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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 63,904 | $ 98,549 | $ 80,191
Adjustments to reconcile net income to net cash flows from operating activities: |  |  |
Depreciation of energy assets, net | 59,390 | 49,755 | 43,113
Depreciation of property and equipment | 4,155 | 2,665 | 3,143
Amortization of debt discount and debt issuance costs | 4,201 | 4,211 | 2,849
Amortization of intangible assets | 2,366 | 1,858 | 321
Net increase in fair value of contingent consideration | 347 | 1,614 | 0
Accretion of ARO liabilities | 258 | 146 | 123
Impairment of goodwill | 2,222 | 0 | 0
Provision (recoveries of) for bad debts | 356 | (382) | 187
Impairment of long-lived assets / loss on write-off | 1,710 | 937 | 1,901
In-kind lease expenses, net | (3,164) | 0 | 0
Gain on sale of equity investments | 0 | 0 | (575)
(Earnings) loss from unconsolidated entities | (1,758) | (1,647) | 118
Net (gain) loss from derivatives | (1,108) | (212) | 240
Stock-based compensation expense | 10,318 | 15,046 | 8,716
Deferred income taxes, net | (27,602) | 3,918 | (4,760)
Unrealized foreign exchange (gain) loss | (368) | (123) | 142
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 52,647 | 3,477 | (15,953)
Accounts receivable retainage | 4,337 | 4,716 | (12,882)
Federal ESPC receivable | (260,378) | (259,499) | (249,728)
Inventory, net | 581 | (5,411) | (232)
Costs and estimated earnings in excess of billings | (13,211) | (272,629) | (113,192)
Prepaid expenses and other current assets | (41,125) | (3,182) | 1,770
Project development costs | (5,486) | (685) | 1,949
Other assets | (6,896) | (11,327) | (1,870)
Accounts payable, accrued expenses, and other current liabilities | 53,238 | 36,155 | 83,473
Billings in excess of cost and estimated earnings | 26,202 | 449 | (693)
Other liabilities | 3,559 | (5,074) | (5,036)
Income taxes receivable (payable), net | 1,314 | (1,613) | 4,389
Cash flows from operating activities | (69,991) | (338,288) | (172,296)
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (5,713) | (5,296) | (4,896)
Capital investment in energy assets | (538,418) | (304,596) | (170,277)
Capital investment in major maintenance of energy assets | (7,636) | (18,007) | (8,602)
Grant award proceeds for energy assets | 0 | 0 | 774
Proceeds from sale of equity investment | 0 | 0 | 1,672
Acquisitions, net of cash received | (9,182) | 0 | (14,928)
Contributions to equity and other investments | (5,429) | 0 | (9,000)
Loans to joint venture investments | (565) | (459) | 0
Cash flows from investing activities | (566,943) | (328,358) | (205,257)
Cash flows from financing activities: |  |  |
Proceeds from equity offering, net of offering costs | 0 | 0 | 120,084
Payments of debt discount and debt issuance costs | (9,315) | (3,695) | (2,919)
Proceeds from exercises of options and ESPP | 4,455 | 5,963 | 6,927
Payment of contingent consideration | (1,866) | 0 | 0
(Payments on) proceeds from senior secured revolving credit facility, net | (43,000) | 137,900 | (8,073)
Proceeds from long-term debt financings | 843,498 | 468,476 | 185,994
Proceeds from Federal ESPC projects | 154,338 | 238,360 | 159,216
Net proceeds from energy asset receivable financing arrangements | 14,512 | 14,341 | 2,033
Investment fund call option exercise | 0 | (839) | (1,000)
Contributions from non-controlling interest | 3,738 | 32,706 | 0
Distributions to non-controlling interest | (21,842) | 0 | 0
(Distributions to) proceeds from redeemable non-controlling interests, net | (658) | (1,128) |
(Distributions to) proceeds from redeemable non-controlling interests, net |  |  | 1,399
Payments on long-term debt and financing leases | (303,057) | (161,857) | (98,200)
Cash flows from financing activities | 640,803 | 730,227 | 365,461
Effect of exchange rate changes on cash | (81) | (747) | 309
Net increase (decrease) in cash, cash equivalents, and restricted cash | 3,788 | 62,834 | (11,783)
Cash, cash equivalents, and restricted cash, beginning of year | 149,888 | 87,054 | 98,837
Cash, cash equivalents, and restricted cash, end of year | 153,676 | 149,888 | 87,054
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | 80,251 | 32,954 | 18,782
Cash paid for income taxes | 3,834 | 7,278 | 2,670
Non-cash Federal ESPC settlement | 99,164 | 293,427 | 67,286
Accrued purchases of energy assets | 78,382 | 88,793 | 37,064
Non-cash contributions from non-controlling interest | 464 | 16,206 | 0
Non-cash financing for energy asset project acquisition | 82,964 | 0 | 0
Non-cash portion of investment fund call option exercise | $ 0 | $ 1,323 | $ 2,759

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