Two Ammonia-Fueled Ammonia Carriers to Sport Wärtsilä Systems in 2027

Why It Matters

The deal showcases the commercial scaling of ammonia‑powered ships, a key step toward maritime decarbonisation and strengthens Wärtsilä’s leadership in low‑carbon marine technology.

Key Takeaways

• Wärtsilä supplies cargo‑handling and fuel‑gas systems for two ammonia carriers.
• Vessels built at Nantong CIMC Sinopacific, 51,350 m³ capacity each.
• Dual‑fuel engines can run on ammonia or LPG, aiding decarbonisation.
• Each ship priced at US $84 million; deliveries slated for 2028.
• Joint venture between Navigator Gas and Amon Maritime targets five‑year charters.

Pulse Analysis

Ammonia is emerging as a viable zero‑carbon alternative to traditional marine fuels, driven by IMO’s 2050 greenhouse‑gas reduction targets and growing investor pressure for greener logistics. Unlike hydrogen, liquid ammonia can be stored at near‑ambient temperatures, simplifying bunkering infrastructure and enabling longer voyages. However, challenges remain around catalyst durability, NOx emissions, and crew training. The two new carriers illustrate how shipbuilders and fuel suppliers are tackling these hurdles by pairing ammonia with proven LPG systems, offering operators flexibility during the transition period.

Wärtsilä’s involvement underscores its strategic push into the decarbonisation niche. The company’s cargo‑handling and fuel‑gas supply solutions are already standard on many LPG and LNG vessels, and the dual‑fuel architecture for ammonia expands that footprint. By delivering equipment in Q3 2027, Wärtsilä positions itself ahead of the anticipated wave of ammonia‑fuel orders, leveraging its experience in two‑stroke and four‑stroke engine integration. The order also validates the firm’s claim of market leadership, signaling confidence from ship owners that its technology can meet safety, efficiency, and regulatory demands.

For the broader market, the Navigator Gas and Amon Maritime joint venture signals growing commercial confidence in ammonia as a mainstream marine fuel. The vessels, priced at roughly US $84 million each, will operate under long‑term charters with a blue‑chip client, providing a stable revenue base that can de‑risk future ammonia projects. As more ports develop ammonia bunkering capabilities, the dual‑fuel design offers a pragmatic bridge, allowing operators to switch between LPG and ammonia depending on availability and cost. This flexibility could accelerate fleet renewal cycles and set a template for other mid‑size carriers seeking to meet tightening emissions standards.