Why is ammonia preferred over hydrogen or batteries for large bulk carriers?

Batteries lack the energy density required to power massive cargo ships across oceans, while liquid hydrogen requires extremely low cryogenic temperatures (-253°C) and takes up too much physical space on board. Ammonia has a much higher energy density than hydrogen, is easier to liquefy and store, and can utilize existing global fertilizer transport infrastructure, making it far more practical for long-haul maritime transport.

What are the main safety concerns associated with using ammonia as a marine fuel?

Ammonia is highly toxic to humans and aquatic life even at low concentrations, posing severe risks in the event of a fuel leak or spill on board. To mitigate these hazards, the industry is developing advanced double-walled fuel piping, specialized ventilation systems, and automated emergency shutdown protocols, which must be rigorously certified by maritime classification societies before commercial operations begin.

How does this deal impact the broader transition toward green hydrogen?

Because green ammonia is produced by combining green hydrogen with nitrogen from the air, this massive shipping commitment directly stimulates the upstream green hydrogen economy. Large-scale charter agreements like this provide the long-term demand certainty that developers need to secure financing for multi-gigawatt electrolyzer projects worldwide.

Offshore Energy · June 22, 2026 (Jun 22) · 1 min read

Fortescue, CMB.TECH in zero-emissions shipping deal for 12 ammonia-capable vessels

Analysis

AI-assisted analysis · reviewed by Yuri Kan

Australian green energy pioneer Fortescue has entered into a landmark agreement with Belgian shipping group CMB.TECH to charter a newly built fleet of 12 ammonia-capable bulk carriers. This strategic alliance represents a major commercial bet on ammonia as the frontrunner for decarbonizing the hard-to-abate dry bulk shipping sector. By securing early access to dual-fuel vessels, Fortescue is aligning its massive iron ore logistics chain with its broader corporate ambition to achieve net-zero Scope 3 emissions by 2040.

Key Facts

Fortescue has signed a multi-year charter agreement with CMB.TECH for a fleet of 12 large ammonia-capable container/bulk vessels.
The vessels, each boasting a capacity of 206,000 deadweight tonnes (DWT), are being built by Qingdao Beihai Shipbuilding in China.
The fleet will be equipped with dual-fuel ammonia engines developed by industry leader WinGD, allowing them to run on green ammonia once supply chains mature.
Deliveries of these state-of-the-art Newcastlemax vessels are scheduled to take place between 2026 and 2028.
This deal builds on Fortescue's previous maritime decarbonization milestones, including the successful trial of the 'Fortescue Green Pioneer' vessel in Singapore using ammonia fuel blends.

Background & Context

The global maritime industry is under intense regulatory pressure from the International Maritime Organization (IMO) to reach net-zero greenhouse gas emissions by or around 2050. While liquefied natural gas (LNG) and methanol have served as transitional marine fuels, green ammonia is increasingly viewed as the ultimate zero-carbon solution for long-distance shipping because it emits no carbon dioxide when burned. However, the widespread adoption of ammonia has been hindered by a classic 'chicken-and-egg' dilemma: shipowners are hesitant to build ammonia-fueled vessels without a guaranteed fuel supply, while energy producers are reluctant to invest in green ammonia plants without committed off-takers.

Market Impact

This partnership serves as a powerful market signal that could break the investment deadlock surrounding zero-emission marine fuels. By acting as both the cargo owner and a future green ammonia producer, Fortescue is effectively underwriting the technology risk for shipowners like CMB.TECH. For the wider shipping industry, this deal accelerates the commercialization of dual-fuel ammonia engines and establishes a blueprint for green shipping corridors, particularly on the high-volume iron ore trade routes between Australia and Asia. However, it also places immense pressure on port authorities to rapidly develop safety protocols and bunkering infrastructure capable of handling highly toxic ammonia.

What to Watch

The primary milestones to watch will be the delivery of the first vessels in 2026 and the subsequent sea trials of the WinGD ammonia engines under real-world operating conditions. Additionally, industry analysts will monitor Fortescue's progress in bringing its own green hydrogen and ammonia production projects online to ensure a reliable fuel supply for this new fleet by the late 2020s.

Frequently Asked Questions

Why is ammonia preferred over hydrogen or batteries for large bulk carriers?: Batteries lack the energy density required to power massive cargo ships across oceans, while liquid hydrogen requires extremely low cryogenic temperatures (-253°C) and takes up too much physical space on board. Ammonia has a much higher energy density than hydrogen, is easier to liquefy and store, and can utilize existing global fertilizer transport infrastructure, making it far more practical for long-haul maritime transport.
What are the main safety concerns associated with using ammonia as a marine fuel?: Ammonia is highly toxic to humans and aquatic life even at low concentrations, posing severe risks in the event of a fuel leak or spill on board. To mitigate these hazards, the industry is developing advanced double-walled fuel piping, specialized ventilation systems, and automated emergency shutdown protocols, which must be rigorously certified by maritime classification societies before commercial operations begin.
How does this deal impact the broader transition toward green hydrogen?: Because green ammonia is produced by combining green hydrogen with nitrogen from the air, this massive shipping commitment directly stimulates the upstream green hydrogen economy. Large-scale charter agreements like this provide the long-term demand certainty that developers need to secure financing for multi-gigawatt electrolyzer projects worldwide.

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