CONTROL SYSTEM AND CONTROL METHOD

A control system controls an amount of power demand indicating an amount of electric power supplied from an external power supply (PG) to a supply target (1). The supply target includes a first resource (100, 220) and a second resource (210, 220, 230, 241) configured to allow adjustment of the amount of power demand. The control system includes a first controller (111, 12A) that controls the first resource and a second controller (12, 12B) that controls the second resource. The first controller controls the first resource independently of the second controller. Upon satisfaction of a first start condition, one of the first resource and the second resource starts a first adjustment operation to suppress increase in amount of power demand (F1, F2A). Upon further satisfaction of a second start condition in addition to the first start condition, the other of the first resource and the second resource starts a second adjustment operation to suppress increase in amount of power demand (F2, F1A, F2B, F2C, F2D).