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Large propeller blades as those on wind-vane farms on
land exploit sea currents underwater. They too could be
grouped to form subsurface energy parks.
Large offshore multi-purpose platforms or more generally marine energy parks by con-
centrating energy production in a single area make transport ashore more convenient. In
the figures an offshore park some distance away from the coast and one which is close,
in which there’s also a coastal OWC.