An electrical power control system includes a first fuel cell system and a second fuel cell system, and a waste electricity unit connected in series with a switch unit. The waste electricity unit and the switch unit are connected in parallel with each of the fuel cell systems. At a time when at least one power supply system is started, a control unit selectively executes a charging control and a waste electricity control, based on at least one of temperature information and electrical storage information. The charging control suppresses a rise in voltage by supplying the electrical power of the power supply system to the power storage device. The waste electricity control suppresses a rise in voltage by supplying the electrical power of the power supply system to the waste electricity unit.