You can say that the idea behind the WaveRoller is back and forth, back and forth. The greatest difference between the WaveRoller and other similar products is that the WaveRoller are planted on the sea bed while the other products are floating on the surface like buoys. The products that are floating can be an impediment for boats and divers. With WaveRoller that's not a problem, they are deep under water so no one can see them or hear them for that matter. The measures of the WaveRoller is 4x4 meters and only one like that can generate up to 13 kilowatts by itself, but when it gets installed there is going to be many more than just one.
When the big plate is flapping around in the underwater waves the movement goes in to a generator and it generates electricity so the more the WaveRoller is moving the more electricity it generates.
One thing that's really good with WaverRoller is that it has no impact on the environment what we know about right now and besides it has no carbon dioxide emissions. Even though it’s just a prototype they have installed two WaveRollers outside the Portuguese cost and experts count on to install the WaveRoller world wide in a short matter of time.

If someone wants to read more about this new energy source:
http://www.aw-energy.com/
http://crave.cnet.co.uk/greentech/0,250000598,10001091,00.htm,
http://www.gadgetgrid.com/2007/05/04/waveroller-using-ocean-swells-to-generate-power/

On this picture you can see how WaveRoller is made and how it works.

This picture shows how much WaveRoller cost compare to other energy sources.