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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net margin $ 54,461 $ 51,199 $ 51,277
Adjustments to reconcile net margin to net cash provided by operating activities:      
Depreciation and amortization, including nuclear fuel 377,853 371,234 374,411
Accretion cost 50,473 38,090 36,674
Amortization of deferred gains (1,788) (1,788) (1,788)
Allowance for equity funds used during construction (771) (1,006) (784)
Deferred outage costs (34,505) (31,863) (40,644)
(Gain) loss on sale of investments (6,058) 4,871 (18,614)
Regulatory deferral of costs associated with nuclear decommissioning (23,982) (26,511) (2,605)
Other (1,097) (5,676) (9,240)
Change in operating assets and liabilities:      
Receivables 24,251 8,424 (1,182)
Inventories (18,597) 5,487 (6,388)
Prepayments and other current assets (1,992) 4,544 614
Accounts payable (27,668) 1,360 129,187
Accrued interest 4,924 (18,539) (14,124)
Accrued and withheld taxes 2,943 (21,351) (1,531)
Other current liabilities (24,069) 25,723 (8,646)
Member power bill prepayments (68,245) 69,921 (15,317)
Other 45,228 15,578 0
Total adjustments 296,900 438,498 420,023
Net cash provided by operating activities 351,361 489,697 471,300
Cash flows from investing activities:      
Property additions (1,255,188) (1,185,367) (1,019,695)
Guarantee settlement proceeds 0 0 1,104,000
Activity in nuclear decommissioning trust fund – Purchases (374,338) (457,909) (450,113)
Activity in nuclear decommissioning trust fund - Proceeds 365,871 449,895 442,989
Decrease (increase) in restricted investments 119,568 229,751 (414,781)
Activity in other long-term investments – Purchases (251,077) (207,670) (108,704)
Activity in other long-term investments - Proceeds 178,172 176,717 78,356
Other (21,493) 9,144 (43,056)
Net cash used in investing activities (1,238,485) (985,439) (411,004)
Cash flows from financing activities:      
Long-term debt proceeds 1,266,950 813,028 544,503
Long-term debt payments (523,691) (201,354) (677,641)
(Decrease) increase in short-term borrowings, net (154,257) 246,001 88,458
Other (5,884) (7,010) 15,789
Net cash provided by (used in) financing activities 583,118 850,665 (28,891)
Net (decrease) increase in cash and cash equivalents (304,006) 354,923 31,405
Cash and cash equivalents at beginning of period 752,618 397,695 366,290
Cash and cash equivalents at end of period 448,612 752,618 397,695
Cash paid for –      
Interest (net of amounts capitalized) 208,892 245,085 251,186
Supplemental disclosure of non-cash investing and financing activities:      
Change in asset retirement obligations 5,282 248,608 2,414
Accrued property additions at end of period 94,492 121,557 134,082
Interest paid-in-kind $ 67,028 $ 59,137 $ 57,144