\tIn areas which are very windy, windmills are erected. \tA windmill consists of a fan-like structure erected on a strong standing support at a considerable height.\tThe strong wind moves the wings of the windmill and this turns the turbines of the electric generato This mechanical energy is converted to electrical energy.\tSince the output of a single windmill is very small, many such windmills have to be erected in a carefully chosen place where there is consistent blowing of winds of atleast 15km/hr. This is known as a wind energy farm which are generally large (2 hectares of land)Advantages It is environment friendly.· Renewable source of energy· Only construction expense is involved, but the maintenance (or recurring cost) is less