PROBLEM TO BE SOLVED: To provide a grid controller in a smart grid system, smart grid system including the controller, and control method capable of effectively smoothing power transmitted to the outside without newly introducing a high-capacity power storage facility.SOLUTION: A grid controller 2 communicably connected to each control unit 51,... of a plurality of power storage facilities 31,... acquires transmission power Pall transmitted from a smart grid system to an external power system, which is the sum total of generated power generated by power generation facilities 21,..., consumption power consumed in loads in the smart grid system, and power for charging/discharging the power storage facilities 31,...; calculates differential power P between the transmission power Pall and smoothed calculation output Pall' obtained by performing smoothing operation on the transmission power Pall by using a smoothing filter; and performs control of smoothing the transmission power Pall by assigning the differential power P of the transmission power Pall according to a charge/discharge state of each power storage unit 41,... of the plurality of power storage facilities 31,....
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