What is Tidal energy?

Tidal energy is a form of hydropower that converts the energy of the tides into electricity or other useful forms of power. The tide is created by the gravitational effect of the sun and the moon on the earth causing cyclical movement of the seas.

Tidal Energy Turbines


What types of Tidal Power Systems exists?

In the main, there are two types of tidal harvesting technology namely tidal barrage and tidal stream turbines.

  • Tidal barrage systems

Tidal barrage systems involve the trapping of water at high tide, most commonly at a point near the mouth of a river estuary or a bay, followed by the controlled release of the water back to the sea through turbines working on essentially the same basis as an upstream hydroelectric dam.

  • Tidal stream turbines

Tidal stream turbines harness the power of both the inflows and outflows of tidal energy. The tide flows through the stationary turbines, causing them to turn using the same principal as a wind turbine. There are various different designs of tidal stream turbines such as seabed standing and surface floating designs. While tidal barrage technology is a firmly established technology, tidal stream technology is in its infancy.  Recently however, the world’s first commercial scale tidal power generating device was installed in Strangford Lough, Northern Ireland.



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