Know all by these presents, that the undersigned hereby makes, constitutes and appoints each of David J.
Corrsin and John W. Pickett, signing singly and each acting individually, as the undersigned's true and lawful
attorney-in-fact with full power and authority as hereinafter described to:

       (1)    execute for and on behalf of the undersigned, in the undersigned's capacity as a Director of
Ameresco, Inc. (the "Company"), Forms 3, 4, and 5 (including any amendments thereto) in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder (the "Exchange Act");

       (2)    do and perform any and all acts for and on behalf of the undersigned which may be necessary or
desirable to prepare, complete and execute any such Form 3, 4, or 5, prepare, complete and execute any
amendment or amendments thereto, and timely deliver and file such form with the United States Securities and
Exchange Commission (the "SEC") and any stock exchange or similar authority, including without limitation the
filing of a Form ID or any other application materials to enable the undersigned to gain or maintain access to the
Electronic Data Gathering, Analysis and Retrieval system of the SEC;

       (3)    seek or obtain, as the undersigned's representative and on the undersigned's behalf, information
regarding transactions in the Company's securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such third party to release any such
information to the herein appointed attorney-in-fact and approves and ratifies any such release of information; and

       (4)    take any other action of any type whatsoever in connection with the foregoing which, in the
opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions
as such attorney-in-fact may approve in such attorney-in-fact's discretion.

       The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform
any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue
of this power of attorney and the rights and powers herein granted.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming nor
relieving, nor is the Company assuming nor relieving, any of the undersigned's responsibilities to comply with
Section 16 of the Exchange Act.  The undersigned acknowledges that neither the Company nor the foregoing
attorneys-in-fact assume (i) any liability for the undersigned's responsibility to comply with the requirement of
the Exchange Act, (ii) any liability of the undersigned for any failure to comply with such requirements, or (iii)
any obligation or liability of the undersigned for profit disgorgement under Section 16(b) of the Exchange Act.

       This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to
file Forms 3, 4, and 5 with the SEC with respect to the undersigned's holdings of and transactions in securities
issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 21st day
of July, 2021.

/s/ Claire D'Oyly-Hughes Johnson
Claire D'Oyly-Hughes Johnson