Renewable energy resources are generally defined as energy that comes from resources which are naturally replenished on a human timescale such as wind, sunlight, geothermal heat, and water in the form of rain, and tides, waves.Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to produce electrical power, windmills for mechanical power. Wind has been recognized as a source of energy, in some capacity, for several hundred years. People used wind as the sole power source for boats, to pump water, or grind grain.
