Implementation of deepwater construction experiment offshore at Ishikari Bay for the verification testing project of floating offshore wind power generation by TLP method

　Toyo Construction Co., Ltd. (hereinafter the “Company”) is delighted to announce that it has
implemented the deepwater construction experiment using an ocean vessel (hereinafter the “Experiment”)
offshore at Ishikari Bay in Hokkaido for the verification testing project of floating offshore wind power
generation by TLP method.※１

 

　The Experiment is the on-site demonstration experiment of mooring foundation of which the
Company is in charge, as part of the “Development of TLP floating offshore power generation facilities
to realize low-cost and excellent social receptivity”※2 which the consortium, consisting of the Company,
MODEC, Inc., Furukawa Electric Industry Co., Ltd., and JERA Co., Ltd. was selected to conduct by the
New Energy and Industrial Technology Development Organization (NEDO) under the Green Innovation
Fund program.

　In the Experiment, we used the ocean vessel to verify the workability of foundation piles using large-
diameter and long steel pipe piles and to measure the design pull-out force.

　The Company already has various achievements in oceanic region and deepwater including the
exclusive economic zone (EEZ), and we believe that the accomplishment of the Experiment will lead to
a large step forward in the construction technology development of TLP mooring foundation.

 

　The Company raises the offshore-wind-power related business as a “growth driver” and is promoting
the business to make it our future core business. Particularly, we put priority and focus on developing
technologies for lowering costs related to the offshore wind power generation business. We will
contribute to the realization of carbon neutrality by 2050 by promoting various initiatives for offshore
wind power generation.

 

 

 

 

TLP method ※1

　TLP (Tension Leg Platform “tension mooring”) system is the method for
mooring floating by tension mooring to a seafloor foundation. TLP systems
are expected to reduce the cost of power generation because the high
stability of floating body in the ocean wave enables installation of large 15
MW-class wind turbines, which have the potential to become mainstream in
the future, on compact floating platforms. In addition, TLP mooring lines
are expected to be more socially acceptable than other mooring systems
because they can reduce the space occupied under the sea by 1/1,000
approximately and have less impact on existing businesses such as the
fishing industry and ship operations.

 

Project to Develop Cost-Reducing Technology for TLP Floating Offshore Wind Turbine ※2

　The Four Companies, including the Company, applied to the technology development program for cost
reduction of manufacture and installation of floating foundation for the “Project to Develop Cost-Reducing
Technology for TLP Floating Offshore Wind Turbines” for the realization of the 2050 Carbon Neutral
Declaration by the governments of Japan, proposed by NEDO under its Green Innovation Fund program
【R&D item: Phase 1-②】, and this component technology development project for approximately two
years was accepted on January 21, 2022.
　In addition to conducting simulations and demonstrations of component technologies previously studied by
each company — mooring foundations by the Company, floating and mooring systems by MODEC, and
power transmission systems by Furukawa Electric — a basic plan for a 15 MW-class power generation
demonstration facility will be drawn up based on design and environmental parameters provided by JERA
Co., Ltd. The Four Companies will also begin considering supply chains for mass production and cost
reduction with the aim of realizing commercial projects following the power generation demonstration.