Abstract: An electric device has an electric power measurement unit with an electric power detection element measuring consumed electric power and an information communication element transmitting the measured power. An electric power meter has an information communication element measuring and transmitting total electric power consumed indoors. An information processing unit stores the measured values in every predetermined sampling period. If a difference ? of two measurement values of the electric power detection element is a finite value, the information processing unit calculates and stores both a difference ? of two measurement values of the electric power meter corresponding to the two measurement values and ?/?, and calibrates the amount of electric power consumed by the electric device and that is measured by the electric power detection element using a median of values of ?/? obtained in a predetermined measurement period or a median of a predetermined number of values of ?/?.

Abstract: An energy system having a plurality of storage batteries and renewable power supplies includes an information processor. Each of the storage batteries is individually set to a maximum SOC representing a charging limit and a minimum SOC representing a discharging limit. Each of the storage batteries is chargeable and dischargeable under the control of an external device and is capable of measuring SOC values. The information processor controls charging and discharging processes of the storage batteries individually to keep the storage batteries charged until SOC values acquired from the storage batteries reach the maximum SOC when the storage batteries are charged and to keep the storage batteries discharged until SOC values acquired from the storage batteries reach the minimum SOC when the storage batteries are discharged.