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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net margin $ 25,958 $ 23,204
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 99,638 93,205
Accretion cost 13,781 13,235
Amortization of deferred gains (447) (447)
Allowance for equity funds used during construction (26) (155)
Deferred outage costs (13,231) (25,171)
Gain on sale of investments (9,134) (8,368)
Regulatory deferral of costs associated with nuclear decommissioning 284 150
Other (641) (729)
Change in operating assets and liabilities:    
Receivables 1,455 29,378
Inventories 8,567 (11,302)
Prepayments and other current assets 4,039 1,296
Accounts payable (41,415) (62,430)
Accrued interest 4,300 11,883
Accrued taxes (22,542) 9,332
Other current liabilities (6,273) (10,942)
Member power bill prepayments (18,779) (192)
Rate management program collections 37,979 21,929
Total adjustments 57,555 60,672
Net cash provided by operating activities 83,513 83,876
Cash flows from investing activities:    
Property additions (324,181) (361,580)
Activity in nuclear decommissioning trust fund—Purchases (250,195) (146,379)
Activity in nuclear decommissioning trust fund - Proceeds 248,147 144,227
Bond purchase fund 0 (212,760)
Decrease (increase) in restricted investments 54,280 (6,633)
Activity in other long-term investments—Purchases (120,752) (114,725)
Activity in other long-term investments - Proceeds 72,293 53,057
Other 144 4,745
Net cash used in investing activities (320,264) (640,048)
Cash flows from financing activities:    
Long-term debt proceeds 238,578 411,318
Long-term debt payments (61,828) (52,041)
Increase in short-term borrowings, net 217,674 119,533
Other (2,083) (11,169)
Net cash provided by financing activities 392,341 467,641
Net increase (decrease) in cash and cash equivalents 155,590 (88,531)
Cash and cash equivalents at beginning of period 405,511 448,612
Cash and cash equivalents at end of period 561,101 360,081
Cash paid for—    
Interest (net of amounts capitalized) 45,127 38,986
Supplemental disclosure of non-cash investing and financing activities:    
Change in asset retirement obligations (399) 0
Accrued property additions at end of period $ 76,364 $ 87,186