Dr. Scott Couch from the Institute of Energy Studies in Edinburgh, Scotland, is an expert on tidal and wave energy systems. We talked to him in Stromness, Orkney, about the current state of the technology and economic feasibility of marine energy projects. As I wrote in the Ocean Power blog on this site, Scotland is a world leader in marine energy, and Scott mentions various sites around the Orkney Islands, in particular the Pentlant Firth.