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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net margin $ 39,103 $ 49,366
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 199,649 189,831
Accretion cost 27,722 26,626
Amortization of deferred gains (894) (894)
Allowance for equity funds used during construction (138) (251)
Deferred outage costs (16,581) (27,507)
Gain on sale of investments (10,284) (11,694)
Regulatory deferral of costs associated with nuclear decommissioning (7,626) (5,427)
Other (698) (1,514)
Change in operating assets and liabilities:    
Receivables (31,535) (119,414)
Inventories 13,759 (4,003)
Prepayments and other current assets 5,349 (17,423)
Accounts payable (32,833) (42,619)
Accrued interest 1,619 (1,032)
Accrued taxes (8,147) 22,469
Other current liabilities (8,928) (15,345)
Member power bill prepayments (19,182) (26,431)
Rate management program collections 78,524 81,105
Total adjustments 189,776 46,477
Net cash provided by operating activities 228,879 95,843
Cash flows from investing activities:    
Property additions (603,062) (659,913)
Activity in nuclear decommissioning trust fund—Purchases (374,059) (261,327)
Activity in nuclear decommissioning trust fund - Proceeds 370,145 257,176
Decrease (increase) in restricted investments 109,302 (13,349)
Activity in other long-term investments—Purchases (227,706) (180,340)
Activity in other long-term investments - Proceeds 129,594 110,335
Other 8,663 11,880
Net cash used in investing activities (587,123) (735,538)
Cash flows from financing activities:    
Long-term debt proceeds 503,431 1,377,089
Long-term debt payments (123,520) (1,000,543)
Increase in short-term borrowings, net 206,467 193,620
Other 11,511 (7,229)
Net cash provided by financing activities 597,889 562,937
Net increase (decrease) in cash and cash equivalents 239,645 (76,758)
Cash and cash equivalents at beginning of period 405,511 448,612
Cash and cash equivalents at end of period 645,156 371,854
Cash paid for—    
Interest (net of amounts capitalized) 96,832 101,711
Supplemental disclosure of non-cash investing and financing activities:    
Change in asset retirement obligations (399) 0
Accrued property additions at end of period 70,537 112,213
Bond purchase fund included in cash and cash equivalents at end of period $ 245,605 $ 0