Alternative Fuels

Joint study examines ecological impact of ammonia bunker fuel spills during bunkering and collisions

EDF, LR and Ricardo research found that estuaries, mangroves and wetlands are particularly sensitive to potential ammonia fuel spills compared to the polar regions and the deep sea.

Published

2 years ago

November 22, 2022

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A joint study released by Environmental Defense Fund (EDF), Lloyd’s Register (LR) and Ricardo PLC, examines the potential marine environmental impacts of ammonia spills during its use as a shipping fuel, according to LR on Monday (21 November).

The study, which used extensive modelling due to the scarcity of real-world data, focuses specifically on the impacts of large ammonia bunker fuel spill scenarios on marine habitats.

Potential effects on aquatic environments and associated ecological receptors were assessed in scenarios if a spill were to occur during bunkering, or in the case of a ship’s collision and sinking. In addition, possible mitigation measures and specific spill management practices for these scenarios were modelled and studied.

“The shipping industry must make a rapid energy transition to address the climate emergency. But it is also clear that we must proceed with caution. We owe it to future generations to ensure we are championing true climate solutions that will not negatively impact our rivers, our oceans or our health,” said Marie Hubatova, Director of Global Shipping for EDF's Global Transport team.

The study examined potential ammonia fuel spills during bunkering and collision scenarios, under a variety of conditions, including time of day, temperature, humidity and solar radiation. The outputs were tested across eight habitats (rivers, estuaries, wetlands, coastal waters, coral reefs, mangroves, polar regions and the deep sea) using multiple ecological receptors (bacteria, plankton, macrophytes, invertebrates, fish, birds, reptiles, and marine mammals).

The study found that estuaries, mangroves and wetlands are particularly sensitive to potential ammonia fuel spills compared to the polar regions and the deep sea. Within these habitats, it is typically fish which are most sensitive to an ammonia spill, with birds and mammals to a lesser degree.

Lauren Dawson, Senior Consultant, Water and Environment Practice, Ricardo, said: “Examining the impact of ammonia is a challenge because of the vast conditions a ship might face while at sea or even when bunkered. Critical factors to consider include the various ship and storage types, the underlying principles which determine the fate of ammonia in the environment, and the diversity of aquatic habitats and species that could be affected.”

“Ultimately, what we found is that ammonia is more threatening to fish species, and particularly to ecosystems with less saline water and higher temperatures. It is therefore important to study the impact of ammonia carefully for particular regions where these habitats intersect with major shipping channels and ports, such as the Strait of Malacca. The findings of the report provide an excellent step forward to delivering a baseline upon which future assessments can be refined.”

The results were then compared to previously studied habitat and species sensitivity to conventional oil-based fuels. Overall, an ammonia spill has a relatively smaller dispersion distance and lower persistence within the environment when compared to heavy fuel oil (HFO) and marine gas oil (MGO).

Existing reports show that oil-based fuels have higher impacts on invertebrates and birds, compared with ammonia. Ammonia has a medium impact on all other ecological receptors, except bacteria, whereas oil-based fuels have medium impacts on plankton, fish, macrophytes, reptiles and marine mammals (see the Table summarising the environmental impact level in page 5 of our summary report).

While the maritime industry has prior experience with ammonia transported in gas carriers and used as refrigerant, the introduction of ammonia as a shipping fuel creates new challenges related to safe bunkering, storage, supply and consumption for different ship types. The potential toxicity of ammonia cannot be ignored; without mitigation measures and solid spill management practices, an ammonia fuel spill could have negative impacts on aquatic environments. Therefore, a robust regulatory framework must be developed for ammonia to be a viable, low carbon alternative for shipping.

“There are many questions around the use of ammonia as a shipping fuel. Studies like this support the industry’s understanding of the environmental impacts as well as the operational and safety challenges. Greater clarity about the risks posed to marine ecosystems will allow industry stakeholders to make better informed decisions on the multiple transition pathways under consideration,” said Andy Franks, Senior Risk Specialist, LR Maritime Decarbonisation Hub.

Note: The full article can be found here while the full report Ammonia at sea: studying the potential impact of ammonia as a shipping fuel on marine ecosystems can be downloaded here.

Photo credit: Lloyd’s Register
Published: 22 November, 2022

Biofuel

Hercules Tanker Management vessel “Mount Kibo” takes on B30 bio bunker fuel

HTM said its tanker was successfully supplied with B30 bunkers by tanker “Hercules Sky”, another HTM-owned vessel and operated by Peninsula, marking the first biofuel supply to the HTM fleet.

Published

2 hours ago

April 30, 2025

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Hercules Tanker Management vessel “Mount Kibo” takes on B30 bio bunker fuel

Hercules Tanker Management (HTM) on Tuesday (29 April) announced that its tanker Mount Kibo has been successfully supplied with B30 bunkers by tanker Hercules Sky, another HTM-owned vessel which is operated by Peninsula.

The operation marked the first biofuel supply to the HTM fleet.

HTM is the shipping venture launched last September by John A. Bassadone, founder and CEO of independent marine fuel supplier Peninsula.

HTM said the operation carried out in the Strait of Gibraltar aligns with the recent discussions at MEPC 83, where key decisions were made to advance maritime decarbonisation, including new fuel standards and a global pricing mechanism for emissions.

“Additionally, this initiative supports the objectives of the FuelEU Maritime Regulation, which promotes the use of renewable, low-carbon fuels and clean energy technologies for ships,” it said.

“By utilising biofuels, we are contributing to the reduction of greenhouse gas emissions and supporting the industry's transition towards cleaner energy solutions.”

Photo credit: Hercules Tanker Management
Published: 30 April, 2025

Alternative Fuels

DNV: Seven steps to obtain approval for ammonia- and hydrogen-fuelled ships

DNV summarizes how shipowners can apply a practical, structured approach to gaining approval for ammonia- or hydrogen-fuelled ships as both are gradually emerging as suitable bunker fuels.

Published

2 hours ago

April 30, 2025

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Classification society DNV on Monday (28 April) released an article summarizing how shipowners can apply a practical, structured approach to gaining approval for ammonia- or hydrogen-fuelled ships.

From engaging early with flag administrations to addressing design risks, training crews, and managing bunkering safely, DNV described seven essential steps to receive approval:

The paper – Safe introduction of alternative fuels: Focus on ammonia and hydrogen as ship fuels – offers a structured pathway for shipowners to achieve approval through IMO’s alternative design approval (ADA) process.

Seven steps to obtain approval for ammonia- and hydrogen-fuelled ships

“We outline seven steps to assist shipowners and other stakeholders in obtaining approval and safely deploying ammonia- and hydrogen-fuelled ships in today’s immature regulatory environment,” says Linda Hammer, Principal Consultant, Environment Advisory at DNV and lead author of the white paper. “The regulatory path is certainly complex, but the steps and safety measures in the paper add up to a clear, achievable pathway to ship approval and safe operations. It also explains how DNV’s support can significantly ease this process through its tailored rule sets and learnings from pilot projects.”

t1 ind 586 steps to obtain approval (1)

Understanding ADA phases: From initial design to final approval

IMO’s IGF Code (International Code of Safety for Ship Using Gases or Other Low-flashpoint Fuels) currently covers natural gas but not ammonia or hydrogen. Without detailed regulations, IMO’s risk-based ADA process (MSC.1/Circ.1455) is used. It involves demonstrating that the ship’s safety level is equivalent to that of conventional oil-fuelled vessels.

t4 ind 586 milestones in the two phases (1)

ADA has two main phases. A preliminary design approval requires a hazard identification (HAZID) study, developing a preliminary risk assessment, and defining preliminary risk-control measures and safety strategies.

Phase two, final design approval, starts with refining the design with detailed technical and safety documentation, then making a final risk assessment, addressing integration and operation-specific concerns. Then come complete system integration testing and submitting findings to the flag administration.

Role of class and flag administrations in approval process

As the IMO regulatory framework progresses towards eventually amending the IGF Code, classification societies like DNV can give shipowners a head start in designing vessels by issuing class certificates and providing prescriptive rule frameworks to support ADA.

t2 ind 586 the status of the development of imo safety regulations

Flag administrations enforce statutory regulations and have the final say on approvals. Early and active engagement with the relevant flag administration is therefore the key to clarifying approval expectations and streamlining ADA.

Subject to flag administration acceptance, the DNV rules can be applied as the flag administration’s approval basis or to significantly reduce the complexity of ADA.

Simplifying ship approval: DNV’s rules for ammonia and hydrogen fuels

DNV’s classification rules for ammonia and hydrogen (i.e. the “Gas fuelled ammonia” notation published in 2021 and the 2024 “Gas fuelled hydrogen” notation) provide structured, prescriptive requirements as far as possible to simplify ADA. Applying them helps reduce uncertainty in flag administration approval, streamlines design focus by aligning with expected risk assessments, and provides predictability to shipowners, ship designers and shipyards.

The paper describes step-by-step actions for obtaining approval. First, engage DNV and the flag administration early to clarify the approval basis. “DNV can help owners and yards in the initial contact with the flag administration to obtain necessary clarification regarding the approval scope and process,” says Hammer.

Second, align the design with DNV rules to ensure it provides a strong technical basis for risk evaluation. Third, tap into DNV’s extensive and growing experience from prior projects to anticipate what risk studies and documentation may be needed.

The paper also discusses measures to manage the new technical, human and organizational risks that both fuels bring compared to conventional fuels. DNV’s dedicated ship rules for each fuel type outline technical requirements and mitigation systems to integrate during design and operation.

Note: DNV’s full article on ‘Practical guide for approval of ammonia- or hydrogen-fuelled ships’ can be read here.

Photo credit: DNV
Published: 30 April, 2025

Methanol

Ofiniti to roll out e-BDNs for Golden Island methanol bunkering operations in Singapore

Ofiniti will issue electronic Bunker Delivery Notes, based on the recently published Technical Reference 129 on Methanol Bunkering, across Golden Island’s newbuilds and part of its existing fleet.

Published

24 hours ago

April 29, 2025

Admin

Ofiniti to roll out e-BDNs for Golden Island methanol bunkering operations in Singapore

Ofiniti, a provider of digital solutions for maritime bunker operations, on Tuesday (29 April) said Singapore bunker supplier Golden Island Pte Ltd will adopt Ofiniti platforms for its expanding fleet operations.

Ofiniti said the move will lay the foundation for a digital multi-fuel future with Golden Island’s four new chemical tankers on order and Singapore-flagged bunker tanker Golden Antares, which will soon enter service.

As part of the transition, Ofiniti will roll out electronic Bunker Delivery Notes (e-BDNs), based on the recently published Technical Reference (TR) 129 on Methanol Bunkering, across Golden Island’s newbuilds and part of its existing fleet.

The Maritime and Port Authority of Singapore (MPA) and Enterprise Singapore (EnterpriseSG), through the Singapore Standards Council (SSC), on 10 March published TR 129 to provide a comprehensive framework for the safe and efficient use of methanol as an alternative fuel for bunkering operations.

Kenny Yap Song Jin, Low Carbon Solutions, Golden Island, said: “Launching our methanol bunkering operations is a major milestone, not just for Golden Island, but for Singapore’s journey toward multi-fuel readiness.

“By combining innovative low-carbon fuels with digital transparency, we set a new benchmark for safe, efficient, and sustainable marine fuel delivery.”

Ofiniti said it has supported suppliers through every stage of the industry’s transition, from conventional fuels to LNG, biofuels, hydrogen, and now, supporting methanol.

Tue Nielsen, Chief Executive Officer, Ofiniti, said: “I’m proud to welcome Golden Island to Ofiniti’s platforms.

“Their move signals a strong trust in our ability to support next-generation operations, and it reflects a broader shift in the market towards digital solutions built specifically for the realities of maritime fuels today and tomorrow.

“We are customer-obsessed, always trying to build in resilience to the way we are doing business.”

Manifold Times previously reported Golden Island’s plans to start bunkering trials of green methanol with its newbuild Singapore-flagged 7,999 dwt IMO type 2 bunker tanker from July.

Golden Antares was scheduled to depart a Chinese shipyard by late April and will lift green methanol produced by Hong Kong and China Gas Company Limited (Towngas) before returning to Singapore to begin bunkering trials.

In April, Ofiniti welcomed bunkering and marine fuel solutions provider Global Fuel Supply (GFS) to its FuelBoss platform as one of its newest customers.

GFS said it was proud to be the first physical supplier in West Africa to launch fully digitalised bunker operations with electronic bunker delivery note (e-BDN) via the FuelBoss platform.