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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
Pay vs. Performance Disclosure
|  |  |  |  |  |  |  | Value of Fixed $100 Investment Based On: |  |  |  |
Year | Summary Compensation Table for PEO ($)(1) | Compensation actually paid to PEO($)(2) |  | Average Summary Compensation Table Total Average for Non-PEO NEOs ($)(1) | Average Compensation Actually Paid to Non-PEO NEOs ($)(3) |  |  | Ameresco Total Shareholder Return($)(4) | NASDAQ Clean Edge Total Shareholder Return ($)(4) |  |  | Net Income($) | Adjusted EBITDA ($)(5)
2024 | 1,548,705 | 656,559 |  | 1,290,151 | 948,927 |  |  | 134 | 142 |  |  | 53,940,000 | 225,341,000
2023 | 1,970,680 | (5,388,947) |  | 525,708 | (691,965) |  |  | 181 | 175 |  |  | 63,904,000 | 162,990,000
2022 | 6,498,550 | (5,736,611) |  | 1,332,144 | (741,181) |  |  | 327 | 194 |  |  | 98,549,000 | 204,512,000
2021 | 7,046,400 | 36,700,813 |  | 1,297,940 | 5,164,423 |  |  | 465 | 277 |  |  | 80,191,000 | 152,715,000
2020 | 1,469,973 | 4,286,201 |  | 657,195 | 2,108,713 |  |  | 299 | 285 |  |  | 56,922,000 | 117,877,000
Company Selected Measure Name | Adjusted EBITDA |  |  |  |
Named Executive Officers, Footnote | Our PEO was George Sakellaris for all years in the table. Our non-PEO NEOs for 2020 were Spencer Hole, Michael Bakas, Nicole Bulgarino, and David Corrsin. Our non-PEO NEOs for 2021, 2022, and 2023 were Spencer Hole, Michael Bakas, Nicole Bulgarino, and Britta MacIntosh. Our non-PEO NEOs for 2024 were Spencer Hole, Michael Bakas, Nicole Bulgarino, Mark Chiplock, and Lou Maltezos. |  |  |  |
Peer Group Issuers, Footnote | Cumulative total shareholder return (TSR) calculated based on an assumed $100 investment as of December 31, 2019. The peer group TSR reflects the TSR of the NASDAQ Clean Edge Green Energy Index. |  |  |  |
PEO Total Compensation Amount | $ 1,548,705 | $ 1,970,680 | $ 6,498,550 | $ 7,046,400 | $ 1,469,973
PEO Actually Paid Compensation Amount | $ 656,559 | (5,388,947) | (5,736,611) | 36,700,813 | 4,286,201
Adjustment To PEO Compensation, Footnote | The dollar amounts reported in this column represent the amount of “compensation actually paid” to the PEO in 2024, 2023, 2022, 2021 and 2020. The following table describes the adjustments, each of which is prescribed by SEC rule, to calculate the CAP amounts from the Summary Compensation Table amounts. The Summary Compensation Table amounts and the CAP amounts do not reflect the actual amount of compensation earned by or paid to our PEO during the applicable years, but rather are amounts determined in accordance with Item 402 of Regulation S-K under the Exchange Act. Equity compensation fair value was calculated based on assumptions determined in accordance with FASB ASC Topic 718. Valuation assumptions used to calculate fair values did not materially differ from those used to calculate fair values at the time of grant as reflected in the Summary Compensation Table Amounts.
PEO Compensation Actually Paid Detail
| Compensation Actually Paid Detail |  |
Compensation Element | 2020($) | 2021($) | 2022($) | 2023($) | 2024($)
Summary Compensation Table (SCT) Reported Total Compensation | 1,469,973 | 7,046,400 | 6,498,550 | 1,970,680 | 1,548,705
Aggregate SCT Reported Equity Compensation (-) | — | (5,233,075) | (5,043,613) | (424,467) | —
Year-End Fair Value of Awards Granted During the FY & Outstanding (+) | — | 12,229,652 | 3,308,244 | 233,630 | —
Year-Over-Year Change in Fair Value of Awards Granted During Previous FYs & Outstanding (+/-) | 2,842,726 | 22,831,678 | (4,451,061) | (6,491,933) | (391,335)
Vesting Date Fair Value of Awards Granted & Vested During the Covered FY (+) | — | — | — | 115,005 | —
Year-Over-Year Change in Fair Value of Awards Granted During Previous FYs & Vesting During Covered FY (+/-) | (26,498) | (173,842) | (6,048,731) | (791,862) | (500,811)
Prior FYE Value of Awards Determined to Fail to Meet Vesting Conditions During Covered FY (-) | — | — | — | — | —
Compensation Actually Paid Determination | 4,286,201 | 36,700,813 | (5,736,611) | (5,388,947) | 656,559
Non-PEO NEO Average Total Compensation Amount | $ 1,290,151 | 525,708 | 1,332,144 | 1,297,940 | 657,195
Non-PEO NEO Average Compensation Actually Paid Amount | $ 948,927 | (691,965) | (741,181) | 5,164,423 | 2,108,713
Adjustment to Non-PEO NEO Compensation Footnote | The dollar amounts reported in this column represent the average amount of “compensation actually paid” to the non-PEO NEOs in 2024, 2023, 2022, 2021 and 2020. The following table describes the adjustments, each of which is prescribed by SEC rule, to calculate the CAP amounts from the Summary Compensation Table Amounts. The Summary Compensation Table amounts and the CAP amounts do not reflect the actual amount of compensation earned by or paid to our non-PEO NEOs during the applicable years, but rather are amounts determined in accordance with Item 402 of Regulation S-K under the Exchange Act. Equity compensation fair value was calculated based on assumptions determined in accordance with FASB ASC Topic 718. Valuation assumptions used to calculate fair values did not materially differ from those used to calculate fair values at the time of grant as reflected in the Summary Compensation Table Amounts.
Average Non-PEO NEOs Compensation Actually Paid Detail
| Compensation Actually Paid Detail |  |
Compensation Element | 2020($) | 2021($) | 2022($) | 2023($) | 2024($)
Summary Compensation Table (SCT) Reported Total Compensation | 657,195 | 1,297,940 | 1,332,144 | 525,708 | 1,290,151
Aggregate SCT Reported Equity Compensation (-) | (169,236) | (761,219) | (879,966) | (50,917) | (805,848)
Year-End Fair Value of Awards Granted During the FY & Outstanding (+) | 586,026 | 1,622,442 | 696,792 | 28,028 | 651,907
Year-Over-Year Change in Fair Value of Awards Granted During Previous FYs & Outstanding (+/-) | 985,989 | 2,990,380 | (969,267) | (1,063,898) | (82,877)
Vesting Date Fair Value of Awards Granted & Vested During the Covered FY (+) | — | — | — | 13,791 | —
Year-Over-Year Change in Fair Value of Awards Granted During Previous FYs & Vesting During Covered FY (+/-) | 48,739 | 14,880 | (920,884) | (144,677) | (84,501)
Prior FYE Value of Awards Determined to Fail to Meet Vesting Conditions During Covered FY (-) | — | — | — | — | (19,905)
Compensation Actually Paid Determination | 2,108,713 | 5,164,423 | (741,181) | (691,965) | 948,927
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |  |
Tabular List, Table |
Revenue
Adjusted EBITDA
Business Development - Sales and Awards (Project Sales, Distributed Generation EPC/PPA Sales, Project Solution Awards)
Energy Assets Placed into Operation
Total Shareholder Return Amount | $ 134 | 181 | 327 | 465 | 299
Peer Group Total Shareholder Return Amount | 142 | 175 | 194 | 277 | 285
Net Income (Loss) | $ 53,940,000 | $ 63,904,000 | $ 98,549,000 | $ 80,191,000 | $ 56,922,000
Company Selected Measure Amount | 225,341,000 | 162,990,000 | 204,512,000 | 152,715,000 | 117,877,000
PEO Name | George Sakellaris |  |  |  |
Additional 402(v) Disclosure | The compensation committee considers a mix of cash and equity awards over both the short-term and long-term as a critical balance in reinforcing Ameresco’s commitment to performance alignment. Our compensation programs are focused on objective corporate performance measures and individual performance. In accordance with SEC rules, we are providing the below disclosure regarding certain executive compensation disclosure for our principal executive officer and our other NEOs (“Non-PEO NEOs;”) and certain financial performance measures for the fiscal years listed below, as well as the relationship of the “compensation actually paid” (“CAP”) to those financial performance measures. The SEC-defined CAP data set forth in the table below does not reflect amounts actually realized by our NEOs. A significant portion of the CAP amounts shown relate to changes in values of unvested awards over the course of the reporting year. These unvested awards remain subject to significant risk from forfeiture conditions and possible future declines in value based on changes in our stock price. As described in detail in the “Compensation Discussion and Analysis” section above, our performance equity awards are subject to multi-year performance conditions tied to performance metrics and all our equity awards are subject to time vesting conditions. The ultimate values actually realized by our NEOs from unvested equity awards, if any, will not be determined until the awards fully vest. Performance Metrics to Link Executive Compensation Actually Paid with Company Performance The following table presents the most important financial measures that we used to link compensation actually paid with Ameresco performance during the most recently completed fiscal year: The following charts show the relationship of the CAP amounts for our PEO and Non-PEO NEOs as compared to Ameresco’s total shareholder return, the Nasdaq Clean Edge Green Energy Index total shareholder return, net income, and adjusted EBITDA over the last five completed fiscal years. See the “Compensation Discussion & Analysis” above and published in our historical proxy statements for additional detail on executive compensation actions. Note, the value ultimately realized by our executive officers is subject to significant variation over time (e.g., forfeiture of unvested awards prior to vesting, variation in stock price prior to award monetization). |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Revenue |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Adjusted EBITDA |  |  |  |
Non-GAAP Measure Description | Adjusted EBITDA is defined as net income attributable to common shareholders, including impact from redeemable non-controlling interests, before provision (benefit from) income tax provisions, other expenses net, depreciation, amortization of intangible assets, accretion of asset retirement obligations, contingent consideration expense, stock-based compensation expense, energy asset impairment, restructuring and other charges, gain or loss on sale of equity investment, and gain or loss upon deconsolidation of a variable interest entity. |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Business Development - Sales and Awards (Project Sales, Distributed Generation EPC/PPA Sales, Project Solution Awards) |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Energy Assets Placed into Operation |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 0 | $ (424,467) | $ (5,043,613) | $ (5,233,075) | $ 0
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 233,630 | 3,308,244 | 12,229,652 | 0
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (391,335) | (6,491,933) | (4,451,061) | 22,831,678 | 2,842,726
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 115,005 | 0 | 0 | 0
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (500,811) | (791,862) | (6,048,731) | (173,842) | (26,498)
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0 | 0
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (805,848) | (50,917) | (879,966) | (761,219) | (169,236)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 651,907 | 28,028 | 696,792 | 1,622,442 | 586,026
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (82,877) | (1,063,898) | (969,267) | 2,990,380 | 985,989
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 13,791 | 0 | 0 | 0
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (84,501) | (144,677) | (920,884) | 14,880 | 48,739
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (19,905) | $ 0 | $ 0 | $ 0 | $ 0

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