Mitsui O.S.K. Lines,announced that the company teamed up with the City of Yokohama .  Idemitsu Kosan , and Mitsubishi Gas Chemical Company, I- collectively known as the “Five Parties” – to successfully complete Japan’s first ship-to-ship bunkeringof methanol vessel fuel at anchorage . Methanol fuel was transferred from the Eika Maru to the Kohzan Maru VII in the Yokohama District of Keihin Port. The Eika Maru is a coastal methanol transport vessel operated by Kokuka Sangyo and the Kohzan Maru VII is a dual-fuel, ocean-going, methanol-transport vessel operated by MOL, and both are chartered by MGC. This operation also used domestically produced biomethanol from MGC’s Niigata Plant, which is scheduled to be used as fuel for the future operation of the Kohzan Maru VII

(Ship-to-ship (STS) bunkering operation)

[Operation Summary]
Date: Friday, February 6, 2026
Location: Keihin Port Yokohama District NR Anchorage

Operation Vessel Specifications:

Methanol, a basic chemical, is used in a wide range of applications. It is also recognized as a clean-burning fuel, emitting low levels of CO₂, sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter (PM). In the shipping industry, adopting alternative fuels to replace heavy fuel oil is one strategy for reducing GHG emissions. Methanol is gaining attention as a promising alternative fuel due to its ease of handling within existing infrastructure, leading to an increase in orders for methanol-fueled vessels. Methanol produced from non-fossil sources-such as CO₂, waste plastics, and biobased feedstocks-enables carbon-neutral marine transport across its entire lifecycle.

The Ports and Harbors Bureau of Japan’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT) established standards for implementation procedures and safety measures regarding bunkering of methanol-fueled vessels through the “Study Group on the Formation of Methanol Bunkering Hubs” from 2024 to 2025. The bunkering operation at this anchorage was made possible based on findings from a methanol bunkering simulation conducted in Yokohama Port in September 2024 and other insights related to the domestic transport of chemicals, including methanol. Those insights were brought by multiple stakeholders, including the operators (the Five Parties). Stakeholders and MLIT, along with the Japan Coast Guard discussed procedures and safety measures for implementation, which contributed to the successful execution of this operation.

Anchorage bunkering is a highly convenient operational method already used for conventional marine fuels, and a similar rise in demand is expected for methanol bunkering. This project marks Japan’s first ship-to-ship methanol bunkering operation at anchorage for methanol-fueled vessels in service, representing a significant milestone in promoting methanol bunkering within Japan. Moving forward, stakeholders will systematically organize and visualize insights gained through post-operation verification of this project. The Five Parties expect that these findings will be applied to methanol bunkering operations involving other vessel types or in other regions of Japan. Building on this project as a starting point, MOL will continue advancing initiatives to further develop and promote methanol bunkering throughout Japan.

Since commencing operations of the world’s first methanol dual-fuel vessel in 2016, MOL has deployed eight such carriers, operating one of the world’s largest fleets of dedicated methanol carriers. To achieve net-zero GHG emissions across the entire MOL Group by 2050, as outlined in the “MOL Group Environmental Vision 2.2,” MOL is advancing the adoption of clean energy as one pathway toward this goal. The company aims to deploy 90 LNG/methanol-fueled vessels by 2030. Leveraging the expertise accumulated through its operational and maintenance experience, MOL will contribute to further reducing GHG emissions and achieving net-zero emissions.