TECOGEN'S DISTRIBUTED GENERATION PRODUCT LINE MEETS NEW STANDARD Tecogen's High-Efficiency Products Conform with IEEE P1547 -- the New Standard for Distributed Generation Connectivity WALTHAM, Mass., July 31, 2002 - Tecogen Inc. announced that its 60 kW and 75 kW natural-gas powered cogeneration systems will meet a new standard governing interconnections between non-utility-owned distributed generation and the 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. Known in its draft form as IEEE P1547/D07, the new standard should help ease some of the permitting difficulties that DG manufacturers have faced in the past. ITS ETL Semko, a worldwide accredited testing, inspection, and certification organization, performed the compliance testing and specification review for Tecogen. In order for a DG customer to set up their on-site system, numerous interconnection and liability requirements must be satisfied before the customer is allowed to connect to the grid. According to the U.S. Department of Energy's Distributed Power Program, "These requirements have been designed to ensure that [DG] systems operate safely and reliably with the distribution system, but they have evolved to be sufficiently complex and burdensome." "The importance of this new standard cannot be overstated," commented Bob Panora, president and COO of Tecogen. "We expect that it will help ease what has typically been a very difficult, very onerous permitting step. Overcoming that hurdle should help drive robust growth in the DG market in the coming years." Testing and Specifications The Tecogen systems that were tested for compliance use an induction generator, requiring conformance to only certain sections of P1547. In some sections, it was necessary to administer a test to a product sample, while other sections required a specification review only. Listed below are the applicable sections of compliance to P1547, as well as the inclusive compliance to other established standards: 4.1.2 Integration with Area Electric Power System Grounding 4.1.4 Distributed Resources on Distribution Secondary Grid and Spot Networks 4.1.5.1 Inadvertent Energization 4.1.5.2 Reconnection after Area EPS Outage 4.1.6 Monitoring 4.1.7 Isolation Device 4.2.1 Voltage Disturbances - Tested 4.2.2 Frequency Disturbances - Tested 4.2.3 Disconnection for Faults 4.2.5 Feeder Reclosing Coordination 4.3.2 Limitation of Voltage Flicker Induced by the DR - Tested to EN61000-3-3 4.3.3 Harmonics - Tested to EN-61000-3-2 4.3.4 Immunity Protection - Tested to IEEE C37-90.2-1995 4.3.5 Surge Capability - Tested to IEEE C37-90.1-1989 & ANSI 62.41 About Tecogen Tecogen Inc. operates in the distributed generation market and is a leading manufacturer of natural gas-fueled commercial cooling and heat-recovery 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.