An underwater turbine that is set to be used in the world's first tidal farm near Islay has successfully completed initial tests in hostile waters off Orkney.
Scottish Power Renewables fitted their 100-foot long device at the end of last year and it's already powering the Orkney Island of Eday.
Scotland Tonight looked at the experimantal development, and spoke to Alan Mortimer, the Head of Innovation at Scottish Power Renewables.
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