Exhibit 32.1
CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT
TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
In connection with the Annual Report on Form 10-K of Ameresco, Inc. (the “Company”) to which this certification is attached and as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company hereby certifies, pursuant to Rule 13a-14(b) and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)
 
The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
 
 
 
(2)
 
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
 
 
 
 
 
 
 
 
Date: March 4, 2020
/s/ George P. Sakellaris
 
 
George P. Sakellaris
 
 
President and Chief Executive Officer
(principal executive officer)
 
 
Date: March 4, 2020
/s/ Spencer Doran Hole
 
Spencer Doran Hole
 
Senior Vice President and Chief Financial Officer
(Principal Financial Officer)