20%  
NSP-Wisconsin | Mortgage bonds | Series Due May 1, 2051    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.05%  
NSP-Wisconsin | Mortgage bonds | Series Due May 1, 2051 2    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 2.82%  
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
NSP-Wisconsin | Mortgage bonds | Series Due Sept. 15, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [5] $ 100 100
Debt Instrument, Interest Rate, Stated Percentage [5] 4.86%  
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2053    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [6] $ 125 0
Debt Instrument, Interest Rate, Stated Percentage [6] 5.30%  
PSCo    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (41) (37)
Unamortized Debt Issuance Expense (59) (53)
Current Maturities 0 (250)
Long-term Debt 7,450 6,610
PSCo | Mortgage bonds | Series Due June 15, 2028    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
PSCo | Mortgage bonds | Series Due March 1, 2050    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 550 550
Debt Instrument, Interest Rate, Stated Percentage 3.20%  
PSCo | Mortgage bonds | Series Due March 15, 2023 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 0 250
Debt Instrument, Interest Rate, Stated Percentage 2.50%  
PSCo | Mortgage bonds | Series Due May 15, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 2.90%  
PSCo | Mortgage bonds | Series Due Jan. 15, 2031    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 375 375
Debt Instrument, Interest Rate, Stated Percentage 1.90%  
PSCo | Mortgage bonds | Series Due June 15, 2031    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 750 750
Debt Instrument, Interest Rate, Stated Percentage 1.875%  
PSCo | Mortgage bonds | Series Due Sept. 1, 2037 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
PSCo | Mortgage bonds | Series Due Aug. 1, 2038 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
PSCo | Mortgage bonds | Series Due Aug. 15, 2041 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
PSCo | Mortgage bonds | Series Due Sept. 15, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
PSCo | Mortgage bonds | Series Due March 15, 2043 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.95%  
PSCo | Mortgage bonds | Series Due March 15, 2044 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.30%  
PSCo | Mortgage bonds | Series Due June 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.55%  
PSCo | Mortgage bonds | Series Due June 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 3.80%  
PSCo | Mortgage bonds | Series Due June 15, 2048    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 4.10%  
PSCo | Mortgage bonds | Series Due September 15, 2049    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 4.05%  
PSCo | Mortgage bonds | Series Due Jan. 15, 2051    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 375 375
Debt Instrument, Interest Rate, Stated Percentage 2.70%  
PSCo | Mortgage bonds | Series Due June 1, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [7] $ 400 400
Debt Instrument, Interest Rate, Stated Percentage [7] 4.50%  
PSCo | Mortgage bonds | Series Due June 1, 2032 2    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [7] $ 300 300
Debt Instrument, Interest Rate, Stated Percentage [7] 4.10%  
PSCo | Mortgage bonds | Series Due April 1, 2053    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [8] $ 850 0
Debt Instrument, Interest Rate, Stated Percentage [8] 5.25%  
SPS    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (10) (10)
Unamortized Debt Issuance Expense (29) (29)
Current Maturities (350) 0
Long-term Debt 2,961 3,211
SPS | Mortgage bonds | Series Due June 15, 2024 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 150 150
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
SPS | Mortgage bonds | Series Due June 15, 2024 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 4    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 3 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due August 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
SPS | Mortgage bonds | Series Due August 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 450 450
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
SPS | Mortgage bonds | Series Due Nov. 15, 2048 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.40%  
SPS | Mortgage bonds | Series Due June 15, 2049    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
SPS | Mortgage bonds | Series due May 1, 2050    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.15%  
SPS | Mortgage bonds | Series due May 1, 2050 2    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [9] $ 250 250
Debt Instrument, Interest Rate, Stated Percentage [9] 3.15%  
SPS | Mortgage bonds | Series Due June 1, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [10] $ 200 200
Debt Instrument, Interest Rate, Stated Percentage [10] 5.15%  
SPS | Mortgage bonds | Series Due Sept. 15, 2053    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 0
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
SPS | Unsecured Debt [Member] | Senior C and D Due Oct. 1, 2033 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
SPS | Unsecured Debt [Member] | Senior F Due Oct. 1, 2036 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Other Subsidiaries    
Long-Term Borrowings and Other Financing Instruments    
Current Maturities $ (2) (1)
Long-term Debt 25 26
Other Subsidiaries | Various Eloigne Co. affordable housing project notes    
Long-Term Borrowings and Other Financing Instruments    
Long-term Debt, Gross $ 27 $ 27
[1] 2022 financing
[2] 2023 financing
[3] 2022 financing.
[4] 2023 financing.
[5] 2022 financing.
[6] 2023 financing.
[7] 2022 financing
[8] 2023 financing.
[9] 2022 financing.
[10] 2023 financing