• Tidal energy is renewable and such
technology is very important today’s world
where global warning is becoming more
and more of an issue.
• Tidal action is caused by the gravitational pull
of the moon and sun upon the Earth as it
• 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
• 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.
• 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 wasn’t 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
THE TECHNICAL SIDE
• Traditionally generating tidal energy involves
constructing a dam wall across an opening of a
• 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
• 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.
• Water is a free resource
• No Pollution
• Is produced 24 hours a day all year round.
• Peak output coincides with peak energy
• It is 80% efficient, where as coal is only 30%
• It renewable.
•Tidal energy is not yet economically
•There are problems with the
transportation of electricity once it has
•The technology is still being developed
•Non renewable sources of energy are
preferred because they have already been
• 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
• 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
• This is far more expensive than coal and oil.
• 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 1990’s, Tidal Energy Australia
proposed a project for Doctor’s Creek near the
Kimberly town of Derby.
•The advantages of this design was that is provided energy around the
•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
•At high tide water would be let into the basin and at low tide it would be
•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
•There was great community support in Derby but after much debate the
government decided that attaining energy from fossil fuel was the
•There is still the potential for such projects in the future.
• 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
• Unfortunately, the best way to research this
is though trial and that is a risk in itself.
• 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.