The state of the art design tools that currently exist for traditional offshore wind turbines are not capable of modelling the unique characteristics of the X-Rotor offshore wind turbine, consequently new design tools beyond the state of the art must be created. These beyond the state of the art design tools include aeroelastic models, control models, structural models and maintenance models. At the end of the project these design tools were used to deliver an exemplary design of the X-Rotor concept. The impact of that exemplary design on the environment has also been determine with a particular focus on sea and bird life. The socio-economic impact of the exemplary design has been determined through engagement with host communities, the wider wind energy community and through economic modelling. It is hoped society will benefit from the project outcomes through reduced cost of energy from offshore wind. Lower cost wind energy is important for society as it will assist in accelerating the world’s transition to sustainable energy and will address the energy trilemma of cost, security of supply and sustainability.