The area around the equator is most strongly warmed up by the sun. As warm air is easier than cold, the first mentioned rises at a value of approx. 10km. flows off there to the north and the south. If the earth do not rotate, the air goes to the North or South Pole drops there and flows back to the equator. Air is up-mixed from the rotating motion of the globe and it results the "product" wind.
Wind energy generally
Mode of operation