ELECTRIC POWER SUPPLY SYSTEM

An electric power supply system supplies electric power to an external load. The system includes a hydrogen supply unit including a hydrogen generation device that performs electrolysis to generate hydrogen, a hydrogen storage unit including a first storage device and a second storage device that store hydrogen obtained by the hydrogen supply unit, a fuel cell unit including a fuel cell that generates the electric power based on hydrogen supplied from the hydrogen storage unit, an electric power storage unit including a first electric power storage device and a second electric power storage device that store the electric power obtained by the fuel cell, and a control unit. The control unit controls switching a source of supply of hydrogen to the fuel cell among the first storage device, the second storage device, and both the first storage device and the second storage device.