Energy From the Restless Sea

A group of entrepreneurs is harnessing the perpetual motion of the ocean and turning it into a commodity in high demand: energy. Right now, machines of various shapes and sizes are being tested off shores from the North Sea to the Pacific — one may even be coming to the East River in New York State this fall — to see how they capture waves and tides and create marine energy.
http://www.nytimes.com/2006/08/03/business/worldbusiness/03tides.html?_r=1&ref=business&oref=slogin