The new four-stroke engine for ammonia enables a significant advance in sustainable shipping (Source: Wärtsilä Corporation)

Wärtsilä unveils first four-stroke ammonia engine

Wärtsilä has released details of the world’s first four-stroke ammonia-fuelled marine engine. Available as part of the Wärtsilä 25 engine platform launched in September 2022, the engine has already attracted the attention of its first buyer.

Earlier this month, the technology group signed a letter of intent with Viridis Bulk Carriers, which is thought to be the world’s first zero-emission shipping company. A joint venture between Amon Maritime, Mosvolds Rederi, and Navigare Logistcs, Norway’s Viridis expects to sign a contract for the new ammonia-fuelled engine early in 2024. It plans a series of new vessels that will provide carbon-free shipping to customers in Europe’s short-sea bulk market.

In addition to the engine, Wärtsilä will also supply an AmmoniaPac fuel gas supply system, its Wärtsilä Ammonia Release Mitigation System (WARMS), and the Wärtsilä NOx Reducer to treat exhaust gas.

The company will also provide an automation system and a maintenance agreement. Training in the adoption and use of ammonia as a fuel will be available for crew members, as well as 24/7 global support, the company said.

Viridis Bulk Carriers’ Board member, André Risholm, said: “The maritime industry must significantly reduce its emissions if we are to succeed in reaching the goals set in the Paris Agreement. The adoption of new technologies and ammonia as a carbon-free fuel is central to this. We are delighted to partner with Wärtsilä on another important milestone for our ammonia-powered short-sea bulk vessels.”

Håkan Agnevall, Wärtsilä President and CEO, commented: “Wärtsilä is a leader in shaping the decarbonisation of the marine and energy industries. This industry-leading solution is yet another flagship moment in Wärtsilä’s extensive programme to ensure future marine fuels are both viable and safe. Working in partnership with Viridis Bulk Carriers, we take the next step in our decarbonisation journey, enabling the transition to greener fuels and accelerating towards net-zero emissions shipping.”

Article Editorial staff Ship&Offshore
Article Editorial staff Ship&Offshore