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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
2023
(Millions of Dollars)Jan. 1, 2023AccretionDec. 31, 2023
Electric
Steam and other production$83 $4 $87 
Wind54 2 56 
Distribution10 — 10 
Total liability$147 $6 $153 
2022
(Millions of Dollars)Jan. 1, 2022Accretion
Cash Flow Revisions (a)
Dec. 31, 2022
Electric
Steam and other production$54 $3 $26 $83 
Wind52 2 — 54 
Distribution10 — — 10 
Total liability$116 $5 $26 $147 
(a) In 2022, AROs were revised for changes in estimates of cash flows. Revisions in steam and other production AROs primarily related to changes in costs for steam production ponds remediation.
Assets and Liabilities, Lessee [Table Text Block]
Operating lease ROU assets:
(Millions of Dollars)Dec. 31, 2023Dec. 31, 2022
PPAs$500 $500 
Other44 44 
Gross operating lease ROU assets544 544 
Accumulated amortization(141)(110)
Net operating lease ROU assets$403 $434 
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202320222021
Operating leases
PPA capacity payments$53 $53 $53 
Other operating leases (a)
4 4 4 
Total operating lease expense (b)
$57 $57 $57 
(a)Includes immaterial short-term lease expense for 2023, 2022 and 2021.
(b)PPA capacity payments are included in electric fuel and purchased power on the statements of income. Expense for other operating leases is included in O&M expense.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Commitments under operating leases as of Dec. 31, 2023:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
2024$46 $3 $49 
202546 3 49 
202646 3 49 
202746 4 50 
202846 4 50 
Thereafter220 33 253 
Total minimum obligation450 50 500 
Interest component of obligation(85)(12)(97)
Present value of minimum obligation365 38 403 
Less current portion(32)
Noncurrent operating and finance lease liabilities$371 
Weighted-average remaining lease term in years10
(a)Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.
(b)PPA operating leases contractually expire at various dates through 2033.
 [1]
Estimated Future Payments for Capacity and Energy Pursuant to Purchased Power Agreements
At Dec. 31, 2023, the estimated future payments for capacity and energy that SPS is obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:
(Millions of Dollars)Capacity
Energy (a)
2024$14 $33 
202516 40 
202616 38 
2027— — 
2028— — 
Thereafter— — 
Total$46 $111 
(a)Excludes contingent energy payments for renewable energy PPAs.
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2023:
(Millions of Dollars)CoalNatural gas
supply		Natural gas
storage and
transportation
2024$86 $21 $33 
202520 — 29 
202620 — 24 
202720 — 24 
202820 — 17 
Thereafter— — 6 
Total$166 $21 $133 
[1] Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.