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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Variable Interest Entity Financial Information (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
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Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 113,502 |  | $ 79,271 |  |  |
Accounts receivable, net |  | 230,298 | [1] | 153,362 | [1] | $ 133,070 | $ 174,009
Costs and estimated earnings in excess of billings |  | 572,804 | [1] | 636,163 | [1] | 591,378 | 576,363
Prepaid expenses and other current assets |  | 12,465 |  | 10,697 |  |  |
Income taxes receivable |  | 4,468 |  | 5,775 |  |  |
Project development costs, net |  | 20,819 |  | 20,735 |  |  |
Total current assets | [1] | 1,224,551 |  | 1,128,471 |  |  |
Property and equipment, net | [1] | 16,777 |  | 17,395 |  |  |
Energy assets, net | [1] | 1,882,588 |  | 1,689,424 |  |  |
Intangible assets net |  | 5,387 |  | 6,808 |  |  |
Operating lease assets | [1] | 77,609 |  | 58,586 |  |  |
Restricted cash, non-current portion | [1] | 19,021 |  | 12,094 |  |  |
Other assets | [1] | 77,812 |  | 89,735 |  |  |
Total assets | [1] | 3,982,238 |  | 3,713,776 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities | [1] | 343,247 |  | 322,247 |  |  |
Accounts payable | [1] | 399,244 |  | 402,752 |  |  |
Accrued expenses and other current liabilities | [1] | 101,259 |  | 108,831 |  |  |
Current portions of operating lease liabilities | [1] | 12,242 |  | 13,569 |  |  |
Billings in excess of cost and estimated earnings |  | 108,020 |  | 52,903 |  | $ 36,880 | $ 34,796
Income Taxes Payable |  | 655 |  | 1,169 |  |  |
Total current liabilities | [1] | 964,667 |  | 901,471 |  |  |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | [1] | 1,317,517 |  | 1,170,075 |  |  |
Long-term operating lease liabilities, net of current portion | [1] | 58,007 |  | 42,258 |  |  |
Other liabilities | [1] | 102,645 |  | 82,714 |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 11,395 |  | 21,879 |  |  |
Accounts receivable, net |  | 13,760 |  | 1,977 |  |  |
Costs and estimated earnings in excess of billings |  | 2,699 |  | 14,071 |  |  |
Prepaid expenses and other current assets |  | 1,889 |  | 3,782 |  |  |
Income taxes receivable |  | 625 |  | 0 |  |  |
Project development costs, net |  | 14,244 |  | 0 |  |  |
Total current assets |  | 44,612 |  | 41,709 |  |  |
Property and equipment, net |  | 0 |  | 267 |  |  |
Energy assets, net |  | 165,529 |  | 252,912 |  |  |
Intangible assets net |  | 26 |  | 0 |  |  |
Operating lease assets |  | 4,627 |  | 17,656 |  |  |
Restricted cash, non-current portion |  | 73 |  | 73 |  |  |
Other assets |  | 102 |  | 84 |  |  |
Total assets |  | 214,969 |  | 312,701 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 2,200 |  | 134,617 |  |  |
Accounts payable |  | 8,753 |  | 7,930 |  |  |
Accrued expenses and other current liabilities |  | 1,757 |  | 19,868 |  |  |
Current portions of operating lease liabilities |  | 146 |  | 7,086 |  |  |
Billings in excess of cost and estimated earnings |  | 12,719 |  | 3,153 |  |  |
Income Taxes Payable |  | 262 |  | 0 |  |  |
Total current liabilities |  | 25,837 |  | 172,654 |  |  |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs |  | 16,028 |  | 17,167 |  |  |
Long-term operating lease liabilities, net of current portion |  | 5,002 |  | 8,886 |  |  |
Other liabilities |  | 392 |  | 356 |  |  |
Total VIE liabilities |  | 47,259 |  | 199,063 |  |  |
Variable Interest Entity, Primary Beneficiary | Investment Funds |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 1,328 |  | 5,099 |  |  |
Accounts receivable, net |  | 0 |  | 0 |  |  |
Costs and estimated earnings in excess of billings |  | 2,699 |  | 662 |  |  |
Prepaid expenses and other current assets |  | 30 |  | 33 |  |  |
Income taxes receivable |  | 0 |  | 0 |  |  |
Project development costs, net |  | 0 |  | 0 |  |  |
Total current assets |  | 4,057 |  | 5,794 |  |  |
Property and equipment, net |  | 0 |  | 0 |  |  |
Energy assets, net |  | 75,985 |  | 79,104 |  |  |
Intangible assets net |  | 0 |  | 0 |  |  |
Operating lease assets |  | 4,627 |  | 4,748 |  |  |
Restricted cash, non-current portion |  | 73 |  | 73 |  |  |
Other assets |  | 0 |  | 10 |  |  |
Total assets |  | 84,742 |  | 89,729 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 2,200 |  | 2,190 |  |  |
Accounts payable |  | 1,350 |  | 1,440 |  |  |
Accrued expenses and other current liabilities |  | 208 |  | 241 |  |  |
Current portions of operating lease liabilities |  | 146 |  | 133 |  |  |
Billings in excess of cost and estimated earnings |  | 0 |  | 0 |  |  |
Income Taxes Payable |  | 0 |  | 0 |  |  |
Total current liabilities |  | 3,904 |  | 4,004 |  |  |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs |  | 16,028 |  | 17,167 |  |  |
Long-term operating lease liabilities, net of current portion |  | 5,002 |  | 5,063 |  |  |
Other liabilities |  | 392 |  | 356 |  |  |
Total VIE liabilities |  | 25,326 |  | 26,590 |  |  |
Variable Interest Entity, Primary Beneficiary | Other VIEs |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 10,067 |  | 16,780 |  |  |
Accounts receivable, net |  | 13,760 |  | 1,977 |  |  |
Costs and estimated earnings in excess of billings |  | 0 |  | 13,409 |  |  |
Prepaid expenses and other current assets |  | 1,859 |  | 3,749 |  |  |
Income taxes receivable |  | 625 |  | 0 |  |  |
Project development costs, net |  | 14,244 |  | 0 |  |  |
Total current assets |  | 40,555 |  | 35,915 |  |  |
Property and equipment, net |  | 0 |  | 267 |  |  |
Energy assets, net |  | 89,544 |  | 173,808 |  |  |
Intangible assets net |  | 26 |  | 0 |  |  |
Operating lease assets |  | 0 |  | 12,908 |  |  |
Restricted cash, non-current portion |  | 0 |  | 0 |  |  |
Other assets |  | 102 |  | 74 |  |  |
Total assets |  | 130,227 |  | 222,972 |  |  |
Current liabilities: |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities |  | 0 |  | 132,427 |  |  |
Accounts payable |  | 7,403 |  | 6,490 |  |  |
Accrued expenses and other current liabilities |  | 1,549 |  | 19,627 |  |  |
Current portions of operating lease liabilities |  | 0 |  | 6,953 |  |  |
Billings in excess of cost and estimated earnings |  | 12,719 |  | 3,153 |  |  |
Income Taxes Payable |  | 262 |  | 0 |  |  |
Total current liabilities |  | 21,933 |  | 168,650 |  |  |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs |  | 0 |  | 0 |  |  |
Long-term operating lease liabilities, net of current portion |  | 0 |  | 3,823 |  |  |
Other liabilities |  | 0 |  | 0 |  |  |
Total VIE liabilities |  | $ 21,933 |  | $ 172,473 |  |  |
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at September 30, 2024 and December 31, 2023 of $214,969 and $312,701, respectively. Includes liabilities of consolidated VIEs at September 30, 2024 and December 31, 2023 of $47,259 and $199,063, respectively. See Note 13.

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