Control device and control method

A control device comprising a control unit that acquires a total electric power supply amount to be supplied from a system of a first area to the first area, the total electric power supply amount being measured by an electric power sensor, compares the acquired total electric power supply amount and a total electric power consumption expected amount calculated based on a charging plan of an electricity storage body present in the first area, the total electric power consumption expected amount being an electric power consumption expected amount of the whole of the first area including an electric power supply expected amount to the electricity storage body, calculates a first adjustment amount that is a difference when the total electric power supply amount exceeds the total electric power consumption expected amount, determines a second area that is an electric power transmission destination of an electric power amount corresponding to all or part of the calculated first adjustment amount, causes the system of the first area to obtain the electric power amount corresponding to all or part of the first adjustment amount preferentially from an electric power generation facility that utilizes electric power generation using natural energy, and causes the system of the first area to transmit the obtained electric power amount to a system of the second area.