Hydrogen power has long been seen as a key to cleaner transportation. Many big automakers have worked on fuel cell technology for years, but progress has often been slow and costly. When people think of advanced Japanese or Asian automakers, they usually name a few familiar brands known for hybrids and electric vehicles, while others remain less known despite quietly advancing their technology. As Asian brands have always been in the forefront of innovation, it couldn’t be different for this brand.
Cut emissions for a greener future: Asian manufacturers ahead of everybody else
With growing pressure to cut emissions and find better green solutions, companies across the region are stepping up their efforts more aggressively. The demand for powerful and efficient “water engines” is rising fast as governments and consumers push for cleaner alternatives that can deliver real performance and longer ranges. This shift is reshaping how automakers approach fuel cells and the potential they hold for heavy-duty and high-performance applications.
Now, a lesser-known Asian brand has quietly developed an engine delivering an impressive 500 kilowatts of pure power—far beyond what many expected. Their new design and engineering approach combine cutting-edge fuel cell technology with advanced system integration. This breakthrough has already grabbed the attention of industry leaders, signaling that something major is about to change in the world of hydrogen propulsion.
Mitsubishi’s new engine: 6 cylinders and running on hydrogen
Mitsubishi is pushing forward with hydrogen combustion engines as a key part of the company’s Mission Net Zero plan, which targets net-zero emissions by 2040. In 2021, MHIET proved it could run a single-cylinder engine fully on hydrogen. The engine, developed from its GSR series and tested at Japan’s National Institute of Advanced Industrial Science and Technology (AIST), showed stable combustion with 100% pressured water as fuel.
Now, the company has built a six-cylinder, 500kW-class power engine generator and with a supply facility. The facility delivers high-pressure hydrogen gas via trailers to the generator under reduced pressure. After initial tests running on city gas, MHIET plans to run the system at full load before the end of the fiscal year to confirm stable operation.
One or multiple cylinders: higher number for Mitsubishi worked better
Mitsubishi Heavy Industries Engine & Turbocharger (MHIET), recently completed a trial run of a 500kW-class hydrogen engine generator at their Sagamihara plant. The engine operated at a rated output of 435 kW at 1,500 rpm using 100% clean fuel. Following safety and reliability checks, the company is now accelerating development toward commercial use.
Unlike previous tests with single-cylinder engines, this demonstration involved a full 6-cylinder, 500kW-class engine generator set designed and built in-house, along with auxiliary equipment equipped with enhanced safety features for the renewable source of energy.
The test covered the entire system — engine, generator, and supporting equipment — through a complete operational cycle from startup, power generation at rated output, to shut down, confirming stable performance and effective safety responses during emergencies.
Should they launch before Caterpillar’s new engine hit the market?
Reciprocating engines like this one can run on various fuels, making them a promising technology in the shift to a low-carbon society. MHIET plans to build on these results with further reliability and safety tests, aiming to bring this technology to market and contribute to wider adoption.
The engine appeared to be powerful running on hydrogen, but Mitsubishi doesn’t have a big window to launch this product. In 2026, Caterpillar will be ready to commercialize a methanol engine, and this could leave the current technologies behind as this type of engine showed to be the best option for the current needs of ships and boats. Could Mitsubishi involve to methanol as well?
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