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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net margin $ 24,410 $ 21,980
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 66,365 92,211
Accretion cost 15,508 13,532
Amortization of deferred gains (447) (447)
Allowance for equity funds used during construction (149) (135)
Deferred outage costs (21,198) (22,228)
Loss on sale of investments 1,289 8,271
Regulatory deferral of costs associated with nuclear decommissioning (8,519) (14,694)
Other (863) 974
Change in operating assets and liabilities:    
Receivables 49,887 (8,620)
Inventories (17,711) (715)
Prepayments and other current assets 4,027 5,954
Accounts payable (116,354) (78,836)
Accrued interest (13,109) (18,662)
Accrued taxes (36,722) 16,180
Other current liabilities (26,841) 29,836
Member power bill prepayments (989) (7,988)
Rate management program collections, net (9,494) 11,017
Total adjustments (115,320) 25,650
Net cash (used in) provided by operating activities (90,910) 47,630
Cash flows from investing activities:    
Property additions (259,123) (280,364)
Activity in nuclear decommissioning trust fund—Purchases (2,500) (195,038)
Activity in nuclear decommissioning trust fund - Proceeds 283 192,858
Decrease in restricted investments 74,031 123,232
Activity in other long-term investments—Purchases (63,505) (111,490)
Activity in other long-term investments - Proceeds 68,226 94,279
Other 8,153 (3,718)
Net cash used in investing activities (174,435) (180,241)
Cash flows from financing activities:    
Long-term debt proceeds 15,431 102,185
Long-term debt payments (137,732) (115,168)
Increase in short-term borrowings, net 157,375 60,501
Other 11,311 10,496
Net cash provided by financing activities 46,385 58,014
Net decrease in cash, cash equivalents and restricted cash (218,960) (74,597)
Cash, cash equivalents and restricted cash at beginning of period 625,781 581,150
Cash, cash equivalents and restricted cash at end of period 406,821 506,553
Cash paid for—    
Interest (net of amounts capitalized) 61,915 66,117
Supplemental disclosure of non-cash investing and financing activities:    
Change in asset retirement obligations 87,509 0
Accrued property additions at end of period $ 69,557 $ 21,469