TECOGEN ADDED TO NEW YORK STATE LIST OF APPROVED DISTRIBUTED GENERATION SUPPLIERS Tecogen's High-Efficiency Cogeneration Units Conform to State's Connectivity Standards WALTHAM, Mass., October 30, 2002 - Tecogen Inc. announced that its 60 kW and 75 kW natural-gas powered cogeneration systems have been added to New York State's "Type Tested and Approved" list of equipment. This list includes all equipment that currently meets the state's standards governing interconnections between non-utility-owned distributed generation and the utility's distribution grid. Distributed generation (DG) refers to small-scale power-generating technologies, such as Tecogen's, that are located at the end-user's site and interconnect with a utility's power distribution grid. In order for a DG customer to set up their on-site system, certain interconnection and operational requirements must be satisfied before the customer is allowed to connect to the grid. "We're very pleased that Tecogen's cogeneration units have been added to the PSC's listing of approved equipment," commented Bob Panora, president and COO of Tecogen. "The 'Type Tested' status will significantly cut down our review time, so this should help us - and our customers - move through the permitting process much more quickly." In the U.S., Tecogen is the leading manufacturer of reliable and efficient low-emission packaged cogeneration units. Based on low-cost, mass-produced internal combustion engines, Tecogen's modular units use natural gas to produce both electricity and process heat right at the customer's facility. With individual ratings in the 60 to 75 kilowatt range, Tecogen's high-efficiency cogeneration modules have been installed singly and in series, providing up to one megawatt of electricity. For more information about the New York State interconnectivity standards, go to http://www.dps.state.ny.us/distgen.htm and select "Standardized Interconnection Requirements." 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 1,200 units, which it supports through an established network of engineering, sales, and service support. Tecogen is based in Waltham, Massachusetts, with annual revenues of approximately $13 million. For more information, go to www.tecogen.com.