What are the limitations of the energy that can be obtained from the oceans

Q No. 2:

What are the limitations of the energy that can be obtained from the oceans?

Ans:

Tidal energy, wave energy, and ocean thermal energy are various forms of energy that can be obtained from the sun. But there are several limitations to harness these energies. Those limitations are

(i)High dams are required to be built to convert tidal energy into electricity which incurs lot of cost.

(ii)       Very strong waves are required, which are not possible all the time.

(iii)     Tidal energy depends on the relative positioning of the Earth, moon, and the Sun. 

(iv) To harness ocean thermal energy the difference in the temperature of surface hot water and the cold water at depth must be 20ºC or more.