The control system (100) comprises an engine (10), a MG (20), a high-voltage battery (30), a first load (40), a second load (50) and an ECU (60). When the ECU determines that a signal requesting for the driving of the second load has been detected, the ECU outputs to the engine a control signal for starting power generation by the MG. At the same time, the ECU outputs the control signal to the power supply control circuit connected to the second load such that the ECU disconnects the electric connection between the high-voltage battery and the second load. When the electric connection between the high-voltage battery and the second load is disconnected, the power supply is prohibited from the high-voltage battery to the second load during power generation by the MG.