A wind turbine generator includes a synchronous generator that generates electric power via rotation of a rotor provided with blades that receive wind and that supplies the generated electric power to a utility grid, and a sea water resistor in which sea water serves as a resistive element. When the output power of the synchronous generator drops suddenly because of a momentary power interruption caused by a fault occurring on the utility grid, thus producing surplus energy, the sea water resistor consumes, in the form of electric power, the surplus energy that cannot be supplied to the utility grid from among the electric power generated at the synchronous generator. Because the sea water resistor uses sea water as the resistive element, the problem of heat generation hardly ever arises, and because the sea water can be easily exchanged, it is not affected by lifetime or on-time limitations.