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Exhibit 23.1 <br />Consent of Independent Registered Public Accounting Firm <br />We consent to the incorporation by reference in the Registration Statements (Nos. 333-238792, 333-226698, 333-219864, 333-174507 and 333-169100) on Form S-8 of <br />Ameresco, Inc. of our report dated February 29, 2024, relating to the consolidated financial statements and the effectiveness of internal control over financial reporting of <br />Ameresco, Inc., appearing in this Annual Report on Form 10-K of Ameresco, Inc. for the year ended December 31, 2023. <br />/s/ RSM US LLP <br />Boston, Massachusetts <br />February 29, 2024 <br />