GREEN electricity from Scotland could be run down the east coast of Britain through an undersea cable costing billions of pounds, the Crown Estate said yesterday.

The agency has commissioned an initial study to investigate the possibility of an off-shore transmission system which could distribute renewable energy generated in Scotland around the UK. The results, due in early spring, will assess the practicality of the marine route for power from wind farms, wave and tidal devices generated in the Scottish Highlands and Islands.

Ian Pritchard, Head of the Marine Estate (Scotland), said that the undersea cable would be intended to meet growing demand for sustainable sources of clean fuel in future years and as an alternative to help overcome difficulties in providing land-based transmission lines. However, it would not be an alternative to the surface cable, strung on pylons, which Scottish and Southern Energy wants to build between Beauly and Denny to transmit renewable power to an interconnector. It has run into vociferous opposition, particularly in rural Perthshire.

The system would consist of a number of High Voltage Direct Current (HVDC) cables and sub-stations connecting sources of generation with demand up and down the east coast of the UK.

"Supplying clean and sustainable green energy is a topic on everyone's agenda at the moment. Renewable power devices located in remote areas of the Highlands and Islands of Scotland are already operational.

"New technology will increase overall electricity generating capacity but transmission to the national grid is the key to long-term viability," said Mr Pritchard.