Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net margin	$ 72,244	$ 48,010
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization, including nuclear fuel	333,245	297,976
Accretion cost	41,410	41,839
Amortization of deferred gains	(1,341)	(1,341)
Allowance for equity funds used during construction	(460)	(267)
Deferred outage costs	(26,712)	(27,163)
Loss (gain) on sale of investments	21,077	(11,665)
Regulatory deferral of costs associated with nuclear decommissioning	(45,229)	(15,592)
Other	2,352	(639)
Change in operating assets and liabilities:
Receivables	(84,191)	(51,283)
Inventories	(10,312)	46,686
Prepayments and other current assets	8,859	(6,199)
Accounts payable	29,464	(4,487)
Accrued interest	(6,565)	5,842
Accrued taxes	51,394	6,788
Other current liabilities	47,369	522
Member power bill prepayments	(12,847)	(31,482)
Rate management program collections, net	16,904	117,600
Total adjustments	364,417	367,135
Net cash provided by operating activities	436,661	415,145
Cash flows from investing activities:
Property additions	(872,551)	(891,162)
Plant acquisition	0	(233,156)
Activity in nuclear decommissioning trust fund—Purchases	(201,721)	(556,879)
Activity in nuclear decommissioning trust fund - Proceeds	196,136	550,956
Decrease in restricted investments	246,427	167,607
Activity in other long-term investments—Purchases	(144,843)	(340,877)
Activity in other long-term investments - Proceeds	103,024	184,083
Other	5,569	8,139
Net cash used in investing activities	(667,959)	(1,111,289)
Cash flows from financing activities:
Long-term debt proceeds	803,032	517,524
Long-term debt payments	(365,104)	(440,548)
(Decrease) increase in short-term borrowings, net	(171,310)	639,876
Other	23,958	30,124
Net cash provided by financing activities	290,576	746,976
Net increase in cash, cash equivalents and restricted cash	59,278	50,832
Cash, cash equivalents and restricted cash at beginning of period	581,150	405,511
Cash, cash equivalents and restricted cash at end of period	640,428	456,343
Cash paid for—
Interest (net of amounts capitalized)	150,208	141,206
Supplemental disclosure of non-cash investing and financing activities:
Change in asset retirement obligations	66,716	42,964
Accrued property additions at end of period	$ 45,926	$ 71,443