v3.26.1
Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2026
Segment Reporting [Abstract]  
Segment Reporting :
Three Months Ended June 30, 2026
(Millions of Dollars)Regulated electric utilityRegulated natural gas utilityTotal segments
Operating revenues (a)
$257 $25 $282 
Electric fuel and purchased power74 — 74 
Cost of natural gas sold and transported— 9 9 
O&M expenses58 8 66 
Depreciation and amortization47 7 54 
Other segment expenses, net
6 2 8 
Interest charges and financing costs18 3 21 
Income tax expense (benefit)13 (2)11 
Net income (loss)$41 $(2)$39 
(a)Operating revenues include $64 million of affiliate electric revenue.
Three Months Ended June 30, 2025
(Millions of Dollars)Regulated electric utilityRegulated natural gas utilityTotal segments
Operating revenues (a)
$253 $24 $277 
Electric fuel and purchased power103 — 103 
Cost of natural gas sold and transported— 9 9 
O&M expenses52 8 60 
Depreciation and amortization42 8 50 
Other segment expenses, net
5 1 6 
Interest charges and financing costs13 2 15 
Income tax expense (benefit)9 (1)8 
Net income (loss)$29 $(3)$26 
(a)Operating revenues include $55 million of affiliate electric revenue.
Six Months Ended June 30, 2026
(Millions of Dollars)Regulated electric utilityRegulated natural gas utilityTotal segments
Operating revenues (a)
$555 $108 $663 
Intersegment revenue— (1)(1)
Total segment revenues555 107 662 
Electric fuel and purchased power183 — 183 
Cost of natural gas sold and transported— 51 51 
O&M expenses115 16 131 
Depreciation and amortization93 15 108 
Other segment expenses, net
12 2 14 
Interest charges and financing costs34 5 39 
Income tax expense 28 4 32 
Net income $90 $14 $104 
(a)Operating revenues include $132 million of affiliate electric revenue.
Six Months Ended June 30, 2025
(Millions of Dollars)Regulated electric utilityRegulated natural gas utilityTotal segments
Operating revenues (a)
$512 $92 $604 
Electric fuel and purchased power209 — 209 
Cost of natural gas sold and transported— 42 42 
O&M expenses106 17 123 
Depreciation and amortization84 15 99 
Other segment expenses, net
11 1 12 
Interest charges and financing costs28 3 31 
Income tax expense 16 4 20 
Net income $58 $10 $68 
(a)Operating revenues include $111 million of affiliate electric revenue.