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Ocean’s energy has been the source of relief for the environmentalists.

There are five technologies that fall within the category of marine hydrokinetics the basis of ocean energy:

>Tidal stream turbines often resemble like wind turbines placed underwater.
>Wave energy technologies more often look more like metal snakes that can span nearly 500 feet
>River hydrokinetic technologies
>Ocean current technologies are similar to tidal energy technologies, only they can tap into deeper ocean currents that are located offshore.
>Ocean thermal energy technologies take a very different approach to generating electricity, capturing energy from the differences in temperature between the ocean surface and lower depths, and can also deliver power 24/7.

Can you provide any examples of such technologies that are used already?