MODEC, Inc. and Toyo Construction Co., Ltd. have jointly obtained approval in principle (AiP) from NIPPON KAIJI KYOKAI (ClassNK) for floating structure & tether system and tether pile foundation for TLP type floating offshore wind turbine. The acquisition of AiP was one of the tasks of the NEDO's Green Innovation Fund Phase 1 project, which was carried out by MODEC, Toyo Construction, Furukawa Electric Co., Ltd., and JERA Co., Ltd. The AiP has been obtained based on the drawings and related documents of the floating structure & tether system provided by MODEC and those of the tether pile foundation provided by Toyo Construction. In 2020, MODEC obtained AiP for the floating offshore wind turbines from DNV.

This time, for the demonstration project in Japan, both companies have obtained another AiP from ClassNK with the aim of preempting some of the evaluation items for Wind Farm Certification and Classification Surveys that will be required during the demonstration project. In acquiring this AiP, both companies also conducted a study on Japan's unique environmental conditions, such as earthquakes and tsunamis, and received valuable opinions from ClassNK, including the opinions of experts, which will be reflected in the design and the development during the expected demonstration project.