LATHAM, N.Y.-- Plug Power Inc. (Nasdaq: PLUG ), a leader in the development of proton exchange membrane fuel cell systems, announced today that the Company's GenSys(TM)5C fuel cell system has been certified by the California Air Resources Board as meeting the 2007 distributed generation emission standards requirement.

In 2001, the Air Resources Board adopted regulations pursuant to the California Health and Safety Code to establish a statewide Distributed Generation Certification Program to certify electrical generation technologies that are exempt from local air pollution control district permitting.

"The California Air Resources Board is the leading air quality management agency in the country," said Mark Sperry, Plug Power Chief Marketing Officer. "This certification validates the GenSys(TM)5C fuel cell system at the most stringent of the Board's certification levels, attesting to the system's low emission characteristics. We are proud that the Plug Power GenSys(TM)5C fuel cell system can contribute both to California's need for high quality, highly- efficient power production, and to improving the state's air quality."

About GenSys(TM)5C

The GenSys(TM)5C, is capable of generating 5kW of electricity and 9kW of heat. GenSys 5C was the first industry fuel cell system to be certified under California Energy Commission's Rule 21 grid interconnection standard which streamlines otherwise complicated interconnection, operating and metering regulations and processes applicable to distributed energy generators. The GenSys 5C was evaluated and certified by CSA International (CSA) and is certified as compliant with the American National Standards Institute (ANSI) standard for fuel cell power plants. The power conversion system was evaluated by the Underwriters Laboratories Inc. (UL) and is listed as compliant with the standard for Inverters, Converters and Controllers for use in independent power systems. GenSys 5C conforms to the Federal Communications Commission (FCC) standards for Electromagnetic Compliance (EMC).

Ten GenSys(TM)5C fuel cell systems are currently operational in San Diego and Los Angeles. Five additional systems are currently being installed in Southern California.

About Plug Power

Plug Power Inc. designs and develops on-site energy systems based on proton exchange membrane fuel cells. Plug Power's strategic partners include GE Fuel Cell Systems, DTE Energy Technologies, Vaillant GmbH, Honda R&D Co., Ltd., Engelhard Corporation and Pemeas GmbH (formerly Celanese Ventures.) The Company's headquarters are located in Latham, N.Y., with offices in Washington, D.C., and The Netherlands. For more information on Plug Power go to http://www.plugpower.com.

This press release may contain statements, which are not historical facts and are considered forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements contain projections of Plug Power's future results of operations, Plug Power's product development expectations or of Plug Power's financial position or state other forward-looking information. In some cases you can identify these statements by forward-looking words such as "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "should," "will" and "would" or similar words. You should not rely on forward-looking statements because Plug Power's actual results may differ materially from those indicated by these forward- looking statements as a result of a number of important factors. These factors include, but are not limited to, Plug Power's ability to develop commercially viable on-site energy products; the cost and timing of developing Plug Power's on-site energy products; market acceptance of Plug Power's on-site energy products; Plug Power's reliance on its relationship with certain affiliates of General Electric (GEFCS); Plug Power's ability to perform on its multi- generation product plan in a manner satisfactory to GEFCS; Plug Power's ability to manufacture on-site energy products on a large-scale commercial basis; competitive factors, such as price competition and competition from other traditional and alternative energy companies; the cost and availability of components and parts for Plug Power's on-site energy products; the ability to raise and provide the necessary capital to develop, manufacture and market Plug Power's on-site energy products; Plug Power's ability to establish relationships with third parties with respect to product development, manufacturing, distribution and servicing and the supply of key product components; Plug Power's ability to protect its intellectual property; Plug Power's ability to lower the cost of its on-site energy products and demonstrate their reliability; the cost of complying with current and future governmental regulations; the impact of deregulation and restructuring of the electric utility industry on demand for Plug Power's on-site energy products; fluctuations in the trading price and volume of Plug Power's common stock and other risks and uncertainties discussed under the heading "Factors Affecting Future Results" in Plug Power's annual report on Form 10-K for the fiscal year ended December 31, 2003, dated March 11, 2004 and filed with the Securities Exchange Commission on March 11, 2004, and the reports Plug Power files from time to time with the Securities and Exchange Commission. Plug Power does not intend to and undertakes no duty to update the information contained in this press release.