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Scots pioneer floating sausage power

ENGINEERS IN Scotland are to test giant 150m floating sausage shaped electricity generators in Leith later this month ahead of a full scale installation off Orkney in January.

Wave energy firm Ocean Power Delivery (OPD) completed sea trials of a one seventh scale model of its Pelamis generator earlier this year.

Full scale tests of Pelamis's articulated joints, hydraulic rams, generators and power transmission systems will pave the way for the launch of a full-scale, 2.7GWh generator in January.

The 150m long, 3.5m diameter, 700t Pelamis generator is a floating structure, composed of five sausage shaped elements.

Its joints are articulated to allow heave and sway, and can take up to 60 Oof movement.

Moored in exposed water, the system is designed to undulate and sway with wave movement.

This action pumps a set of four hydraulic rams at each joint which drive a motor.

Power is transmitted to the shore via a sea bed transmission line.

Small-scale trials have shown that Pelamis will ride over small waves, maximising movement.

In rougher weather it is designed to 'dive through' waves so that joints avoid becoming overstressed and damaged.

'Wave farms' of up to 40 Pelamis machines would provide enough power to supply 20,000 homes, the OPD claims.

lTrials of the Stingray tidal stream power generator in Yell Sound, Shetland (NCE 19 September), has shown that electrical output broadly matched predictions.

INFOPLUS www. oceanpd. com

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