Mitsui E&S Moves Ammonia Dual-Fuel Engines and Fuel Supply Systems to Commercial Stage
Key Takeaways
- •Mitsui E&S announced on 20 August 2026 that its ammonia dual-fuel engines and ammonia fuel supply systems have been commercialised and can now be supplied for actual vessels.
- •Integrated land-based testing of the 7S60ME-C10.5-LGIA-HPSCR engine and its fuel supply system was completed in February 2026, witnessed by ClassNK, with NOx certification confirming compliance with IMO requirements under MARPOL Annex VI.
- •The engine's HPSCR designation refers to a high-pressure selective catalytic reduction arrangement used as aftertreatment to control NOx emissions from ammonia combustion.
- •Mitsui E&S is expanding its fuel supply system testing facilities to support both Everllence- and WinGD-licensed engines and plans to establish a mass-production system as demand for ammonia-fuelled vessels grows.
- •Ammonia produces no CO2 when combusted and is viewed as a candidate bunker fuel for decarbonising shipping, an industry accounting for roughly 3% of global greenhouse gas emissions, with interest driven by the IMO's 2023 strategy targeting net-zero emissions by or around 2050.
Japan's Mitsui E&S has completed the commercialisation of its ammonia dual-fuel engines and ammonia fuel supply systems and can now supply the equipment for actual vessels, the company announced on 20 August 2026.
The milestone follows integrated land-based testing of the Mitsui-Everllence ammonia dual-fuel engine — a 7S60ME-C10.5-LGIA-HPSCR design — and its fuel supply system, which was completed in February 2026. Mitsui E&S, which manufactures two-stroke marine engines under Everllence licence, had earlier begun testing of the ammonia engine and fuel systems in Japan as part of the development programme.
The tests were witnessed by ClassNK, Japan's classification society, and verified the performance of both the engine and the fuel supply system. Mitsui E&S said the testing was completed in line with classification society rules, while NOx certification confirmed compliance with IMO requirements, the nitrogen oxide limits that govern marine engines under the MARPOL Annex VI framework. The engine's HPSCR designation denotes a high-pressure selective catalytic reduction arrangement, an aftertreatment technology used to control NOx emissions from ammonia combustion.
Mitsui E&S is also expanding its fuel supply system testing facilities to support both Everllence- and WinGD-licensed engines, and plans to establish a mass-production system as demand for ammonia-fuelled vessels grows.
The commercialisation marks a step forward for ammonia as a marine fuel. Ammonia contains no carbon, so its combustion produces no CO2, which is why it is viewed as a candidate bunker fuel for decarbonising shipping — an industry that accounts for roughly 3% of global greenhouse gas emissions — though its toxicity and NOx formation require careful handling and aftertreatment. Because ammonia has a high autoignition temperature and burns with a slower flame than conventional marine fuels, dual-fuel engines of this type ignite it with a pilot injection of conventional fuel. Everllence is the marine engine manufacturer formerly known as MAN Energy Solutions, while WinGD (Winterthur Gas & Diesel) is a Swiss-based designer of two-stroke marine engines.
Interest in ammonia and other alternative fuels is being driven by the International Maritime Organization's greenhouse gas strategy, adopted in 2023, which targets net-zero emissions from international shipping by or around 2050 and sets indicative checkpoints of 20–30% emission reductions by 2030 and 70–80% by 2040 compared with 2008 levels.
