With advancements in technology and engineering, and not least political interest, there are now a variety of different floating wind technologies being promoted, each with its own unique design and approach to capturing wind energy. These range from simple floating platforms attached to the seabed, to innovative designs such as semi-submersible and spar-buoy concepts. However, few if any of these designs have so far been proven in full scale for large wind turbine generators. Many of them only exist as computer rendered images at an early stage of development. The designs that have come furthest have begun to involve the classification societies.