Sources indicated on 18 September 2026 that Japan Engine Corporation has completed what it describes as the world’s first hydrogen-fuelled engine for large commercial vessels, the 6UEC35LSGH, developed jointly with Kawasaki Heavy Industries and Yanmar Power Solutions as part of NEDO’s Green Innovation Fund Project / Next-Generation Ship Development, and that greenhouse gas emissions from the engine are reduced by more than 95% compared with conventional heavy-fuel-oil engines.
The initiative sits under NEDO’s Green Innovation Fund Project / Next-Generation Ship Development and brings together the three Japanese manufacturers in a collaborative development programme. The partners are identified as Japan Engine Corporation, Kawasaki Heavy Industries, Ltd and Yanmar Power Solutions Co., Ltd.
Japan Engine has completed the 6UEC35LSGH, which the companies present as a hydrogen-fuelled engine designed for large commercial vessels. The model name supplied in the report is 6UEC35LSGH.
The report states that greenhouse gas emissions from the hydrogen-fuelled engine are reduced by more than 95% when compared with conventional heavy-fuel-oil engines. That figure is presented in the source material published on 18 September 2026.
The development is described alongside work on MHFS within the same project framework. The partners are jointly developing a programme referred to as "Development of Marine Hydrogen Engines and MHFS."
Industrial collaboration and funding Japan’s New Energy and Industrial Technology Development organisation funded the project through its Green Innovation Fund, placing the work within a wider national push to explore next-generation ship technologies. The three manufacturers are recorded as cooperating on engine and system development under that umbrella.
Scale and target application The engine is designated for use in large commercial vessels, signalling that the partners have targeted marine applications beyond small auxiliary or demonstration units. The report presents the completion of the 6UEC35LSGH as a milestone in that context.
The published account does not set out operational timelines, deployment plans, trial schedules or commercial roll-out details. It confines itself to the completion of the engine model and the stated emissions comparison with conventional heavy-fuel-oil engines as reported on 18 September 2026.
Taken together, the announcement frames the development as part of a government-supported effort to pursue low‑carbon propulsion technologies for shipping. The report from reports is the source of the details summarised here.