What are the limitations in harnessing wind energy?

Wind energy is an environment-friendly and efficient source of

renewable energy. It requires no recurring expenses for the production of electricity. But there are many limitations in harnessing wind energy, that are:-

1. Wind energy farms can be established only at those places where wind blows for the greatest part of a year.

2. The wind speed should also be higher than 15 km/h to maintain the required speed of the turbine.

3. There should be some back-up facilities (like storage cells) to take care of the energy needs during a period when there is no wind.

4. Establishment of wind energy farms requires large area of land and also the initial cost of establishment of the farm is quite high.