PORTLAND — A research vessel is visiting Portland, Maine, carrying the largest tidal energy turbine ever deployed in the U.S.

The Energy Tide 2 arrived on the city’s waterfrontthis  morning. The vessel and turbine are owned by Ocean Renewable Power Co. and are home-ported in Eastport, where Ocean Renewable’s prototype underwater power system is scheduled to be connected to the region’s electrical grid by the end of the year.

The 150-kilowatt unit will power up to 60 homes, and the company plans to install more units in the years ahead.

Ocean Renewable CEO Chris Sauer told a gathering Monday in Portland that tidal energy “is here to stay.”

The ship is visiting Portland for the EnergyOcean International Conference, which is being held Tuesday through Thursday at the Holiday Inn.

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