Abstract: A mobile vehicle power supply system and an electricity exchanging system enhance the economic viability of different modes of transportation that incorporate generators, such as electric motors and fuel cells, to generate electricity. The power supply system provides for the off-board use of the electric power generated by the generator of a mobile vehicle, such as an electric car. Off-board use, or use remote from the vehicle, of the electrical power includes the delivery of power to a remote site. Off-board stations are provided for delivery of fuel to the vehicle and/or for receiving the electrical power generated by the fuel cell. The off-board station and the vehicle are appropriately equipped for quick and easy interconnection such that electrical power can be exchanged between the vehicle and off-board station and the electricity exchanging system.