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Fair Value of Financial Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Gross Notional Amounts of Commodity FTRs
Amounts in Millions (a)
June 30, 2025Dec. 31, 2024
MWh of electricity17 7 
(a)Not reflective of net positions in the underlying commodities.
Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis by Hierarchy Level
June 30, 2025Dec. 31, 2024
Fair ValueFair Value Total
Netting (a)
TotalFair ValueFair Value Total
Netting (a)
Total
(Millions of Dollars)Level 1Level 2Level 3Level 1Level 2Level 3
Current derivative assets
Other derivative instruments:
Electric commodity$— $— $184 $184 $— $184 $— $— $67 $67 $— $67 
Total current derivative assets$— $— $184 $184 $— $184 $— $— $67 $67 $— $67 
(a)SPS nets derivative instruments and related collateral on its balance sheet when supported by a legally enforceable master netting agreement. At June 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
Changes in Level 3 Commodity Derivatives
Three Months Ended June 30
(Millions of Dollars)20252024
Balance at April 1$103 $52 
Purchases (a)
132 102 
Settlements (a)
(74)(83)
Net transactions recorded during the period:
Net gains recognized as regulatory assets and liabilities (a)
23 75 
Balance at June 30$184 $146 
Six Months Ended June 30
(Millions of Dollars)20252024
Balance at Jan. 1$67 $39 
Purchases (a)
198 105 
Settlements (a)
(122)(119)
Net transactions recorded during the period:
Net gains recognized as regulatory assets and liabilities (a)
41 121 
Balance at June 30$184 $146 
(a)Relates primarily to FTR instruments administered by SPP.
Carrying Amount and Fair Value of Long-term Debt
June 30, 2025Dec. 31, 2024
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$4,046 $3,462 $3,551 $2,968 
Derivative Instruments, Gain (Loss)
Pre-Tax Fair Value Gains Recognized During the Period in:
(Millions of Dollars)Regulatory Assets and Liabilities
Three Months Ended June 30, 2025
Other derivative instruments:
Electric commodity$12 
Total$12 
Six Months Ended June 30, 2025
Other derivative instruments:
Electric commodity$20 
Total$20 
Three Months Ended June 30, 2024
Other derivative instruments:
Electric commodity$41 
Total$41 
Six Months Ended June 30, 2024
Other derivative instruments:
Electric commodity$40 
Total$40 
Pre-Tax Gains Reclassified into Income During the Period from:
(Millions of Dollars)Regulatory Assets and Liabilities
Three Months Ended June 30, 2025
Other derivative instruments:
Electric commodity$(19)
(a)
Total$(19)
Six Months Ended June 30, 2025
Other derivative instruments:
Electric commodity$(29)
(a)
Total$(29)
Three Months Ended June 30, 2024
Other derivative instruments:
Electric commodity$(16)
(a)
Total$(16)
Six Months Ended June 30, 2024
Other derivative instruments:
Electric commodity$(8)
(a)
Total$(8)
(a)Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.