POWER CONTROL DEVICE AND POWER CONTROL METHOD

A power control device is provided at a customer site having a distributed power supply capable of supplying power and load devices and controls a stand-alone operation in which the power supplied from the distributed power supply is converted to AC power and supplied to the load devices. The power control device comprises: a determination processing unit for determining whether or not a power supply supplied from the distributed power supply during the stand-alone operation satisfies a power demand necessary for operating the load devices; and a supply control unit for, when it is determined that the power supply does not satisfy the power demand, intermitting the stand-alone operation. After intermitting the stand-alone operation, the determination processing unit re-executes the stand-alone operation and determines whether the power supply satisfies the power demand or not. When it is consecutively determined predetermined times that the power supply does not satisfy the power demand or when a predetermined period of time has elapsed without determining that the power supply satisfies the power demand after determining that the power supply does not satisfy the power demand, the determination processing unit stops the re-execution.