Ameresco (AMRC) 10-Q 6 Aug 24 2024 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Aug. 02, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-34811
Entity Registrant Name	Ameresco, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3512838
Entity Address, Address Line One	111 Speen Street
Entity Address, Address Line Two	Suite 410
Entity Address, City or Town	Framingham
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01701
City Area Code	508
Local Phone Number	661-2200
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	AMRC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001488139
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		34,402,515
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		18,000,000

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	[1]	$ 150,278	$ 79,271
Restricted cash	[1]	68,082	62,311
Accounts receivable, net of allowance of $2,060 and $903, respectively	[1]	154,665	153,362
Accounts receivable retainage, net		39,225	33,826
Costs and estimated earnings in excess of billings	[1]	651,748	636,163
Inventory, net		12,484	13,637
Prepaid expenses and other current assets	[1]	134,375	123,391
Income taxes receivable		4,819	5,775
Project development costs, net		24,280	20,735
Total current assets	[1]	1,239,956	1,128,471
Federal ESPC receivable		552,376	609,265
Property and equipment, net	[1]	16,995	17,395
Energy assets, net	[1]	1,813,649	1,689,424
Deferred income tax assets, net		29,512	26,411
Goodwill, net		75,245	75,587
Intangible assets, net		5,639	6,808
Operating lease assets	[1]	68,194	58,586
Restricted cash, non-current portion	[1]	14,740	12,094
Other assets	[1]	148,796	89,735
Total assets	[1]	3,965,102	3,713,776
Current liabilities:
Current portions of long-term debt and financing lease liabilities, net	[1]	523,832	322,247
Accounts payable	[1]	497,026	402,752
Accrued expenses and other current liabilities	[1]	100,198	108,831
Current portions of operating lease liabilities	[1]	13,618	13,569
Billings in excess of cost and estimated earnings		97,493	52,903
Income taxes payable		220	1,169
Total current liabilities	[1]	1,232,387	901,471
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs	[1]	1,078,995	1,170,075
Federal ESPC liabilities		511,226	533,054
Deferred income tax liabilities, net		4,365	4,479
Deferred grant income		6,669	6,974
Long-term operating lease liabilities, net of current portion	[1]	48,545	42,258
Other liabilities	[1]	97,946	82,714
Commitments and contingencies (Note 10)
Redeemable non-controlling interests, net		43,777	46,865
Stockholders’ equity:
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2024 and December 31, 2023		0	0
Additional paid-in capital		332,356	320,892
Retained earnings		597,930	595,911
Accumulated other comprehensive loss, net		(3,800)	(3,045)
Treasury stock, at cost, 2,101,795 shares at June 30, 2024 and December 31, 2023		(11,788)	(11,788)
Stockholders’ equity before non-controlling interest		914,703	901,975
Non-controlling interests		26,489	23,911
Total stockholders’ equity		941,192	925,886
Total liabilities, redeemable non-controlling interests, and stockholders’ equity		3,965,102	3,713,776
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, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Allowance		$ 2,060	$ 903
Total VIE assets	[1]	$ 3,965,102	$ 3,713,776
Preferred stock, par value (in usd per share)		$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)		5,000,000	5,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Treasury stock (in shares)		2,101,795	2,101,795
Class A Common Stock
Common stock, par value (in usd per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)		500,000,000	500,000,000
Common stock, shares issued (in shares)		36,504,310	36,378,990
Common stock, shares outstanding (in shares)		34,402,515	34,277,195
Class B Common Stock
Common stock, par value (in usd per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)		144,000,000	144,000,000
Common stock, shares issued (in shares)		18,000,000	18,000,000
Common stock, shares outstanding (in shares)		18,000,000	18,000,000
Variable Interest Entity, Primary Beneficiary
Total VIE assets		$ 196,379	$ 312,701
Total VIE liabilities		$ 43,071	$ 199,063
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenues	$ 437,982	$ 327,074	$ 736,388	$ 598,116
Cost of revenues	372,813	268,425	624,226	489,519
Gross profit	65,169	58,649	112,162	108,597
Earnings from unconsolidated entities	10	380	565	830
Selling, general and administrative expenses	44,226	41,413	83,781	82,714
Operating income	20,953	17,616	28,946	26,713
Other expenses, net	15,759	9,198	29,930	17,241
Income (loss) before income taxes	5,194	8,418	(984)	9,472
Income tax provision (benefit)	0	5	0	(498)
Net income (loss)	5,194	8,413	(984)	9,970
Net (income) loss attributable to non-controlling interests and redeemable non-controlling interests	(184)	(2,045)	3,057	(2,500)
Net income attributable to common shareholders	$ 5,010	$ 6,368	$ 2,073	$ 7,470
Net income attributable to common shareholders
Basic (in usd per share)	$ 0.10	$ 0.12	$ 0.04	$ 0.14
Diluted (in usd per share)	$ 0.09	$ 0.12	$ 0.04	$ 0.14
Weighted average common shares outstanding:
Basic (in shares)	52,355	52,127	52,322	52,045
Diluted (in shares)	53,113	53,211	53,016	53,232

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,194	$ 8,413	$ (984)	$ 9,970
Other comprehensive (loss) income:
Unrealized gain (loss) from interest rate hedges, net of tax	75	820	614	(48)
Foreign currency translation adjustments	(189)	943	(1,351)	1,226
Total other comprehensive (loss) income	(114)	1,763	(737)	1,178
Comprehensive (loss) income	5,080	10,176	(1,721)	11,148
Comprehensive (income) loss attributable to non-controlling interests and redeemable non-controlling interests:
Net loss (income)	(184)	(2,045)	3,057	(2,500)
Foreign currency translation adjustments	(94)	(2)	(18)	(10)
Comprehensive loss (income) attributable to non-controlling interests and redeemable non-controlling interests	(278)	(2,047)	3,039	(2,510)
Comprehensive income attributable to common shareholders	$ 4,802	$ 8,129	$ 1,318	$ 8,638

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Redeemable Non-controlling Interests and Stockholders’ Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Non-controlling Interests (“NCI”)
Redeemable non-controlling interests, beginning balance at Dec. 31, 2022	$ 46,623
Redeemable Non-controlling Interests (“RNCI”)
Distributions to RNCI	(335)
Accretion of tax equity financing fees	55
Investment fund call option exercise	195
Net income (loss)	1,456
Redeemable non-controlling interests, ending balance at Jun. 30, 2023	47,994
Beginning balance (in shares) at Dec. 31, 2022				33,948,362	18,000,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2022									2,101,795
Beginning balance at Dec. 31, 2022	873,031			$ 3	$ 2	$ 306,314	$ 533,549	$ (4,051)	$ (11,788)	$ 49,002
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				216,600
Exercise of stock options	2,093					2,093
Stock-based compensation expense	7,999					7,999
Employee stock purchase plan (in shares)				24,833
Employee stock purchase plan	1,017					1,017
Restricted stock units released (in shares)				10,815
Unrealized gain (loss) from interest rate hedges, net	(48)							(48)
Foreign currency translation adjustment	1,226							1,215		11
Accretion of tax equity financing fees	(55)						(55)
Investment fund call option exercise	(195)					(195)
Contributions from NCI	922									922
Distributions to NCI	(20,521)									(20,521)
Net income (loss)	8,514						7,470			1,044
Ending balance (in shares) at Jun. 30, 2023				34,200,610	18,000,000
Treasury stock, ending balance (in shares) at Jun. 30, 2023									2,101,795
Ending balance at Jun. 30, 2023	873,983			$ 3	$ 2	317,228	540,964	(2,884)	$ (11,788)	30,458
Redeemable non-controlling interests, beginning balance at Mar. 31, 2023	46,700
Redeemable Non-controlling Interests (“RNCI”)
Distributions to RNCI	(157)
Accretion of tax equity financing fees	28
Net income (loss)	1,423
Redeemable non-controlling interests, ending balance at Jun. 30, 2023	47,994
Beginning balance (in shares) at Mar. 31, 2023				34,030,362	18,000,000
Treasury stock, beginning balance (in shares) at Mar. 31, 2023									2,101,795
Beginning balance at Mar. 31, 2023	894,772			$ 3	$ 2	310,726	534,624	(4,645)	$ (11,788)	65,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				134,600
Exercise of stock options	1,523					1,523
Stock-based compensation expense	3,962					3,962
Employee stock purchase plan (in shares)				24,833
Employee stock purchase plan	1,017					1,017
Restricted stock units released (in shares)				10,815
Unrealized gain (loss) from interest rate hedges, net	820							820
Foreign currency translation adjustment	943							941		2
Accretion of tax equity financing fees	(28)						(28)
Contributions from NCI	812									812
Distributions to NCI	(36,828)									(36,828)
Net income (loss)	6,990						6,368			622
Ending balance (in shares) at Jun. 30, 2023				34,200,610	18,000,000
Treasury stock, ending balance (in shares) at Jun. 30, 2023									2,101,795
Ending balance at Jun. 30, 2023	873,983			$ 3	$ 2	317,228	540,964	(2,884)	$ (11,788)	30,458
Redeemable non-controlling interests, beginning balance at Dec. 31, 2023	46,865
Redeemable Non-controlling Interests (“RNCI”)
Distributions to RNCI	(287)
Accretion of tax equity financing fees	54
Net income (loss)	(2,855)
Redeemable non-controlling interests, ending balance at Jun. 30, 2024	$ 43,777
Beginning balance (in shares) at Dec. 31, 2023		34,277,195	18,000,000	34,277,195	18,000,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2023	2,101,795								2,101,795
Beginning balance at Dec. 31, 2023	$ 925,886			$ 3	$ 2	320,892	595,911	(3,045)	$ (11,788)	23,911
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				62,589
Exercise of stock options	504					504
Stock-based compensation expense	6,704					6,704
Employee stock purchase plan (in shares)				32,841
Employee stock purchase plan	990					990
Restricted stock units released (in shares)				29,890
Unrealized gain (loss) from interest rate hedges, net	614							614
Foreign currency translation adjustment	(1,351)							(1,369)		18
Accretion of tax equity financing fees	(54)						(54)
Contributions from NCI	30,792					3,040				27,752
Distributions to NCI	(1,004)									(1,004)
Purchase of shares from NCI	(23,760)					226				(23,986)
Net income (loss)	$ 1,871						2,073			(202)
Ending balance (in shares) at Jun. 30, 2024		34,402,515	18,000,000	34,402,515	18,000,000
Treasury stock, ending balance (in shares) at Jun. 30, 2024	2,101,795								2,101,795
Ending balance at Jun. 30, 2024	$ 941,192			$ 3	$ 2	332,356	597,930	(3,800)	$ (11,788)	26,489
Redeemable non-controlling interests, beginning balance at Mar. 31, 2024	43,908
Redeemable Non-controlling Interests (“RNCI”)
Distributions to RNCI	(158)
Accretion of tax equity financing fees	27
Redeemable non-controlling interests, ending balance at Jun. 30, 2024	43,777
Beginning balance (in shares) at Mar. 31, 2024				34,320,161	18,000,000
Treasury stock, beginning balance (in shares) at Mar. 31, 2024									2,101,795
Beginning balance at Mar. 31, 2024	930,163			$ 3	$ 2	327,367	592,947	(3,592)	$ (11,788)	25,224
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				30,700
Exercise of stock options	321					321
Stock-based compensation expense	3,678					3,678
Employee stock purchase plan (in shares)				32,841
Employee stock purchase plan	990					990
Restricted stock units released (in shares)				18,813
Unrealized gain (loss) from interest rate hedges, net	75							75
Foreign currency translation adjustment	(189)							(283)		94
Accretion of tax equity financing fees	(27)						(27)
Contributions from NCI	1,928									1,928
Distributions to NCI	(941)									(941)
Net income (loss)	$ 5,194						5,010			184
Ending balance (in shares) at Jun. 30, 2024		34,402,515	18,000,000	34,402,515	18,000,000
Treasury stock, ending balance (in shares) at Jun. 30, 2024	2,101,795								2,101,795
Ending balance at Jun. 30, 2024	$ 941,192			$ 3	$ 2	$ 332,356	$ 597,930	$ (3,800)	$ (11,788)	$ 26,489

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net (loss) income	$ 5,194	$ 8,413	$ (984)	$ 9,970
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Depreciation of energy assets, net	18,561	14,384	35,685	27,725
Depreciation of property and equipment			2,452	1,607
Increase in contingent consideration			0	155
Accretion of ARO liabilities			154	130
Amortization of debt discount and debt issuance costs			2,322	2,364
Amortization of intangible assets			1,076	991
Provision for credit losses			1,211	579
Loss on disposal of assets and impairment loss			382	18
Non-cash project revenue related to in-kind leases			(2,347)	0
Earnings from unconsolidated entities	(10)	(380)	(565)	(830)
Net gain from derivatives			(3,968)	(261)
Stock-based compensation expense			6,704	7,999
Deferred income taxes, net			687	(3,177)
Unrealized foreign exchange loss			1,027	38
Changes in operating assets and liabilities:
Accounts receivable			5,943	60,028
Accounts receivable retainage			(5,525)	354
Federal ESPC receivable			(85,788)	(88,072)
Inventory, net			1,153	91
Costs and estimated earnings in excess of billings			(27,779)	15,664
Prepaid expenses and other current assets			24,698	1,312
Income taxes receivable, net			21	11
Project development costs			(3,719)	(2,825)
Other assets			(3,118)	(1,867)
Accounts payable, accrued expenses and other current liabilities			72,777	(80,555)
Billings in excess of cost and estimated earnings			46,969	13,462
Other liabilities			4,663	1,240
Cash flows from operating activities			74,131	(33,849)
Cash flows from investing activities:
Purchases of property and equipment			(2,066)	(2,662)
Capital investments in energy assets			(227,383)	(261,547)
Capital investments in major maintenance of energy assets			(10,527)	(5,810)
Net proceeds from equity method investments			12,956	0
Contributions to equity method investments			(6,192)	0
Acquisitions, net of cash received			0	(9,184)
Loans to joint venture investments			0	(39)
Cash flows from investing activities			(233,212)	(279,242)
Cash flows from financing activities:
Payments of debt discount and debt issuance costs			(6,008)	(5,074)
Proceeds from exercises of options and ESPP			1,494	3,110
Payments on senior secured revolving credit facility, net			(34,900)	(80,000)
Proceeds from long-term debt financings			359,331	343,923
Proceeds from Federal ESPC projects			120,128	76,699
Net proceeds from energy asset receivable financing arrangements			5,280	8,114
Contributions from non-controlling interests			30,792	499
Distributions to non-controlling interest			(1,004)	(20,521)
Distributions to redeemable non-controlling interests, net			(263)	(338)
Payment on seller's promissory note			(29,441)	0
Payments on debt and financing leases			(206,974)	(61,335)
Cash flows from financing activities			238,435	265,077
Effect of exchange rate changes on cash			70	(61)
Net increase (decrease) in cash, cash equivalents, and restricted cash			79,424	(48,075)
Cash, cash equivalents, and restricted cash, beginning of period			153,676	149,888	$ 149,888
Cash, cash equivalents, and restricted cash, end of period	$ 233,100	$ 101,813	233,100	101,813	$ 153,676
Supplemental disclosures of cash flow information:
Cash paid for interest			52,528	31,778
Cash paid for income taxes			824	2,500
Non-cash Federal ESPC settlement			143,936	91,379
Accrued purchases of energy assets			89,593	80,519
Non-cash contributions from non-controlling interest			0	422
Non-cash financing for energy asset project acquisition			$ 32,500	$ 0

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying condensed consolidated financial statements of Ameresco, Inc. (including its subsidiaries, the “Company,” “Ameresco,” “we,” “our,” or “us”) are unaudited, according to certain rules and regulations of the Securities and Exchange Commission, and include, in our opinion, normal recurring adjustments necessary for a fair presentation in conformity with accounting principles generally accepted in the United States (“GAAP”) of the results for the periods indicated. The results of operations for the three and six months ended June 30, 2024 are not necessarily indicative of results which may be expected for the full year. The December 31, 2023 consolidated balance sheet data was derived from audited financial statements, but certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The interim condensed consolidated financial statements and accompanying notes should be read in conjunction with the audited consolidated financial statements and accompanying notes for the year ended December 31, 2023, included in our annual report on Form 10-K (“2023 Form 10-K”) filed with the Securities and Exchange Commission on February 29, 2024 as amended on March 11, 2024. Reclassification and Rounding Certain prior period amounts were reclassified to conform to the presentation in the current period. We round amounts in the condensed consolidated financial statements to thousands and calculate all percentages and per-share data from the underlying whole-dollar amounts. Thus, certain amounts may not foot, crossfoot, or recalculate based on reported numbers due to rounding. Significant Risks and Uncertainties Global factors have continued to result in global supply chain disruptions and inflationary pressures. We have considered the impact of general global economic conditions on the assumptions and estimates used, which may change in response to this evolving situation. Results of future operations and liquidity could be adversely impacted by a number of factors including supply chain disruptions, varying levels of inflation, payments of outstanding receivable amounts beyond normal payment terms, workforce disruptions, and uncertain demand. As of the date of issuance of these condensed consolidated financial statements, we cannot reasonably estimate the extent to which macroeconomic conditions may impact our financial condition, liquidity, or results of operations in the foreseeable future. The ultimate impact of the pandemic and general global economic conditions on our business is highly uncertain and will depend on future developments, and such impacts could exist for an extended period of time, even after the pandemic subsides.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Our accounting policies are set forth in Note 2 to the consolidated financial statements contained in our 2023 Form 10-K . We have included certain updates to those policies below. Accounts Receivable and Allowance for Credit Losses Changes in the allowance for credit losses are as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Allowance for credit losses, beginning of period $ 898 $ 971 $ 903 $ 911 Charges to costs and expenses, net 1,210 486 1,211 579 Account write-offs and other (48) (554) (54) (587) Allowance for credit losses, end of period $ 2,060 $ 903 $ 2,060 $ 903 Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist primarily of other receivables, deferred project costs, and other short-term prepaid expenditures that will be expensed within one year. Prepaid expenses and other current assets comprised of the following: June 30, 2024 December 31, 2023 Other receivables $ 17,185 $ 74,454 Deferred project costs 105,746 38,240 Prepaid expenses 11,444 10,697 Prepaid expenses and other current assets $ 134,375 $ 123,391 Recent Accounting Pronouncements Business Combinations— Joint Venture Formations In August 2023, the FASB issued ASU 2023-05, Business Combinations— Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement, which addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture’s separate financial statements. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative, which updates the disclosure or presentation requirements for a variety of topics in the codification. ASU 2023-06 is effective from the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K, with early adoption prohibited. We will monitor the removal of the requirements from the current regulations and adopt the related amendments, but we do not anticipate this new guidance will have a material impact on our condensed consolidated financial statements as we are currently subject to SEC requirements. Segment Reporting (Topic 820) - Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 820) - Improvements to Reportable Segment Disclosures, which improves reportable segment disclosures by requiring enhanced disclosures for significant segment expenses and other segment items. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Income Taxes (Topic 740) - Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance the income tax disclosures, including disaggregation of information in the rate reconciliation table and disaggregated information related to income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Compensation—Stock Compensation (Topic 718) - Scope Application of Profits Interest and Similar Awards In March 2024, the FASB issued ASU 2024-01, Compensation—Stock Compensation (Topic 718) - Scope Application of Profits Interest and Similar Awards, to clarify how to determine if a profits interest or similar award is within the scope of ASC 718 or is not a share-based payment arrangement and is within the scope of other guidance. ASU 2024-01 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Codification Improvements—Amendments to Remove References to the Concepts Statements In March 2024, the FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements, to remove references to various FASB Concepts Statements based on suggestions received from stakeholders on the Accounting Standards Codification and other incremental improvements to GAAP. ASU 2024-02 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2024
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS Disaggregation of Revenue Our reportable segments for the three and six months ended June 30, 2024 were North America Regions, U.S. Federal, Europe, Alternative Fuels and All Other. On January 1, 2024, we changed the structure of our internal organization, and our U.S. Regions and Canada are now included in North America Regions. Additionally, our Asset Sustainability Group was formerly included in Canada, but is now included in “All Other”. As a result, previously reported amounts have been reclassified for comparative purposes. The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2024: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 178,742 $ 68,080 $ 70,064 $ 13,884 $ (7) $ 330,763 O&M revenue 8,511 14,628 895 2,136 — 26,170 Energy assets 19,746 3,724 189 29,728 29 53,416 Other 1,132 305 1,911 104 24,181 27,633 Total revenues $ 208,131 $ 86,737 $ 73,059 $ 45,852 $ 24,203 $ 437,982 The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2023: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 124,584 $ 63,904 $ 40,399 $ — $ — $ 228,887 O&M revenue 6,362 13,901 460 2,295 — 23,018 Energy assets 19,391 2,164 452 28,021 (22) 50,006 Other 1,434 50 2,214 — 21,465 25,163 Total revenues $ 151,771 $ 80,019 $ 43,525 $ 30,316 $ 21,443 $ 327,074 The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2024: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 294,953 $ 111,559 $ 111,488 $ 17,047 $ — $ 535,047 O&M revenue 15,444 29,906 1,642 4,513 — 51,505 Energy assets 33,500 5,653 360 57,028 29 96,570 Other 2,519 509 3,691 123 46,424 53,266 Total revenues $ 346,416 $ 147,627 $ 117,181 $ 78,711 $ 46,453 $ 736,388 The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2023: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 243,815 $ 109,453 $ 57,599 $ — $ 1,250 $ 412,117 O&M revenue 11,901 26,601 793 5,981 — 45,276 Energy assets 33,798 3,240 971 52,674 95 90,778 Other 2,799 281 3,258 — 43,607 49,945 Total revenues $ 292,313 $ 139,575 $ 62,621 $ 58,655 $ 44,952 $ 598,116 The following table presents information related to our revenue recognized over time: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Percentage of revenue recognized over time 96% 95% 95% 94% The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized. We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area : Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 United States $ 349,500 $ 270,957 $ 588,599 $ 504,041 Canada 15,416 13,566 30,596 30,800 Europe 73,066 42,551 117,193 63,275 Total revenues $ 437,982 $ 327,074 $ 736,388 $ 598,116 Contract Balances The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers: June 30, 2024 December 31, 2023 Accounts receivable, net $ 154,665 $ 153,362 Accounts receivable retainage, net 39,225 33,826 Contract Assets: Costs and estimated earnings in excess of billings $ 651,748 $ 636,163 Contract Liabilities: Billings in excess of cost and estimated earnings $ 97,493 $ 52,903 Billings in excess of cost and estimated earnings, non-current (1) 20,340 18,688 Total contract liabilities $ 117,833 $ 71,591 June 30, 2023 December 31, 2022 Accounts receivable, net $ 123,361 $ 174,009 Accounts receivable retainage, net 37,803 38,057 Contract Assets: Costs and estimated earnings in excess of billings $ 575,113 $ 576,363 Contract Liabilities: Billings in excess of cost and estimated earnings $ 40,459 $ 34,796 Billings in excess of cost and estimated earnings, non-current (1) 15,659 7,617 Total contract liabilities $ 56,118 $ 42,413 (1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets. The increase in contract assets for the six months ended June 30, 2024 was primarily due to revenue recognized of $490,125 offset by billings of $494,441. Contract assets also increased due to reclassifications, primarily from contract liabilities as a result of timing of customer payments. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, as well as reclassifications from contract assets as a result of timing of customer payments. The advance payments and reclassifications exceeded the recognition of revenue as performance obligations were satisfied. For the six months ended June 30, 2024, we recognized revenue of $148,279 and billed $153,688 to customers that had balances which were included in contract liabilities at December 31, 2023. The decrease in contract assets for the six months ended June 30, 2023 was primarily due to billings of $436,030 offset by revenue recognized of $413,181. Contract assets are also affected by reclassifications, primarily from contract liabilities as a result of timing of customer payments. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, as well as reclassifications from contract assets as a result of timing of customer payments. The advance payments and reclassifications exceeded the recognition of revenue as performance obligations were satisfied. For the six months ended June 30, 2023, we recognized revenue of $73,585 and billed $80,774 to customers that had balances which were included in the beginning balance of contract liabilities. Performance Obligations Our remaining performance obligations (“backlog”) represent the unrecognized revenue value of our contract commitments. At June 30, 2024, we had contracted backlog of $2,836,452 of which approximately 32% is anticipated to be recognized as revenue in the next twelve months. The remaining performance obligations primarily relate to the energy efficiency and renewable energy construction projects, including long-term operations and maintenance (“O&M”) services related to these projects. The long-term services have varying initial contract terms, up to 25 years. Project Development Costs Project development costs of $3,164 and $3,605 were recognized in our condensed consolidated statements of income on projects that converted to customer contracts during the three months ended June 30, 2024 and 2023, respectively. Project development costs of $6,284 and $6,217 were recognized in the condensed consolidated statements of income on projects that converted to customer contracts during the six months ended June 30, 2024 and 2023, respectively. No impairment charges in connection with our project development costs were recorded during the three or six months ended June 30, 2024 and 2023.

Business Acquisitions and Relat

Business Acquisitions and Related Transactions	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
BUSINESS ACQUISITIONS AND RELATED TRANSACTIONS	BUSINESS ACQUISITIONS AND RELATED TRANSACTIONS We account for acquisitions using the acquisition method in accordance with ASC 805, Business Combinations. The purchase price for each acquisition is allocated to the assets based on their estimated fair values at the date of acquisition. The excess purchase price over the estimated fair value of the net assets acquired, which is calculated using level 3 inputs per the fair value hierarchy as defined in Note 11, is recorded as goodwill. Intangible assets, if identified, are also recorded. See Note 5 for additional information. Enerqos Energy Solutions S.r.l. (“Enerqos”) On February 24, 2023, we signed a definitive purchase and sale agreement to acquire Enerqos, a renewable energy and energy efficiency company headquartered in Milan, Italy. The acquisition closed on March 30, 2023 and the total purchase consideration was $13,445, of which $9,535 has been paid. There is no contingent consideration related to this acquisition. Cash acquired was $353, debt assumed was $3,951, and a deferred tax liability, net of $931 was recorded. In accordance with the SEC’s Regulation S-X and GAAP, we evaluated and determined that Enerqos is not deemed to be a significant subsidiary, therefore, we are not presenting the pro-forma effects of this acquisition on our operations. The estimated goodwill of $6,855 from the Enerqos acquisition consists largely of expected benefits, including the combined entities experience and the acquired workforce. This goodwill is not deductible for income tax purposes. The estimated fair value of tangible and intangible assets acquired, and liabilities assumed are based on management's estimates and assumptions that are preliminary and subject to adjustments. Any adjustments made beyond the measurement period will be included in our condensed consolidated statements of income. The results of the acquisition since the date of the acquisition have been included in our operations as presented in the accompanying condensed consolidated statements of income, condensed consolidated statements of comprehensive income and condensed consolidated statements of cash flows. For the three months ended June 30, 2024, we recognized $8,855 of revenue and $989 of net loss relating to Enerqos and for the six months ended June 30, 2024, we recognized $13,033 of revenue and $1,729 of net loss relating to Enerqos. For the three and six months ended June 30, 2023, we recognized $13,041 of revenue and $182 of net income relating to Enerqos. A summary of the cumulative consideration paid and allocation of the purchase price for the Enerqos acquisition are presented in the table below: Preliminary March 31, 2023 Measurement Period Adjustment As Adjusted December 31, 2023 Cash $ 9,535 $ — $ 9,535 Long-term debt assumed, net of current portions 3,951 — 3,951 FX adjustment (41) — (41) Fair value of consideration transferred $ 13,445 $ — $ 13,445 Cash and cash equivalents $ 190 $ — $ 190 Accounts receivable 6,230 — 6,230 Costs and estimated earnings in excess of billings 8,985 — 8,985 Prepaid expenses and other current assets 16,504 — 16,504 Project development costs 5,140 — 5,140 Property and equipment and energy assets 1,234 — 1,234 Intangible assets 4,438 — 4,438 Long-term restricted cash 163 — 163 Accounts payable (15,480) — (15,480) Accrued expenses and other current liabilities (4,510) 165 (4,345) Current portions of long-term debt (15,165) — (15,165) Deferred income tax liabilities, net (931) — (931) Other liabilities (208) — (208) Recognized identifiable assets acquired and liabilities assumed $ 6,590 $ 165 $ 6,755 Goodwill $ 6,855 $ (165) $ 6,690

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS, NET	GOODWILL AND INTANGIBLE ASSETS, NET Due to the change in the structure of our internal organization, a portion of our goodwill was allocated to two new reporting units based on their relative fair values as of January 1, 2024. See Note 3 for additional information about the organizational changes. The changes in the carrying value of goodwill balances by reportable segment were as follows: North America Regions U.S. Federal Europe Alternative Fuels Other Total Carrying Value of Goodwill Balance, December 31, 2023 $ 40,681 $ 3,981 $ 13,034 $ — $ 17,891 $ 75,587 Fair value allocation (1,474) — — — 1,474 — Currency effects (102) — (240) — — (342) Balance, June 30, 2024 $ 39,105 $ 3,981 $ 12,794 $ — $ 19,365 $ 75,245 Definite-lived intangible assets, net consisted of the following: As of June 30, 2024 As of December 31, 2023 Gross carrying amount $ 36,928 37,147 Less - accumulated amortization (31,289) (30,339) Intangible assets, net $ 5,639 $ 6,808 The table below sets forth amortization expense: Three Months Ended June 30, Six Months Ended June 30, Asset type Location 2024 2023 2024 2023 All other intangible assets Selling, general and administrative expenses $ 537 $ 689 $ 1,076 $ 991

Energy Assets, Net

Energy Assets, Net	6 Months Ended
	Jun. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
ENERGY ASSETS, NET	ENERGY ASSETS, NET Energy assets, net consisted of the following: June 30, 2024 December 31, 2023 Energy assets (1) $ 2,213,897 $ 2,054,145 Less - accumulated depreciation and amortization (400,248) (364,721) Energy assets, net $ 1,813,649 $ 1,689,424 (1) Includes financing lease assets (see Note 7), capitalized interest and asset retirement obligations (“ARO”) assets (see tables below). Also includes the energy asset projects acquired in January 2024. See section below for additional information. August 2023 Purchase and Sale Agreement On August 4, 2023, we entered into a purchase and sale agreement to acquire an energy asset project and to acquire 100% of the stock of Bright Canyon Energy Corporation (“BCE”) in a two-phased transaction. Phase 1, the purchase of the energy asset project, closed on August 4, 2023 and did not constitute a business in accordance with ASC 805-50, Business Combinations. The purchase price for phase 1 was $87,964, of which $5,000 was paid in cash, $46,694 was financed through a seller’s note, and we assumed a construction loan on the energy asset project for $36,270. We also acquired cash of $11,206. During the year ended December 31, 2023, we paid $18,400 in principal on the sellers note. In January 2024, the purchase price was increased by $1,147 and we paid off the seller’s note in the amount of $29,441. We also assumed a land lease for the energy asset project. On December 28, 2023, we executed an amended and restated purchase and sale agreement, which primarily revised the timing of payments on phase 2. In the second phase, which closed on January 12, 2024, we acquired BCE, including its interest in a consolidated joint venture and its interests in project subsidiaries developing or with rights to develop solar, battery, and microgrid assets for an adjusted purchase price of $47,956, of which $9,839 was paid in cash and $32,500 was financed through a seller’s note. The remaining balance due of $4,011 is included in accrued expenses and other current liabilities at June 30, 2024. We also assumed four land leases for the energy asset projects. See Note 8 for additional information about the BCE-related loans, Note 7 for information on the leases and Note 10 for potential additional commitments. Phase 2, the purchase of the energy asset projects did not constitute a business in accordance with ASC 805-50, Business Combinations. Transfer of Investment Tax Credits On June 27, 2024 we sold investment tax credits (“ITC”) on four energy assets to a third party at a fair value of $23,667 which was received during the three months ended June 30, 2024. We also received a deposit of $239 for the sale of ITC on four additional energy assets at a total fair value of $23,867. The benefit from the sale of the ITC will be recognized in profit or loss as a reduction to depreciation expense over the life of the energy assets. Depreciation and Amortization Expense The following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant and ITC amortization: Three Months Ended June 30, Six Months Ended June 30, Location 2024 2023 2024 2023 Cost of revenues (2) $ 18,561 $ 14,384 $ 35,685 $ 27,725 (2) Includes depreciation and amortization on financing lease assets (see Note 7). Capitalized Interest The following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Capitalized interest $ 15,578 $ 9,642 $ 30,450 $ 16,018 The following tables sets forth information related to our ARO assets and ARO liabilities: Location June 30, 2024 December 31, 2023 ARO assets, net Energy assets, net $ 4,551 $ 4,800 ARO liabilities, non-current Other liabilities $ 5,971 $ 5,960 Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Depreciation expense of ARO assets $ 66 $ 53 $ 110 $ 108 Accretion expense of ARO liabilities $ 88 $ 64 $ 154 $ 130

Leases

Leases	6 Months Ended
	Jun. 30, 2024
Leases [Abstract]
LEASES	LEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: June 30, 2024 December 31, 2023 Operating Leases: Operating lease assets $ 68,194 $ 58,586 Current portions of operating lease liabilities $ 13,618 $ 13,569 Long-term portions of operating lease liabilities 48,545 42,258 Total operating lease liabilities $ 62,163 $ 55,827 Weighted-average remaining lease term 19 years 18 years Weighted-average discount rate 6.6 % 6.6 % Financing Leases: Energy assets $ 26,210 $ 27,262 Current portions of financing lease liabilities $ 683 $ 871 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 12,749 13,057 Total financing lease liabilities $ 13,432 $ 13,928 Weighted-average remaining lease term 12 years 13 years Weighted-average discount rate 12.02 % 12.05 % The costs related to our leases were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating Leases: Operating lease costs $ 3,176 $ 2,316 $ 6,232 $ 4,436 Financing Leases: Amortization expense 526 525 1,052 1,051 Interest on lease liabilities 389 433 781 877 Total lease costs $ 4,091 $ 3,274 $ 8,065 $ 6,364 Supplemental cash flow information related to our leases was as follows: Six Months Ended June 30, 2024 2023 Cash paid for amounts included in the measurement of operating lease liabilities $ 9,682 $ 3,792 Right-of-use assets (“ROU”) obtained in exchange for new operating lease liabilities (1) $ 13,573 $ 3,486 (1) Includes non-monetary lease transactions of $10,378. See disclosure below for additional information. The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2024 $ 8,541 $ 1,149 2025 12,674 2,214 2026 7,303 2,054 2027 6,177 1,922 2028 5,155 1,955 Thereafter 61,393 15,934 Total minimum lease payments 101,243 25,228 Less: interest 39,080 11,796 Present value of lease liabilities $ 62,163 $ 13,432 We have future lease commitments for office and ground leases which do not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of these commitments total $18,859 as of June 30, 2024 and relate to lease payments to be made over 5 to 25 years. This includes a ground lease totaling $10,500 that we are in process of modifying such that the criteria to record a ROU asset and ROU liability may not be met. Non-monetary Lease Transactions We have six lease liabilities consisting of obligations that will be settled with non-monetary consideration. The lease liabilities relating to non-monetary consideration were recorded during the six months ended June 30, 2024 based on the fair market value of the project services or back up power expected to be provided, which approximate the cash payments. Sale-leasebacks These facilities are accounted for as failed sale leasebacks and are classified as long-term financing facilities. August 2018 Master Sale-leaseback We enter into amendments to our August 2018 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We sold and leased back two energy assets for $22,116 in cash proceeds under this facility during the six months ended June 30, 2024. As of June 30, 2024, we have available funds remaining under this lending commitment. Net gains from amortization expense recognized in cost of revenues relating to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $114 for the three and six months ended June 30, 2024 and 2023, respectively. December 2020 Master Sale-leaseback We enter into amendments to our December 2020 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We were in default under this agreement as we had failed to satisfy the insurance requirements and historical coverage ratio under this agreement. On May 3, 2024, we received a waiver on this default.
LEASES	LEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: June 30, 2024 December 31, 2023 Operating Leases: Operating lease assets $ 68,194 $ 58,586 Current portions of operating lease liabilities $ 13,618 $ 13,569 Long-term portions of operating lease liabilities 48,545 42,258 Total operating lease liabilities $ 62,163 $ 55,827 Weighted-average remaining lease term 19 years 18 years Weighted-average discount rate 6.6 % 6.6 % Financing Leases: Energy assets $ 26,210 $ 27,262 Current portions of financing lease liabilities $ 683 $ 871 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 12,749 13,057 Total financing lease liabilities $ 13,432 $ 13,928 Weighted-average remaining lease term 12 years 13 years Weighted-average discount rate 12.02 % 12.05 % The costs related to our leases were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating Leases: Operating lease costs $ 3,176 $ 2,316 $ 6,232 $ 4,436 Financing Leases: Amortization expense 526 525 1,052 1,051 Interest on lease liabilities 389 433 781 877 Total lease costs $ 4,091 $ 3,274 $ 8,065 $ 6,364 Supplemental cash flow information related to our leases was as follows: Six Months Ended June 30, 2024 2023 Cash paid for amounts included in the measurement of operating lease liabilities $ 9,682 $ 3,792 Right-of-use assets (“ROU”) obtained in exchange for new operating lease liabilities (1) $ 13,573 $ 3,486 (1) Includes non-monetary lease transactions of $10,378. See disclosure below for additional information. The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2024 $ 8,541 $ 1,149 2025 12,674 2,214 2026 7,303 2,054 2027 6,177 1,922 2028 5,155 1,955 Thereafter 61,393 15,934 Total minimum lease payments 101,243 25,228 Less: interest 39,080 11,796 Present value of lease liabilities $ 62,163 $ 13,432 We have future lease commitments for office and ground leases which do not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of these commitments total $18,859 as of June 30, 2024 and relate to lease payments to be made over 5 to 25 years. This includes a ground lease totaling $10,500 that we are in process of modifying such that the criteria to record a ROU asset and ROU liability may not be met. Non-monetary Lease Transactions We have six lease liabilities consisting of obligations that will be settled with non-monetary consideration. The lease liabilities relating to non-monetary consideration were recorded during the six months ended June 30, 2024 based on the fair market value of the project services or back up power expected to be provided, which approximate the cash payments. Sale-leasebacks These facilities are accounted for as failed sale leasebacks and are classified as long-term financing facilities. August 2018 Master Sale-leaseback We enter into amendments to our August 2018 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We sold and leased back two energy assets for $22,116 in cash proceeds under this facility during the six months ended June 30, 2024. As of June 30, 2024, we have available funds remaining under this lending commitment. Net gains from amortization expense recognized in cost of revenues relating to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $114 for the three and six months ended June 30, 2024 and 2023, respectively. December 2020 Master Sale-leaseback We enter into amendments to our December 2020 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We were in default under this agreement as we had failed to satisfy the insurance requirements and historical coverage ratio under this agreement. On May 3, 2024, we received a waiver on this default.
LEASES	LEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: June 30, 2024 December 31, 2023 Operating Leases: Operating lease assets $ 68,194 $ 58,586 Current portions of operating lease liabilities $ 13,618 $ 13,569 Long-term portions of operating lease liabilities 48,545 42,258 Total operating lease liabilities $ 62,163 $ 55,827 Weighted-average remaining lease term 19 years 18 years Weighted-average discount rate 6.6 % 6.6 % Financing Leases: Energy assets $ 26,210 $ 27,262 Current portions of financing lease liabilities $ 683 $ 871 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 12,749 13,057 Total financing lease liabilities $ 13,432 $ 13,928 Weighted-average remaining lease term 12 years 13 years Weighted-average discount rate 12.02 % 12.05 % The costs related to our leases were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating Leases: Operating lease costs $ 3,176 $ 2,316 $ 6,232 $ 4,436 Financing Leases: Amortization expense 526 525 1,052 1,051 Interest on lease liabilities 389 433 781 877 Total lease costs $ 4,091 $ 3,274 $ 8,065 $ 6,364 Supplemental cash flow information related to our leases was as follows: Six Months Ended June 30, 2024 2023 Cash paid for amounts included in the measurement of operating lease liabilities $ 9,682 $ 3,792 Right-of-use assets (“ROU”) obtained in exchange for new operating lease liabilities (1) $ 13,573 $ 3,486 (1) Includes non-monetary lease transactions of $10,378. See disclosure below for additional information. The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2024 $ 8,541 $ 1,149 2025 12,674 2,214 2026 7,303 2,054 2027 6,177 1,922 2028 5,155 1,955 Thereafter 61,393 15,934 Total minimum lease payments 101,243 25,228 Less: interest 39,080 11,796 Present value of lease liabilities $ 62,163 $ 13,432 We have future lease commitments for office and ground leases which do not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of these commitments total $18,859 as of June 30, 2024 and relate to lease payments to be made over 5 to 25 years. This includes a ground lease totaling $10,500 that we are in process of modifying such that the criteria to record a ROU asset and ROU liability may not be met. Non-monetary Lease Transactions We have six lease liabilities consisting of obligations that will be settled with non-monetary consideration. The lease liabilities relating to non-monetary consideration were recorded during the six months ended June 30, 2024 based on the fair market value of the project services or back up power expected to be provided, which approximate the cash payments. Sale-leasebacks These facilities are accounted for as failed sale leasebacks and are classified as long-term financing facilities. August 2018 Master Sale-leaseback We enter into amendments to our August 2018 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We sold and leased back two energy assets for $22,116 in cash proceeds under this facility during the six months ended June 30, 2024. As of June 30, 2024, we have available funds remaining under this lending commitment. Net gains from amortization expense recognized in cost of revenues relating to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $114 for the three and six months ended June 30, 2024 and 2023, respectively. December 2020 Master Sale-leaseback We enter into amendments to our December 2020 master lease and participation agreement from to time to time, which may extend the maturity date, increase the availability, or modify other covenants. We were in default under this agreement as we had failed to satisfy the insurance requirements and historical coverage ratio under this agreement. On May 3, 2024, we received a waiver on this default.

Debt and Financing Lease Liabil

Debt and Financing Lease Liabilities	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
DEBT AND FINANCING LEASE LIABILITIES	DEBT AND FINANCING LEASE LIABILITIES Our debt and financing lease liabilities are comprised of the following: June 30, 2024 December 31, 2023 Senior secured revolving credit facility (1) $ 105,000 $ 140,000 Senior secured term loans 72,500 139,900 Second lien term loan 100,000 — Energy asset construction facilities (2) 427,346 470,248 Energy asset term loans (2) 718,373 564,530 Sale-leasebacks (3) 199,353 185,698 Financing lease liabilities (4) 13,432 13,928 Total debt and financing lease liabilities 1,636,004 1,514,304 Less: current maturities 523,832 322,247 Less: unamortized discount and debt issuance costs 33,177 21,982 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs $ 1,078,995 $ 1,170,075 (1) At June 30, 2024, funds of $81,996 were available for borrowing under this facility. (2) Most of these agreements are now using the Secured Overnight Financing Rate (“SOFR”) as the primary reference rate used to calculate interest. (3) These facilities are accounted for as failed sale leasebacks and are classified as long-term financing facilities. See Note 7 for additional disclosures. (4) Financing lease liabilities are sale-leaseback arrangements under previous guidance. See Note 7 for additional disclosures. Senior Secured Credit Facility On April 10, 2024, we entered into amendment number five to the fifth amended and restated senior secured credit facility to extend the maturity date of the delayed draw term loan A (“DDTLA”) from March 4, 2025 to August 15, 2024. The amendment also included the following modifications: • principal installments on the DDTLA of $5,000 at closing of the amendment and $7,500 each on or before May 15, 2024, June 15, 2024, and July 15, 2024, with the balance of $7,500 due on August 15, 2024, • the date by which we shall use commercially reasonable efforts to raise $100,000 in equity or subordinated debt financing was changed from April 15, 2024 to May 15, 2024. On June 28, 2024, we entered into amendment number six to the fifth amended and restated senior secured credit facility to modify certain of the covenants and other terms to permit us to enter into the second lien credit agreement (as defined below) and to incur indebtedness and make certain other conforming changes in connection with our entry into the second lien credit agreement. June 2024, Second Lien Term Loan, due June 28, 2029 On June 28, 2024, we entered into a second lien credit agreement which provided a term loan in a principal amount of $100,000 with a maturity date of June 28, 2029. The term loan bears an interest rate of SOFR (5.353% at June 30, 2024), plus an applicable margin of 5.875% per annum. Interest is payable quarterly and unpaid interest and principal is due in the aggregate on June 28, 2029. At closing, we incurred $3,623 in lenders fees and debt issuance costs. Proceeds from this term loan in the amount of $82,105 and $15,000 were used to pay towards our revolving credit facility and the outstanding portion of the DDTLA, respectively, under our senior secured credit facility at closing. April 2024, Term Notes, due June 30, 2042 On April 5, 2024, an omnibus amendment and reaffirmation agreement was executed with reference to the note purchase and private shelf agreement, dated as of July 27, 2021, and two new series B notes (first lien and second lien) were authorized in the amounts of $92,512 and $12,657, with a maturity date of June 30, 2042. Gross proceeds from the initial issuance on April 5, 2024 were $83,282 and $12,292 with the remainder to be issued upon achieving certain permitting-related and other administrative conditions. The notes bear interest at fixed rates of 6.20% and 8.00%, respectively, per annum and the interest is payable quarterly commencing September 30, 2024. At closing, we incurred $1,296 in lenders fees and debt issuance costs. Proceeds from these notes in the amount of $86,462 were used to pay a portion of the August 2023 construction credit facility. In connection with these notes, we recorded two derivative instruments for make-whole provisions with initial values of $8,733 and $647, respectively, which were recorded as debt discount. October 2022, Financing Facility, 6.70%, due August 31, 2039 During the six months ended June 30, 2024, we drew down an additional $38,280 and at June 30, 2024, $373,852 was outstanding under this facility, net of unamortized debt discount and issuance costs. April 2023, Construction Credit Facility, 6.81%, due August 16, 2024 During the six months ended June 30, 2024, we drew down an additional $6,429 and at June 30, 2024, $140,506 was outstanding under this facility, net of unamortized debt discount. On July 31, 2024, we executed an extension on this facility updating the maturity date from July 31, 2024 to August 16, 2024. August 2023, Construction Credit Facility, 9.34%, due August 31, 2026 During the six months ended June 30, 2024, we drew down an additional $82,785 and at June 30, 2024, $252,126 was outstanding under this facility, net of unamortized debt discount and issuance costs. We were in default on this credit facility due to administrative errors, for which a waiver was received on June 27, 2024. Debt Instruments - Energy Asset Acquisitions As discussed in Note 6, on August 4, 2023, we acquired an energy asset project. The purchase price for phase 1 was $87,964, of which $5,000 was paid in cash, $46,694 was financed through a seller’s note, and we assumed a construction loan on the energy asset project for $36,270. During the year ended December 31, 2023, we paid $18,400 in principal on the seller’s note. In January 2024, the purchase price was increased by $1,147 and we paid off the seller’s note in the amount of $29,441. On February 26, 2024, the construction loan in the amount of $36,270 was converted into a term loan and has a maturity date of April 2030. The term loan bears a base SOFR interest rate of 5.35% at June 30, 2024, and an applicable margin of 1.635% per annum for four years after the term conversion date and 1.76% per annum for the following two years. The interest and principal are paid quarterly commencing on June 30, 2024. We failed to achieve the final conditions required to convert the term loan on or prior to June 30, 2024, therefore, the $35,696 outstanding balance was classified as current debt at June 30, 2024. We are negotiating a waiver with the lender that will become effective when the final conditions are met, which is expected to be during the quarter ending September 30, 2024. In the second phase, which closed on January 12, 2024, we acquired BCE, including its interest in a consolidated joint venture and its interests in project subsidiaries developing or with rights to develop solar, battery, and microgrid assets for an adjusted purchase price of $47,956, of which $9,839 was paid in cash and $32,500 was financed through a seller’s note. The note bore interest at a fixed rate of 5.0% per annum and the principal and interest was due in August 2024. The note was amended on August 2, 2024 to provide that it be paid in four installments through December 16, 2024 and bears interest at a rate of 5.0% per annum through August 2, 2024 and a rate of 9.0% per annum thereafter.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES We recorded a provision for income taxes of $0 and $5 for the three months ended June 30, 2024 and 2023, respectively. We recorded a provision for income taxes of $0 and benefit of $498 for the six months ended June 30, 2024 and 2023, respectively. The effective tax rate was 0.0% for the three months ended June 30, 2024 , compared to the effective tax rate of 0.1% for the three months ended June 30, 2023 . The principal reasons for the higher effective rate for 2024 is due to the effects of a smaller Section 179D Energy Efficient Building deduction, offset by higher investment tax credits from solar, and storage plants placed into service or are forecasted to be placed into service during 2024, state taxes, and foreign earnings. The effective tax rate was 0.0% for the six months ended June 30, 2024 , compared to a benefit of 5.3% for the six months ended June 30, 2023 . The principal reasons for the higher effective rate for 2024 is due to the effects of a smaller Section 179D Energy Efficient Building deduction, offset by higher investment tax credits from solar, and storage plants placed into service or are forecasted to be placed into service during 2024, state taxes, and foreign earnings.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES From time to time, we issue letters of credit and performance bonds with our third-party lenders, to provide collateral. Legal Proceedings We are involved in a variety of other claims and other legal proceedings generally incidental to our normal business activities. When we conclude that it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, it is accrued through a charge to earnings and, if material, disclosed below. When only a range of amounts is reasonably estimable and no amount within the range is more likely than another, the low end of the range is recorded. While the ultimate amount of liability incurred in any of these matters is dependent on future developments, in our opinion, the recorded liability is adequate to cover the future payment of such liability and claims. However, the final outcome of any of these claims and legal proceedings cannot be predicted with certainty, and unfavorable or unexpected outcomes could result in additional accruals that could be significant to results of operations in a particular year or quarter. Any adjustments to the recorded liability will be reflected in earnings in the periods in which such adjustments become known. For any other claims where a loss may be reasonably possible, but not probable, or is probable but not reasonably estimable, no accrual is established, but the matter, if potentially material, is disclosed below. We routinely review relevant information with respect to our matters and update our accruals, disclosures and estimates of reasonably possible loss based on such reviews. While the outcome of any of these matters cannot be accurately predicted, we do not believe the ultimate resolution of any of these existing matters would have a material adverse effect on our financial condition or results of operations. In October 2021, we entered into a contract with SCE to design and build three grid scale battery energy storage system (“BESS”) at three sites near existing substation parcels throughout SCE’s service territory in California with an aggregate capacity of 537.5 megawatt (“MW”) (“the SCE Agreement”). As previously disclosed, due to supply chain delays, weather, and other events, we were unable to complete the projects by August 1, 2022 (the “Guaranteed Completion Date”) and made related force majeure claims. In late 2022, SCE also instructed us to adjust the completion of the sites into 2023. Under the SCE Agreement, a failure to reach the Guaranteed Co mpletion Date could, under certain circumstances, result in liquidated damages up to a maximum amount of $89 million being applied. We have been working with SCE to analyze the applicability and scope of force majeure relief based on our force majeure claims and we expect that SCE will withhold liquidated damages for at least two of the three projects. Our view is that liquidated damages should not be applied. It is at least reasonably possible we may incur an obligation to pay liquidated damages up to the maximum amount. Commitments as a Result of Acquisitions In December 2021, we completed our acquisition of Plug Smart which provided for an earn-out based on future EBITDA targets beginning with EBITDA performance for the month of December 2021 and each fiscal year thereafter, over a five-year period through December 31, 2026. The maximum cumulative earn-out is $5,000 and we evaluated financial forecasts of the acquired business and concluded that the fair value of this earn-out after payments of $3,040 was approximately $1,465 at December 31, 2023 and June 30, 2024, and is included in accrued expenses and other current liabilities, and other liabilities on the condensed consolidated balance sheets. See Note 11 for additional information. The August 4, 2023 purchase and sale agreement with BCE includes a potential earn-out that could be earned if the projects achieve specified value thresholds in certain phase 2 projects, each of which is very early in development, or if milestones are achieved on other future projects that are not yet started. The total earn-out is limited to $40,000 over a seven-year period beginning on January 12, 2024. We will record a liability for the phase 2 earn-out payments when the amounts are probable and estimable. As of June 30, 2024, none of the earn-out amounts are considered probable and estimable.

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENT	FAIR VALUE MEASUREMENT We recognize our financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Three levels of inputs that may be used to measure fair value are as follows: Level 1: Inputs are based on unadjusted quoted prices for identical instruments traded in active markets. Level 2: Inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques. The following table presents the input level used to determine the fair values of our financial instruments measured at fair value on a recurring basis: Fair Value as of Level June 30, 2024 December 31, 2023 Assets: Interest rate swap instruments 2 $ 5,503 $ 3,970 Liabilities: Interest rate swap instruments 2 $ — $ 629 Make-whole provisions 2 12,750 6,012 Contingent consideration 3 1,465 1,465 Total liabilities $ 14,215 $ 8,106 The following table sets forth a summary of changes in the fair value of contingent consideration liability classified as level 3: Fair Value as of June 30, 2024 December 31, 2023 Contingent consideration liability balance at the beginning of period $ 1,465 $ 4,158 Changes in fair value included in earnings — 347 Payment of contingent consideration — (3,040) Contingent consideration liability balance at the end of period $ 1,465 $ 1,465 The following table sets forth the fair value and the carrying value of our long-term debt, excluding financing leases: As of June 30, 2024 As of December 31, 2023 Fair Value Carrying Value Fair Value Carrying Value Long-term debt (Level 2) $ 1,584,047 $ 1,589,395 $ 1,466,458 $ 1,478,394 The fair value of our long-term debt was estimated using discounted cash flows analysis, based on our current incremental borrowing rates for similar types of borrowing arrangements which are considered to be level two inputs. There have been no transfers in or out of level two or three financial instruments for the six months ended June 30, 2024 and the year ended December 31, 2023. We are also required to periodically measure certain other assets at fair value on a nonrecurring basis, including long-lived assets, goodwill and other intangible assets. We calculated the fair value used in our annual goodwill impairment analysis utilizing a discounted cash flow analysis and determined that the inputs used were level 3 inputs. There were no assets recorded at fair value on a non-recurring basis as of June 30, 2024 or December 31, 2023.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The following table presents information about the fair value amounts of our cash flow derivative instruments: Derivatives as of June 30, 2024 December 31, 2023 Balance Sheet Location Fair Value Fair Value Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 1,853 $ 1,023 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 3,650 $ 2,947 Interest rate swap contracts Other liabilities $ — $ 629 Make-whole provisions Other liabilities $ 12,750 $ 6,012 As of June 30, 2024 and December 31, 2023, all but 3 of our freestanding derivatives were designated as hedging instruments. The following table presents information about the effects of our derivative instruments on our condensed consolidated statements of income and condensed consolidated statements of comprehensive income: Amount of (Gain) Loss Recognized in Net Income (Loss) Location of (Gain) Loss Recognized in Net Income (Loss) Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (271) $ (222) $ (547) $ (211) Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (229) $ (338) $ (1,331) $ 182 Make-whole provisions Other expenses, net $ (1,380) $ (86) $ (2,637) $ (443) The following table presents the changes in Accumulated Other Comprehensive Income (“AOCI”), net of taxes, from our hedging instruments: Six Months Ended June 30, 2024 Derivatives Designated as Hedging Instruments: Accumulated gain in AOCI at the beginning of the period $ 746 Unrealized gain recognized in AOCI 1,161 Gain reclassified from AOCI to other expenses, net (547) Gain on derivatives 614 Accumulated gain in AOCI at the end of the period $ 1,360 The following tables present all of our active derivative instruments as of June 30, 2024: Active Interest Rate Swaps Expiration Date Initial Notional Status 11-Year, 5.77% Fixed October 2029 $ 9,200 Designated 15-Year, 5.24% Fixed June 2033 $ 10,000 Designated 10-Year, 4.74% Fixed December 2027 $ 14,100 Designated 8-Year, 3.49% Fixed June 2028 $ 14,643 Designated 8-Year, 3.49% Fixed June 2028 $ 10,734 Designated 13-Year, 0.72% Fixed March 2033 $ 9,505 Not Designated 13-Year, 0.72% Fixed March 2033 $ 6,968 Not Designated 17.75-Year, 3.16% Fixed December 2040 $ 14,084 Designated 18-Year, 3.81% Fixed July 2041 $ 32,021 Not Designated Other Derivatives Classification Effective Date Expiration Date Fair Value ($) Make-whole provisions Liability June/August 2018 December 2038 $ 241 Make-whole provisions Liability August 2016 April 2031 $ 30 Make-whole provisions Liability April 2017 February 2034 $ 26 Make-whole provisions Liability November 2020 December 2027 $ 24 Make-whole provisions Liability October 2011 May 2028 $ 1 Make-whole provisions Liability May 2021 April 2045 $ 11 Make-whole provisions Liability July 2021 March 2046 $ 2,310 Make-whole provisions Liability June 2022 March 2042 $ 870 Make-whole provisions Liability March 2023 December 2047 $ 1,348 Make-whole provisions Liability April 2024 June 2042 $ 7,390 Make-whole provisions Liability April 2024 June 2042 $ 499

Variable Interest Entities And

Variable Interest Entities And Equity Method Investments	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS	VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS Variable Interest Entities The table below presents a summary of amounts related to our consolidated investment funds and joint ventures, which we determined meet the definition of a variable interest entity (“VIE”), as of: June 30, 2024 (1) December 31, 2023 (1) Investment Funds Other VIEs Total VIEs Investment Funds Other VIEs Total VIEs Cash and cash equivalents $ 2,362 $ 3,421 $ 5,783 $ 5,099 $ 16,780 $ 21,879 Accounts receivable, net — 1,308 1,308 — 1,977 1,977 Costs and estimated earnings in excess of billings 2,417 16,380 18,797 662 13,409 14,071 Prepaid expenses and other current assets 20 2,671 2,691 33 3,749 3,782 Total VIE current assets 4,799 23,780 28,579 5,794 35,915 41,709 Property and equipment, net — — — — 267 267 Energy assets, net 77,425 85,066 162,491 79,104 173,808 252,912 Operating lease assets 4,668 — 4,668 4,748 12,908 17,656 Restricted cash, non-current portion 73 — 73 73 — 73 Other assets 10 558 568 10 74 84 Total VIE assets $ 86,975 $ 109,404 $ 196,379 $ 89,729 $ 222,972 $ 312,701 Current portions of long-term debt and financing lease liabilities $ 2,174 $ — $ 2,174 $ 2,190 $ 132,427 $ 134,617 Accounts payable 1,379 11,635 13,014 1,440 6,490 7,930 Accrued expenses and other current liabilities 222 5,533 5,755 241 22,780 23,021 Current portions of operating lease liabilities 142 — 142 133 6,953 7,086 Total VIE current liabilities 3,917 17,168 21,085 4,004 168,650 172,654 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 16,594 — 16,594 17,167 — 17,167 Long-term operating lease liabilities, net of current portion 5,010 — 5,010 5,063 3,823 8,886 Other liabilities 382 — 382 356 — 356 Total VIE liabilities $ 25,903 $ 17,168 $ 43,071 $ 26,590 $ 172,473 $ 199,063 (1) The amounts in the above table are reflected in Note 1 on our condensed consolidated balance sheets. See Note 14 for additional information on the call and put options related to our investment funds. Non-controlling Interests Non-controlling interests represents the equity owned by the other joint venture members of consolidated joint ventures. On February 9, 2024, we entered into an agreement to sell a 40% interest in a consolidated joint venture and we received $28,864 in cash. During the six months ended June 30, 2024, we acquired the remaining interest in one joint venture when we closed on the phase 2 acquisition of BCE as discussed in Note 6. Equity and Cost Method Investments Unconsolidated joint ventures are accounted for under the equity method. For these unconsolidated joint ventures, our investment balances are included in other assets on the condensed consolidated balance sheets and our pro rata share of net income or loss is included in earnings from unconsolidated entities on the condensed consolidated statements of income. During the six months ended June 30, 2024, one of our equity method investments was sold to another company. We received distributions and net proceeds totaling $12,956 and recognized a gain on the sale in the amount of $89, which is included earnings from unconsolidated entities in the condensed consolidated statements of income. The following table provides information about our equity and cost method investments in joint ventures: As of June 30, 2024 December 31, 2023 Equity and cost method investments $ 12,271 $ 18,709

Redeemable Non-controlling Inte

Redeemable Non-controlling Interests	6 Months Ended
	Jun. 30, 2024
Noncontrolling Interest [Abstract]
REDEEMABLE NON-CONTROLLING INTERESTS	REDEEMABLE NON-CONTROLLING INTERESTS Our subsidiaries with membership interests in the investment funds we formed have the right to elect to require the non-controlling interest holder to sell all of its membership units to our subsidiaries, a call option. Our investment funds also include rights for the non-controlling interest holder to elect to require our subsidiaries to purchase all of the non-controlling membership interests in the fund, a put option. The call options are exercisable beginning on the date that specified conditions are met for each respective fund. The call option start date for two of these funds began in April 2024 and June 2024. The put options for the investment funds are exercisable beginning on the date that specified conditions are met for each respective fund. We initially record our redeemable non-controlling interests at fair value on the date of acquisition and subsequently adjust to redemption value. At both June 30, 2024 and December 31, 2023 redeemable non-controlling interests were reported at their carrying values, as the carrying value at each reporting period was greater than the estimated redemption value.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Earnings Per Share The following is a reconciliation of the numerator and denominator for the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, (In thousands, except per share data) 2024 2023 2024 2023 Numerator: Net income attributable to common shareholders $ 5,010 $ 6,368 $ 2,073 $ 7,470 Adjustment for accretion of tax equity financing fees (27) (28) (54) (55) Income attributable to common shareholders $ 4,983 $ 6,340 $ 2,019 $ 7,415 Denominator: Basic weighted-average shares outstanding 52,355 52,127 52,322 52,045 Effect of dilutive securities: Stock options 758 1,084 694 1,187 Diluted weighted-average shares outstanding 53,113 53,211 53,016 53,232 Net income per share attributable to common shareholders: Basic $ 0.10 $ 0.12 $ 0.04 $ 0.14 Diluted $ 0.09 $ 0.12 $ 0.04 $ 0.14 Potentially dilutive shares (1) 2,228 1,961 2,092 1,939 (1) Potentially dilutive shares attributable to stock options were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION We recorded stock-based compensation expense, including expense related to our employee stock purchase plan, as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Stock-based compensation expense $ 3,678 $ 3,962 $ 6,704 $ 7,999 Our stock-based compensation expense is included in selling, general and administrative expenses in the condensed consolidated statements of income. As of June 30, 2024, there was $31,609 of unrecognized compensation expense related to non-vested stock option awards that is expected to be recognized over a weighted-average period of 2.1 years. Stock Option and Restricted Stock Units (“RSUs”) Grants

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
BUSINESS SEGMENT INFORMATION	BUSINESS SEGMENT INFORMATION Our reportable segments for the three and six months ended June 30, 2024 were North America Regions, U.S. Federal, Europe, Alternative Fuels and All Other. On January 1, 2024, we changed the structure of our internal organization, and our U.S. Regions and Canada are now included in North America Regions. Additionally, our Asset Sustainability Group was formerly included in Canada, but is now included in “All Other”. As a result, previously reported amounts have been reclassified for comparative purposes. Our North America Regions, U.S. Federal and Europe segments offer energy efficiency products and services which include the design, engineering and installation of equipment and other measures to improve the efficiency and control the operation of a facility’s energy infrastructure, renewable energy solutions and services and the development and construction of small-scale plants that Ameresco owns or develops for customers that produce electricity, gas, heat or cooling from renewable sources of energy and O&M services. Our Alternative Fuels segment sells electricity, thermal, renewable fuel, or biomethane using biogas as a feedstock from small-scale plants that we own and operate, and provides O&M services for customer-owned small-scale plants. The “All Other” category includes consulting services and the sale of solar PV energy products and systems which we refer to as integrated-PV. These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. Certain reportable segments are an aggregation of operating segments. The tables below present our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Three Months Ended June 30, 2024 Revenues $ 208,131 $ 86,737 $ 73,059 $ 45,852 $ 24,203 $ 437,982 (Gain) loss on derivatives (1,381) (231) — 3 — (1,609) Interest expense, net of interest income 2,514 1,416 858 5,749 — 10,537 Depreciation and amortization of intangible assets 8,796 2,859 514 7,019 716 19,904 Unallocated corporate activity — — — — — (22,632) Income before taxes, excluding unallocated corporate activity 8,843 9,384 1,833 4,846 2,920 27,826 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Three Months Ended June 30, 2023 Revenues $ 151,771 $ 80,019 $ 43,525 $ 30,316 $ 21,443 $ 327,074 (Gain) loss on derivatives (86) 66 — (404) — (424) Interest expense, net of interest income 1,897 288 630 3,436 — 6,251 Depreciation and amortization of intangible assets 7,112 1,235 611 6,204 427 15,589 Unallocated corporate activity — — — — — (17,131) Income before taxes, excluding unallocated corporate activity 11,019 8,887 1,080 3,111 1,452 25,549 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Six months ended June 30, 2024 Revenues $ 346,416 $ 147,627 $ 117,181 $ 78,711 $ 46,453 $ 736,388 Gain on derivatives (2,637) (1,026) — (305) — (3,968) Interest expense, net of interest income 4,211 2,191 1,776 11,431 — 19,609 Depreciation and amortization of intangible assets 16,870 4,875 1,010 14,215 1,312 38,282 Unallocated corporate activity — — — — — (44,775) Income before taxes, excluding unallocated corporate activity 14,436 16,741 1,241 6,022 5,351 43,791 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Six Months Ended June 30, 2023 Revenues $ 292,313 $ 139,575 $ 62,621 $ 58,655 $ 44,952 $ 598,116 (Gain) loss on derivatives (381) 4 — 116 — (261) Interest expense, net of interest income 3,482 586 751 5,787 (2) 10,604 Depreciation and amortization of intangible assets 13,565 2,460 785 12,072 558 29,440 Unallocated corporate activity — — — — — (35,974) Income before taxes, excluding unallocated corporate activity 19,269 14,099 1,203 6,626 4,249 45,446 See Note 3 for additional information about our revenues by product line.

Other Expenses, Net

Other Expenses, Net	6 Months Ended
	Jun. 30, 2024
Other Income and Expenses [Abstract]
OTHER EXPENSES, NET	OTHER EXPENSES, NET The following table presents the components of other expenses, net: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Gain on derivatives $ (1,609) $ (424) $ (3,968) $ (261) Interest expense, net of interest income 14,809 7,222 29,044 14,415 Amortization of debt discount and debt issuance costs 1,340 1,575 2,322 2,365 Foreign currency transaction loss (gain) 546 150 1,678 (7) Government incentives — (577) — (523) Factoring & other fees 673 1,252 854 1,252 Other expenses, net $ 15,759 $ 9,198 $ 29,930 $ 17,241

Assets Held For Sale

Assets Held For Sale	6 Months Ended
	Jun. 30, 2024
Discontinued Operations and Disposal Groups [Abstract]
ASSETS HELD FOR SALE	ASSETS HELD FOR SALE During the six months ended June 30, 2024, we determined that there were sixteen energy asset projects under construction that were considered to be assets held for sale, since these assets were being marketed for sale and all the criteria to be classified as held for sale under ASC 360, Property, Plant and Equipment—Impairment or Disposal of Long-Lived Assets, had been met. The carrying value of these assets was $101,520 and $38,404 as of June 30, 2024 and December 31, 2023, respectively, with liabilities directly associated with assets classified as held for sale of $16,341 and $8,351 as of June 30, 2024 and December 31, 2023, respectively. Assets held for sale are measured at the lower of their carrying value or the fair value less cost to sell. The table below reflects the assets and liabilities associated with assets held for sale by segment: June 30, 2024 December 31, 2023 North America Regions U.S. Federal Total North America Regions U.S. Federal Total Other assets $ 55,569 $ 42,612 $ 98,181 $ 18,895 $ 18,253 $ 37,148 Operating lease assets 2,599 740 3,339 1,256 — 1,256 Assets classified as held for sale $ 58,168 $ 43,352 $ 101,520 $ 20,151 $ 18,253 $ 38,404 Accounts payable $ 7,713 $ 3,762 $ 11,475 $ 5,418 $ 601 $ 6,019 Accrued expenses and other current liabilities 63 — 63 14 — 14 Billings in excess of cost and estimated earnings — 1,088 1,088 — 1,088 1,088 Long-term operating lease liabilities, net of current portion 2,973 742 3,715 1,230 — 1,230 Liabilities directly associated with assets classified as held for sale $ 10,749 $ 5,592 $ 16,341 $ 6,662 $ 1,689 $ 8,351

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net income attributable to common shareholders	$ 5,010	$ 6,368	$ 2,073	$ 7,470

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The accompanying condensed consolidated financial statements of Ameresco, Inc. (including its subsidiaries, the “Company,” “Ameresco,” “we,” “our,” or “us”) are unaudited, according to certain rules and regulations of the Securities and Exchange Commission, and include, in our opinion, normal recurring adjustments necessary for a fair presentation in conformity with accounting principles generally accepted in the United States (“GAAP”) of the results for the periods indicated.
Reclassification and Rounding	Reclassification and Rounding Certain prior period amounts were reclassified to conform to the presentation in the current period. We round amounts in the condensed consolidated financial statements to thousands and calculate all percentages and per-share data from the underlying whole-dollar amounts. Thus, certain amounts may not foot, crossfoot, or recalculate based on reported numbers due to rounding.
Prepaid Expenses and Other Current Assets	Prepaid Expenses and Other Current Assets
Recent Accounting Pronouncements	Recent Accounting Pronouncements Business Combinations— Joint Venture Formations In August 2023, the FASB issued ASU 2023-05, Business Combinations— Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement, which addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture’s separate financial statements. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative, which updates the disclosure or presentation requirements for a variety of topics in the codification. ASU 2023-06 is effective from the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K, with early adoption prohibited. We will monitor the removal of the requirements from the current regulations and adopt the related amendments, but we do not anticipate this new guidance will have a material impact on our condensed consolidated financial statements as we are currently subject to SEC requirements. Segment Reporting (Topic 820) - Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 820) - Improvements to Reportable Segment Disclosures, which improves reportable segment disclosures by requiring enhanced disclosures for significant segment expenses and other segment items. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Income Taxes (Topic 740) - Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance the income tax disclosures, including disaggregation of information in the rate reconciliation table and disaggregated information related to income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Compensation—Stock Compensation (Topic 718) - Scope Application of Profits Interest and Similar Awards In March 2024, the FASB issued ASU 2024-01, Compensation—Stock Compensation (Topic 718) - Scope Application of Profits Interest and Similar Awards, to clarify how to determine if a profits interest or similar award is within the scope of ASC 718 or is not a share-based payment arrangement and is within the scope of other guidance. ASU 2024-01 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements. Codification Improvements—Amendments to Remove References to the Concepts Statements In March 2024, the FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements, to remove references to various FASB Concepts Statements based on suggestions received from stakeholders on the Accounting Standards Codification and other incremental improvements to GAAP. ASU 2024-02 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Summary of Allowance for Credit Loss	Changes in the allowance for credit losses are as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Allowance for credit losses, beginning of period $ 898 $ 971 $ 903 $ 911 Charges to costs and expenses, net 1,210 486 1,211 579 Account write-offs and other (48) (554) (54) (587) Allowance for credit losses, end of period $ 2,060 $ 903 $ 2,060 $ 903
Summary of Prepaid Expenses And Other Current Assets	Prepaid expenses and other current assets comprised of the following: June 30, 2024 December 31, 2023 Other receivables $ 17,185 $ 74,454 Deferred project costs 105,746 38,240 Prepaid expenses 11,444 10,697 Prepaid expenses and other current assets $ 134,375 $ 123,391

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2024
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue	The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2024: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 178,742 $ 68,080 $ 70,064 $ 13,884 $ (7) $ 330,763 O&M revenue 8,511 14,628 895 2,136 — 26,170 Energy assets 19,746 3,724 189 29,728 29 53,416 Other 1,132 305 1,911 104 24,181 27,633 Total revenues $ 208,131 $ 86,737 $ 73,059 $ 45,852 $ 24,203 $ 437,982 The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2023: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 124,584 $ 63,904 $ 40,399 $ — $ — $ 228,887 O&M revenue 6,362 13,901 460 2,295 — 23,018 Energy assets 19,391 2,164 452 28,021 (22) 50,006 Other 1,434 50 2,214 — 21,465 25,163 Total revenues $ 151,771 $ 80,019 $ 43,525 $ 30,316 $ 21,443 $ 327,074 The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2024: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 294,953 $ 111,559 $ 111,488 $ 17,047 $ — $ 535,047 O&M revenue 15,444 29,906 1,642 4,513 — 51,505 Energy assets 33,500 5,653 360 57,028 29 96,570 Other 2,519 509 3,691 123 46,424 53,266 Total revenues $ 346,416 $ 147,627 $ 117,181 $ 78,711 $ 46,453 $ 736,388 The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2023: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Project revenue $ 243,815 $ 109,453 $ 57,599 $ — $ 1,250 $ 412,117 O&M revenue 11,901 26,601 793 5,981 — 45,276 Energy assets 33,798 3,240 971 52,674 95 90,778 Other 2,799 281 3,258 — 43,607 49,945 Total revenues $ 292,313 $ 139,575 $ 62,621 $ 58,655 $ 44,952 $ 598,116 The following table presents information related to our revenue recognized over time: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Percentage of revenue recognized over time 96% 95% 95% 94% The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized. We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area : Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 United States $ 349,500 $ 270,957 $ 588,599 $ 504,041 Canada 15,416 13,566 30,596 30,800 Europe 73,066 42,551 117,193 63,275 Total revenues $ 437,982 $ 327,074 $ 736,388 $ 598,116
Summary of Contract with Customer, Asset and Liability	The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers: June 30, 2024 December 31, 2023 Accounts receivable, net $ 154,665 $ 153,362 Accounts receivable retainage, net 39,225 33,826 Contract Assets: Costs and estimated earnings in excess of billings $ 651,748 $ 636,163 Contract Liabilities: Billings in excess of cost and estimated earnings $ 97,493 $ 52,903 Billings in excess of cost and estimated earnings, non-current (1) 20,340 18,688 Total contract liabilities $ 117,833 $ 71,591 June 30, 2023 December 31, 2022 Accounts receivable, net $ 123,361 $ 174,009 Accounts receivable retainage, net 37,803 38,057 Contract Assets: Costs and estimated earnings in excess of billings $ 575,113 $ 576,363 Contract Liabilities: Billings in excess of cost and estimated earnings $ 40,459 $ 34,796 Billings in excess of cost and estimated earnings, non-current (1) 15,659 7,617 Total contract liabilities $ 56,118 $ 42,413 (1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets.

Business Acquisitions and Rel_2

Business Acquisitions and Related Transactions (Tables)	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Summary of Purchase Price Allocation by Acquisitions	A summary of the cumulative consideration paid and allocation of the purchase price for the Enerqos acquisition are presented in the table below: Preliminary March 31, 2023 Measurement Period Adjustment As Adjusted December 31, 2023 Cash $ 9,535 $ — $ 9,535 Long-term debt assumed, net of current portions 3,951 — 3,951 FX adjustment (41) — (41) Fair value of consideration transferred $ 13,445 $ — $ 13,445 Cash and cash equivalents $ 190 $ — $ 190 Accounts receivable 6,230 — 6,230 Costs and estimated earnings in excess of billings 8,985 — 8,985 Prepaid expenses and other current assets 16,504 — 16,504 Project development costs 5,140 — 5,140 Property and equipment and energy assets 1,234 — 1,234 Intangible assets 4,438 — 4,438 Long-term restricted cash 163 — 163 Accounts payable (15,480) — (15,480) Accrued expenses and other current liabilities (4,510) 165 (4,345) Current portions of long-term debt (15,165) — (15,165) Deferred income tax liabilities, net (931) — (931) Other liabilities (208) — (208) Recognized identifiable assets acquired and liabilities assumed $ 6,590 $ 165 $ 6,755 Goodwill $ 6,855 $ (165) $ 6,690
Summary of Purchase Price Allocation by Acquisitions	A summary of the cumulative consideration paid and allocation of the purchase price for the Enerqos acquisition are presented in the table below: Preliminary March 31, 2023 Measurement Period Adjustment As Adjusted December 31, 2023 Cash $ 9,535 $ — $ 9,535 Long-term debt assumed, net of current portions 3,951 — 3,951 FX adjustment (41) — (41) Fair value of consideration transferred $ 13,445 $ — $ 13,445 Cash and cash equivalents $ 190 $ — $ 190 Accounts receivable 6,230 — 6,230 Costs and estimated earnings in excess of billings 8,985 — 8,985 Prepaid expenses and other current assets 16,504 — 16,504 Project development costs 5,140 — 5,140 Property and equipment and energy assets 1,234 — 1,234 Intangible assets 4,438 — 4,438 Long-term restricted cash 163 — 163 Accounts payable (15,480) — (15,480) Accrued expenses and other current liabilities (4,510) 165 (4,345) Current portions of long-term debt (15,165) — (15,165) Deferred income tax liabilities, net (931) — (931) Other liabilities (208) — (208) Recognized identifiable assets acquired and liabilities assumed $ 6,590 $ 165 $ 6,755 Goodwill $ 6,855 $ (165) $ 6,690

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Carrying Value of Goodwill Attributable to Each Reportable Segment	The changes in the carrying value of goodwill balances by reportable segment were as follows: North America Regions U.S. Federal Europe Alternative Fuels Other Total Carrying Value of Goodwill Balance, December 31, 2023 $ 40,681 $ 3,981 $ 13,034 $ — $ 17,891 $ 75,587 Fair value allocation (1,474) — — — 1,474 — Currency effects (102) — (240) — — (342) Balance, June 30, 2024 $ 39,105 $ 3,981 $ 12,794 $ — $ 19,365 $ 75,245
Summary of Gross Carrying Amount and Accumulated Amortization of Intangible Assets	Definite-lived intangible assets, net consisted of the following: As of June 30, 2024 As of December 31, 2023 Gross carrying amount $ 36,928 37,147 Less - accumulated amortization (31,289) (30,339) Intangible assets, net $ 5,639 $ 6,808
Summary of Amortization Expense	The table below sets forth amortization expense: Three Months Ended June 30, Six Months Ended June 30, Asset type Location 2024 2023 2024 2023 All other intangible assets Selling, general and administrative expenses $ 537 $ 689 $ 1,076 $ 991

Energy Assets, Net (Tables)

Energy Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Summary of Energy Assets	Energy assets, net consisted of the following: June 30, 2024 December 31, 2023 Energy assets (1) $ 2,213,897 $ 2,054,145 Less - accumulated depreciation and amortization (400,248) (364,721) Energy assets, net $ 1,813,649 $ 1,689,424 (1) Includes financing lease assets (see Note 7), capitalized interest and asset retirement obligations (“ARO”) assets (see tables below). Also includes the energy asset projects acquired in January 2024. See section below for additional information.
Summary of Depreciation and Amortization Expense of Energy Assets	The following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant and ITC amortization: Three Months Ended June 30, Six Months Ended June 30, Location 2024 2023 2024 2023 Cost of revenues (2) $ 18,561 $ 14,384 $ 35,685 $ 27,725 (2) Includes depreciation and amortization on financing lease assets (see Note 7).
Summary of Capitalized Interest	The following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Capitalized interest $ 15,578 $ 9,642 $ 30,450 $ 16,018
Summary Of Asset And Liabilities Retirement Obligations	The following tables sets forth information related to our ARO assets and ARO liabilities: Location June 30, 2024 December 31, 2023 ARO assets, net Energy assets, net $ 4,551 $ 4,800 ARO liabilities, non-current Other liabilities $ 5,971 $ 5,960 Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Depreciation expense of ARO assets $ 66 $ 53 $ 110 $ 108 Accretion expense of ARO liabilities $ 88 $ 64 $ 154 $ 130

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2024
Leases [Abstract]
Summary of Assets and Liabilities, Lessee	The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: June 30, 2024 December 31, 2023 Operating Leases: Operating lease assets $ 68,194 $ 58,586 Current portions of operating lease liabilities $ 13,618 $ 13,569 Long-term portions of operating lease liabilities 48,545 42,258 Total operating lease liabilities $ 62,163 $ 55,827 Weighted-average remaining lease term 19 years 18 years Weighted-average discount rate 6.6 % 6.6 % Financing Leases: Energy assets $ 26,210 $ 27,262 Current portions of financing lease liabilities $ 683 $ 871 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 12,749 13,057 Total financing lease liabilities $ 13,432 $ 13,928 Weighted-average remaining lease term 12 years 13 years Weighted-average discount rate 12.02 % 12.05 %
Summary of Other Lease Cost Details	The costs related to our leases were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating Leases: Operating lease costs $ 3,176 $ 2,316 $ 6,232 $ 4,436 Financing Leases: Amortization expense 526 525 1,052 1,051 Interest on lease liabilities 389 433 781 877 Total lease costs $ 4,091 $ 3,274 $ 8,065 $ 6,364 Supplemental cash flow information related to our leases was as follows: Six Months Ended June 30, 2024 2023 Cash paid for amounts included in the measurement of operating lease liabilities $ 9,682 $ 3,792 Right-of-use assets (“ROU”) obtained in exchange for new operating lease liabilities (1) $ 13,573 $ 3,486 (1) Includes non-monetary lease transactions of $10,378. See disclosure below for additional information.
Summary of Operating Lease Liability Maturity	The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2024 $ 8,541 $ 1,149 2025 12,674 2,214 2026 7,303 2,054 2027 6,177 1,922 2028 5,155 1,955 Thereafter 61,393 15,934 Total minimum lease payments 101,243 25,228 Less: interest 39,080 11,796 Present value of lease liabilities $ 62,163 $ 13,432
Summary of Finance Lease Liability Maturity	The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2024 $ 8,541 $ 1,149 2025 12,674 2,214 2026 7,303 2,054 2027 6,177 1,922 2028 5,155 1,955 Thereafter 61,393 15,934 Total minimum lease payments 101,243 25,228 Less: interest 39,080 11,796 Present value of lease liabilities $ 62,163 $ 13,432

Debt and Financing Lease Liab_2

Debt and Financing Lease Liabilities (Tables)	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
Summary of Debt and Financing Lease Liabilities	Our debt and financing lease liabilities are comprised of the following: June 30, 2024 December 31, 2023 Senior secured revolving credit facility (1) $ 105,000 $ 140,000 Senior secured term loans 72,500 139,900 Second lien term loan 100,000 — Energy asset construction facilities (2) 427,346 470,248 Energy asset term loans (2) 718,373 564,530 Sale-leasebacks (3) 199,353 185,698 Financing lease liabilities (4) 13,432 13,928 Total debt and financing lease liabilities 1,636,004 1,514,304 Less: current maturities 523,832 322,247 Less: unamortized discount and debt issuance costs 33,177 21,982 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs $ 1,078,995 $ 1,170,075 (1) At June 30, 2024, funds of $81,996 were available for borrowing under this facility. (2) Most of these agreements are now using the Secured Overnight Financing Rate (“SOFR”) as the primary reference rate used to calculate interest. (3) These facilities are accounted for as failed sale leasebacks and are classified as long-term financing facilities. See Note 7 for additional disclosures. (4) Financing lease liabilities are sale-leaseback arrangements under previous guidance. See Note 7 for additional disclosures.

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Summary of Changes in Fair Value by Balance Sheet Grouping	The following table presents the input level used to determine the fair values of our financial instruments measured at fair value on a recurring basis: Fair Value as of Level June 30, 2024 December 31, 2023 Assets: Interest rate swap instruments 2 $ 5,503 $ 3,970 Liabilities: Interest rate swap instruments 2 $ — $ 629 Make-whole provisions 2 12,750 6,012 Contingent consideration 3 1,465 1,465 Total liabilities $ 14,215 $ 8,106
Summary of Changes in Fair Value of Contingent Liabilities Classified as Level 3	The following table sets forth a summary of changes in the fair value of contingent consideration liability classified as level 3: Fair Value as of June 30, 2024 December 31, 2023 Contingent consideration liability balance at the beginning of period $ 1,465 $ 4,158 Changes in fair value included in earnings — 347 Payment of contingent consideration — (3,040) Contingent consideration liability balance at the end of period $ 1,465 $ 1,465
Summary of Fair Value and Carrying Value of Long-Term Debt	The following table sets forth the fair value and the carrying value of our long-term debt, excluding financing leases: As of June 30, 2024 As of December 31, 2023 Fair Value Carrying Value Fair Value Carrying Value Long-term debt (Level 2) $ 1,584,047 $ 1,589,395 $ 1,466,458 $ 1,478,394

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Derivative Instruments	The following table presents information about the fair value amounts of our cash flow derivative instruments: Derivatives as of June 30, 2024 December 31, 2023 Balance Sheet Location Fair Value Fair Value Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 1,853 $ 1,023 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 3,650 $ 2,947 Interest rate swap contracts Other liabilities $ — $ 629 Make-whole provisions Other liabilities $ 12,750 $ 6,012
Summary of Derivative Effect on Consolidated Statements of Income (Loss)	The following table presents information about the effects of our derivative instruments on our condensed consolidated statements of income and condensed consolidated statements of comprehensive income: Amount of (Gain) Loss Recognized in Net Income (Loss) Location of (Gain) Loss Recognized in Net Income (Loss) Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (271) $ (222) $ (547) $ (211) Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (229) $ (338) $ (1,331) $ 182 Make-whole provisions Other expenses, net $ (1,380) $ (86) $ (2,637) $ (443)
Summary of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in Accumulated Other Comprehensive Income (“AOCI”), net of taxes, from our hedging instruments: Six Months Ended June 30, 2024 Derivatives Designated as Hedging Instruments: Accumulated gain in AOCI at the beginning of the period $ 746 Unrealized gain recognized in AOCI 1,161 Gain reclassified from AOCI to other expenses, net (547) Gain on derivatives 614 Accumulated gain in AOCI at the end of the period $ 1,360
Summary of Active Derivative Instruments	The following tables present all of our active derivative instruments as of June 30, 2024: Active Interest Rate Swaps Expiration Date Initial Notional Status 11-Year, 5.77% Fixed October 2029 $ 9,200 Designated 15-Year, 5.24% Fixed June 2033 $ 10,000 Designated 10-Year, 4.74% Fixed December 2027 $ 14,100 Designated 8-Year, 3.49% Fixed June 2028 $ 14,643 Designated 8-Year, 3.49% Fixed June 2028 $ 10,734 Designated 13-Year, 0.72% Fixed March 2033 $ 9,505 Not Designated 13-Year, 0.72% Fixed March 2033 $ 6,968 Not Designated 17.75-Year, 3.16% Fixed December 2040 $ 14,084 Designated 18-Year, 3.81% Fixed July 2041 $ 32,021 Not Designated Other Derivatives Classification Effective Date Expiration Date Fair Value ($) Make-whole provisions Liability June/August 2018 December 2038 $ 241 Make-whole provisions Liability August 2016 April 2031 $ 30 Make-whole provisions Liability April 2017 February 2034 $ 26 Make-whole provisions Liability November 2020 December 2027 $ 24 Make-whole provisions Liability October 2011 May 2028 $ 1 Make-whole provisions Liability May 2021 April 2045 $ 11 Make-whole provisions Liability July 2021 March 2046 $ 2,310 Make-whole provisions Liability June 2022 March 2042 $ 870 Make-whole provisions Liability March 2023 December 2047 $ 1,348 Make-whole provisions Liability April 2024 June 2042 $ 7,390 Make-whole provisions Liability April 2024 June 2042 $ 499

Variable Interest Entities An_2

Variable Interest Entities And Equity Method Investments (Tables)	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Variable Interest Entities	The table below presents a summary of amounts related to our consolidated investment funds and joint ventures, which we determined meet the definition of a variable interest entity (“VIE”), as of: June 30, 2024 (1) December 31, 2023 (1) Investment Funds Other VIEs Total VIEs Investment Funds Other VIEs Total VIEs Cash and cash equivalents $ 2,362 $ 3,421 $ 5,783 $ 5,099 $ 16,780 $ 21,879 Accounts receivable, net — 1,308 1,308 — 1,977 1,977 Costs and estimated earnings in excess of billings 2,417 16,380 18,797 662 13,409 14,071 Prepaid expenses and other current assets 20 2,671 2,691 33 3,749 3,782 Total VIE current assets 4,799 23,780 28,579 5,794 35,915 41,709 Property and equipment, net — — — — 267 267 Energy assets, net 77,425 85,066 162,491 79,104 173,808 252,912 Operating lease assets 4,668 — 4,668 4,748 12,908 17,656 Restricted cash, non-current portion 73 — 73 73 — 73 Other assets 10 558 568 10 74 84 Total VIE assets $ 86,975 $ 109,404 $ 196,379 $ 89,729 $ 222,972 $ 312,701 Current portions of long-term debt and financing lease liabilities $ 2,174 $ — $ 2,174 $ 2,190 $ 132,427 $ 134,617 Accounts payable 1,379 11,635 13,014 1,440 6,490 7,930 Accrued expenses and other current liabilities 222 5,533 5,755 241 22,780 23,021 Current portions of operating lease liabilities 142 — 142 133 6,953 7,086 Total VIE current liabilities 3,917 17,168 21,085 4,004 168,650 172,654 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 16,594 — 16,594 17,167 — 17,167 Long-term operating lease liabilities, net of current portion 5,010 — 5,010 5,063 3,823 8,886 Other liabilities 382 — 382 356 — 356 Total VIE liabilities $ 25,903 $ 17,168 $ 43,071 $ 26,590 $ 172,473 $ 199,063 (1) The amounts in the above table are reflected in Note 1 on our condensed consolidated balance sheets.
Summary of Equity Method Investments	The following table provides information about our equity and cost method investments in joint ventures: As of June 30, 2024 December 31, 2023 Equity and cost method investments $ 12,271 $ 18,709

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2024
Earnings Per Share [Abstract]
Summary of Earnings Per Share, Basic and Diluted	The following is a reconciliation of the numerator and denominator for the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, (In thousands, except per share data) 2024 2023 2024 2023 Numerator: Net income attributable to common shareholders $ 5,010 $ 6,368 $ 2,073 $ 7,470 Adjustment for accretion of tax equity financing fees (27) (28) (54) (55) Income attributable to common shareholders $ 4,983 $ 6,340 $ 2,019 $ 7,415 Denominator: Basic weighted-average shares outstanding 52,355 52,127 52,322 52,045 Effect of dilutive securities: Stock options 758 1,084 694 1,187 Diluted weighted-average shares outstanding 53,113 53,211 53,016 53,232 Net income per share attributable to common shareholders: Basic $ 0.10 $ 0.12 $ 0.04 $ 0.14 Diluted $ 0.09 $ 0.12 $ 0.04 $ 0.14 Potentially dilutive shares (1) 2,228 1,961 2,092 1,939 (1) Potentially dilutive shares attributable to stock options were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Summary of Share-based Compensation Expense	We recorded stock-based compensation expense, including expense related to our employee stock purchase plan, as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Stock-based compensation expense $ 3,678 $ 3,962 $ 6,704 $ 7,999

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Summary of Operational Results by Business Segments	The tables below present our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements: North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Three Months Ended June 30, 2024 Revenues $ 208,131 $ 86,737 $ 73,059 $ 45,852 $ 24,203 $ 437,982 (Gain) loss on derivatives (1,381) (231) — 3 — (1,609) Interest expense, net of interest income 2,514 1,416 858 5,749 — 10,537 Depreciation and amortization of intangible assets 8,796 2,859 514 7,019 716 19,904 Unallocated corporate activity — — — — — (22,632) Income before taxes, excluding unallocated corporate activity 8,843 9,384 1,833 4,846 2,920 27,826 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Three Months Ended June 30, 2023 Revenues $ 151,771 $ 80,019 $ 43,525 $ 30,316 $ 21,443 $ 327,074 (Gain) loss on derivatives (86) 66 — (404) — (424) Interest expense, net of interest income 1,897 288 630 3,436 — 6,251 Depreciation and amortization of intangible assets 7,112 1,235 611 6,204 427 15,589 Unallocated corporate activity — — — — — (17,131) Income before taxes, excluding unallocated corporate activity 11,019 8,887 1,080 3,111 1,452 25,549 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Six months ended June 30, 2024 Revenues $ 346,416 $ 147,627 $ 117,181 $ 78,711 $ 46,453 $ 736,388 Gain on derivatives (2,637) (1,026) — (305) — (3,968) Interest expense, net of interest income 4,211 2,191 1,776 11,431 — 19,609 Depreciation and amortization of intangible assets 16,870 4,875 1,010 14,215 1,312 38,282 Unallocated corporate activity — — — — — (44,775) Income before taxes, excluding unallocated corporate activity 14,436 16,741 1,241 6,022 5,351 43,791 North America Regions U.S. Federal Europe Alternative Fuels All Other Total Consolidated Six Months Ended June 30, 2023 Revenues $ 292,313 $ 139,575 $ 62,621 $ 58,655 $ 44,952 $ 598,116 (Gain) loss on derivatives (381) 4 — 116 — (261) Interest expense, net of interest income 3,482 586 751 5,787 (2) 10,604 Depreciation and amortization of intangible assets 13,565 2,460 785 12,072 558 29,440 Unallocated corporate activity — — — — — (35,974) Income before taxes, excluding unallocated corporate activity 19,269 14,099 1,203 6,626 4,249 45,446

Other Expenses, Net (Tables)

Other Expenses, Net (Tables)	6 Months Ended
	Jun. 30, 2024
Other Income and Expenses [Abstract]
Summary of Other Expenses, Net	The following table presents the components of other expenses, net: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Gain on derivatives $ (1,609) $ (424) $ (3,968) $ (261) Interest expense, net of interest income 14,809 7,222 29,044 14,415 Amortization of debt discount and debt issuance costs 1,340 1,575 2,322 2,365 Foreign currency transaction loss (gain) 546 150 1,678 (7) Government incentives — (577) — (523) Factoring & other fees 673 1,252 854 1,252 Other expenses, net $ 15,759 $ 9,198 $ 29,930 $ 17,241

Assets Held For Sale (Tables)

Assets Held For Sale (Tables)	6 Months Ended
	Jun. 30, 2024
Discontinued Operations and Disposal Groups [Abstract]
Summary of Assets and Liabilities	The table below reflects the assets and liabilities associated with assets held for sale by segment: June 30, 2024 December 31, 2023 North America Regions U.S. Federal Total North America Regions U.S. Federal Total Other assets $ 55,569 $ 42,612 $ 98,181 $ 18,895 $ 18,253 $ 37,148 Operating lease assets 2,599 740 3,339 1,256 — 1,256 Assets classified as held for sale $ 58,168 $ 43,352 $ 101,520 $ 20,151 $ 18,253 $ 38,404 Accounts payable $ 7,713 $ 3,762 $ 11,475 $ 5,418 $ 601 $ 6,019 Accrued expenses and other current liabilities 63 — 63 14 — 14 Billings in excess of cost and estimated earnings — 1,088 1,088 — 1,088 1,088 Long-term operating lease liabilities, net of current portion 2,973 742 3,715 1,230 — 1,230 Liabilities directly associated with assets classified as held for sale $ 10,749 $ 5,592 $ 16,341 $ 6,662 $ 1,689 $ 8,351

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 898	$ 971	$ 903	$ 911
Charges to costs and expenses, net	1,210	486	1,211	579
Account write-offs and other	(48)	(554)	(54)	(587)
Allowance for credit losses, end of period	$ 2,060	$ 903	$ 2,060	$ 903

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Other receivables		$ 17,185	$ 74,454
Deferred project costs		105,746	38,240
Prepaid expenses		11,444	10,697
Prepaid expenses and other current assets	[1]	$ 134,375	$ 123,391
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 437,982	$ 327,074	$ 736,388	$ 598,116
Percentage of revenue recognized over time	96%	95%	95%	94%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 349,500	$ 270,957	$ 588,599	$ 504,041
Canada
Disaggregation of Revenue [Line Items]
Revenues	15,416	13,566	30,596	30,800
Europe
Disaggregation of Revenue [Line Items]
Revenues	73,066	42,551	117,193	63,275
Project revenue
Disaggregation of Revenue [Line Items]
Revenues	330,763	228,887	535,047	412,117
O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	26,170	23,018	51,505	45,276
Energy assets
Disaggregation of Revenue [Line Items]
Revenues	53,416	50,006	96,570	90,778
Other
Disaggregation of Revenue [Line Items]
Revenues	27,633	25,163	53,266	49,945
North America Regions
Disaggregation of Revenue [Line Items]
Revenues	208,131	151,771	346,416	292,313
North America Regions | Project revenue
Disaggregation of Revenue [Line Items]
Revenues	178,742	124,584	294,953	243,815
North America Regions | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	8,511	6,362	15,444	11,901
North America Regions | Energy assets
Disaggregation of Revenue [Line Items]
Revenues	19,746	19,391	33,500	33,798
North America Regions | Other
Disaggregation of Revenue [Line Items]
Revenues	1,132	1,434	2,519	2,799
U.S. Federal
Disaggregation of Revenue [Line Items]
Revenues	86,737	80,019	147,627	139,575
U.S. Federal | Project revenue
Disaggregation of Revenue [Line Items]
Revenues	68,080	63,904	111,559	109,453
U.S. Federal | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	14,628	13,901	29,906	26,601
U.S. Federal | Energy assets
Disaggregation of Revenue [Line Items]
Revenues	3,724	2,164	5,653	3,240
U.S. Federal | Other
Disaggregation of Revenue [Line Items]
Revenues	305	50	509	281
Europe
Disaggregation of Revenue [Line Items]
Revenues	73,059	43,525	117,181	62,621
Europe | Project revenue
Disaggregation of Revenue [Line Items]
Revenues	70,064	40,399	111,488	57,599
Europe | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	895	460	1,642	793
Europe | Energy assets
Disaggregation of Revenue [Line Items]
Revenues	189	452	360	971
Europe | Other
Disaggregation of Revenue [Line Items]
Revenues	1,911	2,214	3,691	3,258
Alternative Fuels
Disaggregation of Revenue [Line Items]
Revenues	45,852	30,316	78,711	58,655
Alternative Fuels | Project revenue
Disaggregation of Revenue [Line Items]
Revenues	13,884	0	17,047	0
Alternative Fuels | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	2,136	2,295	4,513	5,981
Alternative Fuels | Energy assets
Disaggregation of Revenue [Line Items]
Revenues	29,728	28,021	57,028	52,674
Alternative Fuels | Other
Disaggregation of Revenue [Line Items]
Revenues	104	0	123	0
All Other
Disaggregation of Revenue [Line Items]
Revenues	24,203	21,443	46,453	44,952
All Other | Project revenue
Disaggregation of Revenue [Line Items]
Revenues	(7)	0	0	1,250
All Other | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
All Other | Energy assets
Disaggregation of Revenue [Line Items]
Revenues	29	(22)	29	95
All Other | Other
Disaggregation of Revenue [Line Items]
Revenues	$ 24,181	$ 21,465	$ 46,424	$ 43,607

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2024		Dec. 31, 2023		Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 154,665	[1]	$ 153,362	[1]	$ 123,361	$ 174,009
Accounts receivable retainage, net	39,225		33,826		37,803	38,057
Contract Assets:
Costs and estimated earnings in excess of billings	651,748	[1]	636,163	[1]	575,113	576,363
Contract Liabilities:
Billings in excess of cost and estimated earnings	97,493		52,903		40,459	34,796
Billings in excess of cost and estimated earnings, non-current	20,340		18,688		15,659	7,617
Total contract liabilities	$ 117,833		$ 71,591		$ 56,118	$ 42,413
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Contract with customer, asset, reclassified to receivable			$ 494,441,000	$ 436,030,000
Contract with customer, asset, revenue recognized			490,125,000	413,181,000
Revenue recognized			148,279,000	73,585,000
Contract with customer, liability, billings			153,688,000	80,774,000
Revenue, remaining performance obligation	$ 2,836,452,000		$ 2,836,452,000
Contract term			25 years
Capitalized contract cost, project development costs	3,164,000	$ 3,605,000	$ 6,284,000	6,217,000
Capitalized contract cost, impairment loss	$ 0	$ 0	$ 0	$ 0

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01	Jun. 30, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	32%
Revenue, remaining performance obligation, remaining satisfaction	12 months

Business Acquisitions and Rel_3

Business Acquisitions and Related Transactions - Additional Information (Details) - USD ($)				3 Months Ended		6 Months Ended
	Dec. 31, 2023	Mar. 31, 2023	Mar. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Acquisition [Line Items]
Goodwill, net	$ 75,587,000			$ 75,245,000		$ 75,245,000
Enerqos
Business Acquisition [Line Items]
Fair value of consideration	13,445,000	$ 13,445,000	$ 13,445,000
Payments to acquire businesses, gross	9,535,000	9,535,000	9,535,000
Contingent consideration			0
Cash acquired from acquisition			353,000
Long-term debt assumed, net of current portions	3,951,000	3,951,000	3,951,000
Deferred tax liability	931,000	931,000	931,000
Goodwill, net	$ 6,690,000	$ 6,855,000	$ 6,855,000
Revenue				8,855,000	$ 13,041,000	13,033,000	$ 13,041,000
Net income (loss)				$ (989,000)	$ 182,000	$ (1,729,000)	$ 182,000

Business Acquisitions and Rel_4

Business Acquisitions and Related Transactions - Consideration Paid and the Allocation of the Purchase Price (Details) - USD ($) $ in Thousands				9 Months Ended
	Dec. 31, 2023	Mar. 31, 2023	Mar. 30, 2023	Dec. 31, 2023	Jun. 30, 2024
Business Acquisition [Line Items]
Goodwill	$ 75,587			$ 75,587	$ 75,245
Enerqos
Business Acquisition [Line Items]
Cash	9,535	$ 9,535	$ 9,535
Long-term debt assumed, net of current portions	3,951	3,951	3,951
FX adjustment	(41)	(41)
Fair value of consideration transferred	13,445	13,445	13,445
Cash and cash equivalents	190	190		190
Accounts receivable	6,230	6,230		6,230
Costs and estimated earnings in excess of billings	8,985	8,985		8,985
Prepaid expenses and other current assets	16,504	16,504		16,504
Project development costs	5,140	5,140		5,140
Property and equipment and energy assets	1,234	1,234		1,234
Intangible assets	4,438	4,438		4,438
Long-term restricted cash	163	163		163
Accounts payable	(15,480)	(15,480)		(15,480)
Accrued expenses and other current liabilities	(4,345)	(4,510)		(4,345)
Measurement period adjustment, Accrued expenses and other current liabilities				165
Current portions of long-term debt	(15,165)	(15,165)		(15,165)
Deferred income tax liabilities, net	(931)	(931)	(931)	(931)
Other liabilities	(208)	(208)		(208)
Recognized identifiable assets acquired and liabilities assumed	6,755	6,590		6,755
Measurement period adjustment, Recognized identifiable assets acquired and liabilities assumed				165
Goodwill	$ 6,690	$ 6,855	$ 6,855	6,690
Measurement period adjustment, Goodwill				$ (165)

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Additional Information (Details)	Jan. 01, 2024 reporting_unit
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units	2

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Carrying Value of Goodwill
Beginning Balance	$ 75,587
Fair value allocation	0
Currency effects	(342)
Ending Balance	75,245
North America Regions
Carrying Value of Goodwill
Beginning Balance	40,681
Fair value allocation	(1,474)
Currency effects	(102)
Ending Balance	39,105
U.S. Federal
Carrying Value of Goodwill
Beginning Balance	3,981
Fair value allocation	0
Currency effects	0
Ending Balance	3,981
Europe
Carrying Value of Goodwill
Beginning Balance	13,034
Fair value allocation	0
Currency effects	(240)
Ending Balance	12,794
Alternative Fuels
Carrying Value of Goodwill
Beginning Balance	0
Fair value allocation	0
Currency effects	0
Ending Balance	0
Other
Carrying Value of Goodwill
Beginning Balance	17,891
Fair value allocation	1,474
Currency effects	0
Ending Balance	$ 19,365

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount	$ 36,928	$ 37,147
Less - accumulated amortization	(31,289)	(30,339)
Intangible assets, net	$ 5,639	$ 6,808

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets, Net - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Total amortization expense			$ 1,076	$ 991
All other intangible assets
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 537	$ 689	$ 1,076	$ 991

Energy Assets, Net - Energy Ass

Energy Assets, Net - Energy Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Energy assets, net	[1]	$ 1,813,649	$ 1,689,424
Energy Assets
Property, Plant and Equipment [Line Items]
Energy assets		2,213,897	2,054,145
Less - accumulated depreciation and amortization		(400,248)	(364,721)
Energy assets, net		$ 1,813,649	$ 1,689,424
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Energy Assets, Net - August 202

Energy Assets, Net - August 2023 Purchase and Sale Agreement (Details) $ in Thousands					1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 27, 2024 USD ($) energy_asset	Jan. 12, 2024 USD ($)	Dec. 28, 2023 land_lease	Aug. 04, 2023 USD ($)	Jan. 31, 2024 USD ($)	Jun. 30, 2024 USD ($) energy_asset	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Payment on seller's promissory note							$ 29,441	$ 0
Number of land leases acquired | land_lease			4
Number of energy assets disposed of | energy_asset						4
Sale of investment tax credit						$ 23,667
Deposit for sale of investment tax credit	$ 239
Number of additional energy assets disposed of | energy_asset	4
Investment tax credit	$ 23,867
Bright Canyon Corporation
Business Acquisition [Line Items]
Percentage of stock acquired				100%
Asset acquisition, total purchase price		$ 47,956		$ 87,964
Cash payment for asset acquisition		9,839		5,000
Payable to seller		$ 32,500		46,694		$ 4,011	$ 4,011
Asset acquisition, debt assumed				36,270
Cash acquired				$ 11,206
Payment on seller's promissory note					$ 29,441				$ 18,400
Adjustment, consideration transferred					$ 1,147

Energy Assets, Net - Depreciati

Energy Assets, Net - Depreciation and Amortization Expense of Energy Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cost of revenues	$ 18,561	$ 14,384	$ 35,685	$ 27,725

Energy Assets, Net - Capitalize

Energy Assets, Net - Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Capitalized interest	$ 15,578	$ 9,642	$ 30,450	$ 16,018

Energy Assets, Net - Asset And

Energy Assets, Net - Asset And Liabilities Retirement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Business Acquisition [Line Items]
ARO assets, net	$ 4,551		$ 4,551		$ 4,800
ARO liabilities, non-current	5,971		5,971		$ 5,960
Depreciation expense of ARO assets			2,452	$ 1,607
Accretion expense of ARO liabilities	88	$ 64	154	130
ARO Assets
Business Acquisition [Line Items]
Depreciation expense of ARO assets	$ 66	$ 53	$ 110	$ 108

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Operating Leases:
Operating lease assets	[1]	$ 68,194	$ 58,586
Current portions of operating lease liabilities	[1]	13,618	13,569
Long-term portions of operating lease liabilities	[1]	48,545	42,258
Total operating lease liabilities		$ 62,163	$ 55,827
Weighted-average remaining lease term		19 years	18 years
Weighted-average discount rate		6.60%	6.60%
Financing Leases:
Energy assets		$ 26,210	$ 27,262
Current portions of financing lease liabilities		683	871
Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs		12,749	13,057
Total financing lease liabilities		$ 13,432	$ 13,928
Weighted-average remaining lease term		12 years	13 years
Weighted-average discount rate		12.02%	12.05%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Energy assets, net	Energy assets, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Current portions of long-term debt and financing lease liabilities	Current portions of long-term debt and financing lease liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs	Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Leases:
Operating lease costs	$ 3,176	$ 2,316	$ 6,232	$ 4,436
Financing Leases:
Amortization expense	526	525	1,052	1,051
Interest on lease liabilities	389	433	781	877
Total lease costs	$ 4,091	$ 3,274	$ 8,065	$ 6,364

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 9,682	$ 3,792
Right-of-use assets (“ROU”) obtained in exchange for new operating lease liabilities	13,573	$ 3,486
Non-monetary lease transactions	$ 10,378

Leases - Minimum Future Lease O

Leases - Minimum Future Lease Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Operating Leases
2024	$ 8,541
2025	12,674
2026	7,303
2027	6,177
2028	5,155
Thereafter	61,393
Total minimum lease payments	101,243
Less: interest	39,080
Present value of lease liabilities	62,163	$ 55,827
Financing Leases
2024	1,149
2025	2,214
2026	2,054
2027	1,922
2028	1,955
Thereafter	15,934
Total minimum lease payments	25,228
Less: interest	11,796
Present value of lease liabilities	$ 13,432	$ 13,928

Leases - Additional Information

Leases - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) project lease_liability	Jun. 30, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Net present value of commitment	$ 18,859		$ 18,859
Number of lease liabilities | lease_liability			6
Net amortization expense	57	$ 114	$ 57	$ 114
Ground Lease
Lessee, Lease, Description [Line Items]
Net present value of commitment	$ 10,500		$ 10,500
Minimum
Lessee, Lease, Description [Line Items]
Lease term	5 years		5 years
Maximum
Lessee, Lease, Description [Line Items]
Lease term	25 years		25 years
August 2018 Long Term Finance Liability | Solar Photovoltaic Projects
Lessee, Lease, Description [Line Items]
Solar PV projects sold | project			2
Investment fund call option exercise			$ 22,116

Debt and Financing Lease Liab_3

Debt and Financing Lease Liabilities - Summary of Long-term Debt (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Financing lease liabilities		$ 13,432	$ 13,928
Total debt and financing lease liabilities		1,636,004	1,514,304
Less: current maturities		523,832	322,247
Less: unamortized discount and debt issuance costs		33,177	21,982
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs	[1]	1,078,995	1,170,075
Secured Debt | Senior secured term loans
Debt Instrument [Line Items]
Long-term debt, gross		72,500	139,900
Secured Debt | Second lien term loan
Debt Instrument [Line Items]
Long-term debt, gross		100,000	0
Secured Debt | Energy asset term loans
Debt Instrument [Line Items]
Long-term debt, gross		718,373	564,530
Financing Facility | Long-term financing facilities
Debt Instrument [Line Items]
Long-term debt, gross		199,353	185,698
Revolving Senior Secured Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross		105,000	140,000
Funds available for borrowing		81,996
Revolving Credit Facility | Line of Credit | Energy asset construction facilities
Debt Instrument [Line Items]
Long-term debt, gross		$ 427,346	$ 470,248
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Debt and Financing Lease Liab_4

Debt and Financing Lease Liabilities - Additional Information (Details)								1 Months Ended	6 Months Ended		12 Months Ended
	Aug. 02, 2024	Jun. 28, 2024 USD ($)	Apr. 10, 2024 USD ($)	Apr. 05, 2024 USD ($) note project	Feb. 26, 2024 USD ($)	Jan. 12, 2024 USD ($)	Aug. 04, 2023 USD ($)	Jan. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Repayments of long-term line of credit									$ 34,900,000	$ 80,000,000
Payment on seller's promissory note									29,441,000	$ 0
Bright Canyon Corporation
Debt Instrument [Line Items]
Asset acquisition, total purchase price						$ 47,956,000	$ 87,964,000
Cash payment for asset acquisition						9,839,000	5,000,000
Payable to seller						$ 32,500,000	46,694,000		4,011,000
Asset acquisition, debt assumed							$ 36,270,000
Payment on seller's promissory note								$ 29,441,000			$ 18,400,000
Adjustment, consideration transferred								$ 1,147,000
Bright Canyon Corporation | Subsequent Event
Debt Instrument [Line Items]
Fixed interest rate, percentage	5%
Interest rate	9%
Secured Debt | Bright Canyon Corporation
Debt Instrument [Line Items]
Asset acquisition, debt assumed					$ 36,270,000
Short-term debt, outstanding amount									$ 35,696,000
Secured Debt | Bright Canyon Corporation | Secured Overnight Financing Rate (SOFR), 4 Year Term
Debt Instrument [Line Items]
Interest rate					1.635%
Secured Debt | Bright Canyon Corporation | Secured Overnight Financing Rate (SOFR), 2 Year Term
Debt Instrument [Line Items]
Interest rate					1.76%
Revolving Senior Secured Credit Facility | Line of Credit
Debt Instrument [Line Items]
Repayments of long-term line of credit		$ 82,105,000
Senior secured credit facility | Secured Debt
Debt Instrument [Line Items]
Repayments of secured debt		15,000,000	$ 5,000,000
Principal amount			7,500,000
Subordinated debt			$ 100,000,000
Senior Secured Notes, Due June 2042 | Senior Notes
Debt Instrument [Line Items]
Debt issuance costs				$ 1,296,000
Number of notes | note				2
Senior Secured Notes, Due June 2042 | Revolving Credit Facility | Senior Notes
Debt Instrument [Line Items]
Number of instruments held | project				2
Senior Secured Notes, Due June 2042 | Revolving Credit Facility | Senior Notes | Make-whole Provision June 2042 One
Debt Instrument [Line Items]
Notional amount				$ 8,733,000
Senior Secured Notes, Due June 2042 | Revolving Credit Facility | Senior Notes | Make-whole Provision June 2042 Two
Debt Instrument [Line Items]
Notional amount				647,000
Senior Secured Notes, Due June 2042, First Lien | Senior Notes
Debt Instrument [Line Items]
Original principal amount				$ 92,512,000
Fixed interest rate, percentage				6.20%
Proceeds from issuance of senior long-term debt				$ 83,282,000
Senior Secured Notes, Due June 2042, Second Lien | Senior Notes
Debt Instrument [Line Items]
Original principal amount				$ 12,657,000
Fixed interest rate, percentage				8%
Proceeds from issuance of senior long-term debt				$ 12,292,000
Construction Credit Facility, Due August 2026 | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Fixed interest rate, percentage									9.34%
Repayments of long-term line of credit				$ 86,462,000
Proceeds from lines of credit									$ 82,785,000
Line of credit									$ 252,126,000
Second lien term loan | Secured Debt
Debt Instrument [Line Items]
Original principal amount		100,000,000
Debt issuance costs		$ 3,623,000
Interest rate		5.875%
Fixed Rate Note, Due August, 2039 | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Fixed interest rate, percentage									6.70%
Proceeds from lines of credit									$ 38,280,000
Line of credit									$ 373,852,000
Construction Credit Facility, Due August 2024 | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Fixed interest rate, percentage									6.81%
Proceeds from lines of credit									$ 6,429,000
Line of credit									$ 140,506,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 0	$ 5	$ 0	$ (498)
Effective tax rate, percentage	0%	0.10%	0%	(5.30%)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Aug. 04, 2023	Dec. 31, 2021	Oct. 31, 2021	Dec. 31, 2023	Jun. 30, 2024
Loss Contingencies [Line Items]
Liquidated damages up to a maximum amount			$ 89,000
Bright Canyon Corporation
Loss Contingencies [Line Items]
Consideration transferred, contingent consideration	$ 40,000
Contingent consideration, term	7 years
Plug Smart
Loss Contingencies [Line Items]
Contingent consideration, liability, revenue earn-outs, payment period (in years)		5 years
Maximum cumulative earn-out		$ 5,000
Payments of contingent consideration				$ 3,040
Contingent consideration, liability				$ 1,465	$ 1,465

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Liabilities:
Total liabilities	$ 14,215	$ 8,106
Level 2 | Interest rate swap instruments
Assets:
Interest rate swap instruments	5,503	3,970
Liabilities:
Liability derivatives	0	629
Level 2 | Make-whole provisions
Liabilities:
Liability derivatives	12,750	6,012
Level 3
Liabilities:
Contingent consideration	$ 1,465	$ 1,465

Fair Value Measurement - Change

Fair Value Measurement - Changes in Contingent Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration liability balance at the beginning of period	$ 1,465	$ 4,158
Changes in fair value included in earnings	0	347
Payment of contingent consideration	0	(3,040)
Contingent consideration liability balance at the end of period	$ 1,465	$ 1,465

Fair Value Measurement - Fair_2

Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt (Level 2)	$ 1,584,047	$ 1,466,458
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt (Level 2)	$ 1,589,395	$ 1,478,394

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value disclosure, nonrecurring	$ 0	$ 0

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivatives Designated as Hedging Instruments: | Interest rate swap contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 1,853	$ 1,023
Derivatives Not Designated as Hedging Instruments: | Interest rate swap contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	3,650	2,947
Derivatives Not Designated as Hedging Instruments: | Interest rate swap contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	629
Derivatives Not Designated as Hedging Instruments: | Make-whole provisions | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 12,750	$ 6,012

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Additional Information (Details) - derivative_instrument	Jun. 30, 2024	Dec. 31, 2023
Not Designated
Derivative [Line Items]
Number of instruments held	3	3

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effects on Statements of Income (Loss) and Consolidated Statements of Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income (Loss)	$ (1,609)	$ (424)	$ (3,968)	$ (261)
Derivatives Designated as Hedging Instruments: | Other expenses, net | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income (Loss)	(271)	(222)	(547)	(211)
Derivatives Not Designated as Hedging Instruments: | Other expenses, net | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income (Loss)	(229)	(338)	(1,331)	182
Derivatives Not Designated as Hedging Instruments: | Other expenses, net | Make-whole provisions
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income (Loss)	$ (1,380)	$ (86)	$ (2,637)	$ (443)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Effects of Derivative Instruments in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 930,163	$ 894,772	$ 925,886	$ 873,031
Total other comprehensive (loss) income	(114)	1,763	(737)	1,178
Ending balance	941,192	$ 873,983	941,192	$ 873,983
Accumulated Gain (Loss), Net, Cash Flow Hedge
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			746
Unrealized gain recognized in AOCI			1,161
Gain reclassified from AOCI to other expenses, net			(547)
Total other comprehensive (loss) income			614
Ending balance	$ 1,360		$ 1,360

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Active Derivative Instruments (Details)	6 Months Ended
	Jun. 30, 2024 USD ($)
Designated | Interest Rate Swap October 2029
Derivative [Line Items]
Term of contract, years	11 years
Fixed interest rate, percentage	5.77%
Initial Notional Amount ($)	$ 9,200,000
Designated | Interest Rate Swap June 2033
Derivative [Line Items]
Term of contract, years	15 years
Fixed interest rate, percentage	5.24%
Initial Notional Amount ($)	$ 10,000,000
Designated | Interest Rate Swap - December 2027
Derivative [Line Items]
Term of contract, years	10 years
Fixed interest rate, percentage	4.74%
Initial Notional Amount ($)	$ 14,100,000
Designated | Interest Rate Swap - June 2028
Derivative [Line Items]
Term of contract, years	8 years
Fixed interest rate, percentage	3.49%
Initial Notional Amount ($)	$ 14,643,000
Designated | Interest Rate Swap - June 2028
Derivative [Line Items]
Term of contract, years	8 years
Fixed interest rate, percentage	3.49%
Initial Notional Amount ($)	$ 10,734,000
Designated | Interest Rate Swap - December 2040
Derivative [Line Items]
Term of contract, years	17 years 9 months
Fixed interest rate, percentage	3.16%
Initial Notional Amount ($)	$ 14,084,000
Not Designated | Interest Rate Swap March 2033
Derivative [Line Items]
Term of contract, years	13 years
Fixed interest rate, percentage	0.72%
Initial Notional Amount ($)	$ 9,505,000
Not Designated | Interest Rate Swap March 2033
Derivative [Line Items]
Term of contract, years	13 years
Fixed interest rate, percentage	0.72%
Initial Notional Amount ($)	$ 6,968,000
Not Designated | Interest Rate Swap - July 2041
Derivative [Line Items]
Term of contract, years	18 years
Fixed interest rate, percentage	3.81%
Initial Notional Amount ($)	$ 32,021,000
Not Designated | Make-whole Provisions December 2038 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	241,000
Not Designated | Make-whole Provisions April 2031 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	30,000
Not Designated | Make-whole Provisions February 2034 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	26,000
Not Designated | Make-whole Provision December 2027 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	24,000
Not Designated | Make-whole Provision May 2028 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	1,000
Not Designated | Make-whole Provision April 2045 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	11,000
Not Designated | Make-whole Provision March 2046 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	2,310,000
Not Designated | Make-whole Provision March 2042 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	870,000
Not Designated | Make-whole Provision December 2047 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	1,348,000
Not Designated | Make-whole Provision June 2042 One | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	7,390,000
Not Designated | Make-whole Provision June 2042 Two | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	$ 499,000

Variable Interest Entities An_3

Variable Interest Entities And Equity Method Investments - Variable Interest Entity Financial Information (Details) - USD ($) $ in Thousands		Jun. 30, 2024		Dec. 31, 2023		Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	[1]	$ 150,278		$ 79,271
Accounts receivable, net		154,665	[1]	153,362	[1]	$ 123,361	$ 174,009
Costs and estimated earnings in excess of billings		651,748	[1]	636,163	[1]	$ 575,113	$ 576,363
Prepaid expenses and other current assets		11,444		10,697
Total current assets	[1]	1,239,956		1,128,471
Property and equipment, net	[1]	16,995		17,395
Energy assets, net	[1]	1,813,649		1,689,424
Operating lease assets	[1]	68,194		58,586
Restricted cash, non-current portion	[1]	14,740		12,094
Other assets	[1]	148,796		89,735
Total assets	[1]	3,965,102		3,713,776
Current liabilities:
Current portions of long-term debt and financing lease liabilities	[1]	523,832		322,247
Accounts payable	[1]	497,026		402,752
Accrued expenses and other current liabilities	[1]	100,198		108,831
Current portions of operating lease liabilities	[1]	13,618		13,569
Total current liabilities	[1]	1,232,387		901,471
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs	[1]	1,078,995		1,170,075
Long-term operating lease liabilities, net of current portion	[1]	48,545		42,258
Other liabilities	[1]	97,946		82,714
Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents		5,783		21,879
Accounts receivable, net		1,308		1,977
Costs and estimated earnings in excess of billings		18,797		14,071
Prepaid expenses and other current assets		2,691		3,782
Total current assets		28,579		41,709
Property and equipment, net		0		267
Energy assets, net		162,491		252,912
Operating lease assets		4,668		17,656
Restricted cash, non-current portion		73		73
Other assets		568		84
Total assets		196,379		312,701
Current liabilities:
Current portions of long-term debt and financing lease liabilities		2,174		134,617
Accounts payable		13,014		7,930
Accrued expenses and other current liabilities		5,755		23,021
Current portions of operating lease liabilities		142		7,086
Total current liabilities		21,085		172,654
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs		16,594		17,167
Long-term operating lease liabilities, net of current portion		5,010		8,886
Other liabilities		382		356
Total VIE liabilities		43,071		199,063
Variable Interest Entity, Primary Beneficiary | Investment Funds
Current assets:
Cash and cash equivalents		2,362		5,099
Accounts receivable, net		0		0
Costs and estimated earnings in excess of billings		2,417		662
Prepaid expenses and other current assets		20		33
Total current assets		4,799		5,794
Property and equipment, net		0		0
Energy assets, net		77,425		79,104
Operating lease assets		4,668		4,748
Restricted cash, non-current portion		73		73
Other assets		10		10
Total assets		86,975		89,729
Current liabilities:
Current portions of long-term debt and financing lease liabilities		2,174		2,190
Accounts payable		1,379		1,440
Accrued expenses and other current liabilities		222		241
Current portions of operating lease liabilities		142		133
Total current liabilities		3,917		4,004
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs		16,594		17,167
Long-term operating lease liabilities, net of current portion		5,010		5,063
Other liabilities		382		356
Total VIE liabilities		25,903		26,590
Variable Interest Entity, Primary Beneficiary | Other VIEs
Current assets:
Cash and cash equivalents		3,421		16,780
Accounts receivable, net		1,308		1,977
Costs and estimated earnings in excess of billings		16,380		13,409
Prepaid expenses and other current assets		2,671		3,749
Total current assets		23,780		35,915
Property and equipment, net		0		267
Energy assets, net		85,066		173,808
Operating lease assets		0		12,908
Restricted cash, non-current portion		0		0
Other assets		558		74
Total assets		109,404		222,972
Current liabilities:
Current portions of long-term debt and financing lease liabilities		0		132,427
Accounts payable		11,635		6,490
Accrued expenses and other current liabilities		5,533		22,780
Current portions of operating lease liabilities		0		6,953
Total current liabilities		17,168		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		$ 17,168		$ 172,473
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2024 and December 31, 2023 of $196,379 and $312,701, respectively. Includes liabilities of consolidated VIEs at June 30, 2024 and December 31, 2023 of $43,071 and $199,063, respectively. See Note 13.

Variable Interest Entities An_4

Variable Interest Entities And Equity Method Investments - Additional Information (Details) $ in Thousands		6 Months Ended
	Feb. 09, 2024 USD ($)	Jun. 30, 2024 USD ($) joint_venture equity_investment	Jun. 30, 2023 USD ($)
Variable Interest Entity [Line Items]
Join venture for cash		$ 12,956	$ 0
Number of joint ventures | joint_venture		1
Number of equity method investments disposed of | equity_investment		1
Gain on sale of equity method investment		$ 89
Corporate Joint Venture
Variable Interest Entity [Line Items]
Equity method investment ownership percentage disposed of	40%
Join venture for cash	$ 28,864

Variable Interest Entities An_5

Variable Interest Entities And Equity Method Investments - Investment in Joint Ventures (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity and cost method investments	$ 12,271	$ 18,709

Earnings Per Share - Summary of

Earnings Per Share - Summary of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net income attributable to common shareholders	$ 5,010	$ 6,368	$ 2,073	$ 7,470
Adjustment for accretion of tax equity financing fees	(27)	(28)	(54)	(55)
Income attributable to common shareholders	$ 4,983	$ 6,340	$ 2,019	$ 7,415
Denominator:
Basic weighted-average shares outstanding (in shares)	52,355	52,127	52,322	52,045
Effect of dilutive securities:
Stock options (in shares)	758	1,084	694	1,187
Diluted weighted-average shares outstanding (in shares)	53,113	53,211	53,016	53,232
Net income per share attributable to common shareholders:
Basic (in usd per share)	$ 0.10	$ 0.12	$ 0.04	$ 0.14
Diluted (in usd per share)	$ 0.09	$ 0.12	$ 0.04	$ 0.14
Potentially dilutive shares (in shares)	2,228	1,961	2,092	1,939

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 3,678	$ 3,962	$ 6,704	$ 7,999

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options unrecognized compensation expense | $	$ 31,609
2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period (in shares)	554
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period	2 years 1 month 6 days
Stock Options | 2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual period	10 years
Stock options, vesting period	5 years
Restricted Stock Units (RSUs) | 2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)	122

Business Segment Information (D

Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 437,982	$ 327,074	$ 736,388	$ 598,116
(Gain) loss on derivatives	(1,609)	(424)	(3,968)	(261)
Interest expense, net of interest income	10,537	6,251	19,609	10,604
Depreciation and amortization of intangible assets	19,904	15,589	38,282	29,440
Income before taxes, excluding unallocated corporate activity	27,826	25,549	43,791	45,446
North America Regions
Segment Reporting Information [Line Items]
Revenues	208,131	151,771	346,416	292,313
U.S. Federal
Segment Reporting Information [Line Items]
Revenues	86,737	80,019	147,627	139,575
Europe
Segment Reporting Information [Line Items]
Revenues	73,059	43,525	117,181	62,621
Alternative Fuels
Segment Reporting Information [Line Items]
Revenues	45,852	30,316	78,711	58,655
All Other
Segment Reporting Information [Line Items]
Revenues	24,203	21,443	46,453	44,952
Operating Segments | North America Regions
Segment Reporting Information [Line Items]
Revenues	208,131	151,771	346,416	292,313
(Gain) loss on derivatives	(1,381)	(86)	(2,637)	(381)
Interest expense, net of interest income	2,514	1,897	4,211	3,482
Depreciation and amortization of intangible assets	8,796	7,112	16,870	13,565
Income before taxes, excluding unallocated corporate activity	8,843	11,019	14,436	19,269
Operating Segments | U.S. Federal
Segment Reporting Information [Line Items]
Revenues	86,737	80,019	147,627	139,575
(Gain) loss on derivatives	(231)	66	(1,026)	4
Interest expense, net of interest income	1,416	288	2,191	586
Depreciation and amortization of intangible assets	2,859	1,235	4,875	2,460
Income before taxes, excluding unallocated corporate activity	9,384	8,887	16,741	14,099
Operating Segments | Europe
Segment Reporting Information [Line Items]
Revenues	73,059	43,525	117,181	62,621
(Gain) loss on derivatives	0	0	0	0
Interest expense, net of interest income	858	630	1,776	751
Depreciation and amortization of intangible assets	514	611	1,010	785
Income before taxes, excluding unallocated corporate activity	1,833	1,080	1,241	1,203
Operating Segments | Alternative Fuels
Segment Reporting Information [Line Items]
Revenues	45,852	30,316	78,711	58,655
(Gain) loss on derivatives	3	(404)	(305)	116
Interest expense, net of interest income	5,749	3,436	11,431	5,787
Depreciation and amortization of intangible assets	7,019	6,204	14,215	12,072
Income before taxes, excluding unallocated corporate activity	4,846	3,111	6,022	6,626
Operating Segments | All Other
Segment Reporting Information [Line Items]
Revenues	24,203	21,443	46,453	44,952
(Gain) loss on derivatives	0	0	0	0
Interest expense, net of interest income	0	0	0	(2)
Depreciation and amortization of intangible assets	716	427	1,312	558
Income before taxes, excluding unallocated corporate activity	2,920	1,452	5,351	4,249
Unallocated corporate activity
Segment Reporting Information [Line Items]
Unallocated corporate activity	$ (22,632)	$ (17,131)	$ (44,775)	$ (35,974)

Other Expenses, Net (Details)

Other Expenses, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other Income and Expenses [Abstract]
Gain on derivatives	$ (1,609)	$ (424)	$ (3,968)	$ (261)
Interest expense, net of interest income	14,809	7,222	29,044	14,415
Amortization of debt discount and debt issuance costs	1,340	1,575	2,322	2,365
Foreign currency transaction loss (gain)	546	150	1,678	(7)
Government incentives	0	(577)	0	(523)
Factoring & other fees	673	1,252	854	1,252
Other expenses, net	$ 15,759	$ 9,198	$ 29,930	$ 17,241

Assets Held For Sale - Addition

Assets Held For Sale - Additional Information (Details) - Disposal Group, Held-for-Sale, Not Discontinued Operations - Five Energy Asset Projects $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) energy_asset	Dec. 31, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Energy asset projects held for sale | energy_asset	16
Assets held for sale	$ 101,520	$ 38,404
Liabilities held for sale	$ 16,341	$ 8,351

Assets Held For Sale - Assets a

Assets Held For Sale - Assets and Liabilities (Details) - Disposal Group, Held-for-Sale, Not Discontinued Operations - Five Energy Asset Projects - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other assets	$ 98,181	$ 37,148
Operating lease assets	3,339	1,256
Assets classified as held for sale	101,520	38,404
Accounts payable	11,475	6,019
Accrued expenses and other current liabilities	63	14
Billings in excess of cost and estimated earnings	1,088	1,088
Long-term operating lease liabilities, net of current portion	3,715	1,230
Liabilities directly associated with assets classified as held for sale	16,341	8,351
North America Regions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other assets	55,569	18,895
Operating lease assets	2,599	1,256
Assets classified as held for sale	58,168	20,151
Accounts payable	7,713	5,418
Accrued expenses and other current liabilities	63	14
Billings in excess of cost and estimated earnings	0	0
Long-term operating lease liabilities, net of current portion	2,973	1,230
Liabilities directly associated with assets classified as held for sale	10,749	6,662
U.S. Federal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other assets	42,612	18,253
Operating lease assets	740	0
Assets classified as held for sale	43,352	18,253
Accounts payable	3,762	601
Accrued expenses and other current liabilities	0	0
Billings in excess of cost and estimated earnings	1,088	1,088
Long-term operating lease liabilities, net of current portion	742	0
Liabilities directly associated with assets classified as held for sale	$ 5,592	$ 1,689