NOVELTY - A reformed gas storage container (3) stores reformed gas comprising gaseous hydrocarbon fuel and gaseous fuel containing hydrogen, obtained from a reformer (1) which reforms hydrocarbon fuel supplied from a tank (4). A reformed gas supply port (9) supplies both gaseous hydrocarbon and gaseous fuel containing hydrogen.    USE - Multi-fuel supply system for producing different gaseous fuels, for use in power generation.    ADVANTAGE - The multi-fuel supply system has a simple structure and is capable of supplying both gaseous hydrocarbon fuel and hydrogen fuel, by providing the hydrogen separation device to separate hydrogen gas from the reformed gas.    DETAILED DESCRIPTION - The tank stores hydrocarbon fuel, such as gasoline and methanol. An electrochemical separation device separates hydrogen gas from the reformed gas. A hydrogen gas storage container stores the separated hydrogen gas. The separation device comprises an electrode on both sides of a solid polymer film. By impressing an electric current to one of the electrodes, such that the electric potential of one of the electrodes is made higher than the electric potential of the opposing electrode, electrochemical separation of hydrogen from the reformed gas is enabled. Electricity is generated in an electricity generation unit due to electrochemical reaction of hydrogen and oxygen occurring between the electrodes. Generated electricity is stored in a fuel cell and is supplied to the hydrogen separation device for enabling separation of hydrogen from the reformed gas. A water storage tank stores the water ejected from the reformed gas storage container. Electrical power stored in the fuel cell is supplied to an electrical installation within a station at the time of emergency. The exhaust gas obtained from the reformer of the electricity generation unit is fed to a combustion chamber (1a) of the fuel reformer. Waste heat obtained from the exhaust gas is used by a waste heat recovery unit.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic view of the multi-fuel supply system.    Reformer (1)    Reformed gas storage container (3)    Tank (4)    Reformed gas supply port (9)