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Last Updated: Wednesday, 13 June 2007, 23:14 GMT 00:14 UK
Swinging wave device to be tested
Archimedes Wave Swing. Picture courtesy of AWS Ocean Energy
An artist's impression of the Archimedes Wave Swing
A wave energy system which operates at least six metres (19ft) below the sea's surface will be tested off Orkney.

AWS Ocean Energy will have a demonstration version of its Archimedes Wave Swing installed by the European Marine Energy Centre (Emec).

The Ross-shire manufacturer's device is a cylinder-shaped buoy which is moored to the seabed.

Passing waves move an upper casing against a lower fixed cylinder and the movement is converted into electricity.

The Archimedes Wave Swing will be installed off Orkney next year with the support of a 2.1m Scottish Executive grant.

AWS said that because the system was submerged below the surface, it was "invisible" and would not cause a visual impact or become a hazard to shipping.

It can also survive violent storms, according to the Alness-based company.

Stromness-based Emec was set up to help companies develop marine energy schemes from the prototype stage.

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