Wärtsilä to supply ammonia engine to Skarv

The vessel, to be built at the Huanghai shipyard in China, will be the first newbuild to use this system. The 4-stroke ammonia engine enables a substantial reduction in greenhouse gas emissions and supports Skarv Shipping Solutions’ commitment to deliver sustainable short-sea shipping in Northern Europe. In addition to the engine, Wärtsilä will also supply the complete fuel gas supply system and exhaust after-treatment. The order with Wärtsilä was booked in Q4 2025.

Ammonia has emerged as a promising alternative fuel and will play a significant role in achieving the net-zero-emissions target for 2050. A special report in The Motorship last year highlighted the role ammonia could play in achieving this target which is set by the International Maritime Organization (IMO).

“Our aim is to prove that it is possible to renew the European short-sea fleet while making it more climate-friendly. That means implementing a whole array of technologies. We see ammonia as one of the future fuels and are happy to see strong European companies like Wärtsilä leading the push towards carbon-free propulsion. The Wärtsilä 25 Ammonia solution promises exactly what we are looking for: robust safety and environmental measures combined with advanced energy efficient technology,” said Jan Øivind Svardal, CEO – Skarv Shipping Solutions.

Wärtsilä will supply the complete ammonia solution including the Wärtsilä 25 Ammonia engine, AmmoniaPac Fuel Gas Supply System, the Wärtsilä Ammonia Release Mitigation System (WARMS), and a selective catalytic reduction (SCR) system designed for ammonia. Safety, efficiency and reliability are central to Wärtsilä’s solution design. Total greenhouse gas emissions are reduced by at least 90% when running the engine on sustainable ammonia, compared to equivalent diesel engines. This allows operators to meet current EU emissions targets for 2050, and to also exceed the IMO target for 2040.

“The Wärtsilä 25 Ammonia engine and the whole solution is the result of extensive research and testing over a number of years, in line with our commitment to decarbonising shipping operations,” commented Roger Holm, president of Wärtsilä Marine & executive vice president at Wärtsilä Corporation. “Through our focus on continuous improvement, we have developed the Wärtsilä 25 engine, along with our associated ammonia handling systems, to deliver outstanding levels of safety, efficiency, reliability and sustainability. This solution offers the marine industry a future-ready solution that is available today.”

The Wärtsilä 25 Ammonia engine, which is available as part of the Wärtsilä 25 engine platform, was developed based on the company’s vast safety and operational experience gained from low pressure dual-fuel (DF) engines running on LNG. The equipment delivery for this newbuild is scheduled to begin in Q4 2026.