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 is therefore an entirely
predictable form of renewable energy, which can be harnessed in two forms:
Tidal Range
Tidal Range
is the vertical difference in height between the high tide and the
succeeding low tide.
Artificial
tidal barrages or lagoons may be constructed to capture the tide. Turbines in
the barrier or lagoon generate electricity as the tide floods into the
reservoir; water thus retained can then be released through turbines, again
generating electricity once the tide outside the barrier has receded.
Tidal Stream
Tidal Stream
is the flow of water as the tide ebbs and floods, and manifests itself as tidal
current. Tidal Stream devices seek to extract energy from this kinetic
movement of water, much as wind turbines extract energy from the movement of
air.
The sea
currents created by movement of the tides are often magnified where water is
forced to flow through narrow channels or around headlands. There are a number
of locations around the coastline of the UK where the tidal stream resource is
high, and it is in these areas where early technology developments are taking
place to explore the prospect of harnessing tidal energy.
Ramsey Sound
and St Davids Head, both in Pembrokeshire, are two such locations and where
TEL is testing and demonstrating its DeltaStream technology.
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