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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Variable Interest Entity Financial Information (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 94,551 |  | $ 108,516 |  |  |
Restricted cash | [1] | 98,504 |  | 69,706 |  |  |
Accounts receivable, net |  | 253,793 | [1] | 256,961 | [1] | $ 230,298 | $ 153,362
Unbilled revenue |  | 691,316 | [1] | 644,105 | [1] | 572,804 | 636,163
Prepaid expenses and other current assets |  | 14,204 |  | 11,997 |  |  |
Income taxes receivable |  | 3,603 |  | 1,685 |  |  |
Total current assets | [1] | 1,420,496 |  | 1,301,134 |  |  |
Energy assets, net | [1] | 2,117,460 |  | 1,915,311 |  |  |
Deferred income tax assets, net |  | 76,348 |  | 56,523 |  |  |
Intangible assets, net |  | 8,109 |  | 8,814 |  |  |
Right-of-use assets, net | [1] | 76,371 |  | 80,149 |  |  |
Restricted cash, non-current portion | [1] | 22,541 |  | 20,156 |  |  |
Other assets | [1] | 109,666 |  | 89,948 |  |  |
Total assets | [1] | 4,426,410 |  | 4,158,508 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities | [1] | 167,083 |  | 149,363 |  |  |
Accounts payable | [1] | 569,600 |  | 529,338 |  |  |
Accrued expenses and other current liabilities | [1] | 105,829 |  | 107,293 |  |  |
Current portions of operating lease liabilities | [1] | 8,062 |  | 10,536 |  |  |
Deferred revenue |  | 87,297 |  | 91,734 |  | $ 108,020 | $ 52,903
Income taxes payable |  | 1,428 |  | 744 |  |  |
Total current liabilities | [1] | 939,299 |  | 889,008 |  |  |
Long-term operating lease liabilities, net of current portion | [1] | 56,032 |  | 59,479 |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 12,880 |  | 8,780 |  |  |
Restricted cash |  | 17,028 |  | 0 |  |  |
Accounts receivable, net |  | 25,739 |  | 14,607 |  |  |
Unbilled revenue |  | 103,025 |  | 4,270 |  |  |
Prepaid expenses and other current assets |  | 6,781 |  | 7,118 |  |  |
Income taxes receivable |  | 2,729 |  | 672 |  |  |
Total current assets |  | 168,182 |  | 35,447 |  |  |
Energy assets, net |  | 112,605 |  | 122,414 |  |  |
Deferred income tax assets, net |  | 2,349 |  | 0 |  |  |
Intangible assets, net |  | 0 |  | 20 |  |  |
Right-of-use assets, net |  | 461 |  | 471 |  |  |
Restricted cash, non-current portion |  | 1,747 |  | 0 |  |  |
Other assets |  | 105 |  | 196 |  |  |
Total assets |  | 285,449 |  | 158,548 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 32,143 |  | 0 |  |  |
Accounts payable |  | 86,138 |  | 5,167 |  |  |
Accrued expenses and other current liabilities |  | 8,376 |  | 602 |  |  |
Current portions of operating lease liabilities |  | 13 |  | 13 |  |  |
Deferred revenue |  | 18,564 |  | 10,063 |  |  |
Income taxes payable |  | 369 |  | 526 |  |  |
Total current liabilities |  | 145,603 |  | 16,371 |  |  |
Long-term operating lease liabilities, net of current portion |  | 479 |  | 500 |  |  |
Total VIE liabilities |  | 146,082 |  | 16,871 |  |  |
Variable Interest Entity, Primary Beneficiary | Investment Funds |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 32 |  | 89 |  |  |
Restricted cash |  | 0 |  | 0 |  |  |
Accounts receivable, net |  | 471 |  | 0 |  |  |
Unbilled revenue |  | 0 |  | 230 |  |  |
Prepaid expenses and other current assets |  | 0 |  | 30 |  |  |
Income taxes receivable |  | 0 |  | 0 |  |  |
Total current assets |  | 503 |  | 349 |  |  |
Energy assets, net |  | 22,390 |  | 23,538 |  |  |
Deferred income tax assets, net |  | 0 |  | 0 |  |  |
Intangible assets, net |  | 0 |  | 0 |  |  |
Right-of-use assets, net |  | 461 |  | 471 |  |  |
Restricted cash, non-current portion |  | 0 |  | 0 |  |  |
Other assets |  | 0 |  | 0 |  |  |
Total assets |  | 23,354 |  | 24,358 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 0 |  | 0 |  |  |
Accounts payable |  | 68 |  | 27 |  |  |
Accrued expenses and other current liabilities |  | 20 |  | 25 |  |  |
Current portions of operating lease liabilities |  | 13 |  | 13 |  |  |
Deferred revenue |  | 0 |  | 0 |  |  |
Income taxes payable |  | 0 |  | 0 |  |  |
Total current liabilities |  | 101 |  | 65 |  |  |
Long-term operating lease liabilities, net of current portion |  | 479 |  | 500 |  |  |
Total VIE liabilities |  | 580 |  | 565 |  |  |
Variable Interest Entity, Primary Beneficiary | Other VIEs |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 12,848 |  | 8,691 |  |  |
Restricted cash |  | 17,028 |  | 0 |  |  |
Accounts receivable, net |  | 25,268 |  | 14,607 |  |  |
Unbilled revenue |  | 103,025 |  | 4,040 |  |  |
Prepaid expenses and other current assets |  | 6,781 |  | 7,088 |  |  |
Income taxes receivable |  | 2,729 |  | 672 |  |  |
Total current assets |  | 167,679 |  | 35,098 |  |  |
Energy assets, net |  | 90,215 |  | 98,876 |  |  |
Deferred income tax assets, net |  | 2,349 |  | 0 |  |  |
Intangible assets, net |  | 0 |  | 20 |  |  |
Right-of-use assets, net |  | 0 |  | 0 |  |  |
Restricted cash, non-current portion |  | 1,747 |  | 0 |  |  |
Other assets |  | 105 |  | 196 |  |  |
Total assets |  | 262,095 |  | 134,190 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 32,143 |  | 0 |  |  |
Accounts payable |  | 86,070 |  | 5,140 |  |  |
Accrued expenses and other current liabilities |  | 8,356 |  | 577 |  |  |
Current portions of operating lease liabilities |  | 0 |  | 0 |  |  |
Deferred revenue |  | 18,564 |  | 10,063 |  |  |
Income taxes payable |  | 369 |  | 526 |  |  |
Total current liabilities |  | 145,502 |  | 16,306 |  |  |
Long-term operating lease liabilities, net of current portion |  | 0 |  | 0 |  |  |
Total VIE liabilities |  | $ 145,502 |  | $ 16,306 |  |  |
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at September 30, 2025 and December 31, 2024 of $285,449 and $158,548, respectively. Includes liabilities of consolidated VIEs at September 30, 2025 and December 31, 2024 of $146,082 and $16,871, respectively. See Note 13.

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