Don Quixote's fictional exploits have thrilled us during our childhood. His futile attacks upon the windmills of La Mancha, in the mistaken belief that they were ferocious giants, are etched in many a memory. That mental picture could lead us to consider windmills to be relics of a bygone era. Wind power has played a significant role in the past. The ancients used the wind to help their ships sail. The Persians were the first to build windmills. The Dutch and, later, the American colonists used windmills to grind wheat and corn and to pump water. In fact, until the advent of power lines in the 1930s, small windmills were used to generate electricity in rural America. This scenario changed with the easy and cheap availability of fossil fuels like oil and gas. In modern times, the wind is increasingly finding favour as a renewable source of energy. Mankind is slowly beginning to realise that it needs to wean itself away from fossil-based fuels that will exhaust themselves in the next few decades. Consequently, it is necessary that a diverse array of energy sources be developed as a replacement. Winds blow all over Earth with intensities that vary diurnally, seasonally and spatially. Winds are, simply, air in motion. The Earth's surface is made up of land and water bodies. These are unevenly heated by the sun. During the day, air over the landmass heats up quickly, expands and rises. Cooler air from over the water bodies rushes to take its place, leading to sea breezes. The process is reversed during the night. On a global scale, too, large intensity atmospheric winds are generated and circulated due to the equatorial region getting more heat than the poles. Winds possess tremendous energy. This kinetic energy is tapped by allowing the wind to turn the blades of a windmill. The consequent spinning of a turbine within a generator leads to the production of electricity. A single windmill is capable of generating only a small amount of electricity. Hence, wind turbines are set up in clusters at