Hospital Maintains Critical Air Conditioning Service throughout the Recent Power Outages with TECOCHILL® Natural Gas-Powered Chillers WALTHAM, Mass., August 25, 2003 - Thanks to American Distributed Generation’s TECOCHILL equipment, the recent widespread electricity blackouts did not "pull-the-plug" on critical air conditioning services at New York’s Jamaica Hospital Medical Center, a 387-bed community teaching hospital in Jamaica, Queens. When the power went off on August 14, the hospital was able to rely upon its two 400-ton capacity natural gas TECOCHILL units for the continued safety and comfort of its patients and staff. "When heat and humidity-levels soar, air conditioning is not a luxury at healthcare facilities like Jamaica Hospital -- it is a necessity," said John N. Hatsopoulos, chief executive officer of American Distributed Generation, Inc. "Every hospital is required by law to have emergency generators to run vital services when the power goes down. Unlike electric chillers, which require amounts of power too taxing for most backup generators, the TECOCHILL units run primarily on natural gas so they can continue to function during a power outage, without jeopardizing other essential operations." "We are gratified that our emergency planning paid off and were able to maintain cooling operations during the power shutdown," said Hans Waldvogel, director of engineering for the hospital. Installed at Jamaica Hospital in early 2001, the TECOCHILL engine-driven chillers have also yielded significant energy cost savings, another key benefit, according to Waldvogel. "As a community hospital, we are always looking for innovative ways to do more for less. TECOCHILL has reduced our utility expenses by more than $125,000 per year. With these savings, we have been able to recoup our investment in just 2 ½ years." American Distributed Generation achieves high energy efficiencies with its TECOCHILL and TECOGEN® systems by recovering exhaust heat to produce hot water as a by-product of chiller and generator operations. Currently, there are over 120 TECOCHILL units serving more than 50 medical and commercial facilities in the New York metropolitan area alone. Tecogen plans to develop a prototype system and initiate field tests by spring 2005. The company expects to introduce the system commercially by early 2006. About Tecogen 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 electricity right at the customer's facility, capturing the waste heat to produce domestic hot water. Tecogen has a nationwide installed base of more than 1,800 units, which it supports through an established network of engineering, sales, and service support. Tecogen is a subsidiary of American Distributed Generation Inc. based in Waltham, Massachusetts. For more information, go to www.tecogen.com. About American Distributed Generation, Inc. A privately held company based in Waltham, Massachusetts, American Distributed Generation provides a range of innovative products and services in support of the emerging market for on-site generation of electricity, heating, and cooling at commercial, institutional, and light-industrial facilities. In addition to TECOGEN® and TECOCHILL® equipment and field service, the company also offers customers a "virtual utility" option for the purchase of electricity and other energy services at prices below conventional utility rates. For more information, go to www.americandginc.com. About Jamaica Hospital Medical Center A 387-bed, fully accredited community teaching hospital with a large network of community-based ambulatory care centers, JHMC offers a full array of acute inpatient, rehabilitation, and mental health services and is a Level I trauma center. The hospital provides general medical, pediatric, and psychiatric emergency services, ambulatory care on and off campus, ambulatory surgery, a broad spectrum of diagnostic and treatment services, and home health services.