Approximately 70% of CO2 emissions at construction sites originate from diesel fuel. In efforts to reduce these emissions, the introduction of hydrogen-powered construction equipment, alongside the adoption of biodiesel fuels and electrification technologies, is considered to be one effective approach.

Since 2023, Komatsu has been conducting PoC tests of its FC excavator (*2), confirming powerful excavation performance and high operability, comparable to diesel engine-powered models, along with the added benefits of zero exhaust emissions and reduced noise and vibration. Compared to battery-powered models, hydrogen-powered systems offer higher energy density and output, making them a promising power source option for achieving carbon neutrality at jobsites that use medium-sized hydraulic excavators.

At the same time, Komatsu recognized the need to validate performance in actual operations and to establish practical hydrogen refueling methods to move toward broader social implementation.

Obayashi Corporation, Iwatani Corporation and Komatsu will use the insights gained from this PoC test to further develop construction equipment outfitted with hydrogen fuel cell system, explore mobile hydrogen refueling systems, identify suitable jobsites for implementation, and establish operational standards, while verifying hydrogen refueling methods for construction equipment under various site conditions.

• Obayashi Corporation will study to define criteria for a refueling station setup within construction sites to support on-site deployment of FC excavators, while working improve awareness and competency among employees and partner company workers regarding the safe handling of hydrogen.
• Iwatani Corporation will explore the use of a mobile hydrogen refueling station equipped with liquefied hydrogen. This high-capacity, fast-refueling system is currently under development with support from the Tokyo Metropolitan Government (*3).
• Komatsu will continue its efforts toward the commercial production of medium- and large-sized construction machinery equipped with hydrogen fuel cells in the near future by conducting research and development.

By promoting the practical application of hydrogen fuel cell-equipped construction equipment and working with relevant authorities to establish a safe and efficient operational environment for hydrogen use, the three companies aim to reduce CO2 emissions at construction sites and contribute to the realization of a carbon-neutral society.