Winds are caused by the uneven heating of the atmosphere by the sun, the irregularities of the earth's surface, and rotation of the earth. This wind flow, or motion energy, when "harvested" by modern wind turbines, can be used to generate electricity.

Wind power involves converting wind energy into electricity by using wind turbines. A wind turbine is composed of 3 propellers-like blades called a rotor. The rotor is attached to a tall tower (about 20m high). 

Working of a wind power plant:

1. The kinetic energy of the wind makes the rotor spin.
2. A shaft is connected to the centre of this rotor. When the rotor spins, the shaft spins as well. In this way, the rotor transfers its mechanical, rotational energy to the shaft, which connects to a gearbox.
3. The gearbox provides additional speed and rotates another shaft at a very high speed. This high-speed shaft is connected to the generator on the other end.
4. Inside the generator, the shaft connects to an assembly of permanent magnets and moves them past stationary coils of wire known as the stator. As the magnets pass the stator, AC electricity is produced.
5. It is then converted into DC electricity which can be used to charge batteries which store the electrical energy or can also be fed into a grid interactive inverter for feeding power into the electricity grid.