Plug Power Announces Over-Allotment in Connection With Public Offering

Plug Power Inc. (Nasdaq:PLUG - News) today announced that it has completed the sale of 231,000 additional shares of common stock, pursuant to the underwriter's exercise of its over-allotment option in connection with Plug Power's recently announced public offering of common stock and warrants, resulting in additional net proceeds to Plug Power of $517,624 after underwriting discounts and commissions and other offering expenses. Plug Power intends to use the net proceeds of the offering for general corporate purposes, which may include working capital, capital expenditures, research and development expenditures, commercial expenditures, acquisitions of new technologies or businesses that are complementary to its current technologies or business focus, and investments.

During Plug Power's recent public offering, the Company raised approximately $20.9 million in net proceeds, after underwriting discounts and commissions payable by Plug Power. Currently, the Company has 22,639,814 shares outstanding.

Roth Capital Partners was the sole manager for this offering.

The securities described above are being sold by Plug Power pursuant to a shelf registration statement on Form S-3 including a base prospectus, previously filed and declared effective by the Securities and Exchange Commission (SEC). The securities may be sold only by means of a prospectus. A final prospectus supplement related to the offering was filed with the SEC and is available on the SEC's website located at www.sec.gov. Electronic copies of the final prospectus supplement also may be obtained from Roth Capital Partners, LLC Equity Capital Markets, 24 Corporate Plaza, Newport Beach, CA 92660, at 800-678-9147 and Rothecm@roth.com.

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

About Plug Power Inc.

The architects of modern fuel cell technology, Plug Power revolutionized the industry with cost-effective power solutions that increase productivity, lower operating costs and reduce carbon footprints. Long-standing relationships with industry leaders forged the path for Plug Power's key accounts, including Wegmans, Whole Foods, and FedEx Freight. With more than 1,200 GenDrive units shipped to material handling customers, accumulating over 2.5 million hours of runtime, Plug Power manufactures tomorrow's incumbent power solutions today. Additional information about Plug Power is available at www.plugpower.com.