Ocean Energy There is a possibility of using ocean energy in future. We have three main options of using such energy. These are Ocean waves, high and low tides and lastly the temperature difference in its waters. Now let’s have a better look at each of them.    Wave Energy We can exploit the kinetic energy of waves to power a turbine. By a simple example we can demonstrate its practicality. By letting in the rising water to a chamber, the forced air out of chamber can drive a turbine connected a generator. If the wave goes down, the air flows back to the chamber, making it ready for another cycle. In another form of driving the waves move a piston up and down in a cylinder. At present, they are used I a small scale to power up a small light house.    Tidal Energy In another form of Ocean energy, the tides of water are trapped behind a dam. This water can be used similar to hydro electric systems. From as early as 11th century, this trick has been used to turn the water mills. To make it more workable, we need large differences between two tides. There are few places in the world to make it feasible. The most noticeable power plant in this kind is built in France with a capacity of 240 megawatt, powering 240.000 homes. The second largest, belongs to a Canadian power plant by only 17 MW.  Ocean Thermal Conversion Not a new idea, using the thermal energy of ocean dates back to 1881 in France. If you have tried ever swimming in deep waters, you must have noticed colder as you go deeper. Surface is warmer because sunlight warms it up. To build up a practical power plant, there must be a temperature difference of at least 38 degrees Fahrenheit. Using this type of energy has been demonstrated in Hawaii.