Patent ID: 8560135

Claim:
An energy management system comprising an energy storage controller for performing control to store power generated by photovoltaic power generation facilities in energy storage facilities, comprising: a battery and an electric water heater as energy storage facilities; a control unit configured to control thermal storage of the electric water heater and charging of the battery as the energy storage controller; an equipment data management unit configured to manage data on charging/discharging loss of the battery and data on heat radiation loss of the electric water heater; a system operation calculation unit for predicting a voltage distribution at a predetermined time of a distribution system or a demand-and-supply balance amount of the entire system by using state monitoring data of a power system; and a consumer cooperation calculation unit for acquiring prediction information on the voltage distribution at a predetermined time of the distribution system or on the demand-and-supply balance amount from the system operation calculation unit and calculating a demand amount increasing a target value necessary for avoiding a power generation amount suppression of photovoltaic power generation facilities on a consumer end; wherein the control unit acquires the demand amount increasing the target value from the consumer cooperation calculation unit, and controls the energy storage facilities so as to satisfy the demand amount increasing the target value on the consumer end; and wherein the equipment data management unit causes the control unit to perform control to compare the charging/discharging loss and the heat radiation loss, and to give priority based on the comparison to the energy storage facility that more reduces loss and store energy therein.