v3.25.2
Commitment and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Components of Lease Expense
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20252024
Operating leases
PPA capacity payments$20 $20 
Other operating leases (a)
4 5 
Total operating lease expense (b)
$24 $25 
Finance leases
Amortization of ROU assets$1 $1 
Interest expense on lease liability3 3 
Total finance lease expense$4 $4 
(a)Includes immaterial short-term lease expense.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Six Months Ended June 30
(Millions of Dollars)20252024
Operating leases
PPA capacity payments$43 $41 
Other operating leases (a)
8 10 
Total operating lease expense (b)
$51 $51 
Finance leases
Amortization of ROU assets$2 $2 
Interest expense on lease liability7 7 
Total finance lease expense$9 $9 
(a)Includes immaterial short-term lease expense.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Schedule of Future Commitments under Operating Leases
Commitments under operating and finance leases as of June 30, 2025:
(Millions of Dollars)PPA Operating LeasesOther Operating LeaseTotal Operating LeasesFinance Leases
Total minimum obligation$321 $179 $500 $391 
Interest component of obligation(42)(62)(104)(282)
Present value of minimum obligation$279 $117 396 109 
Less current portion(73)(4)
Noncurrent operating and finance lease liabilities$323 $105