Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net margin	$ 42,824	$ 40,147
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization, including nuclear fuel	196,729	203,299
Accretion cost	32,230	27,392
Amortization of deferred gains	(894)	(894)
Allowance for equity funds used during construction	(307)	(291)
Deferred outage costs	(22,985)	(23,107)
(Gain) loss on sale of investments	(9,989)	18,467
Regulatory deferral of costs associated with nuclear decommissioning	(5,371)	(33,956)
Other	(723)	642
Change in operating assets and liabilities:
Receivables	34,021	(123,344)
Inventories	(23,876)	(21,933)
Prepayments and other current assets	(5,886)	(20,532)
Accounts payable	(98,977)	17,584
Accrued interest	(22,699)	(16,253)
Accrued taxes	(19,844)	35,915
Other current liabilities	(55,884)	64,929
Member power bill prepayments	(13,018)	(12,478)
Rate management program (disbursements) collections	(25,185)	13,960
Total adjustments	(42,658)	129,400
Net cash provided by operating activities	166	169,547
Cash flows from investing activities:
Property additions	(495,134)	(526,406)
Plant acquisition	(16,743)	0
Activity in nuclear decommissioning trust fund—Purchases	(217,394)	(199,140)
Activity in nuclear decommissioning trust fund - Proceeds	213,108	195,557
Decrease in restricted investments	74,031	184,812
Activity in other long-term investments—Purchases	(95,750)	(134,310)
Activity in other long-term investments - Proceeds	98,756	102,982
Other	20,100	2,615
Net cash used in investing activities	(419,026)	(373,890)
Cash flows from financing activities:
Long-term debt proceeds	38,401	792,503
Long-term debt payments	(213,972)	(256,747)
Increase (decrease) in short-term borrowings, net	409,237	(334,689)
Other	24,381	14,493
Net cash provided by financing activities	258,047	215,560
Net (decrease) increase in cash, cash equivalents and restricted cash	(160,813)	11,217
Cash, cash equivalents and restricted cash at beginning of period	625,781	581,150
Cash, cash equivalents and restricted cash at end of period	464,968	592,367
Cash paid for—
Interest (net of amounts capitalized)	120,826	112,365
Supplemental disclosure of non-cash investing and financing activities:
Change in asset retirement obligations	87,509	0
Accrued property additions at end of period	92,532	64,476
Bond purchase fund included in cash, cash equivalents and restricted cash at end of period	$ 0	$ 30,975