CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 180	$ 171	$ 155
Non-cash items included in net income:
Depreciation and amortization	274	265	253
Provision for deferred income taxes	(5)	(37)	(18)
Power and natural gas cost amortizations (deferrals), net	104	7	(78)
Amortization of debt expense	2	3	2
Stock-based compensation expense	9	8	9
Equity-related AFUDC	(9)	(7)	(7)
Pension and other postretirement benefit expense	12	14	32
Other regulatory assets and liabilities	(28)	(34)	(15)
Other non-current assets and liabilities	36	26	(5)
Change in decoupling regulatory deferral	(35)	(3)	33
Realized and unrealized losses (gains) on assets and investments	5	3	(50)
Other	(4)	(6)	12
Contributions to defined benefit pension plan	(10)	(10)	(42)
Cash paid on settlement of interest rate swap agreements			(17)
Cash received on settlement of interest rate swap agreements	4	8
Changes in certain current assets and liabilities:
Accounts and notes receivable	3	37	(56)
Inventory	(40)	(52)	(23)
Collateral posted for derivative instruments	18	129	(141)
Income taxes receivable	(3)	2	(1)
Other current assets	16	(26)	(7)
Accounts payable	(8)	(66)	66
Other current liabilities	13	15	22
Net cash provided by operating activities	534	447	124
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(533)	(499)	(452)
Issuance of notes receivable		(3)	(3)
Equity and property investments	(10)	(13)	(10)
Proceeds from sale of investments		3	1
Other	4	2	4
Net cash used in investing activities	(539)	(510)	(460)
Financing Activities:
Net increase (decrease) in short-term borrowings	5	(114)	179
Proceeds from issuance of long-term debt	84	250	400
Maturity of long-term debt and finance leases	(3)	(17)	(253)
Issuance of common stock, net of issuance costs	68	113	137
Cash dividends paid	(150)	(141)	(129)
Other	(4)	(6)	(7)
Net cash provided by financing activities		85	327
Net increase (decrease) in cash and cash equivalents	(5)	22	(9)
Cash and cash equivalents at beginning of year	35	13	22
Cash and cash equivalents at end of year	30	35	13
Cash paid (received) during the year:
Interest	141	132	107
Income taxes paid	12	3	2
Income tax refunds	(1)	(1)
Non-cash financing and investing activities:
Accounts payable for capital expenditures	$ 24	$ 34	$ 28