Abstract
Initial capital cost for floating offshore wind farms is assessed considering manufacture and
installation technologies. Engineering cost models for floating offshore wind farms are proposed and the
cost parameters are evaluated based on the database. The baseline model is built for the floating offshore
wind farm with six wind turbines in Japan. The cost reduction effect by the novel technologies of the flat
panel welding method for the floater, the hybrid mooring line, the floating-to-fixed turbine installation and
mooring line installation using AHTS is quantitively evaluated by using the proposed engineering cost
model. It is found that CAPEX reduces 15 % comparing to the conventional technologies. The sensitivity
study using the engineering cost model is conducted and the scenarios for the initial capital cost reduction
in Japan are discussed.
