CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 111,978	$ 189,880
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	416,652	405,127
Deferred fuel and purchased power	(191,304)	(98,707)
Deferred fuel and purchased power amortization	218,586	96,842
Allowance for equity funds used during construction	(28,095)	(21,833)
Deferred income taxes	(35,808)	22,169
Deferred investment tax credit	42,601	(2,538)
Change in derivative instruments fair value	(239)	0
Stock compensation	7,225	7,872
Changes in current assets and liabilities:
Customer and other receivables	(24,748)	(31,146)
Accrued unbilled revenues	(51,976)	(100,543)
Materials, supplies and fossil fuel	(42,156)	(34,315)
Income tax receivable	9,847	7,514
Other current assets	(35,609)	5,195
Accounts payable	(2,051)	104,849
Accrued taxes	(644)	13,282
Other current liabilities	(62,354)	(7,316)
Change in margin and collateral accounts - assets	28	40,430
Change in other long-term assets	(104,581)	174,013
Change in operating lease assets	17,998	29,759
Change in other long-term liabilities	162,181	(184,626)
Change in operating lease liabilities	30,082	(27,622)
Net cash provided by operating activities	437,613	588,286
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(918,195)	(843,219)
Contributions in aid of construction	60,118	68,879
Allowance for borrowed funds used during construction	(25,039)	(10,111)
Proceeds from nuclear decommissioning trusts sales and other special use funds	567,528	692,186
Investment in nuclear decommissioning trusts and other special use funds	(568,668)	(692,811)
Other	485	(9,174)
Net cash used for investing activities	(883,771)	(794,250)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	689,247	325,802
Short-term borrowing and (repayments) - net	(35,370)	249,000
Dividends paid on common stock	(192,235)	(188,542)
Repayment of long-term debt	0	(150,000)
Common stock equity issuances and (purchases) - net	(2,031)	(448)
Distributions to noncontrolling interests	(10,627)	(10,628)
Net cash provided by financing activities	448,984	225,184
NET INCREASE IN CASH AND CASH EQUIVALENTS	2,826	19,220
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	4,832	9,969
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 7,658	$ 29,189