Question : State advantages and limitations in harnessing wind energy.

1.	Question : State advantages and limitations in harnessing wind energy.
Answer» SOLUTION :Advantages of wind energy : (1) Wind energy is an environment friendly. (2) It is efficient source of renewable energy. (3) It requires no recurring expenses for the production of electricity. Limitations in harnessing wind energy : (1) Wind energy farms can be established only at those places where wind BLOWS for the greater part of a year. (2) The wind speed should 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. For a 1 MW generator, the farm needs about 2 hectares of land. (5) The initial cost of establishment of the farm is quite high. (6) The tower and blades need a high level of maintenance as they exposed to the vagaries of nature like rain, SUN, storm and CYCLONE.

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