Mitsui E&S commercializes marine ammonia engine
By on August 31, 2026
Two-stroke, dual-fuel engines and fuel supply systems now available to customers
Click to learn more. Mitsui E&S’ ammonia dual fuel engine 7S60ME-C10.5-LGIA-HPSCR, built in Tamano, Japan on license from Everllence. Source: Mitsui E&S.
Japan-based Mitsui E&S has completed the commercialization phase of its two-stroke, ammonia-fueled marine engines and ammonia fuel supply systems (AFSS), now able to serve customers with both products from its Tamano manufacturing base. Having now established a full “supply framework for marine propulsion systems”, Mitsui E&S is focused on the “practical implementation” of ammonia-fueled vessels.
Mitsui E&S has been pursuing a Japan-based engine manufacturing setup based on the Everllence B&W ME-LGIA model, with the technology licensed to Mitsui E&S by Denmark-based Everllence (formerly MAN ES). The initial prototypes of the “MITSUI-Everellence B&W 7S60ME-C10.5-LGIA-HPSCR” engine went through technical testing in Tamano in early 2025. This February, Mitsui E&S conducted tests of the integrated operation of the engine and the AFSS, witnessed by class society ClassNK. This recently-completed onshore testing has confirmed compliance of the integrated engine-AFSS setup with International Maritime Organization (IMO) NOX emissions limits: a key regulatory and environmental threshold for ammonia-fueled marine engines. Mitsui E&S plans to expand its capabilities to produce AFSS integrated systems compatible with WinGD’s ammonia-fueled X-DF-A engine, and Tamano may potentially be a future manufacturing site for a WinGD-licensed engine model.
On the vessel front, Mitsui E&S is part of two long-standing partnerships to deploy marine ammonia engines:
- Mitsui O.S.K. Lines, Namura Shipbuilding and Mitsubishi Shipbuilding’s large-size ammonia-powered ammonia carrier (under development since 2021), will use an Everllence two-stroke engine built by Mitsui E&S.
- And (from Singapore Maritime Week 2024) K Line, ITOCHU, Nihon Shipyard, MAN Energy Solutions (MAN ES), and Mitsui E&S agreed to develop and build 200,000 dwt Newcastlemax-size bulk carriers at Nihon Shipyard, equipped with ammonia-fueled engines built by Mitsui E&S in Japan.
Click to learn more. The ammonia fuel supply system (AFSS), pictured at Mitsui E&S’ Tamano testing facilities. Source: Mitsui E&S.
The development of the AFSS utilized funds from the “Integrated Project for the Development and Social Implementation of Ammonia-Fueled Ships” scheme administered by Japan’s New Energy and Industrial Technology Development Organization (NEDO). Expansion of the AFSS for onshore testing will be in part funded by the “Project to Promote the Construction of Zero-Emission Ships,” a joint initiative of the Ministry of the Environment and the Ministry of Land, Infrastructure, Transport and Tourism.