1. Tidal Energy Brandi Alfaro Sheyla Gonzalez

2. http://www.darvill.clara.net/altenerg/tidal.htm • http://www.alternative-energy-news.info/technology/hydro/tidal-power/ • http://www.solarfeeds.com/ecofriend/16720-in-focus-tidal-energy

3. Howit Works • Tides are created by the flowing of water due to the gravitational interaction between the moon, sun, and rotating planet. • tidal energy is an energy source direct result of tide shifting from low to high. • There consistently has to be a 16 feet (5 m) difference • There are 20 sites that are suitable for a tidal power station • Not one can be found in the US  • Tidal power is harnessed in a couple of ways: • kinetic energy that powers turbines as the water moves between flow and ebb tide, • potential energy in which barrages are used to the difference between high and low tide.

4. How does it produce energy? • Tidal power is harnessed in a couple of ways: • kinetic energy that powers turbines as the water moves between flow and ebb tide • potential energy in which barrages are used to exploit the difference between high and low tide. • Tidal Turbines

5. Tidal Barrage • Huge dam built across a river estuary. • the water flows through tunnels. The ebb and flow of the tides is used to turn a turbine, or can be used to push air through a pipe, which then turns a turbine. • Process • water flows in the basin/estuary • Turbines spin as the water flows to the basin/estuary • gates open and the water flows back to the seas • tide recedes out through the barrage • while water travels from basin to sea, the turbines are spun again

6. Highest tides (tide ranges) of the global ocean Country Site Tide range (m) • Canada Bay of Fundy 16.2 • England Severn Estuary 14.5 • France Port of Ganville 14.7 • France La Rance 13.5 • Argentina Puerto Rio Gallegos 13.3 • Russia Bay of Mezen (White Sea) 10.0 • The largest tidal power station in the world (and the only one in Europe) is in the Rance estuary in northern France, near St. Malo.

7. Pros and Cons

8. Why should we use it? • The initial cost of creating a barrage is high. • This problem could be solved by: • government funding and/or large organizations • In terms of long term costs, once the construction is complete, there are: • very small maintenance and running costs • turbines only need to be replaced every 30 years • life of the barrage is indefinite • it will receive free fuel from the tide its entire life