v3.26.3
Segment Reporting
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
Segment Reporting
10. Segment Information
Segment information:
Three Months Ended Sept. 30
20262025
(Millions of Dollars)Regulated electric utilityRegulated electric utility
Operating revenues$738 $655 
Electric fuel and purchased power216 208 
O&M expenses99 86 
Depreciation and amortization128 118 
Other segment expenses, net12 18 
Interest charges and financing costs58 45 
Income tax expense9 20 
Net income$216 $160 
Nine Months Ended Sept. 30
20262025
(Millions of Dollars)Regulated electric utilityRegulated electric utility
Operating revenues$1,657 $1,684 
Electric fuel and purchased power432 582 
O&M expenses270 257 
Depreciation and amortization372 345 
Other segment expenses, net47 64 
Interest charges and financing costs148 133 
Income tax benefit(35)(17)
Net income$423 $320 
Other segment expenses, net, includes conservation and DSM expenses, taxes (other than income taxes), other income, net and AFUDC - equity.