Proton Energy Systems Appoints Kyle Cook as Southeast Regional Sales Manager


Wallingford, Conn. - June 28, 2006 - Proton Energy Systems, Inc., a subsidiary of Distributed Energy Systems Corp. (NASDAQ: DESC) and manufacturer of HOGEN® on-site hydrogen generation systems, has appointed Kyle Cook as Southeast regional sales manager.

Cook brings to Proton Energy Systems over 17 years of onsite gas experience with international industry leaders in small to medium sized onsite gas systems.

Based in Houston, he is responsible for sales of Proton's HOGEN® hydrogen generators from Texas and Oklahoma east to Florida and as far north as North Carolina. He will focus on four major industrial applications: power plant generator cooling, materials processing (heat treating, annealing, brazing, sintering and powder metallurgy), semiconductor manufacturing (including Metal organic Chemical Vapor Deposition (MOCVD) applications) and laboratory hydrogen.

"Kyle's extensive equipment sales training experience, and his knowledge of the advantages of onsite gas usage, will help us provide the appropriate HOGEN generation systems to hydrogen users across a range of industries and applications," said David Wolff, vice president, sales and marketing. "He is a terrific addition to Proton Energy's experienced team."

Kyle Cook may be contacted at (281) 204-1275 (phone and fax); (832) 221-6962 (cell phone) or kcook@protonenergy.com

About Proton Energy Systems, Inc.

Proton Energy Systems, Inc., a subsidiary of Distributed Energy Systems Corp., is a world leader in development and manufacture of Proton Exchange Membrane (PEM) on-site hydrogen generators. Proton's HOGEN® hydrogen systems are used worldwide to supply hydrogen for industrial processes such as power plant generator cooling, materials processing, semiconductor manufacturing, fuel cell fueling, chemical reactions and laboratory analysis. For more information, please visit www.protonenergy.com.

About Distributed Energy Systems Corp.

Distributed Energy Systems Corp. (NASDAQ: DESC) creates and delivers products and solutions to the emerging decentralized energy marketplace, giving users greater control over their energy cost, quality and reliability. As the parent company of Proton Energy Systems (www.protonenergy.com) and Northern Power Systems (www.northernpower.com), Distributed Energy Systems delivers a combination of practical, ready-today energy solutions and the solid business platforms for capitalizing on the changing energy landscape. For more information visit distributed-energy.com.

Proton Energy Systems (NASDAQ: DESC - News)
10 Technology Drive
Wallingford, CT 06492

Contact:
David Wolff, vice president, sales and marketing
203.678.2349
dave.wolff@protonenergy.com

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