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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net margin $ 23,596 $ 27,400
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 93,497 91,608
Accretion cost 9,888 9,320
Amortization of deferred gains (447) (447)
Allowance for equity funds used during construction (254) (209)
Deferred outage costs (20,803) (11,331)
(Gain) loss on sale of investments (791) 1,290
Regulatory deferral of costs associated with nuclear decommissioning (6,728) (6,835)
Other 2,155 (1,394)
Change in operating assets and liabilities:    
Receivables (9,938) 30,958
Inventories (9,204) (5,406)
Prepayments and other current assets (4,794) 1,646
Accounts payable (57,900) (55,431)
Accrued interest 28,434 (1,058)
Accrued taxes 12,156 (10,338)
Other current liabilities (26,280) (4,126)
Member power bill prepayments (41,544) 8,661
Other 11,806  
Total adjustments (20,747) 46,908
Net cash provided by operating activities 2,849 74,308
Cash flows from investing activities:    
Property additions (321,093) (285,374)
Activity in nuclear decommissioning trust fund - Purchases (80,733) (122,330)
Activity in nuclear decommissioning trust fund - Proceeds 78,628 120,409
(Increase) decrease in restricted investments (8,053) 29,829
Activity in other long-term investments - Purchases (44,990) (43,844)
Activity in other long-term investments - Proceeds 39,553 38,063
Other (5,618) 8,167
Net cash used in investing activities (342,306) (255,080)
Cash flows from financing activities:    
Long-term debt proceeds 632,940 2,636
Long-term debt payments (350,254) (39,350)
(Decrease) increase in short-term borrowings, net (338,476) 68,171
Other (15,973) 730
Net cash (used in) provided by financing activities (71,763) 32,187
Net decrease in cash and cash equivalents (411,220) (148,585)
Cash and cash equivalents at beginning of period 752,618 397,695
Cash and cash equivalents at end of period 341,398 249,110
Cash paid for -    
Interest (net of amounts capitalized) 29,222 55,772
Supplemental disclosure of non-cash investing and financing activities:    
Accrued property additions at end of period 115,332 133,318
Interest paid-in-kind $ 15,710 $ 14,393