Cracks me up the news on both coasts have been making noise about google's barges and its secret projects on the water. Given Googles involvement in developing alternative power sources it shouldn't take a rocket scientist to sort out Google has decided to get into developing tidal or wave power generation systems.
Typical to Google's MO they wait till someone else has more or less sorted out a good design then take it from there. See front page, the air vs water level concept has been used for a long time some folks in Germany have used this concept on rivers where a box fills full of water via river flow forcing air through a fan ='s electricity when the water level hits a fixed point it trips a manual gate switch and the water is dumped spinning the fan the other way sucking air in - repeat the cycle and you have power generation taking place for remote locations where power is hard to get otherwise. The wave system on the front page is the same idea in general.