An object is to achieve discharging of electric power of a battery mounted in an electric vehicle to a power wiring so as to match with an amount of electric power consumed in a facility of a consumer, even when the electric vehicle is away from the facility of the consumer. A meter device (10) measures an amount of electric power received by a facility (1) of a consumer from a power grid (51). A discharge device (20) supplies, to a power wiring (50), electric power of a battery (41) for travelling, which is mounted in an electric vehicle (40). A control device (30) controls the discharge device (20) so as to adjust an amount of electric power to be supplied to the power wiring (50) from the battery (41). A communication portion (31) of the control device (30) acquires, through communication with the meter device (10), information regarding an amount of electric power measured by the meter device (10). An adjustment portion (32) of the control device (30) adjusts the amount of electric power to be supplied from the battery (41) to the power wiring (50) so as to be equal to an amount of electric power corresponding to at least part of the amount of electric power measured by the meter device (10).
