they provide wind energy Wind power consists of turning energy from the wind to other energy forms. Windmills have been in use since 2000 B.C. developed in Persia Wind energy is the fastest growing mode of electricity Wind farms can be constructed in off shore locations Wind energy is renewable and pollution free source of energy Most of the modern wind turbines have 3 blades The largest wind turbine in the world is located in US in Hawaii The first modern wind turbine was built in 1940’s in Vermont.