A stretch of water off the north coast could provide enough energy to power about half of Scotland, engineers have found.
Researchers have completed the most detailed study yet of how much tidal power could be generated by turbines placed in the Pentland Firth, between mainland Scotland and Orkney.
They estimate 1.9 gigawatts (GW) could be available.
The in-depth assessment by engineers at the Universities of Oxford and Edinburgh offers valuable insights into how to develop and regulate this clean energy resource effectively. Find out more at http://www.ed.ac.uk/news/2014/energy-200114