Quarterly report [Sections 13 or 15(d)]

IMPACT OF ACCOUNTING METHOD CHANGE FOR INVESTMENT TAX CREDITS - Statements of Cash Flows Line Items Impacted by Change (Details)

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IMPACT OF ACCOUNTING METHOD CHANGE FOR INVESTMENT TAX CREDITS - Statements of Cash Flows Line Items Impacted by Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2026
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Net income   $ 46,802 $ 17,423 $ (16,455) $ 87,433 $ 77,283 $ 52,782 $ (31,712) $ 968 $ 21,069 $ 47,770 $ 98,353 $ 185,787
Adjustments to reconcile net income to net cash flows from operating activities:                          
Depreciation of energy assets, net   24,902   31,026   28,115   24,871 62,905 50,898 87,807 79,013  
Deferred income taxes, net       (2,650)       25,265 (3,584) (18,132) (16,694) (80,496)  
Proceeds from sale of investment tax credits $ 20,411     0       0 20,411 70,788 20,411 70,788  
Prepaid expenses and other current assets                     (14,510) 32,695  
Cash flows from operating activities       35,396       (28,304) (51,402) 15,611 (60,251) 33,323  
Proceeds from sale of transferrable tax credits       0       0 0 0 0 0  
Cash flows from investing activities                     (358,693) (329,070)  
Net increase in cash, cash equivalents, and restricted cash       186,515       (31,605) 64,085 (6,361) 54,394 17,218  
Original Amount | Change In Accounting Principle, Investment Tax Credits for Energy Assets                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Net income   65,598 19,907 (14,383) 24,922 21,840 15,518 (5,606) 5,524 9,912 71,122 31,753 56,675
Adjustments to reconcile net income to net cash flows from operating activities:                          
Depreciation of energy assets, net       28,199       22,842 57,251 46,839 79,326 72,925  
Deferred income taxes, net       (1,895)       1,188 (2,486) (2,916) (31,565) (7,808)  
Proceeds from sale of investment tax credits       0       0 0 0 (412) 0  
Cash flows from operating activities       35,396       (28,304) (71,813) (55,177) (81,074) (37,465)  
Proceeds from sale of transferrable tax credits       0       0 20,411 70,788 20,823 70,788  
Net increase in cash, cash equivalents, and restricted cash       186,515       (31,605) 64,085 (6,361) 54,394 17,218  
Effect of Change | Change In Accounting Principle, Investment Tax Credits for Energy Assets                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Net income   $ (18,796) $ (2,484) (2,072) $ 62,511 $ 55,444 $ 37,264 (26,106) (4,556) 11,157 (23,352) 66,600 $ 129,112
Adjustments to reconcile net income to net cash flows from operating activities:                          
Depreciation of energy assets, net       2,827       2,029 5,654 4,059 8,481 6,088  
Deferred income taxes, net       (755)       24,077 (1,098) (15,216) 14,871 (72,688)  
Proceeds from sale of investment tax credits       0       0 20,411 70,788 20,823 70,788  
Cash flows from operating activities       0       0 20,411 70,788 20,823 70,788  
Proceeds from sale of transferrable tax credits       0       0 (20,411) (70,788) (20,823) (70,788)  
Net increase in cash, cash equivalents, and restricted cash       $ 0       $ 0 $ 0 $ 0 $ 0 $ 0