“ The UK could probably provide around a fifth of its electricity from wave and tidal energy , and that ’ s about the same as nuclear is doing currently ” explains . “ One starts with a basic ‘ bathtub ’ idea at technology level one , and progresses from there . We are probably at levels 5 and 6 , where largescale prototypes have been put into the sea and have been found to work with varying degrees of success .” Companies of all sizes , from major utilities to small-and-medium enterprises , are taking their prototypes to Orkney to test their fitness for the