A control apparatus controls power generation of an electric generator and communicates with an external control apparatus. The control apparatus includes a receiver, a controller, an initialization state detector, and a transmitter. The receiver receives a command signal transmitted by the external control apparatus. The controller controls power generation of the electric generator according to the command signal received by the receiver. The initialization state detector detects an initialization state of the control apparatus. The transmitter transmits, when the initialization state of the control apparatus is detected by the initialization state detector, an informing signal to the external control apparatus, thereby informing the external control apparatus that the control apparatus is in the initialization state.