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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net margin $ 23,204 $ 23,596
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 93,205 93,497
Accretion cost 13,235 9,888
Amortization of deferred gains (447) (447)
Allowance for equity funds used during construction (155) (254)
Deferred outage costs (25,171) (20,803)
Gain on sale of investments (8,368) (791)
Regulatory deferral of costs associated with nuclear decommissioning 150 (6,728)
Other (729) 2,155
Change in operating assets and liabilities:    
Receivables 29,378 (9,938)
Inventories (11,302) (9,204)
Prepayments and other current assets 1,296 (4,794)
Accounts payable (62,430) (57,900)
Accrued interest 11,883 28,434
Accrued taxes 9,332 12,156
Other current liabilities (10,942) (26,280)
Member power bill prepayments (192) (41,544)
Rate management program collections 21,929 11,806
Total adjustments 60,672 (20,747)
Net cash provided by operating activities 83,876 2,849
Cash flows from investing activities:    
Property additions (361,580) (321,093)
Activity in nuclear decommissioning trust fund—Purchases (146,379) (80,733)
Activity in nuclear decommissioning trust fund - Proceeds 144,227 78,628
Bond purchase fund (212,760) 0
Increase in restricted investments (6,633) (8,053)
Activity in other long-term investments—Purchases (114,725) (44,990)
Activity in other long-term investments - Proceeds 53,057 39,553
Other 4,745 (5,618)
Net cash used in investing activities (640,048) (342,306)
Cash flows from financing activities:    
Long-term debt proceeds 411,318 632,940
Long-term debt payments (52,041) (350,254)
Increase (decrease) in short-term borrowings, net 119,533 (338,476)
Other (11,169) (15,973)
Net cash provided by (used in) financing activities 467,641 (71,763)
Net decrease in cash and cash equivalents (88,531) (411,220)
Cash and cash equivalents at beginning of period 448,612 752,618
Cash and cash equivalents at end of period 360,081 341,398
Cash paid for—    
Interest (net of amounts capitalized) 38,986 29,222
Supplemental disclosure of non-cash investing and financing activities:    
Accrued property additions at end of period 87,186 115,332
Interest paid-in-kind $ 0 $ 15,710