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FOBAS: MARPOL Annex VI and the use of Marine Biofuels

FOBAS recommends ship operators intending to use biofuels or biofuel blends should obtain confirmation from relevant flag State if they will be following the new UI.

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Lloyd’s Register Fuel Oil Bunkering Analysis and Advisory Service (FOBAS) on Monday (15 August) released a bulletin responding to numerous questions on the approved a Unified Interpretation (UI) in relation to use of biofuels and how to now proceed to use these biofuels:

Many ship operators over the last few years have been looking at the possibility of using one or the other marine biofuel grades being offered, either as a straight replacement fuel or supplied as a blend component with conventional petroleum derived residual or distillate products; typically, at ratios between 20-50%.

However, a major impediment to this biofuel usage in any form has been the requirement under regulation 18.3.2.2 of MARPOL Annex VI that:

‘… fuel oil for combustion purposes derived by methods other than petroleum refining shall not cause an engine to exceed the applicable NOx emission limit set forth in paragraphs 3, 4, 5.11 and 7.4 of regulation 13….’

This has necessitated applications in each instance for an exemption from the flag State to undertake the necessary biofuel trials onboard which of course have had to cover not just the basic functionality of using those fuels but also the determination of NOx emissions in accordance with the relevant provisions of the NOx Technical Code 2008 – a complex and time-consuming task with which FOBAS has been assisting a number of ship operators with trial supporting services. A summary of findings to date was issued earlier this year.

In June MEPC 78 approved a Unified Interpretation (UI) in relation to the use of biofuels – paragraph 13 in the updated consolidated IMO Circular MEPC.1/Circ,795/Rev.6. However, FOBAS has received numerous questions on both this UI itself and how to now proceed where there is the intention to use these biofuels; either as a replacement fuel or as a blend component. To answer these points FOBAS has advised as follows as regards the meaning of this UI:

  • Biofuel blends of 30% by volume or less should simply be considered as conventional petroleum derived fuels
  • For biofuels and biofuel blends of more than 30% by volume, if NOx critical components and settings / operational values are as required by an engine’s Technical File then NOx emission trials should not be required
  • For non-petroleum derived fuels other than biofuels the provisions of regulation 18.3.2.2 continue to apply.

In this it is important to note that this is a UI which Administrations are ‘invited to apply’, the actual text of MARPOL Annex VI has not been amended.

Consequently, FOBAS would recommend that ship operators now intending to use biofuels or biofuel blends should obtain confirmation from the relevant flag State that they will be following the guidance provided by this UI and that NOx emission trials would not be required on the basis that the engines in which that fuel is to be used will be retained in a NOx compliant condition.

Equally, ship operators with existing flag States acceptances as the use of restricted biofuel blends, should obtain confirmation that, if so required, higher ratios of biofuels could now be used without the need for further NOx emission trials.

LR FOBAS support

  • FOBAS is able to continue to offer a full range of NOx emission trial support services covering the planning, risk assessments, performance calculation and reporting as may be required where ship operators still intend to undertake such trials as part of an ‘in-house’ performance assessment.
  • Furthermore, FOBAS offers a comprehensive biofuel quality analysis programme to sufficiently characterise the biofuels ensuring trouble free operations onboard.

Related: IBIA: Boost for biofuels as IMO removes regulatory hurdle

 

Photo credit: Louis Reed from Unsplash
Published: 16 August, 2022

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Biofuel

BHP and GCMD trial multi-feedstock B100 bio bunker fuel on bulk carrier

Bio-blend in the BHP and GCMD pilot is being used on a BHP-chartered bulk carrier “Berge Lyngor”, which was bunkered in Singapore in early May.

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BHP and GCMD trial multi-feedstock B100 bio bunker fuel on bulk carrier

BHP and the Global Centre for Maritime Decarbonisation (GCMD) on Wednesday (3 June) said they have blended biofuels from two distinct feedstocks—used cooking oil and waste animal fats —and introduced the lower-emissions marine fuel into a BHP-chartered bulk carrier as part of a pilot project.

The bio-blend in the BHP and GCMD pilot is being used on a BHP-chartered bulk carrier Berge Lyngor, owned and operated by Berge Bulk, transporting BHP iron ore from Western Australia to China. When run on bio-blend, the vessel has the potential to reduce well-to-wake greenhouse gas emissions by approximately 79 per cent per voyage compared to sailing on very low sulphur fuel oil (VLSFO).

The vessel bunkered in Singapore in early May with a B100 bio-blend comprising 50 percent tallow-derived biodiesel, sourced and supplied by HAMR Energy, and 50 per cent used cooking oil (UCOME) supplied by Mitsui & Co Energy Trading Singapore (METS).

Mitsui also blended the fuel and Dan-Bunkering coordinated and executed the bunkering operation, which was performed by Global Energy’s barge MT Maple.

The BHP and GCMD pilot will assess how biofuels from multiple feedstocks can be blended, handled, and introduced under real-world operating conditions using existing used cooking oil bunkering infrastructure.

At the same time, insights from this pilot will help identify solutions to challenges related to fuel quality, handling, traceability, and onboard vessel performance.

Biofuels for global shipping today rely heavily on used cooking oil – a feedstock whose availability is approaching its projected limits. Biofuel from waste animal fats presents a promising option to expand the supply of lower-emissions marine fuels.

The outcomes of the pilot are expected to shed light on the practical steps to integrate biofuel blends from different feedstocks into existing supply chains. The diversity of biofuels will provide shipowners and operators with greater flexibility to optimise fuel procurement based on cost, availability, and lifecycle emissions performance.

Biofuels derived from different feedstocks can exhibit varying properties that may impact operations, including potential corrosion from oxidation, fuel system clogging caused by wax formation, which this pilot aims to assess.

The pilot will trace and verify the biofuel blend’s integrity aimed at bolstering confidence in emissions reductions reporting. The pilot will also provide insights into how robust tracing can support future marine fuel supply chains where biofuels from multiple feedstocks with varying lifecycle greenhouse gas emissions footprints are blended together.

This project is co-funded by the Maritime and Port Authority of Singapore under the Maritime Innovation and Technology Fund (MINT).

 

Photo credit: Global Centre for Maritime Decarbonisation
Published: 3 June, 2026

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Biofuel

NYK starts one-year B100 bio bunker fuel trial on car carrier

In this trial, NYK will operate a car carrier continuously on B100 for one year to evaluate the impact on engines, fuel supply systems, and operational practices.

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NYK starts one-year B100 bio bunker fuel trial on car carrier

Japanese shipping firm NYK on Tuesday (2 June) said it has commenced a one-year long-term trial involving the continuous use of 100% biofuel (B100) on an NYK-operated car carrier. 

In this trial, NYK will operate a car carrier continuously on B100 for one year to evaluate the impact on engines, fuel supply systems, and operational practices. High-purity biofuels such as B100 are known to be susceptible to degradation from oxygen, light, and heat, raising concerns about the stability of such fuels during long-term use.

In this trial, the biofuel primarily comprises FAME (Fatty Acid Methyl Ester) derived from used cooking oil and similar feedstocks.

The initiative is designed to evaluate the fuel’s effects on the vessel’s equipment and verify operational safety under real-world conditions. 

Through this effort, NYK seeks to accumulate technical expertise that will support the broader use of high-purity biofuels and further accelerate efforts to reduce greenhouse gas (GHG) emissions.

NYK has been advancing the use of biofuels through various initiatives. In 2024, the company conducted a trial using biofuel blend B24 and subsequently expanded practical usage to B30. However, the company said there remains limited global experience with the long-term continuous use of B100.

“By collecting long-term operational data through this trial, NYK aims to accumulate valuable technical insights to support both the safe operation of vessels and the wider adoption of high-purity biofuels,” it said. 

 

Photo credit: NYK
Published: 3 June, 2026

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Ammonia

AM Green plans to build green ammonia plant at Indian port

Initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes, says VOC Port Authority.

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VO Chidambaranar (VOC) Port Authority on Friday (29 May) said it has signed a Memorandum of Understanding (MoU) with India’s ammonia producer AM Green Ammonia to collaborate in the development of a green ammonia production plant.

The plant will have a capacity of one million tonnes per annum (MTPA) at Tuticorin.

The initiative also includes development of green ammonia handling, storage and bunkering infrastructure, pilot bunkering operations, safety procedures and training programmes. 

The project is expected to support the development of green fuel corridors connecting VOC Port with major ports in Europe and Asia, thereby strengthening India’s position in the global green fuels value chain.

VOC Port also signed a Memorandum of Understanding (MoU) with Bureau Veritas (India) Pvt. Ltd., to collaborate on Green Port certification, emissions accounting, ESG reporting, safety validation, development of green bunkering practices, and establishment of a Centre of Excellence for green fuels and sustainability.

The port also plans for an upcoming 750 m³ green methanol bunkering facility.

 

Photo credit: Naveed Ahmed on Unsplash
Published: 3 June, 2026

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