Tecogen Files Summary Judgment Motion In
Pending Lawsuit Against Aegis Energy

Premuim Power Module CM-100 Delivers

Waltham, MA - July 23, 2008- Tecogen Inc., the leading manufacturer of small natural gas-driven cogeneration modules, announced it has filed a motion for summary judgment in a pending suit filed in the U.S. District Court of Massachusetts against Aegis Energy Services, Inc. and Aegenco, Inc. (together, Aegis Energy). This motion requests that the court grant Tecogen summary judgment on every counterclaim Aegis Energy has filed against Tecogen in the lawsuit.

"Tecogen believes we have a very good chance of winning this motion," said Robert Panora, president of Tecogen. "However, regardless of the outcome of this motion, we are ready to pursue trial on Tecogen's claims against Aegis."

Tecogen's claims against Aegis Energy in the pending suit center on allegations that Aegis Energy took advantage of its position as a Tecogen distributor to secretly copy Tecogen's product designs and other intellectual property to create and sell "knock-off" modules in place of Tecogen's modules. Mr. Panora commented, "We are continuing to vigorously pursue the remaining claims in order to protect years of R&D and innovation that produced the CM-60 TECOGEN^® unit and the CM-75 High Output unit, which have earned Tecogen its reputation as an innovative and dependable supplier of cogeneration technology

"Tecogen initially designed its CM-60 TECOGEN^® unit in 1977. By 1987, one million total run hours were logged on Tecogen units at actual customer sites. A year later, the company introduced the CM-75 High Output unit. In 1990, the company sold its first low-emissions module in Southern California, followed by the introduction of the TecoNet(TM) state-of the-art microprocessor control system in 1998. In 2002, the company's cogeneration modules were certified by ITS/ETL Semko, an OSHA-approved NRTL (Nationally Recognized Testing Laboratory for product safety certification), to be in compliance with national IEEE P1547/DO7standards, "type-tested and approved" under NY State Interconnection Requirement, and successfully completed testing for compliance with California's Rule 21.

About Tecogen
Tecogen Inc. operates in the distributed generation market and is a leading manufacturer of natural gas fueled commercial and industrial cooling and cogeneration systems. Tecogen has an installed base of more than 1,800 units, which it supports through an established network of engineering, sales, and service support. Tecogen is based in Waltham, Massachusetts with service centers located in seven regions of the United States. For more information, please visit www.tecogen.com.