Marine
Everllence B&W ME-LGIA
Join our journey from lab to sea, as we take you through the development process of our two-stroke ammonia engine, our learnings along the way, and the resulting technology.
The journey from lab to sea
The Everllence B&W ME-LGIA is the product of more than 150,000 engineering hours dedicated to solving one of ammonia propulsion’s central challenges: how to reliably combust a slow-burning fuel in a large marine engine.
In July 2023, the first ammonia combustion was successfully achieved on our research engine, with highly stable performance data. Full-scale engine testing began in November 2024 and focused on combustion behavior, emissions, engine tuning, atomizer validation, and control system verification.
These milestones paved the way for the successful Type Approval Test at Research Centre Copenhagen (RCC) in June 2026, confirming that the Everllence B&W ME-LGIA has made the journey from concept development to being ready for on-board installation. The first commercial ammonia-fuelled two-stroke engine from Everllence will come in service in 2026.
Advancing ammonia engine innovation
From fertilizer to marine fuel
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Over
90
%
GHG emissions reduction by the ammonia engine compared with conventional engines
2026
1st engine coming in service
Key benefits of ammonia engines
Ammonia-powered engines offer a compelling combination of efficiency, sustainability, and flexibility – making them a future-proof choice for clean marine propulsion.
High energy efficiency with low emissions
Ammonia can be used as an energy carrier of sustainable hydrogen and is carbon-free. The two-stroke ammonia engine is designed to run with as little as 5% pilot oil at 100% load (L1 rating*), with the remaining 95% of energy coming from ammonia. This results in high power output, excellent engine efficiency, and extremely low emissions - making it a future-proof solution for clean propulsion.
* Performance values indicated refer to energy fraction for L1 rated engines operating at 100% load point in Tier II mode. Actual values may vary depending on engine rating and load conditions.
Carbon- and sulphur-free combustion
Ammonia produces no carbon or sulphur emissions, enabling clean and sustainable combustion. Green ammonia is especially promising as a marine fuel due to its potential for lower production costs compared to other e-fuels such as e-methanol and synthetic natural gas. This positions the ammonia-fuelled engine as a strong candidate for large-scale decarbonization in shipping.
Flexible retrofit options
Ammonia-fuelled engines can be adapted to customer needs – either as newbuilds or as modular, dual-fuel retrofit solutions for existing electronically controlled engines. Whether you operate a modern fleet or look to decarbonize existing vessels, our experts can help you implement the most suitable ammonia engine configuration for your operation.
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Safety and environmental compliance
Our engineering teams are incorporating essential safety features such as ammonia containment systems, sensors, system ventilation and double-walled piping. Combining proven emissions control systems with dedicated safety measures for ammonia-fuelled engines ensures reliable operation and full compliance with global marine regulations.
Engineered safety:
ammonia auxiliary system
The auxiliary systems have been optimized for the Everllence B&W ammonia engine and ensure safe and efficient operation. The injection technology and ammonia catch system make sure that no ammonia above 10 ppm will be vented to the atmosphere. These engineered safety measures are critical for enabling ammonia as engine fuel at scale – while maintaining strict environmental protection standards.
Selective catalytic reduction technology
Ammonia combustion generates approx. 50% less nitrogen oxide than diesel combustion. To reduce NOₓ emissions further and to meet IMO Tier III emission regulations, the ME-LGIA engines will always be equipped with selective catalytic reduction (SCR). This after-treatment process removes NOₓ from the exhaust gas through catalytic reduction, and also eliminates ammonia slip from the exhaust.
The Everllence B&W ammonia engine design philosophy
Ammonia mode
The target of 5% specific pilot oil consumption at 100% load for L1-rated engines has been reached*.
There is potential for further reductions, and this will be investigated for future developments. The initial ME-LGIA engines will have 5% SPOC*.
We aim for the same heat rate as “fuel oil mode”. The ammonia engine concept will be based on the Liquid Gas Injection engine concept, which is well known from the existing methanol and LPG-fuelled Everllence B&W two-stroke dual-fuel engines.
*Performance values indicated refer to energy fraction for L1 rated engines operating at 100% load point in Tier II mode. Actual values may vary depending on engine rating and load conditions.
Fuel oil mode
In fuel oil mode, we target identical performance as a conventionally-fuelled diesel engine.
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