CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 35,114	$ (338)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	259,841	250,651
Allowance for equity funds used during construction	(14,782)	(13,249)
Deferred income taxes	3,245	795
Deferred investment tax credit	(1,090)	36
Stock compensation	8,252	7,160
Changes in current assets and liabilities:
Customer and other receivables	79,215	93,800
Accrued unbilled revenues	(34,891)	134
Materials, supplies and fossil fuel	2,000	(2,770)
Income tax receivable	(2,437)	0
Deferred fuel and purchased power	(26,521)	(25,228)
Deferred fuel and purchased power amortization	120,157	84,789
Other current assets	(23,346)	(15,008)
Accounts payable	(79,111)	56,010
Accrued taxes	53,401	56,520
Other current liabilities	(41,432)	(41,391)
Change in long-term regulatory assets	2,611	17,614
Change in long-term regulatory liabilities	(58,507)	12,033
Change in other long-term assets	(17,201)	(45,413)
Change in operating lease assets	(5,826)	3,889
Change in other long-term liabilities	(27,917)	(40,427)
Change in operating lease liabilities	4,521	2,288
Net cash provided by operating activities	235,296	401,895
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(628,361)	(622,552)
Contributions in aid of construction	90,226	51,244
Allowance for borrowed funds used during construction	(9,863)	(10,102)
Proceeds from nuclear decommissioning trusts sales and other special use funds	512,234	485,814
Investment in nuclear decommissioning trusts and other special use funds	(513,001)	(486,385)
Other	(2,783)	(4,134)
Net cash used for investing activities	(551,548)	(586,115)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	594,840	0
Short-term borrowings and (repayments), net	(162,905)	301,747
Dividends paid on common stock	(108,462)	(104,934)
Common stock equity issuance and (purchases), net	(7,415)	(6,381)
Other	(1)	(3)
Net cash provided by financing activities	316,057	190,429
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(195)	6,209
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	6,604	3,838
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 6,409	$ 10,047