Tidal energy generation

There are two forms - tidal stream energy and tidal barrages.

A barrage is a dam across, for example, an estuary, with turbines embedded in it. It works best if there is a large tidal range. They get energy from the difference in height between the two sides as the tide goes in and out. The main problem is that such projects have a huge impact on wildlife and also shipping.

Tidal energy comes ultimately from the Earth’s rotation energy. It will last a very long time.

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