Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?

There is a need to harness non-conventional sources of energy because non-conventional sources of energy are environment friendly and doesn’t create any kind of pollution. Moreover, Non-renewable sources of energy are inexhaustible and can be used as an alternative source of energy because fossil fuels are limited and once they exhausted, they can’t be reused again. So, there is a strong need to switch to non-conventional sources of energy.

The two different ways of harnessing energy from ocean are:

Tidal energy: Due to the gravitational pull of Moon on Earth results in rise in the level of the ocean which causes high and low tides. The difference in the ocean-level results in tidal energy. This energy can be harnessed by construction of dams across the Sea.

Ocean Thermal Energy: The ocean thermal energy arises due to heating of water at the surface of sea or ocean by the radiations of Sun which results in heating of upper surface of ocean but the lower surface remains cold. This temperature difference is used to obtain ocean thermal energy.

Wave Energy: The kinetic energy which is possessed by the huge waves of the sea can be used for generating the energy in form of electricity. This energy is used for rotation of turbine and thus in production of electricity.