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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net margin $ 49,366 $ 32,979
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 189,831 185,318
Accretion cost 26,626 23,033
Amortization of deferred gains (894) (894)
Allowance for equity funds used during construction (251) (427)
Deferred outage costs (27,507) (22,470)
Gain on sale of investments (11,694) (2,346)
Regulatory deferral of costs associated with nuclear decommissioning (5,427) (12,764)
Other (1,514) 1,282
Change in operating assets and liabilities:    
Receivables (119,414) (32,090)
Inventories (4,003) (15,246)
Prepayments and other current assets (17,423) (4,564)
Accounts payable (42,619) (50,361)
Accrued interest (1,032) 24,601
Accrued taxes 22,469 22,916
Other current liabilities (15,345) (26,402)
Member power bill prepayments (26,431) (78,297)
Rate management program collections 81,105 23,680
Total adjustments 46,477 34,969
Net cash provided by operating activities 95,843 67,948
Cash flows from investing activities:    
Property additions (659,913) (581,140)
Activity in nuclear decommissioning trust fund—Purchases (261,327) (180,121)
Activity in nuclear decommissioning trust fund - Proceeds 257,176 176,037
Increase (decrease) in restricted investments (13,349) 21,667
Activity in other long-term investments—Purchases (180,340) (100,502)
Activity in other long-term investments - Proceeds 110,335 88,085
Other 11,880 (2,940)
Net cash used in investing activities (735,538) (578,914)
Cash flows from financing activities:    
Long-term debt proceeds 1,377,089 657,986
Long-term debt payments (1,000,543) (391,206)
Increase (decrease) in short-term borrowings, net 193,620 (82,162)
Other (7,229) (15,714)
Net cash provided by financing activities 562,937 168,904
Net decrease in cash and cash equivalents (76,758) (342,062)
Cash and cash equivalents at beginning of period 448,612 752,618
Cash and cash equivalents at end of period 371,854 410,556
Cash paid for—    
Interest (net of amounts capitalized) 101,711 85,512
Supplemental disclosure of non-cash investing and financing activities:    
Change in asset retirement obligations 0 4,830
Accrued property additions at end of period 112,213 108,258
Interest paid-in-kind $ 0 $ 35,549