1. Brandi Alfaro Sheyla Gonzalez
Tidal Energy
Brandi Alfaro
Sheyla Gonzalez

3. How it 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
England Severn Estuary
France Port of Ganville
France La Rance
Argentina Puerto Rio Gallegos
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