Exhibit 24.3
POWER OF ATTORNEY
KNOW ALL
MEN BY THESE PRESENTS, that I, Douglas I. Foy, a director of Ameresco, Inc. (the
Company) constitute and appoint George P. Sakellaris, David J. Corrsin and Andrew B. Spence, and
each of them, my true and lawful attorneys-in-fact and agents, with full power of substitution and
resubstitution for me and in my name, place and stead, in any and all capacities, to sign any and
all amendments (including post-effective amendments) to the Companys Registration Statement on
Form S-1, File No. 333-165821, under the Securities Act of 1933 in connection with the Companys
initial public offering and any subsequent registration statements pursuant to Rule 462 of the
Securities Act and to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all intents and purposes
as I might or could do in person, hereby ratifying and confirming all that each of said
attorneys-in-fact or his or their substitute or substitutes, may lawfully do or cause to be done
by virtue hereof.
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Signature |
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Title |
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Date |
/s/ Douglas I. Foy
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Director
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June 12, 2010 |
Douglas I. Foy |
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