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What are the limitations of enegry that ...

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

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Due to attraction of the moon, there are high and low tides in the sea. Tidal energy is harnessed by constructing a dam across a narrow opening to the sea. A turbine fixed at the opening of the dam converts tidal energy to electricity. The limitations to such dams is due to scarcity of locations where such dams can be constructed.
Ocean thermal energy of the sea or ocean is also used to produce electricity but these plants operate if the temperature difference between water at the surface and water at the depth upto 2 km is `20^(@)C` or more.
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