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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net margin $ 66,290 $ 42,824
Adjustments to reconcile net margin to net cash provided by operating activities:    
Depreciation and amortization, including nuclear fuel 279,830 196,729
Accretion cost 36,039 32,230
Amortization of deferred gains (894) (894)
Allowance for equity funds used during construction (763) (307)
Deferred outage costs (14,385) (22,985)
Gain on sale of investments (12,996) (9,989)
Regulatory deferral of costs associated with nuclear decommissioning 1,368 (5,371)
Other (25,989) (723)
Change in operating assets and liabilities:    
Receivables (45,037) 34,021
Inventories 11,573 (23,876)
Prepayments and other current assets (9,517) (5,886)
Accounts payable (19,949) (98,977)
Accrued interest (3,671) (22,699)
Accrued taxes (15,711) (19,844)
Other current liabilities (6,174) (55,884)
Rate management program billing credits applied (66,056) (25,185)
Other 9,809 (13,018)
Total adjustments 117,477 (42,658)
Net cash provided by operating activities 183,767 166
Cash flows from investing activities:    
Property additions (328,264) (495,134)
Plant acquisition (73,153) (16,743)
Activity in nuclear decommissioning trust fund—Purchases (713,412) (217,394)
Activity in nuclear decommissioning trust fund—Proceeds 705,264 213,108
Decrease in restricted investments 0 74,031
Activity in long-term and short-term investments—Purchases (125,105) (95,750)
Activity in other long-term investments—Proceeds 194,546 98,756
Other (1,419) 20,100
Net cash used in investing activities (341,543) (419,026)
Cash flows from financing activities:    
Long-term debt proceeds 362,442 38,401
Long-term debt payments (207,124) (213,972)
(Decrease) increase in short-term borrowings, net (134,585) 409,237
Other (39,725) 24,381
Net cash (used in) provided by financing activities (18,992) 258,047
Net decrease in cash, cash equivalents and restricted cash (176,768) (160,813)
Cash, cash equivalents and restricted cash at beginning of period 490,592 625,781
Cash, cash equivalents and restricted cash at end of period 313,824 464,968
Cash paid for—    
Interest (net of amounts capitalized) 214,945 120,826
Supplemental disclosure of non-cash investing and financing activities:    
Change in asset retirement obligations 65,149 87,509
Accrued property additions at end of period $ 22,693 $ 92,532