Chapter 9

Tidal Barrage Power Plants


A tidal power plant relies on the ebb and flow of the tide to create a movement of water that can be used for power generation. To exploit this, a tidal barrage needs to be built across a tidal estuary so that water can be trapped on the incoming tide. This is then released when the tidal level has fallen, flowing through turbines to generate electricity. To be economical, a tidal power plant needs a large difference in sea level between high and low tide. Sites where this is available are limited. Tidal plants are relatively expensive to build compared to similarly sized hydropower plants, and construction is complex. Output normally only takes place during the ebbing tide. Such plants are extremely ...

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