It will be the first US months-long test of a floating turbine platform in deep water.

The site will be in state-owned waters at least 60 metres deep, 4.8km south of Monhegan Island in the Atlantic Ocean. Plans call for sea-testing one or two 100kW prototypes for up to five months.

The consortium obtained 14 conceptual designs for floating turbine platforms.

Dagher and his colleagues grouped them in three categories: ballast stabilised — a spar buoy with catenary (not taut) mooring and drag-­embedded anchors; buoyancy stabilised — a barge with catenary mooring lines; and a tension-leg platform with suction-pile anchors that are stabilised by a mooring line.

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