TECOGEN'S CHILLERS PROVIDE ALTERNATIVE SOURCE OF COOLING FOR "HYBRID" PLANT AT THE UNIVERSITY OF CONNECTICUT Tecogen Chillers Run on Natural Gas to Offer Maximum Flexibility and Help UCONN Reduce Energy Costs WALTHAM, Mass., October 1, 2001 - Tecogen, a leading manufacturer of commercial and industrial natural gas-powered air-conditioners, has supplied several large-capacity TECOCHILL® cooling systems for the University of Connecticut's innovative Hybrid Chiller Plant. Part of a multimillion-dollar capital improvement campaign called UCONN 2000, the hybrid plant allows the university to alternate between different energy sources - such as electricity and natural gas - using whichever source is the most cost-effective at a given time. The university's new centralized plant provides cooling for classrooms, offices, residence halls, and research centers throughout the main campus in Storrs, Connecticut. "After looking at several technology options, we chose TECOCHILL because it had a higher coefficient of performance than other systems we evaluated," explains Al Lewandowski, energy manager for the University of Connecticut. "When we started planning the plant in 1996, we knew electric deregulation was on the horizon. We felt that a hybrid plant would be the optimum solution for controlling the university's cooling costs." The Hybrid Chiller Plant combines two large-scale gas-powered chillers from Tecogen (1,000-ton cooling capacity each) with two comparable electric chillers. Each of Tecogen's units can cool approximately 800,000 square feet of building space. Several smaller TECOCHILL units are being used in satellite hybrid plants at the university's South Chiller Plant in Storrs and at its Stamford campus. Commercial customers can reduce the high energy costs that have resulted from real-time pricing imposed by deregulated electric utilities by having two different energy sources to choose between. The Hybrid Chiller Plant at the University of Connecticut, for example, uses sophisticated microprocessor controls to automatically switch back and forth between electricity and natural gas for cooling, choosing whichever energy source is most cost-effective at any given time. Tecogen's chillers allow commercial and industrial customers to significantly reduce their energy costs by running on natural gas, which is readily available during the summer months when demand for heating is low, but demand for air conditioning is high. The TECOCHILL systems are clean and non-polluting, and have successfully met the most stringent air-quality standards in the United States. About Tecogen Tecogen Inc. operates in the distributed generation market and is a leading manufacturer of natural gas-fueled commercial and industrial cooling and heat-recovery systems. Tecogen has an installed base of more than 1,000 units, which it supports through an established network of engineering, sales, and service support. Formerly a public subsidiary of Thermo Electron Corporation, the company is now privately held. Tecogen is based in Waltham, Massachusetts, with annual revenues of approximately $13 million.