On June 8, 2018, New Energy and Industrial Technology Development Organization (NEDO) announced that NEDO and Hitachi Zosen Corporation have completed the construction of a barge-type floating body for a next-generation floating offshore wind power generation system. The key feature of the barge-type floating body is that it is smaller and lighter than the standard semi-submersible type floating body. The portion of the structure that is submerged under the water is minimized, which will enable wind farm operators to place this type of floating body in areas with approximately 50m of water depth.

This summer NEDO will set up the system, loading the floating body with a wind turbine and power cables at the demonstration site, which is approximately 15 km away from the Hibikinada district of the Kitakyushu Port. The system will start its actual operation this fall.

Based on the foundation structure supporting the wind turbine, offshore wind power generation can generally be divided into “bottom-mounted foundations,” which are fixed structures connected to the offshore foundations, and “floating-type” structures where the foundation is floating on the sea. According to NEDO’s research, the economic efficiency of floating-type wind power generation is higher than bottom-mounted wind power generation in the areas above 50m of water depth. In order to accelerate the introduction of offshore wind power generation, in addition to developing bottom-mounted wind power generation, it is essential for Japan to develop floating offshore wind power generation systems that can be placed into a wider area of shallow water, which led NEDO to conduct this demonstration project.