In Search of New Power Source, City Looks Underwater

They look like underwater windmills. And in late August, when six of them are dropped into the rapid currents of the East River alongside Roosevelt Island, these giant ''tidal turbines'' will begin harvesting about 150 kilowatts of electricity. If all goes well, an entire underwater wind farm of 200 to 300 sleek 15-feet-tall turbines will discreetly spin under the surface of the river by 2006, providing about 10 megawatts of electricity, enough to power more than 8,000 homes.


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