'World's biggest' tidal turbine unveiled in Scotland

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What is thought to be the biggest tidal energy turbine in the world has been unveiled in the Scottish Highlands, ahead of testing off Orkney.

The Atlantis Resources AK-1000, with blades measuring 18m in diameter, is designed to be capable of generating power for up to 1,000 homes.

Craig Anderson reports from the Invergordon docks on the Cromarty Firth.

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