STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues [Abstract]
Operating revenue	$ 2,426	$ 2,465	$ 1,870
Operating expenses
Electric fuel and purchased power	1,157	1,432	835
Operating and maintenance expenses	317	271	275
Demand side management program expenses	23	17	16
Depreciation and amortization	388	300	295
Taxes (other than income taxes)	107	79	90
Total operating expenses	1,992	2,099	1,511
Operating income	434	366	359
Other income (expense), net	0	1	(2)
Allowance for funds used during construction — equity	3	4	33
Interest charges and financing costs
Interest Expense	143	114	119
Allowance for funds used during construction — debt	(2)	(2)	(14)
Total interest charges and financing costs	141	112	105
Income before income taxes	296	259	285
Income taxes	(53)	(59)	(10)
Net income	$ 349	$ 318	$ 295