TIDAL ENERGY INTRO Tidal energy is renewable and such

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TIDAL ENERGY
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INTRO

• Tidal energy is renewable and such technology is
  very important todays world where global warning
  is becoming more and more of an issue.

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TIDES

• Tidal action is caused by the gravitational pull
  of the moon and sun upon the Earth as it rotates.
• The movements of these bodies cause the surface
  of the oceans to be raised and lowered depending
  on their cycles.
• It is because of these complex cycles that the
  amount of energy retainable from the ocean varies
  with location and time.
• An advantage of tidal energy is that the amount
  of electricity retainable is very predictable and
  dependable.

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TIDAL ENERGY

• The basic concept of tidal energy is to capture
  the potential energy of the raising and lowering
  of the tides.
• The main advantage of tidal energy is that is it
  is renewable and dependable.

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HISTORY

• On a small scale, tidal power has been used
  throughout the history of mankind.
• In the Middle Ages, tide mills were common along
  the coast of Western Europe.
• It wasnt until the 20th Century that tidal
  power was considered as an alternative to the
  combustion of fossil fuels.
• The construction of the French Barrage across the
  Rance estuary

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TIDE MILLS
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THE TECHNICAL SIDE

• Traditionally generating tidal energy involves
  constructing a dam wall across an opening of a
  tidal basin.
• The dam wall has gates, which open to allow the
  water to come in as the tide rises. This happens
  at great pressure and turns the turbines to
  create electricity.
• The same process is then repeated when the water
  is let out back into the back into the ocean.
• This happens every high tide, that is why it is
  important to find a spot where the difference
  between low and high tide is significant.

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ADVANTAGES

• Water is a free resource
• No Pollution
• Is produced 24 hours a day all year round.
• Peak output coincides with peak energy demand.
• It is 80 efficient, where as coal is only 30
• It renewable.

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DISADVANTAGES

• Tidal energy is not yet economically feasible.
• There are problems with the transportation of
  electricity once it has been produced.
• The technology is still being developed
• Non renewable sources of energy are preferred
  because they have already been set up.

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ECONOMICS

• Tidal energy is not cost competitive because it
  is generally not commercially available.
• When selecting a spot to set up a tidal energy
  station it is important to make sure that it will
  be economically feasible.
• To set up a tidal facility with an average annual
  output of 1050 MW would cost about 1.2 billion
  dollars, not including maintenance and running
  costs.
• This is far more expensive than coal and oil.

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WHAT ABOUT AUSTRALIA?

• The potential for tidal energy is very high in
  North-Western Australia because the tidal ranges
  are among the highest in the world.
• The coast line there has several inlets and bays
  that are promising sites.
• These include the Walcott Inlet, Secure Bay and
  St Georges Basin.
• In the late 1990s, Tidal Energy Australia
  proposed a project for Doctors Creek near the
  Kimberly town of Derby.

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• The advantages of this design was that is
  provided energy around the clock.
• One basin would hold high water and the other
  would contain a low level of water.
• A channel cut between the two would hold the
  turbines for power generation.
• At high tide water would be let into the basin
  and at low tide it would be let out.
• The plant would have had a capacity to produce
  48MW and would have been the second largest in
  the world and the only one to provide a
  continuous output.
• There was great community support in Derby but
  after much debate the government decided that
  attaining energy from fossil fuel was the
  preference.
• There is still the potential for such projects in
  the future.

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ENVIRONMENTAL IMPACTS

• Tidal energy is renewable, so therefore it
  produces no harmful emissions and does not damage
  the environment in that way.
• However, there is little known about the effects
  of controlling water levels on aquatic
  ecosystems.
• Unfortunately, the best way to research this is
  though trial and that is a risk in itself.

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FUTURE?

• In a society with increasing energy needs, it is
  becoming more and more important to have
  alternative sources of power to keep up with the
  ever growing energy demand.
• The capacity of tidal energy exceeds that of coal
  and oil and is renewable.
• The Department of Energy has shown great
  enthusiasm in regards to tidal power as the
  perfect energy source for the future.

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BIBLIOGRAPHY

• TIDAL ENERGY
• http//europa.eu.int/comm/energy_transport/
  atlas/htmlu/tidalover.html
• Ocean Energy
• http//www.energy.ca.gov/development/oceane
  nergy/
• TIDAL ENERGY
• http//www.uwec.edu/grossmzc/minotc.html
• TIDAL ENERGY
• http//www.geology.wisc.edu/pbrown/g410/tidal/ti
  dal.html
• TIDAL ENERGY
• http//www.eere.energy.gov/RE/ocean_tidal.html
• TIDAL ENERGY
• http//www.renewingindia.org/tid.html

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THE END