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Propeller power
At the bottom of New York City's East River, beside the old tires and the unlucky wiseguys, sit six 20-foot propellers that turn slowly with the incoming and outgoing tide. The turbines generate enough electricity to support the Gristedes supermarket on nearby Roosevelt Island. Verdant Power hopes eventually to install enough turbines to power 5,000 homes in New York.

NEXT: Harnessing the ocean's power
LAST UPDATE: Jul 01 2008 | 1:08 PM ET
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