v3.26.3
Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 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 Sept. 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$13 $10 
Other operating leases (a)
1 1 
Total operating lease expense$14 $11 
Nine Months Ended Sept. 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$35 $28 
Other operating leases (a)
3 3 
Total operating lease expense$38 $31 
(a)Includes immaterial short-term lease expense.
Commitments under operating leases as of Sept. 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$324 $40 $364 
Interest component of obligation(46)(8)(54)
Present value of minimum obligation$278 $32 310 
Less current portion(37)
Noncurrent operating lease liabilities$273 
Lessee, Operating Lease, Liability, Maturity
Commitments under operating leases as of Sept. 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$324 $40 $364 
Interest component of obligation(46)(8)(54)
Present value of minimum obligation$278 $32 310 
Less current portion(37)
Noncurrent operating lease liabilities$273