Toyota FCV+: The Toyota FCV+ is a fuel-cell concept that uses compressed hydrogen as an energy source.Not only is hydrogen a possible eco-friendly energy source for the future, the FCV+ also has another trick up its sleeve - it can be used to provide power to the electric grid when the vehicle is parked.Not only that, but the fuel-cell device can be reused as a future energy source independent of the vehicle, meaning that after the car's life has expired the fuel-cell could be used to power other devices.