In mid-July, the department's Mineral Management Services, which controls the mineral rights on federal lands, asserted its jurisdiction over renewable energy projects--wind, wave, solar and tidal energy--on federal waters in the Outer Continental Shelf.

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Ambitious plans for offshore renewable energy projects are crowding the waters--floating wind farms, tidal-power turbines and wave-energy barges--all expected in the next decade.

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Their presence in the colder northern waters is thought to be due to wind and tidal factors.

BBC: Deadly jellyfish return to coast

The scheme is part of efforts to develop the Pentland Firth and waters surrounding the Orkney Islands in the largest planned wave and tidal generating programme in the world.

BBC: Pentland Firth tidal project set for development