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<title>Ameresco, Inc. Annual report pursuant to Section 13 and 15(d)</title>
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    <h3>Annual report pursuant to Section 13 and 15(d)</h3>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1851">Cover</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1851">Document and Entity Information</a></li>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1852">Financial Statements</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1852">Consolidated Balance Sheets</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1853">Consolidated Balance Sheets (Parenthetical)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1854">Consolidated Statements of Income (Loss)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1855">Consolidated Statements of Comprehensive Income (Loss)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1856">Consolidated Statement of Comprehensive Income (Loss) (Parenthetical)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1857">Consolidated Statements of Changes in Redeemable Non-controlling Interests and Stockholders' Equity</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1858">Consolidated Statements of Changes in Redeemable Non-controlling Interests and Stockholders' Equity (Parenthetical)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1859">Consolidated Statements of Cash Flows</a></li>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1860">Notes to Financial Statements</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1860">Description of Business</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1861">Summary of Significant Accounting Policies</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1862">Revenue from Contracts with Customers</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1863">Business Acquisitions and Related Transactions</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1864">Goodwill and Intangible Assets</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1865">Property and Equipment</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1866">Energy Assets</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1867">Long-Term Debt</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1868">Income Taxes</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1869">Investment Funds</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1870">Non-Controlling Interests and Equity</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1871">Stock Incentive Plan</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1872">Employee Benefits</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1873">Commitments and Contingencies</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1874">Geographic Information</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1875">Other Expenses, Net</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1876">Fair Value Measurement</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1877">Derivative Instruments and Hedging Activities</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1878">Business Segment Information</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1879">Quarterly Information (Unaudited)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1880">Subsequent Events</a></li>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1881">Accounting Policies</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1881">Summary of Significant Accounting Policies (Policies)</a></li>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1882">Notes Tables</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1882">Summary of Significant Accounting Policies (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1883">Revenue from Contracts with Customers (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1884">Business Acquisitions and Related Transactions (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1885">Goodwill and Intangible Assets (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1886">Property and Equipment (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1887">Energy Assets (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1888">Long-Term Debt (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1889">Income Taxes (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1890">Investment Funds (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1891">Stock Incentive Plan (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1892">Commitments and Contingencies (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1893">Geographic Information (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1894">Other Expenses, Net (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1895">Fair Value Measurement (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1896">Derivative Instruments and Hedging Activities (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1897">Business Segment Information (Tables)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1898">Quarterly Information (Unaudited) (Tables)</a></li>
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                        <a class="menu-item current" href="/sec-filings/all-sec-filings/xbrl_doc_only/1899">Notes Details</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1899">Summary of Significant Accounting Policies - Principles of Consolidation (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1900">Summary of Significant Accounting Policies - Use of Estimates (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1901">Summary of Significant Accounting Policies - Restricted Cash  (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1902">Summary of Significant Accounting Policies - Accounts Receivable (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1903">Summary of Significant Accounting Policies - Project Development Costs  (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1904">Summary of Significant Accounting Policies - Property and Equipment (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1905">Summary of Significant Accounting Policies - Energy Assets (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1906">Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1907">Summary of Significant Accounting Policies - Sales Leaseback (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1908">Summary of Significant Accounting Policies - Amounts Related to Sale Leaseback (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1909">Summary of Significant Accounting Policies - Revenue Recognition (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1910">Summary of Significant Accounting Policies - Stock-Based Compensation Expense (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1911">Summary of Significant Accounting Policies - Fair Value Measurements  (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1912">Summary of Significant Accounting Policies - Share Repurchase Program (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1913">Summary of Significant Accounting Policies - Earnings Per Share (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1914">Summary of Significant Accounting Policies - Derivative Instruments (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1915">Summary of Significant Accounting Policies - Redeemable Non-Controlling Interest (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1916">Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1917">Revenue from Contracts with Customers - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1918">Revenue from Contracts with Customers - Summary of Impact of Adoption (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1919">Revenue from Contracts with Customers - Disaggregation of Revenue (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1920">Revenue from Contracts with Customers - Contract Balances (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1921">Business Acquisitions and Related Transactions - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1922">Business Acquisitions and Related Transactions - Purchase Price Allocation (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1923">Goodwill and Intangible Assets - Goodwill (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1924">Goodwill and Intangible Assets - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1925">Goodwill and Intangible Assets - Intangible Assets (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1926">Goodwill and Intangible Assets - Amortization (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1927">Goodwill and Intangible Assets - Future Amortization (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1928">Property and Equipment (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1929">Energy Assets - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1930">Long-Term Debt - Schedule of Long-Term Debt (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1931">Long-Term Debt - Schedule of Maturities (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1932">Long-Term Debt - Senior Secured Credit Facility - Revolver and Term Loan (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1933">Long-Term Debt - Construction and Term Loans (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1934">Income Taxes - Domestic and foreign income taxes (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1935">Income Taxes - Income tax provision (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1936">Income Taxes - Deferred income tax assets and liabilities (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1937">Income Taxes - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1938">Income Taxes - Reconciliation of Effective Tax Rates (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1939">Income Taxes - Unrecognized Tax Benefits (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1940">Investment Funds (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1941">Non-Controlling Interests and Equity (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1942">Stock Incentive Plan - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1943">Stock Incentive Plan - Stock Options Activity (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1944">Stock Incentive Plan - Fair Value Assumptions (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1945">Employee Benefits (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1946">Commitments and Contingencies - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1947">Commitments and Contingencies - Operating Leases (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1948">Geographic Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1949">Other Expenses, Net (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1950">Other Expenses, Net - Deferred Financing Costs (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1951">Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1952">Fair Value Measurement - Fair Value of Contingent Liabilities (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1953">Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1954">Fair Value Measurement - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1955">Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1956">Derivative Instruments and Hedging Activities - Effects on statements of income and consolidated statements of comprehensive income (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1957">Derivative Instruments and Hedging Activities - Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1958">Derivative Instruments and Hedging Activities - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1959">Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1960">Business Segment Information - Additional Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1961">Business Segment Information - Segment Information (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1962">Business Segment Information - Revenue (Details)</a></li>
                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1963">Quarterly Information (Unaudited) (Details)</a></li>
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                        <a class="menu-item " href="/sec-filings/all-sec-filings/xbrl_doc_only/1964">Uncategorized</a>
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                                                            <li><a href="/sec-filings/all-sec-filings/xbrl_doc_only/1964">Uncategorized Items - amrc-20181231.xml</a></li>
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        <h4>Income Taxes - Domestic and foreign income taxes (Details)</h4>
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