Wind power generation is a method of generating electricity whereby the force of the wind spins a wind turbine, which produces electricity in a generator connected to the wind turbine. Like solar, wind is not depleted no matter how much is used, so it has been widely adopted around the world and efforts are underway in Japan to expand its use. Renewable Japan will continue to actively develop wind power to ensure a stable supply of electricity.
When wind is caught by the blades of the windmill, kinetic energy is generated. This kinetic energy is transmitted to the gearbox in the nacelle, amplified until the rotational speed required for generating electricity is reached, and then it is converted to electricity. (Some windmills have the blades and generator connected directly with shafts (rotors) without using a gearbox.) In addition, a brake system is installed inside the nacelle, which is used to stop the windmill as needed when inspection is necessary, when a typhoon comes, or in other cases.