an improved energy density homopolar generator is disclosed . the generator includes a stator assembly for generating a magnetic field within an interior region and a rotor responsive to the input drive and the magnetic field for generating the output generator voltage . the rotor includes a current generator means that responds to the rotation of the rotor in the magnetic field to collect the current and voltage to output terminals . an energy storage means is also provided with the rotating rotor for storing kinetic energy where the energy storage capacity of a storage means is determined independently of collection of the current and voltage by the current generator means .