Watch the video and then read the transcript.

More details about wave power in this Greenpeace video :  Wave power : how it works.  (All the Greenpeace videos on YouTube  might interest you)     You can also have a look at a brochure about the Pelamis system (click « PELAMIS BROCHURE » at the bottom of the page.)

Watch this programme (BBC Channel 4 News, April 02, 2008) :  Marine Current Turbines (Strangford Lough, Northern Ireland)