1. Gabriella Badurek Sabrina Tan

2. Tides vs. Waves Alternate rising and falling of the sea Occurs twice in each lunar day Controlled by the moon Kinetic energy that moves across the ocean’s surface

3. Process of Tidal Waves As the high tide comes, the water rises on one side. The water funnels through a tidal turbine or a barrage (dam)that which then triggers the turbine to convert the energy into electricity. One way tidal energy is converted into electricity is using a dam. At some points turbines and sluice gates are installed. When one side of the dam is high the gates open. The water flows through turbines and then turns a generator to convert the energy into electricity. Tidal energy is only efficient if the tidal range is at 4 meters.

4. Continued… The process continues back and forth on each side which makes tidal waves a renewable source. Tidal energy can be exploited in 2 ways: 1. By building barrages/dams in water ways 2. Harnessing offshore tidal streams

6. 2 Types of Tidal Generators 1. Barrage (Dam) Converts tidal energy by forcing water through a turbine, activating a generator Found in rivers and other natural waters 2. Tidal Turbines Relatively cheap Can be built whenever and able to be extended at any time

9. Benefits Renewable Because the moon controls the water, the tides are predictable Turbines create energy used to kill fish, but now are being replaced with friendly turbines for fish Does not consume fuel No noise pollution or gaseous emissions

10. Limitations Does not produce a lot of electricity Construction of the dam is expensive Only capable of working with water Because the water in the dam and the sea aren’t exchanged often, phytoplankton and bacteria can grow Fishes used to be killed in the turbines

11. Le Rance Tidal Power Plant 1960’s – Near St. Malo, France 24 bulb type generators Each bulb generates 10MW (megawatts) of electricity as the tide comes in and out The La Rance barrage produced 240 megawatts of power since 1966. Able to generate power for 4% of homes in Brittany

12. Le Rance

13. East River, NYC 6 turbines were placed into the East River in NYC which supplies some energy on Roosevelt Island. On December 31st 2006 was when electricity was first generated from the NYC turbine generators. The turbines used in the East River are axial-flow rotor turbines which have three radial blades.

14. Other Facts Tidal power is economically competitive and it produces electricity with prices similar to wind power according to Electric Power Research Institute. Tidal power was also used in Normandy. Novia Scotia Power generated up to 20 megawatts of power since 1984 in the Bay of Fundy..