It's a wind turbine.
Wind power generation converts wind kinetic energy into mechanical kinetic energy, and then converts mechanical energy into electrical kinetic energy. This is wind energy production.
The principle of wind power generation is to use wind energy to drive the rotation of the blades of a wind turbine, and then use a speed multiplier to increase the rotation speed to to encourage the generator to produce electricity. According to current wind turbine technology, electricity production can begin at a breeze speed of around three meters per second (the degree of breeze). Wind energy is becoming a craze worldwide because it does not require the use of fuel and does not produce radiation or air pollution.
The devices needed to produce wind energy are called wind turbines. This type of wind turbine can be grbasically divided into three parts: the wind turbine, the generator and the tower.