A power control device comprising: a first interconnected operation switch respective ends of which are connected to a grid and a power generation device; a current sensor configured to detect current flowing between the grid and the power generation device; while the power generation generates power, the current sensor is configured to detect a forward power flow, the forward power flow being a current flowing from the grid; a second interconnected operation switch respective ends of which are connected to the grid and a distributed power source (11, 12) other than the power generation device; an independent operation switch respective ends of which are connected to the power generation device and the distributed power source (11, 12); and a controller configured to control operation of the interconnected operation switches (22,23) and the independent operation switch; an output unit, characterized in that: during interconnected operation in which power from the grid, the distributed power source (11, 12), and the power generation device is supplied to a load, the controller is configured to switch each interconnected operation switch (22, 23) on and the independent operation switch off; and during independent operation in which power from the distributed power source (11, 12) and the power generation device is supplied to the load, the controller is configured to switch each interconnected operation switch (22, 23) off and the independent operation switch on, and the output unit is configured to output power from the distributed power source (11, 12) while the power generation device and the distributed power source (11, 12) are disconnected from the grid, thereby supplying a dummy current to the current sensor, the dummy current flowing in the same direction as the forward power flow. a first interconnected operation switch respective ends of which are connected to a grid and a power generation device; a current sensor configured to detect current flowing between the grid and the power generation device; while the power generation generates power, the current sensor is configured to detect a forward power flow, the forward power flow being a current flowing from the grid; a second interconnected operation switch respective ends of which are connected to the grid and a distributed power source (11, 12) other than the power generation device; an independent operation switch respective ends of which are connected to the power generation device and the distributed power source (11, 12); and a controller configured to control operation of the interconnected operation switches (22,23) and the independent operation switch; an output unit, characterized in that: during interconnected operation in which power from the grid, the distributed power source (11, 12), and the power generation device is supplied to a load, the controller is configured to switch each interconnected operation switch (22, 23) on and the independent operation switch off; and during independent operation in which power from the distributed power source (11, 12) and the power generation device is supplied to the load, the controller is configured to switch each interconnected operation switch (22, 23) off and the independent operation switch on, and the output unit is configured to output power from the distributed power source (11, 12) while the power generation device and the distributed power source (11, 12) are disconnected from the grid, thereby supplying a dummy current to the current sensor, the dummy current flowing in the same direction as the forward power flow. during interconnected operation in which power from the grid, the distributed power source (11, 12), and the power generation device is supplied to a load, the controller is configured to switch each interconnected operation switch (22, 23) on and the independent operation switch off; and during independent operation in which power from the distributed power source (11, 12) and the power generation device is supplied to the load, the controller is configured to switch each interconnected operation switch (22, 23) off and the independent operation switch on, and the output unit is configured to output power from the distributed power source (11, 12) while the power generation device and the distributed power source (11, 12) are disconnected from the grid, thereby supplying a dummy current to the current sensor, the dummy current flowing in the same direction as the forward power flow.