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

Explanation

(a) Limitations of extracting energy from winds :
1. it requires a lot of space.
2. It is not available everywhere and at all the times.
3. It may result in huge wear and tear.
4. Wind velocity must be sufficient. It should never be less than `15 km h^(-1)`.
(b) Limitations of extracting energy from wave :
1. Waves are possible only when a strong wind is blowing over the surface of sea wheeas tides depend upon the attraction of moon.
2. It is a very costly affair and difficult to manage it in sea.
(c ) Limitations of getting energy from tides :
1.Its cost is huge and is not possible to build such dams everywhere.
2. It is difficult to maintain and operate tidal wave dams deep in the sea.
3. Huge amount of slit deposited in the basis of the dam.