POWER OF ATORNEY

Know All Men By These Presents, that the undersigned hereby constitutes
and appoints David Garrison, the undersigned's true and lawful attorney-in-fact to:

(1)    execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of Tecogen Inc. (the "Company"), Forms 3, 4, 5,
or Form ID in accordance with Section 16 of the Securities Exchange Act of 1934 and the
rules thereunder ("Section 16");

(2)    do and perform any and all acts for and on behalf of the undersigned which may
be necessary or desirable to complete and execute any such Form 3, 4, 5, or Form ID complete
and execute any amendment or amendments  thereto, and timely file such form or forms with the
United Sates Securities and Exchange Commission and any stock exchange or similar authority; and

(3)    take any other action of any type whatsoever in connection with the foregoing that, 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 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 attorney-in-fact, in serving in such capacity at the request
of the undersigned, is not assuming, nor is the Company assuming, any of the undersigned's responsibilities
to comply with Section 16.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required
to file Forms 3, 4, 5, and Form ID 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
attorneys-in-fact.

In WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17th day of
November, 2014.

/s/ Benjamin Locke
Benjamin M. Locke
Co-CEO