The hydrogen-fueled GenCore(R) 5-kilowatt fuel cell system, designed to provide extended run backup power, is now available with floating ground in 48Vdc, 108Vdc and 120Vdc outputs to meet the unique requirements of electric utility distribution and transmission substations. The Company is accepting orders for the floating ground systems and expects to begin shipments next month. These new configurations complement the 24Vdc positive ground and 48Vdc positive and negative ground GenCore(R) systems currently available.

"To date, Plug Power has shipped more than 80 GenCore(R) systems to customers requiring backup power solutions," said Mark Sperry, Chief Marketing Officer. "Today's announcement enables us to now expand our presence into electric utility markets that also require critical backup power solutions."

The GenCore(R) product line includes products for the telecommunication, cable broadband and the uninterruptible power supply markets. GenCore(R) is on display this week at Power-Gen International, the largest power event in the world, in Orlando, Florida (Plug Power booth #3575).

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 additional information on the Company 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. SOURCE Plug Power Inc.