Question

why Is Tidal energy not exploited on a commercial scale?

Answer 1

This is because it is only available at coastal areas and not in other areas

Answer 2

The tidal energy is not likely to be a potential source of energy because:
(i) Only few sites are available around the world which are suitable for building field barrages
(ii) The rise and fall of sea water during high and low tides is not enough to generate electricity on a large scale. 
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