A new facility for testing wave and tidal renewable technologies, due to be opened in 2013 for the University of Edinburgh. The UK has some of the world’s best marine energy resources and is a world leader in the research, development, and deployment of wave and tidal energy systems. Presently device developers test their designs at 1/100th scale then immediately face the huge financial leap to quarter or full scale testing at sea. This facility will bridge the gap by reproducing repeatable combinations of waves and tidal currents found at sea at scales between 1/40th and 1/10th. It will be the first of its kind in the world. At the heart of the building is a 30m diameter, 5m deep tank, containing a ring of current generators and wave makers. A rising floor gives access to the water and an overhead crane allows movement of models and instrumentation trusses. Support accommodation includes a model workshop, office and meeting space. The design has involved extensive coordination between architect, engineer and specialist designer, Edinburgh Designs Ltd. The building has a simple framed structure and low cost metal cladding. It is naturally ventilated and has high levels of insulation and airtightness. Predicted carbon emissions are significantly lower than 2010 building regulations.