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In May 2024, we, MITSUI E&S, and our U.S. subsidiary, PACECO Corp., commenced commercial operations of the world's first Rubber-Tyred Gantry crane (RTG) "MITSUI-PACECO H2-ZE TRANSTAINER CRANE (H2-ZE TRANSTAINER)" equipped with hydrogen fuel cells (FC) at the Port of Los Angeles. The Port Authorities of Los Angeles and Long Beach established the "Clean Air Action Plan (CAAP)" in 2006, aiming to eliminate diesel exhaust emissions from port areas by 2030. The MITSUI E&S Group continues to challenge this ambitious goal of achieving zero emissions (ZE) at ports.

MITSUI E&S's RTG Leading Environmental Initiatives

Ports, which are crucial hubs in the international supply chain and through which over 99% of import and export cargo passes through, face urgent issues not only in terms of environmental considerations but also in enhancing port competitiveness.
Rubber-Tyred Gantry cranes (RTG), which are essential for container handling within container terminals, are powered by electricity generated by diesel engine generators mounted on the cranes, and therefore require measures against air pollution caused by exhaust gases.

Since the 2000s, MITSUI E&S has developed filters to remove particulate matter (PM) and nitrogen oxides (NOx). In 2009, we commenced sales of hybrid RTG that reduce fuel consumption and exhaust emissions by reusing regenerative electric power generated during cargo handling. As a pioneer in developing clean cargo handling equipment, we have delivered 370 units to ports in Japan and overseas.

Since 2012, we have also been providing electrified RTG that receive necessary power from external sources. In addition, we have developed and started selling FC RTG that use hydrogen as fuel, enabling the use of clean cargo handling equipment even at terminals where the installation of shore power supply facilities is challenging.

Environmental Initiatives for RTG

World's first RTG powerd by FC.

Beyond reducing exhaust emissions, and with the aim of realizing zero-emission ports, we initiated the development of FC-powered RTG in fiscal year 2021 under a NEDO* subsidized project.

In March 2023, at Oita factory, we completed the development of the world's first FC-powered "H2-ZE TRANSTAINER" which achieves cargo handling performance equivalent to that of conventional diesel engine generator-equipped cranes. Conventional hybrid RTG are equipped with a generator set composed of a diesel engine and a lithium-ion battery. By replacing the generator set with an FC power pack consisting of fuel cells and hydrogen tanks, and by increasing the capacity of the lithium-ion battery, all energy generated by the FC power pack can be stored in the high-capacity battery. 
This enables cargo handling operations to be performed solely using electricity supplied from the battery. 
Instantaneous power output is also achieved, realizing an RTG capable of steady-state operation using fuel cells.

Since 2024, under a NEDO-supported demonstration project, we have commenced commercial cargo handling operations of FCRTG at the Port of Los Angeles in the United States, achieving stable operating performance since the start of operations.

*NEDO: New Energy and Industrial Technology Development Organization

RTG equipped with FC Power Pack

Equipment Configuration of FC Power Pack

Towards a New Standard for Zero Emission Ports

We conducted demonstration projects to retrofit RTG to hydrogen-fueled systems at the Ports of Tokyo, Yokohama, and Kobe.
In October 2024, at the Oi Container Terminal, in collaboration with the Tokyo Metropolitan Government Bureau of Port and Harbor, Nippon Yusen Kabushiki Kaisha, UNI-X NCT CORPORATION, and Iwatani Corporation, we installed FC systems on RTG and commenced Japan’s first cargo handling operations using hydrogen-fueled RTG. Subsequently, demonstration operations were also launched at the Ports of Kobe and Yokohama, and all demonstration projects across the three ports have been completed. By replacing the diesel engine generator of in-service RTG with FC power generation systems, we confirmed that equivalent cargo handling performance can be achieved while using hydrogen, which emits no CO? during power generation.

The results of these demonstrations will be broadly deployed to promote the use of hydrogen in cargo handling equipment and contribute to the decarbonization of ports.