Fuel cell is an electrochemical device which convert the chemical energy of a fuel hydrogen (H2), or H2 rich fuels, together with oxygen (O2) from air, into electric energy and heat. The characteristic is high efficiency, low acoustic and thermal emissions. The six most important fuel cell technologies Phosphoric Acid Fuel Cell (PAFC), Molten Carbonate Fuel Cell (MCFC), Alkaline Fuel Cell (AFC), Proton Exchange Membrane Fuel Cell (PEMFC), Solid Oxide Fuel Cell (SOFC), Direct Methanol Fuel Cell (DMFC) have developed and tested over thirty years. It is successful testing and application on military, space, building, plant, transportation and portable equipment. Mass production to reduce costs, fuel cell can replace fossil energy.