v3.26.1
Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Lease, Cost
Leases
PPA operating lease payments are included in electric fuel and purchased power, and expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$11 $
Other operating leases (a)
Total operating lease expense$12 $10 
Six Months Ended June 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$22 $18 
Other operating leases (a)
Total operating lease expense$24 $20 
(a)Includes immaterial short-term lease expense.
Commitments under operating leases as of June 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$335 $42 $377 
Interest component of obligation(49)(9)(58)
Present value of minimum obligation$286 $33 319 
Less current portion(36)
Noncurrent operating lease liabilities$283 
Lessee, Operating Lease, Liability, Maturity
Commitments under operating leases as of June 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$335 $42 $377 
Interest component of obligation(49)(9)(58)
Present value of minimum obligation$286 $33 319 
Less current portion(36)
Noncurrent operating lease liabilities$283