Glasgow-based marine energy developer Nautricity is to start pre-commercial testing of its CoRMaT marine device. The device uses a rotor system and aims to avoid installation difficulties often associated with tidal energy projects. It is not tied to the sea bed like traditional tidal turbines, but is instead attached to a surface float. The concept version of the device has produced electricity, and it will be commercially tested before the end of the year in Orkney.