The Oxford University report, commissioned by the UK government/industry body the Energy Technologies Institute, suggests that the fast-flowing waters of the Inner Sound between the island of Stroma and the northeast tip of the Scottish mainland could be tapped for 16 terawatt hours a year.

"Pentland Firth promises to be one of the best sites in the world for tidal power," says lead author Thomas Adcock of Oxford University's Department of Engineering Science.

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