Compressed hydrogen gas, in an approved composite cylinder, capable of storing 8 normal cubic meters of hydrogen. Maximum speed is equal to cruising speed of 25 mph. The vehicle is capable of considerably higher speed. From a filling station or a lager tank of compressed hydrogen. They provided electricity in all manned spacecraft since the Gemini project, including Apollo and the Space Shuttle.
Fuel cells convert chemical energy of fuel into electricity.
In comparison with conventional generators they are highly efficient, non-polluting, quiet and odourless. Now Astris is bringing this space age technology down to Earth. Built mostly from carbon and plastic, they use only small amount of metal parts. They achieve good performance without use of platinum and other exotic materials. Astris has built fuel cells and fuel cell power generators spanning the range of power from fraction of a kilowatt to several kilowatts.