There are three basic ways to tap the ocean for its energy. We can use The ocean's waves. The ocean's high and low tides . Temperature differences in the water. 1-Wave Energy Kinetic energy (movement) exists in the moving waves of the ocean. That energy can be used to power a turbine. The wave rises into a chamber. The rising water forces the air out of the chamber. The moving air spins a turbine which can turn a generator. When the wave goes down, air flows through the turbine and back into the chamber through doors that are normally closed. 2-Tidal Energy Two types of tidal plant facilities. Tidal barrages Tidal stream generator

2. Coal
23%
Natrral Gas
22%
Petroleum
40%
Nuclear
8%
Hydroelecric
3%
Biomass
3%
Geothermal
1%
Solar
0%
wind
0%
other
1%
Coal
Natrral Gas
Petroloum
Nuclear
Hydroelecric
Biomass
Geothermal
Solar
wind

3. There are three basic ways to tap the ocean
for its energy. We can use
1. The ocean's waves.
2. The ocean's high and low tides .
3. Temperature differences in the water.

4. Kinetic energy (movement) exists in the moving waves of the ocean.
That energy can be used to power a turbine. The wave rises into a
chamber. The rising water forces the air out of the chamber. The
moving air spins a turbine which can turn a generator.
When the wave goes down, air flows through the turbine and back
into the chamber through doors that are normally closed.

8. Two types of tidal plant facilities.
• Tidal barrages
• Tidal stream generator

9. Tidal
Tidal barrages make use of the potential
energy in the difference in height (or head)
between high and low tides.

11. La Rance Barrage
The largest tidal power station in the.
world
Generated by its 24 turbines.
With a peak rating of 240 Megawatts.
Power 240,000 homes.

14. Tidal
A similar way to wind
turbines that use wind
to power turbines
Make use of the kinetic energy of
moving water to power turbines.

18. Uses the temperature difference between cooler
deep and warmer shallow or surface ocean waters to
run a heat engine and produce useful work, usually in
the form of electricity.
Power plants can be built that use this difference in
temperature to make energy. A difference of at least
38 degrees Fahrenheit is needed between the
warmer surface water and the colder deep ocean
water.

21. • Once you've built it, tidal power is free.
• It produces no greenhouse gases or other waste.
• It needs no fuel.
• It produces electricity reliably.
• Not expensive to maintain.
• Tides are totally predictable.

22. A barrage across an estuary is very expensive to
build, and affects a very wide area - the
environment is changed for many miles upstream
and downstream. Many birds rely on the tide
uncovering the mud flats so that they can feed.
Fish can't migrate, unless "fish ladders" are
installed.
Only provides power for around 10 hours each
day, when the tide is actually moving in or out.
There are few suitable sites for tidal barrages

23. References
• Tidal energy update 2009
Applied Energy , Volume 87, Issue 2 , February 2010, Pages 398-409
Fergal O Rourke, Fergal Boyle, Anthony Reynolds
• http://www.travelandtransitions.com/stories_photos/evangeline_trail.htm
• http://www.emec.org.uk/
• http://www.darvill.clara.net/altenerg/tidal.htm
• http://www.energyquest.ca.gov/story/chapter14.html
• http://www.answers.com/topic/ocean-thermal-energy-conversion
Ocean Energy 6
Coordinating Lead Authors:
Anthony Lewis (Ireland) and Segen Estefen (Brazil)
Lead Authors:
John Huckerby (New Zealand), Kwang Soo Lee (Republic of Korea), Walter Musial (USA),
Teresa Pontes (Portugal), Julio Torres-Martinez (Cuba)