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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net margin $ 55,895 $ 54,461 $ 51,199
Adjustments to reconcile net margin to net cash provided by operating activities:      
Depreciation and amortization, including nuclear fuel 376,639 377,853 371,234
Accretion cost 54,475 50,473 38,090
Amortization of deferred gains (1,789) (1,788) (1,788)
Allowance for equity funds used during construction (374) (771) (1,006)
Deferred outage costs (38,278) (34,505) (31,863)
(Gain) loss on sale of investments (19,779) (6,058) 4,871
Regulatory deferral of costs associated with nuclear decommissioning (10,691) (23,982) (26,511)
Other (5,587) (1,097) (5,676)
Change in operating assets and liabilities:      
Receivables (3,659) 24,251 8,424
Inventories (2,409) (18,597) 5,487
Prepayments and other current assets (23,754) (1,992) 4,544
Accounts payable 1,504 (27,668) 1,360
Accrued interest 6,539 4,924 (18,539)
Accrued and withheld taxes 33,588 2,943 (21,351)
Other current liabilities 9,439 (24,069) 25,723
Member power bill prepayments (67,281) (68,245) 69,921
Rate management program collections 146,917 45,228 15,578
Total adjustments 455,500 296,900 438,498
Net cash provided by operating activities 511,395 351,361 489,697
Cash flows from investing activities:      
Property additions (1,335,380) (1,255,188) (1,185,367)
Activity in nuclear decommissioning trust fund – Purchases (578,610) (374,338) (457,909)
Activity in nuclear decommissioning trust fund - Proceeds 570,294 365,871 449,895
Decrease in restricted investments 46,003 119,568 229,751
Activity in other long-term investments – Purchases (425,628) (251,077) (207,670)
Activity in other long-term investments - Proceeds 186,219 178,172 176,717
Other 7,982 (21,493) 9,144
Net cash used in investing activities (1,529,120) (1,238,485) (985,439)
Cash flows from financing activities:      
Long-term debt proceeds 2,221,685 1,266,950 813,028
Long-term debt payments (1,334,368) (523,691) (201,354)
Increase (decrease) in short-term borrowings, net 101,128 (154,257) 246,001
Other (13,821) (5,884) (7,010)
Net cash provided by financing activities 974,624 583,118 850,665
Net (decrease) increase in cash and cash equivalents (43,101) (304,006) 354,923
Cash and cash equivalents at beginning of period 448,612 752,618 397,695
Cash and cash equivalents at end of period 405,511 448,612 752,618
Cash paid for –      
Interest (net of amounts capitalized) 193,063 208,892 245,085
Supplemental disclosure of non-cash investing and financing activities:      
Change in asset retirement obligations 18,709 5,282 248,608
Accrued property additions at end of period 89,640 94,492 121,557
Interest paid-in-kind $ 0 $ 67,028 $ 59,137