Interim Guidelines On The Carriage Of Biofuel Blends

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Mfame Editor
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The International Maritime Organization (IMO) has issued Interim Guidelines (MEPC.1/Circ.917) to regulate the carriage of biofuel blends in ships. While these guidelines are not mandatory, they provide an important framework for flag Administrations and Recognized Organizations when approving the carriage of biofuels.

The main objective is to ensure safety, environmental compliance, and smooth integration of biofuels into the maritime industry.

Biofuel Blends on Bunker Ships

  • The maximum blend ratio of biofuels and petroleum-derived oils permitted on bunker ships has been increased from 25% to 30% by volume.

  • Such bunker ships must:

    • Be oil tankers certified under MARPOL Annex I.

    • Ensure that residues or tank washings are discharged ashore (unless monitoring equipment is approved for biofuels).

  • Importantly, the International Oil Pollution Prevention (IOPP) Certificate does not require modification if the above conditions are satisfied.

Carriage of Biofuels Beyond 30% on Bunker Ships

  • If bunker ships carry blends with more than 30% biofuels, stricter requirements apply:

    • MARPOL Annex II provisions are enforced.

    • Compliance with Chapter 17 of the IBC Code (International Bulk Chemical Code) is mandatory.

Guidelines for Non-Bunker Ships Carrying Biofuels

  • 25% or less biofuels:

    • Treated as MARPOL Annex I cargoes.

    • Must comply with MARPOL Annex I regulations.

  • More than 25% biofuels:

    • Classified as MARPOL Annex II products.

    • Must follow requirements under Chapter 17 of the IBC Code.

Approved Biofuels Under MARPOL Annex II

The Interim Guidelines specify the following biofuels as approved for carriage:

  • tert-Amyl ethyl ether

  • Ethyl alcohol

  • Fatty Acid Methyl Esters (FAME)

  • Vegetable fatty acid distillates

The Interim Guidelines under MEPC.1/Circ.917 mark a step forward in integrating biofuels into maritime transport, balancing environmental sustainability with regulatory clarity. By clearly defining limits, compliance requirements, and approved fuels, the IMO is ensuring that the shipping industry can safely and efficiently transition to low-carbon alternatives while upholding international safety and pollution standards.

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Source: Lloyd’s Register