In windy areas, wind - powered generators can create a great amount of electrical energy. Today,wind energy is mainly used to generate electricity. Wind is a renewable energy source because the wind will blow as long as the sun shines.
Wind is simply air in motion. It is caused by the uneven heating of the Earth's surface by the sun. Because the Earth's surface is made of very different types of land and water, it absorbs the sun's heat at different rates. One example (from the picture on the right) of this uneven heating can be found in the daily wind cycle.