A power control device for efficiently securing reserve power as a precaution against power failure, the power control device comprising: a first communication unit configured to receive power information through a power information network; a second communication unit configured to receive reserve power information including remaining power information from a power storage unit for storing reserve power, the reserve power information including information about the amount of power that can be stored in the power storage unit per unit time; and a control unit, wherein the power information received by the first communication unit through the power information network includes power failure information and power demand information of a power consumer, the power failure information including power failure start time information and power failure duration information, the power demand information including the amount of power required by the power consumer per unit time, wherein the control unit is configured to generate power amount information based on the power failure duration information and the information about the amount of power required by the power consumer per unit time, to generate charge information based on the power amount information and the remaining power information, to generate charging duration information of the power storage unit based on the charge information and the information about the amount of power that can be stored in the power storage unit per unit time, to generate charging start time information based on the power failure start time information and the charging duration information, and to control storage of the power in the power storage unit based on charging control information including the power amount information, the charge information, the charging duration information and the charging start time information. a first communication unit configured to receive power information through a power information network; a second communication unit configured to receive reserve power information including remaining power information from a power storage unit for storing reserve power, the reserve power information including information about the amount of power that can be stored in the power storage unit per unit time; and a control unit, wherein the power information received by the first communication unit through the power information network includes power failure information and power demand information of a power consumer, the power failure information including power failure start time information and power failure duration information, the power demand information including the amount of power required by the power consumer per unit time, wherein the control unit is configured to generate power amount information based on the power failure duration information and the information about the amount of power required by the power consumer per unit time, to generate charge information based on the power amount information and the remaining power information, to generate charging duration information of the power storage unit based on the charge information and the information about the amount of power that can be stored in the power storage unit per unit time, to generate charging start time information based on the power failure start time information and the charging duration information, and to control storage of the power in the power storage unit based on charging control information including the power amount information, the charge information, the charging duration information and the charging start time information.