Komatsu Ltd. has commenced proof-of-concept testing for the world’s first large dump truck equipped with a hydrogen combustion engine. The concept machine, based on Komatsu’s flagship HD785 dump truck (with a 92-tonne payload), is now undergoing trials at the company’s Ibaraki Plant in Japan.
This marks a significant milestone in Komatsu’s drive toward carbon neutrality and is part of a broader strategy to explore low-emission power sources for heavy-duty equipment. The hydrogen engine and tank system have been co-developed with German startup KEYOU GmbH, which specialises in hydrogen engine technology for commercial vehicles.
The hydrogen tank is mounted beside the operator’s cab to maximise storage capacity, with additional safety and visibility enhancements, including new cameras and monitors, built into the cab. The current testing program will assess key performance metrics such as fuel efficiency, operating hours, and safety in handling high-pressure hydrogen gas.
Compared to battery or fuel cell alternatives, hydrogen combustion engines offer a cost-effective path to lower emissions by utilising existing diesel powertrain designs. This makes them especially attractive for mining companies aiming to cut CO₂ emissions without completely overhauling their fleets.
Komatsu is targeting a 50% reduction in CO₂ emissions from both its equipment and production operations by 2030, with full carbon neutrality set for 2050. The hydrogen dump truck joins Komatsu’s growing lineup of low-emission machinery, including battery-electric and tethered electric excavators.
While challenges remain—such as hydrogen infrastructure and safety standards—Komatsu says it will work closely with industry stakeholders to overcome these barriers. The company remains committed to open innovation and technological development that supports the transition to cleaner, more sustainable construction and mining operations.
