Plug Power Inc. (Plug Power), is a provider of alternative energy technology focused on the design, development, commercialization and manufacture of fuel cell systems for the industrial off-road (forklift or material handling) market. The Company is focused on proton exchange membrane( PEM), fuel cell and fuel processing technologies and fuel cell/battery hybrid technologies, from which multiple products are available. The Company is focused on A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity and heat without combustion. Hydrogen is derived from hydrocarbon fuels such as liquid petroleum gas, or LPG, natural gas, propane, methanol, ethanol, gasoline or biofuels. Hydrogen can also be obtained from the electrolysis of water. Hydrogen can be purchased directly from industrial gas providers or can be produced on-site at consumer locations. In May 2013, Air Liquide SA acquired a 14% stake in Plug Power Inc.