Wind Power has a versatility of uses. Wind turbines are used for charging batteries, bringing power to your home, and water pumping applications. These wind generators range from 400 to 65,000 watts. Wind Turbines start producing power at a wind speed of 7.5 mph. Make sure you live in an area that supports a wind generator. They increase their output through 45 mph winds and at speeds higher than 45 mph, the blades need to be slowed down to protect the equipment, however they are very efficient between 7.5 mph and 45 mph.