CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating revenues
Electric, non-affiliates	$ 178	$ 171
Electric, affiliates	46	41
Natural gas	57	45
Total operating revenues	281	257
Operating expenses
Electric fuel and purchased power, non-affiliates	5	3
Purchased power, affiliates	100	94
Cost of natural sold and transported	31	21
Operating and maintenance expenses	49	49
Conservation program expenses	3	3
Depreciation and amortization	37	39
Taxes (other than income taxes)	7	7
Total operating expenses	232	216
Operating income	49	41
Other expense, net	0	(2)
Allowance for funds used during construction — equity	1	1
Interest charges and financing costs
Interest charges	9	10
Allowance for funds used during construction — debt	0	(1)
Total interest charges and financing costs	9	9
Income before income taxes	41	31
Income tax expense (benefit)	9	(3)
Net income	$ 32	$ 34