July 20, 2010

BY ELECTRONIC SUBMISSION

U.S. Securities and Exchange Commission
Division of Corporate Finance
100 F Street, N.E.
Washington, DC 20549
Attn: Hagen Ganem

Re:

Ameresco, Inc. Registration Statement on Form S-1 Filed March 31, 2010 File No. 333-165821

Ladies and Gentlemen:

Submitted herewith for filing on behalf of Ameresco, Inc. (the “Company”) is Amendment No. 6 to the Registration Statement referenced above.

Please contact the undersigned (617-526-6421) or Ian Kaminski (617-526-6989) with any questions or comments you may have regarding this filing.

Very truly yours,

/s/ Jason L. Kropp
Jason L. Kropp