Winds on earth are caused primarily by unequal heating of land and water by the sun. The differences in temperature induce circulation of air from one zone to another. This air in motion is called wind. Wind has been recognized as a force of nature, ever since the planet came into existence. Human civilization has been harnessing the force of wind from time immemorial. However, the harnessing of wind energy for power generation commercially started only in the early 1970s and has continued to grow since then. Wind energy is now recognized as one of the low investment high-yield sources of power generation. Fortunately, India has abundantly been blessed by Mother Nature in this respect.
The prominent features of wind climatology in India are the monsoon circulations. Winds in India are influenced by the strong South-West summer monsoon, which starts in May-June, when cool, humid air moves towards the land and the weaker North-East winter monsoon, which starts in October, when cool, dry air moves towards the Ocean.
During the period March to August, the winds are uniformly strong over the whole Indian peninsula, except the eastern peninsula coast. Wind speed during the period November to March is relatively weaker, though stronger winds cannot be ruled out during a part of this period on the Tamil Nadu coast line in South India.