Question

a new energy source found in the ocean that is currently very costly to obtain

Answer 1

The new energy source found in the ocean that is currently very costly to obtain is OCEAN THERMAL ENERGY.

In it the temperature difference between surface water of ocean and water at the depth of ocean is used to generate electricity.

Usually the surface water of oceans is more hot than water at the depth. So, a volatile liquid like ammonia(NH3) is used to boil at the surface and the gas evolved runs the turbine and is cooled again at the depth.

This is not economic because the setup is costly and it needs a huge temperature difference with increasing depth. Also the energy generated is less.

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