Selected Balance Sheet Data (Tables)

3 Months Ended

Mar. 31, 2025

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of dollars)	March 31, 2025		Dec. 31, 2024
Accounts receivable, net
Accounts receivable	$	96	$	79
Less allowance for bad debts	(7)		(7)
Accounts receivable, net	$	89	$	72

Inventories

(Millions of dollars)	March 31, 2025		Dec. 31, 2024
Inventories
Materials and supplies	$	15	$	13
Fuel	10		10
Natural gas	1		5
Total inventories	$	26	$	28

Property, Plant and Equipment, Net

(Millions of dollars)	March 31, 2025		Dec. 31, 2024
Property, plant and equipment, net
Electric plant	$	4,170	$	4,103
Natural gas plant	555		547
Common and other property	311		309
Construction work in progress	468		406
Total property, plant and equipment	5,504		5,365
Less accumulated depreciation	(1,725)		(1,695)
Property, plant and equipment, net	$	3,779	$	3,670