Shipping’s interest in ammonia is moving rapidly from decarbonisation strategy to practical safety regulation, with the International Maritime Organization using a dedicated 17 September technical seminar to examine how the fuel can actually be produced, bunkered, carried and used safely aboard ships.
The shift matters because ammonia presents a different operational risk profile from conventional marine fuels. Its potential as a low- or zero-carbon energy carrier has attracted substantial industry investment, but toxicity, handling, spill response and onboard system design create safety questions that cannot be answered by emissions performance alone.
IMO puts ammonia operations under the microscope
The IMO Technical Seminar on the use of ammonia as marine fuel, organised by the Future Fuels and Technology Project, takes place at IMO headquarters in London on 17 September alongside the twelfth session of the Sub-Committee on Carriage of Cargoes and Containers (CCC 12).
The programme covers ammonia production pathways and supply, bunkering, onboard applications, engine technologies, spill response, safety considerations and management of ammonia effluents. That breadth is revealing: the regulatory problem is not simply whether an engine can burn ammonia, but whether the complete fuel chain can be managed safely.
Alternative fuels are now a core safety agenda
CCC 12 is meeting from 14 to 18 September. In his opening remarks, IMO Secretary-General Arsenio Dominguez highlighted the development of technical provisions for ships using new technologies and alternative fuels as a major item.
The sub-committee is expected to finalise revisions to interim safety guidelines for ships using methyl or ethyl alcohol as fuel, further develop draft guidelines for low-flashpoint oil fuels and begin considering interim guidelines for onboard carbon capture and storage systems. Ammonia sits within that broader transition toward a fleet using technologies for which the traditional fuel-safety framework was not designed.
For shipowners, this means decarbonisation and safety compliance can no longer be managed in separate silos. A fuel choice affects ship design, crew competency, bunkering arrangements, emergency response, port interfaces, insurance and contractual allocation of risk.
Toxicity changes the operational equation
Ammonia’s attraction as a marine fuel does not eliminate its hazards. Exposure can be dangerous to people, making containment, detection, ventilation, protective equipment and emergency procedures central to safe operation.
That creates design questions around the location and segregation of fuel systems, access to machinery spaces, gas detection and the management of releases. It also creates human-factor questions. Crew members need to recognise hazards, understand alarms and know how to respond without turning an equipment failure into an exposure event.
The practical compliance burden therefore extends well beyond obtaining a new fuel-capable engine. Owners considering ammonia need a system-level assessment covering the ship, shore interface and people operating both.
Bunkering will be a critical interface
Bunkering is one of the most commercially important parts of the emerging ammonia ecosystem. A ship may have compliant onboard technology but still depend on ports, terminals, bunker suppliers and transfer procedures capable of managing the fuel safely.
Responsibility at the interface needs to be clear. Procedures must address connection and disconnection, communications, emergency shutdown, exclusion zones, leak detection and response. Port rules may differ, and availability of trained personnel and specialised infrastructure may affect where ammonia-fuelled ships can operate efficiently.
Contractual arrangements will need to evolve as well. Bunker supply terms traditionally focus heavily on quantity, quality, payment and delivery. Alternative fuels add questions about specifications, compatibility, handling standards, safety information and responsibility for losses or contamination arising during transfer.
Spill response looks different
Conventional oil-spill preparedness is not a complete model for ammonia. Response planning needs to reflect the substance’s behaviour and the potential risk to personnel and surrounding areas. The IMO seminar’s express inclusion of spill response and effluent management shows that regulators and industry are looking beyond propulsion to the consequences of accidental release.
Emergency plans will need to connect shipboard action with port and coastal response capabilities. A technically sound plan that assumes unavailable shore resources may provide false comfort. Operators should understand what emergency assistance is realistically available at the ports where ammonia bunkering or operations are contemplated.
Training and competence may become a bottleneck
New fuels change the skills required at sea. Familiarity with conventional bunker fuel does not automatically translate into competence with toxic alternative fuels. Training programmes, drills and competency standards therefore need to keep pace with technology deployment.
This has workforce and commercial implications. Early adopters may compete for experienced personnel, while owners need to ensure that training is specific enough to the equipment actually installed. Managers should also consider how contractors and shore personnel are incorporated into the safety system.
A developing framework means contracts need flexibility
Because international standards are still developing, long-lived assets face regulatory uncertainty. A vessel ordered today may operate for decades while technical requirements continue to evolve. Newbuilding contracts, conversion agreements and long-term charters should therefore consider how future mandatory changes are allocated.
Questions can arise over who pays for modifications, whether a vessel remains contractually compliant after rules change, and what happens if fuel infrastructure develops more slowly than expected. These are not reasons to reject ammonia; they are reasons to treat regulatory evolution as a commercial risk requiring deliberate allocation.
MLB has been following the broader CCC 12 alternative-fuel safety agenda. The ammonia seminar adds operational depth to that discussion by connecting future rules with the practical realities of fuel supply and ship operation.
The next phase is about safe deployment
Shipping’s energy transition will not be judged only by which fuels reduce greenhouse-gas emissions. It will also be judged by whether those fuels can be handled without introducing unacceptable risks to crews, ports and the marine environment.
For ammonia, the technical conversation is now becoming operational. Owners evaluating the fuel should be asking not only whether the technology works, but whether the complete safety, training, infrastructure, insurance and contractual ecosystem around it is ready.
This article is for general informational purposes only and does not constitute legal advice. It was prepared solely from publicly available sources.