Meet the world’s first tri-fuel giants transforming iron ore transport

Mitsui O.S.K. Lines and Vale International have finalized a 25-year charter agreement for two massive bulk carriers capable of operating on three distinct marine fuels. These 210,000-metric-ton vessels are scheduled for delivery in 2030 and will primarily transport Brazilian iron ore to global destinations, with China identified as a key market.

Ethanol cuts lifecycle emissions by 90%

The ships’ propulsion systems allow switching between conventional heavy fuel oil, methanol, and ethanol. This tri-fuel capability provides operators with flexibility to manage varying fuel availability across long-distance routes where port infrastructure differs significantly.

According to MOL estimates, using ethanol can reduce lifecycle carbon emissions by up to 90 per cent compared to heavy fuel oil. This calculation encompasses emissions from the fuel’s production through its eventual consumption onboard. Ethanol has also drawn attention because its handling requirements may facilitate broader adoption in marine applications.

Methanol serves as another alternative, while heavy fuel oil remains an option when lower-carbon fuels are unavailable or economically unviable. Such adaptability is critical for vessels traversing multiple continents, where consistent access to specific alternative fuels cannot be guaranteed at every stop.

LNG and ammonia-ready design features

Beyond the immediate tri-fuel capacity, the vessels incorporate an LNG- and ammonia-ready design. This structural provision allows potential accommodation of additional fuel pathways as technology and supporting infrastructure evolve over time.

Energy-saving technologies will complement the alternative-fuel systems, helping to lower overall energy demand regardless of the specific power source used. Each carrier measures nearly 300 meters in length and 50 meters in width, dimensions reflecting the scale necessary for efficient oceanic movement of bulk commodities.

The 25-year operational term gives these designs a long runway to adapt to shifting fuel markets. Since ships typically remain in service for decades, a propulsion system restricted to a single fuel type could become limiting if cleaner alternatives gain wider acceptance later.

Vale targets maritime emission reductions

Vale intends to utilize these vessels as part of its broader strategy to decrease emissions from maritime transportation. The company’s Scope 3 emissions include those generated by shipping activities, making this fleet renewal a component of its decarbonization efforts.

The project highlights the shipping industry’s search for practical methods to cut emissions amid rapidly developing but unevenly available alternative fuels. Economic conditions and supply chain logistics continue to vary widely between ports, necessitating flexible engineering solutions like the ones implemented in these new carriers.