MITSUI E&S commercializes ammonia dual-fuel engines and AFSS

MITSUI E&S Co., Ltd. has completed the commercialization of large ammonia-fueled marine engines and ammonia fuel supply systems (AFSS). As the only company in Japan manufacturing both ammonia dual-fuel engines and AFSS, the company has established a supply framework for marine propulsion systems aimed at the practical implementation of ammonia-fueled vessels.

While ammonia holds promise as a next-generation fuel that emits no carbon dioxide during combustion, it is difficult to ignite and poses risks related to toxicity and corrosiveness, making safety, reliability and environmental performance crucial for its practical implementation. In February 2026, MITSUI E&S conducted land-based tests involving the integrated operation of the ammonia dual-fuel engine “MITSUI-Everllence B&W 7S60ME-C10.5-LGIA-HPSCR” and the AFSS, witnessed by ClassNK, and verified their performance. Following the completion of the tests and subsequent review, the company confirmed the completion of onshore testing in accordance with classification society rules and verified compliance with IMO NOx regulations through NOx certification. As a result, MITSUI E&S has finalized the commercialization of the ammonia dual-fuel engines and the AFSS and is now able to supply them for actual vessels.

MITSUI E&S has already decided to expand its land-based testing facilities for AFSS compatible with both Everllence and WinGD licensed engines. In conjunction with this, the company will establish a mass-production system for both the engines and the AFSS to meet the anticipated rise in demand.

MITSUI E&S is expanding its engine lineup to accommodate a diverse range of next-generation marine fuels, including ammonia, and by leveraging its strength in offering ammonia-fueled engines and AFSS as an integrated package, aims to contribute to the decarbonization of maritime transportation.