A system stabilization system for suppressing power fluctuations in a power system, the system stabilization system comprising: a power storage apparatus configured to suppress a power fluctuation in the power system by either charging or discharging in response to a control; a capacitor apparatus configured to suppress a power fluctuation in the power system by making the charge/discharge response to control faster than the power storage apparatus, and charging or discharging in response to the control; and characterized in that a control apparatus configured to control the power storage apparatus and the capacitor apparatus so as to reduce occurrences of charging or discharging in the power storage apparatus by adjusting a charge/discharge starting time of the power storage apparatus and of the capacitor apparatus so as to suppress either charging or discharging occurring in the power storage apparatus, wherein the control apparatus, when a power fluctuation is detected in the power system, is configured to start either the charging or the discharging of the capacitor apparatus to suppress the power fluctuation, and, when the state-of-charge of the capacitor apparatus has reached a prescribed charge threshold, is configured to start either the charging or the discharging of the power storage apparatus directly from or to the power system, respectively, to suppress the power fluctuation. the system stabilization system comprising: a power storage apparatus configured to suppress a power fluctuation in the power system by either charging or discharging in response to a control; a capacitor apparatus configured to suppress a power fluctuation in the power system by making the charge/discharge response to control faster than the power storage apparatus, and charging or discharging in response to the control; and characterized in that a control apparatus configured to control the power storage apparatus and the capacitor apparatus so as to reduce occurrences of charging or discharging in the power storage apparatus by adjusting a charge/discharge starting time of the power storage apparatus and of the capacitor apparatus so as to suppress either charging or discharging occurring in the power storage apparatus, wherein the control apparatus, when a power fluctuation is detected in the power system, is configured to start either the charging or the discharging of the capacitor apparatus to suppress the power fluctuation, and, when the state-of-charge of the capacitor apparatus has reached a prescribed charge threshold, is configured to start either the charging or the discharging of the power storage apparatus directly from or to the power system, respectively, to suppress the power fluctuation. a power storage apparatus configured to suppress a power fluctuation in the power system by either charging or discharging in response to a control; a capacitor apparatus configured to suppress a power fluctuation in the power system by making the charge/discharge response to control faster than the power storage apparatus, and charging or discharging in response to the control; and characterized in that a control apparatus configured to control the power storage apparatus and the capacitor apparatus so as to reduce occurrences of charging or discharging in the power storage apparatus by adjusting a charge/discharge starting time of the power storage apparatus and of the capacitor apparatus so as to suppress either charging or discharging occurring in the power storage apparatus, wherein the control apparatus, when a power fluctuation is detected in the power system, is configured to start either the charging or the discharging of the capacitor apparatus to suppress the power fluctuation, and, when the state-of-charge of the capacitor apparatus has reached a prescribed charge threshold, is configured to start either the charging or the discharging of the power storage apparatus directly from or to the power system, respectively, to suppress the power fluctuation.