• 2023 March 24 16:55

    Ocean Thermal Energy Conversion demonstration project in Okinawa selected by Japan's Ministry of the Environment

    Mitsui O.S.K. Lines, Ltd. announced that an Ocean Thermal Energy Conversion (OTEC) demonstration project using deep ocean water on Kume Island, Okinawa Prefecture, which is being undertaken by MOL, Xenesys, Inc. and Saga University, has been selected by the Ministry of the Environment for the "FY2022 Technology Development and Demonstration Project for Regional Symbiosis and Cross-Sectoral Carbon Neutrality", according to the company's release.

    Since April 2022, MOL, along with Saga University and Kumejima Town, has participated in the operation of the only Ocean Thermal Energy Conversion Demonstration Test Facility in Japan owned by Okinawa Prefecture, which is maintained and managed by Xenesys, and accumulate OTEC operation know-how. The aim is to achieve the world's first commercialization of OTEC on a 1 MW scale by around 2026.

    The demonstration project includes manufacturing large, parallel-type titanium heat exchangers equivalent to 200 kW of power generation and verifying their performance from FY2022 to FY2024, aiming to establish large-scale heat recovery technology from seawater for the commercialization of OTEC.

    OTEC uses the temperature difference between warm water in the surface layer and cold water in the deep sea to generate electricity. Deep ocean water is pumped up from a depth of 600m or more and the energy is extracted from the temperature difference between the deep ocean water and the surface ocean water. Since OTEC is not greatly affected by weather conditions, it is capable of stable power generation 24 hours a day, ensuring stable and predictable power output.

    Another benefit of OTEC that is drawing attention is that even after deep ocean water is used for power generation, the water quality is unchanged, and the temperature is still low enough to be used for secondary purposes such as fisheries, agriculture, and air conditioning.

    Although research has been conducted in Japan, Hawaii, South Korea, and the Republic of Nauru, commercialization of this power source has not yet been achieved. MOL aims to quickly commercialize OTEC power generation in Japan and overseas through the operation of the Ocean Thermal Energy Conversion Demonstration Test Facility owned by Okinawa Prefecture, the verification research of feasibility and dissemination of OTEC in Mauritius, and this demonstration project, utilizing the knowledge and expertise it has accumulated through its offshore business and supply chain network.

    The combined use of deep ocean water as a regional resource for OTEC, fisheries, and other fields is also known as the "Kumejima Model," and for more than 10 years, Kumejima Town in Okinawa Prefecture has been working steadily toward the realization of a decarbonized society and a regional recycling symbiosis zone. The commercialization of OTEC is in line with Kumejima's policy for increasing energy self-sufficiency through renewable energy (Kumejima Town Energy Vision 2020), and the project is being promoted in cooperation with the town.




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