Tecogen Cogeneration Systems Purchased by American DG Energy

Tecogen CHP System

WALTHAM, MA, May 24, 2012 —Tecogen Inc. today announced that American DG Energy Inc. (NYSE Amex: ADGE) has purchased 13 Tecogen combined heat and power (CHP) units for use in a variety of new energy production projects announced earlier this month by ADGE. The Tecogen systems comprise eight CM-75 (75 kW) and five InVerde (100 kW) units.

“Tecogen was the natural choice for our clients,” said Barry Sanders, president and chief operating officer of American DG Energy. “Tecogen is the pre-eminent bridge to a sustainable energy future, whose products are proven, cost-effective and environmentally responsible.”

Six of the CM-75 units will comprise a cogeneration plant to be placed at Tracy Towers residential apartment complex in New York. One CM-75 unit will be providing electricity, domestic hot water, space heating and pool heating to the Greenwich YMCA in Connecticut. Another CM-75 unit will be sited at the West Village Apartments in Connecticut. The five InVerde units will be installed in the United Kingdom by EuroSite Power, a European subsidiary of American DG Energy.

About Tecogen Inc.
Tecogen manufactures highly efficient, ultra-clean Combined Heat and Power products including natural gas engine-driven cogeneration, air conditioning systems, and high-efficiency water heaters for industrial and commercial use. Tecogen has an installed base of more than 2,100 units, supported by an established network of engineering, sales, and service personnel across the United States. For more information, please visit www.tecogen.com.

FORWARD-LOOKING STATEMENTS
This press release contains forward-looking statements under the Private Securities Litigation Reform Act of 1995 that involve a number of risks and uncertainties. Important factors could cause actual results to differ materially from those indicated by such forward-looking statements, as disclosed on the Company’s website and in Securities and Exchange Commission filings. The statements in this press release are made as of the date of this press release, even if subsequently made available by the Company on its website or otherwise. The Company does not assume any obligation to update the forward-looking statements provided to reflect events that occur or circumstances that exist after the date on which they were made.

Tecogen Media Contact Information:
Melinda M. Furse
Tecogen Inc.
P: 781-466-6444
E: melinda.furse@tecogen.com

Tecogen Investor Contact Information:
John N. Hatsopoulos
P: 781-622-1120
E: jhatsopoulos@tecogen.com

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