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EASTPORT, Mass.-- A green bulb switches on during a tidal energy demonstration to show green power being used to charge a Coast Guard 41-foot Motor Life Boat battery, Aug. 24, 2010.
The Energy Tide 2 uses a turbine to create grid compatible energy stored in batteries.
U.S. Coast Guard photo/Petty Officer Luke Clayton

EASTPORT, Mass.-- U.S. Coast Guard, Ocean Renewable Power Company and congressional delegate members view the Energy Tide 2, a tidal energy platform, during a demonstration, Aug. 24, 2010.
The Energy Tide 2 uses a turbine to create grid compatible energy stored in batteries.
U.S. Coast Guard photo/ Petty Officer Luke Clayton
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