Tidal Barrage

In this method, power is harnessed from the tide by taking advantage of the varying sea levels which occur each day (two high tides and two low tides every 24 hours).

This is done by creating a dam (or ‘barrage’) across a bay or estuary. As the tide comes in (and, in some schemes, goes out), the water level on one side of the dam builds up.

Once this height difference (the ‘head’) has built up to its maximum, gates in the dam are opened and the water flows suddenly out, pulled downwards by gravity.

There are turbines positioned on the dam which rotate as the water flows over them and these power a generator which converts the energy to produce electricity.

This method of using the hydrostatic head (the height difference which causes flowing water) to push turbines attached to generators is the same principle used for hydroelectricity generated from a reservoir.

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