An energy saving system (1300, 1600, 1900) comprising: - an electrical power consumption quantity information acquisition unit (1301, 1601, 1901) for acquiring information on the quantity of electrical power consumed by a plurality of electric devices; - a target demand value storage unit (1302, 1602, 1902) for storing a target demand value for electrical power consumption of the plurality of electric devices; - a supply surplus indicator acquisition unit (1303, 1603, 1903) for acquiring in time intervals indicators of surplus electric power supplied by an electric power company having control over electrical power within a certain region; - a control unit (1304, 1604, 1904) for controlling the electrical power consumption of the plurality of electric devices based on the acquired supply surplus indicators, the acquired electrical power consumption quantity information, and the stored target demand value, - the target demand value storage unit (1302, 1602, 1902) comprises means (1305, 1605, 1905) for storing a target demand value on a group basis (1305A, 1305B, 1305C), which has been set based on categorization of the plurality of electric devices into a plurality of groups, - the control unit (1304, 1604, 1904) being further configured to implement the control of the electrical power to be consumed on a group basis characterized in that, - the control unit (1304, 1604, 1904) comprises a target-achievement-rate-dependent control means for restricting the electrical power consumed by the plurality of groups based on an order of priority such that the closer the expected electrical power consumption quantity of a group is to 100% of the target demand value, the greater the restriction of the electrical power consumed by such group. - an electrical power consumption quantity information acquisition unit (1301, 1601, 1901) for acquiring information on the quantity of electrical power consumed by a plurality of electric devices; - a target demand value storage unit (1302, 1602, 1902) for storing a target demand value for electrical power consumption of the plurality of electric devices; - a supply surplus indicator acquisition unit (1303, 1603, 1903) for acquiring in time intervals indicators of surplus electric power supplied by an electric power company having control over electrical power within a certain region; - a control unit (1304, 1604, 1904) for controlling the electrical power consumption of the plurality of electric devices based on the acquired supply surplus indicators, the acquired electrical power consumption quantity information, and the stored target demand value, - the target demand value storage unit (1302, 1602, 1902) comprises means (1305, 1605, 1905) for storing a target demand value on a group basis (1305A, 1305B, 1305C), which has been set based on categorization of the plurality of electric devices into a plurality of groups, - the control unit (1304, 1604, 1904) being further configured to implement the control of the electrical power to be consumed on a group basis - the control unit (1304, 1604, 1904) comprises a target-achievement-rate-dependent control means for restricting the electrical power consumed by the plurality of groups based on an order of priority such that the closer the expected electrical power consumption quantity of a group is to 100% of the target demand value, the greater the restriction of the electrical power consumed by such group.