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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |  |
Cash and cash equivalents | [1] | $ 58,807 | $ 66,422
Restricted cash | [1] | 23,672 | 22,063
Accounts receivable, net of allowance of $2,311 and $2,266, respectively | [1] | 115,462 | 125,010
Accounts receivable retainage, net |  | 36,485 | 30,189
Costs and estimated earnings in excess of billings | [1] | 195,027 | 185,960
Inventory, net |  | 8,798 | 8,575
Prepaid expenses and other current assets | [1] | 25,389 | 26,854
Income tax receivable |  | 5,688 | 9,803
Project development costs |  | 14,508 | 15,839
Total current assets | [1] | 483,836 | 490,715
Federal ESPC receivable |  | 512,737 | 396,725
Property and equipment, net | [1] | 8,826 | 8,982
Energy assets, net | [1] | 798,609 | 729,378
Deferred income tax assets, net |  | 3,972 | 3,864
Goodwill, net |  | 58,901 | 58,714
Intangible assets, net |  | 769 | 927
Operating lease assets | [1] | 40,608 | 39,151
Restricted cash, non-current portion | [1] | 11,363 | 10,352
Other assets | [1] | 19,069 | 15,307
Total assets | [1] | 1,938,690 | 1,754,115
Current liabilities: |  |  |
Current portions of long-term debt and financing lease liabilities | [1] | 79,778 | 69,362
Accounts payable | [1] | 193,373 | 230,916
Accrued expenses and other current liabilities | [1] | 40,108 | 41,748
Current portions of operating lease liabilities | [1] | 5,995 | 6,106
Billings in excess of cost and estimated earnings |  | 26,561 | 33,984
Income taxes payable |  | 0 | 981
Total current liabilities | [1] | 345,815 | 383,097
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | [1] | 305,351 | 311,674
Federal ESPC liabilities |  | 506,680 | 440,223
Deferred income taxes, net |  | 7,159 | 6,227
Deferred grant income |  | 8,075 | 8,271
Long-term operating lease liabilities, net of current portion | [1] | 36,731 | 35,300
Other liabilities | [1] | 37,300 | 37,660
Commitments and contingencies (Note 9) |  |  |
Redeemable non-controlling interests, net |  | 46,003 | 38,850
Stockholders’ equity: |  |  |
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2021 and December 31, 2020 |  | 0 | 0
Additional paid-in capital |  | 270,955 | 145,496
Retained earnings |  | 393,158 | 368,390
Accumulated other comprehensive loss, net |  | (6,754) | (9,290)
Treasury stock, at cost, 2,101,795 shares at June 30, 2021 and December 31, 2020 |  | (11,788) | (11,788)
Total stockholders’ equity |  | 645,576 | 492,813
Total liabilities, redeemable non-controlling interests and stockholders’ equity |  | 1,938,690 | 1,754,115
Class A Common Stock |  |  |
Stockholders’ equity: |  |  |
Common stock |  | 3 | 3
Class B Common Stock |  |  |
Stockholders’ equity: |  |  |
Common stock |  | $ 2 | $ 2
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2021 and December 31, 2020 of $155,878 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at June 30, 2021 and December 31, 2020 of $32,318 and $33,335, respectively. See Note 12.

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