What are the limitations of extracting energy from (a) wind (b) waves (c) tides?

(a) The wind:

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 also be higher than 15 km/h to maintain the required speed of the turbine.
3. Establishment of wind energy farms requires a large area of land.
   These are the limitations of extracting energy from the wind.
   (b) Limitations of extracting waves energy: The waves are generated by strong winds blowing across the sea. Wave energy would be a viable proposition only where waves are very strong.
   (c) Limitations of extracting tidal energy: The locations where such dams can be built are limited.