Citigroup Global Markets Inc. will be the sole bookrunner for this offering and Stephens Inc. will act as co-manager. The shares of common stock will be offered under Plug Power's existing shelf registration statement filed with the Securities and Exchange Commission. The prospectus supplement and accompanying prospectus related to this public offering has been filed with the Securities and Exchange Commission. When available, copies of the prospectus supplement and accompanying prospectus may be obtained from Plug Power Inc. at 968 Albany-Shaker Road, Latham, New York 12110, from Citigroup Global Markets Inc. (Brooklyn Army Terminal, 140 58th Street, 8th Floor, Brooklyn, NY 11220), or from Stephens Inc. (111 Center Street, Little Rock, Arkansas 72201).

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any state.

About Plug Power: Plug Power Inc. is an established leader in the deployment of clean, reliable, on-site energy products. More than 550 Plug Power fuel cell systems have been delivered to customers worldwide in commercial, public sector, telecommunications, utility and uninterruptible power supply markets.