EXHIBIT 99.1

Plug Power Announces Second Quarter 2013 Financial Results

LATHAM, N.Y., Aug. 8, 2013 (GLOBE NEWSWIRE) -- Plug Power Inc. (Nasdaq:PLUG), a leader in providing clean, reliable energy solutions, today reported its financial results for the second quarter 2013.

In the quarter, Plug Power experienced a renewed customer interest in its business due, in part, to the May 8 announcement of a $6.5 million investment by Air Liquide. Of the $7.5 million in new orders received during the second quarter of 2013, $6.1 million occurred between the date the investment was announced, and the end of the second quarter.

An example of this is Mercedes-Benz's announcement that it would add 123 GenDrive fuel cell units to its fleet in Huntsville, AL, to support a new Mercedes logistics center located adjacent to its manufacturing facilities. This order rate puts the Company on the pace it needs to meet its stated goal of being profitable on an earnings before interest, taxes, depreciation, amortization and stock-based compensation (EBITDAS) basis by mid-year 2014.

Plug Power business highlights in the second quarter of 2013 include customer shipments to Carters, Sysco Riverside, BMW, and P&G. These sales include significant expansions to existing sites by BMW, and the conversion of forklift trucks at P&G's Mehoopany, PA, site from lead-acid battery to GenDrive fuel cells.

The Sysco Riverside, CA, facility is one of the first Plug Power customers to use an onsite reformer to convert natural gas to hydrogen. The use of onsite reformers opens up a new market segment of smaller distribution facilities where fuel cells can now be used cost effectively. The Company estimates that the use of this technology expands its addressable market in the U.S. by $1 billion USD.

Plug Power is also on-target for the quarter for the material cost for new product shipments, and the Company is projecting that service costs will be significantly reduced by year-end 2013. Continuous improvement in operating costs is another benchmark for achieving breakeven EBITDAS in 2014.

"What is most encouraging about this quarter's sales is realizing the business coming from long-time customers who are both growing their fleets in existing installations and expanding to new facilities. This, plus our recent investment from Air Liquide, are proof points to prospects that GenDrive fuel cells are a superior alternative to lead-acid batteries," said Andy Marsh, CEO of Plug Power. "From an execution perspective, I'm pleased with the progress we're making toward meeting the targets we've set for revenue and for managing our operational costs."

Financial Results

The financial information below consists of preliminary estimates prepared by Plug Power's management and as such may be subject to final adjustment. Therefore, actual results may differ from these estimates. The final financial information will be included in our filing of the Form 10-Q on or before August 14, 2013.

Net loss for the second quarter of 2013 was $9.3 million, or $0.14 per share on a basic and diluted basis. This compares with a net loss of $6.5 million, or $0.17 per share, for the second quarter of 2012.

Total revenue for the second quarter of 2013 was $7.5 million, comprised of $7.1 million for product and service revenue and $0.4 million for research and development (R&D) contract revenue. This compares to total revenue of $7.7 million in the second quarter of 2012, which was comprised of $7.2 million for product and service revenue and $0.5 million for R&D contract revenue.

The Company shipped 246 units during the second quarter of 2013 compared to 388 units in the second quarter of 2012.

Total cost of revenue for the second quarter of 2013 was $9.5 million, comprised of $9.0 million for cost of product and service revenue and $0.5 million for cost of R&D contract revenue. This compares to total cost of revenue of $9.5 million in the second quarter of 2012, which was comprised of $8.7 million for cost of product and service revenue and $0.8 million for cost of R&D contract revenue.

R&D expenses for the second quarter of 2013 were $0.8 million compared with $1.6 million for the second quarter of 2012. Selling, general and administrative (SG&A) expenses were $3.2 million for the second quarter of 2013 compared with $3.6 million for the second quarter of 2012. Additionally, $0.6 million was expensed for amortization of intangible assets during the second quarter of 2013 and 2012.

Cash and Liquidity

Net cash used in operating activities for the second quarter of 2013 was $5.0 million. Plug Power had cash and cash equivalents of $7.4 million and net working capital of $11.1 million at June 30, 2013. This compares to $9.4 million and $6.9 million, respectively, at December 31, 2012.

The accompanying consolidated financial information and reconciliation tables provide additional information on the Company's year-to-date performance as it relates to milestones previously announced.

Conference Call

Plug Power has scheduled a conference call today at 10:00 am ET to review the Company's results for the second quarter 2013 results. Interested parties are invited to listen to the conference call by calling 877.407.8291.

The webcast can be accessed by going directly to the Plug Power Web site (www.plugpower.com) and selecting the conference call link on the home page. A playback of the call will be available online for a period following the call.

About Plug Power Inc.

The architects of modern fuel cell technology, Plug Power is revolutionizing 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 Walmart, Sysco, P&G and Mercedes. With more than 4,000 GenDrive units deployed to material handling customers, accumulating over 12 million hours of runtime, Plug Power manufactures tomorrow's incumbent power solutions today. Additional information about Plug Power is available at www.plugpower.com.

Plug Power Inc. Safe Harbor Statement

This communication contains statements that are not historical facts and are considered forward-looking within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. These forward-looking statements contain projections of our future results of operations or of our financial position or state other forward-looking information. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to accurately predict or control and that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. Investors are cautioned not to unduly rely on forward-looking statements because they involve risks and uncertainties, and actual results may differ materially from those discussed as a result of various factors, including, but not limited to: the risk that we continue to incur losses and might never achieve or maintain profitability, the risk that we expect we will need to raise additional capital to fund our operations and such capital may not be available to us; the risk that we do not have enough cash to fund our operations to profitability and if we are unable to secure additional capital, we may need to reduce and/or cease our operations; the risk that a "going concern" opinion from our auditors, KPMG LLP, could impair our ability to finance its operations through the sale of equity, incurring debt, or other financing alternatives; the recent restructuring plan we adopted may adversely impact management's ability to meet financial reporting requirements; our lack of extensive experience in manufacturing and marketing products may impact our ability to manufacture and market products on a profitable and large-scale commercial basis; the risk that unit orders will not ship, be installed and/or converted to revenue; the risk that pending orders may not convert to purchase orders; the risk that our continued failure to comply with NASDAQ's listing standards may result in our common stock being delisted from the NASDAQ stock market, which may severely limit our ability to raise additional capital; the cost and timing of developing, marketing and selling our products and our ability to raise the necessary capital to fund such costs; the ability to achieve the forecasted gross margin on the sale of our products; the actual net cash used for operating expenses may exceed the projected net cash for operating expenses; the cost and availability of fuel and fueling infrastructures for our products; market acceptance of our GenDrive systems; our ability to establish and maintain relationships with third parties with respect to product development, manufacturing, distribution and servicing and the supply of key product components; the cost and availability of components and parts for our products; our ability to develop commercially viable products; our ability to reduce product and manufacturing costs; our ability to successfully expand our product lines; our ability to improve system reliability for our GenDrive systems; competitive factors, such as price competition and competition from other traditional and alternative energy companies; our ability to protect our intellectual property; the cost of complying with current and future federal, state and international governmental regulations; and other risks and uncertainties discussed under "Item IA—Risk Factors" in Plug Power's annual report on Form 10-K for the fiscal year ended December 31, 2012, filed with the Securities and Exchange Commission ("SEC") on April 1, 2013 and as amended on April 30, 2013 and the reports Plug Power filed from time to time with the SEC. These forward-looking statements speak only as of the date on which the statements were made and are not guarantees of future performance. Except as may be required by applicable law, we do not undertake or intend to update any forward-looking statements after the date of this communication.

CONTACT: Media & Investor Relations Contact:
         Gerard L. Conway, Jr.
         Plug Power Inc.
         Phone: (518) 782-7700
         investors@plugpower.com