Nicola Tesla dreamed of plucking energy from the air; Googlers dream of scooping electrical power from the sea. One of their ideas is to place computer centers on floating barges with an attached power plant to keep the computers running. But it won't be easy. So far, the only sea-related power generators work with wave action as it crashes to shore, and there aren't many of those. In one wave-action project, the whole thing sank into the water off the coast of Oregon. In others, wild seas have broken up the equipment or corroded it beyond use.