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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |  |  |
Net income | $ 98,549 |  | $ 80,191 |  | $ 56,922
Adjustments to reconcile net income to net cash flows from operating activities: |  |  |  |  |
Depreciation of energy assets, net | 49,755 |  | 43,113 |  | 38,039
Depreciation of property and equipment | 2,665 |  | 3,143 |  | 3,317
Amortization of debt discount and debt issuance costs | 4,211 |  | 2,849 |  | 2,686
Amortization of intangible assets | 1,858 |  | 321 |  | 685
Net increase in fair value of contingent consideration | 1,614 |  | 0 |  | 0
Accretion of ARO | 146 |  | 123 |  | 93
(Recoveries of) provision for bad debts | (382) |  | 187 |  | 282
Impairment of long-lived assets / loss on disposal | 937 |  | 1,901 |  | 2,696
Gain on sale of equity investments | 0 |  | (575) |  | 0
(Earnings) loss of unconsolidated entities | (1,647) |  | 118 |  | 225
Net (gain) loss from derivatives | (212) |  | 240 |  | (705)
Stock-based compensation expense | 15,046 |  | 8,716 |  | 1,933
Deferred income taxes, net | 3,918 |  | (4,760) |  | 3,401
Unrealized foreign exchange (gain) loss | (123) |  | 142 |  | (306)
Changes in operating assets and liabilities: |  |  |  |  |
Accounts receivable | 3,477 |  | (15,953) |  | (24,178)
Accounts receivable retainage | 4,716 |  | (12,882) |  | (13,113)
Federal ESPC receivable | (259,499) |  | (249,728) |  | (227,078)
Inventory, net | (5,411) |  | (232) |  | 660
Costs and estimated earnings in excess of billings | (272,629) |  | (113,192) |  | 19,474
Prepaid expenses and other current assets | (3,182) |  | 1,770 |  | 517
Project development costs | (685) |  | 1,949 |  | (3,085)
Other assets | (11,327) |  | (1,870) |  | 311
Accounts payable, accrued expenses, and other current liabilities | 36,155 |  | 83,473 |  | 29,047
Billings in excess of cost and estimated earnings | 449 |  | (693) |  | 8,042
Other liabilities | (5,074) |  | (5,036) |  | 1,844
Income taxes payable, net | (1,613) |  | 4,389 |  | (4,292)
Cash flows from operating activities | (338,288) |  | (172,296) |  | (102,583)
Cash flows from investing activities: |  |  |  |  |
Purchases of property and equipment | (5,296) |  | (4,896) |  | (2,211)
Capital investment in energy assets | (304,596) |  | (170,277) |  | (175,650)
Capital investment in major maintenance of energy assets | (18,007) |  | (8,602) |  | (4,896)
Grant award proceeds for energy assets | 0 |  | 774 |  | 1,874
Proceeds from sale of equity investment | 0 |  | 1,672 |  | 0
Acquisitions, net of cash received | 0 |  | (14,928) |  | 0
Contributions to equity investment | 0 |  | (9,000) |  | (132)
Loans to joint venture investments | (459) |  | 0 |  | 0
Cash flows from investing activities | (328,358) |  | (205,257) |  | (181,015)
Cash flows from financing activities: |  |  |  |  |
Proceeds from equity offering, net of offering costs | 0 |  | 120,084 |  | 0
Payments of debt discount and debt issuance costs | (3,695) |  | (2,919) |  | (5,234)
Proceeds from exercises of options and ESPP | 5,963 |  | 6,927 |  | 9,875
Repurchase of common stock | 0 |  | 0 |  | (6)
Proceeds from (payments on) senior secured revolving credit facility, net | 137,900 |  | (8,073) |  | 3,000
Proceeds from long-term debt financings | 468,476 |  | 185,994 |  | 116,067
Proceeds from Federal ESPC projects | 238,360 |  | 159,216 |  | 248,917
Net proceeds for customer energy asset projects | 14,341 |  | 2,033 |  | 1,378
Investment fund call option exercise | (839) |  | (1,000) |  | 0
Contributions from non-controlling interest | 32,706 |  | 0 |  | 0
(Distributions to) proceeds from redeemable non-controlling interests, net | (1,128) |  |  |  |
(Distributions to) proceeds from redeemable non-controlling interests, net |  |  | 1,399 |  | 4,805
Payments on long-term debt and financing leases | (161,857) |  | (98,200) |  | (73,633)
Cash flows from financing activities | 730,227 |  | 365,461 |  | 305,169
Effect of exchange rate changes on cash | (747) |  | 309 |  | 2
Net increase (decrease) in cash, cash equivalents, and restricted cash | 62,834 |  | (11,783) |  | 21,573
Cash, cash equivalents, and restricted cash, beginning of year | 87,054 |  | 98,837 |  | 77,264
Cash, cash equivalents, and restricted cash, end of year | 149,888 |  | 87,054 |  | 98,837
Supplemental disclosures of cash flow information: |  |  |  |  |
Cash paid for interest | 32,954 |  | 18,782 |  | 20,143
Cash paid for income taxes | 7,278 |  | 2,670 |  | 1,465
Non-cash Federal ESPC settlement | 293,427 |  | 67,286 |  | 54,139
Accrued purchases of energy assets | 88,793 |  | 37,064 |  | 43,807
Non-cash contributions from non-controlling interest | 16,206 |  | 0 |  | 0
Non-cash portion of investment fund call option exercise | 1,323 |  | 2,759 |  | 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] |  |  |  |  |
Cash and cash equivalents | 115,534 | [1] | 50,450 | [1] | 66,422
Short-term restricted cash | 20,782 | [1] | 24,267 | [1] | 22,063
Long-term restricted cash | 13,572 |  | 12,337 |  | 10,352
Total cash, cash equivalents, and restricted cash | $ 149,888 |  | $ 87,054 |  | $ 98,837
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) of $213,913 as of December 31, 2022 and $124,454 as of December 31, 2021. Includes non-recourse liabilities of consolidated VIEs of $50,729 as of December 31, 2022 and $31,125 as of December 31, 2021. See Note 11.

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