v3.26.1
Commitment and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Components of Lease Expense
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$19 $20 
Other operating leases (a)
2 4 
Total operating lease expense$21 $24 
Finance leases
Amortization of ROU assets$1 $1 
Interest expense on lease liability8 3 
Total finance lease expense$9 $4 

Six Months Ended June 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$38 $43 
Other operating leases (a)
4 8 
Total operating lease expense$42 $51 
Finance leases
Amortization of ROU assets$2 $2 
Interest expense on lease liability13 7 
Total finance lease expense$15 $9 
(a)Includes immaterial short-term lease expense.
Schedule of Future Commitments under Operating Leases
Commitments under operating and finance leases as of June 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeaseTotal Operating LeasesFinance Leases
Total minimum obligation$237 $338 $575 $505 
Interest component of obligation(31)(161)(192)(307)
Present value of minimum obligation$206 $177 383 198 
Less current portion(60)(4)
Noncurrent operating and finance lease liabilities$323 $194