(Bloomberg) -- When the tide rushes into New York Harbor, a strange thing happens at the Gristedes supermarket on Roosevelt Island. The freezers, cash registers -- even the red neon ``Bagels'' sign -- hum with electricity from the rip coursing up the East River.
The power comes from six underwater turbines bolted to the river bottom by a little-known startup called Verdant Power LLC. Their 7-foot-long blades turn, silent and out of sight, until the flux crests. When the tide turns, the contraptions pivot 180 degrees and make juice on the ebb.
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