Tidal Power Station

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Tidal Power Station

• Group members
• Perian Bogdan
• Ghenea Madalin
• Tihu Mircea

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Phenomenon of Tidal Energy generation
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• This is the only form of energy whose source is
  the moon. Some other energy sources, nuclear
  power and geothermal energy for instance, have
  the Earth as their source. The remainder, fossil
  fuels, wind energy, biofuels, solar energy, etc.
  have the Sun as their source, directly or
  indirectly.

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• The tidal power is generated by the gravitational
  pull of the Moon on water. Due to these
  gravitational forces the water level follows a
  periodic high and low. The height of the tide
  produced at a given location is the result of the
  changing positions of the Moon and Sun relative
  to the Earth coupled with the effects of Earth
  rotation and the local shape of the sea floor.
• The tidal energy generator uses this phenomenon
  to generate energy. The higher the height of the
  tide the more promising it is to harness tidal
  energy.

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Tidal power types

• Tidal power can be classified into two main
  types
• Tidal stream systems make use of the kinetic
  energy from the moving water currents to power
  turbines, in a similar way to wind mills use
  moving air. This method is gaining in popularity
  because of the lower cost and lower ecological
  impact.
• Barrages make use of the potential energy from
  the difference in height between high and low
  tides. Barrages suffer from the problems of very
  high civil infrastructure costs, few viable sites
  globally and environmental issues.

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• Modern advances in turbine technology
  may eventually see large amounts of power
  generated from the ocean especially tidal
  currents using the tidal stream designs.

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• Tidal stream turbines may be arrayed in high
  velocity areas where natural flows are
  concentrated such as the west coast of Canada,
  the Strait of Gibraltar, the Bosporus, and
  numerous sites in south east Asia and Australia.
  Such flows occur almost anywhere where there are
  entrances to bays and rivers, or between land
  masses where water currents are concentrated.

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Advantages

• Reduced greenhouse gas emissions by tidal power
• Easy to predict
• Improved transportation because of the
  development of traffic or rail bridges across
  estuaries
• Not many places have dramatic enough tide
  change to support a tidal power plant
• Reduces dependence on fossil fuels
• Is a reliable, dependable source
• Renewable
• Produces no pollution

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Disadvantages

• Effect on plants and animals which live near
  tidal stations
• Very little is known about the full effect of
  tidal power plants on the local environment
  because so few have been built
• There are times of low power and high power
  because the tides have high and low periods
• Few places where tides are actually strong
  enough to produce amount able energy
• Could damage/destroy animals habitats
• Expensive construction of power plants
• Tidal fences can block paths for migrating fish

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Rance Tidal power plant

• The Rance tidal power plant is the world's
  first electrical generating station powered by
  tidal energy. It is located on the estuary of the
  Rance River, in Bretagne, France. It is operated
  by Électricité de France (EDF).

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• The construction necessitated draining the
  area where the plant was to be built, which
  required construction of two dams an effort
  which took two years. Construction of the plant
  proper commenced 20 July 1963, while the Rance
  was entirely blocked by the two dams.

• The construction took three years and was
  completed in 1966. Charles de Gaulle, then
  President of France, inaugurated the plant on 26
  November of the same year.

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• The idea of constructing a tidal power plant
  on the Rance dates to Gerard Boisnoer in 1921.

The site was attractive because there is a large
average range between low and high tide levels (8
metres, with a maximum equinoctial range of 13.5
metres). Nevertheless, work did not actually
commmence until 1961.
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The End
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