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1. Tidal Barrages: Tidal barrages are
big dams built across an estuary to
capture the potential
energy generated by the change in head between high and low tides. As the
tide goes in and out, the water flows through tunnels in the dam. The ebb
and flow are used to either turn a water turbine or compress air through a
pipe that then turns a turbine, which generates electricity.
2. Underwater Turbines: Underwater
turbines are installed below water surface. As the
tides ebbs and flows, the underwater turbines
spin like windmills. The turbines are mounted on
a gearbox shaft, which rotates the electromagnet that generates
electricity. Underwater cables carry the
electricity to the shore, where it can be stepped up by
transformers and distributed to consumers through transmission lines.
Some links:
Tidal Power on Wikipedia
Tidal Power - Energy from the sea
Energy
Source - Tidal Power (Pembina Institute)
Blue Energy - Tidal Power
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