The Global Centre for Maritime Decarbonisation has published a practical report setting out how shipowners can verify they receive the total quantity of fuel and the renewable content they contract for, sources indicated on 27 August 2026.
The document, titled Quantity assurance in marine biofuel supply chains, presents a pragmatic approach to quantity assurance that draws on evidence from GCMD’s end-to-end marine biofuel supply chain trials. The centre frames the work as directly applicable to the needs of commercial fleets purchasing biofuels.
Quantity assurance, in the context used by the report, covers two complementary concerns: confirming the total volume of fuel delivered to a vessel and confirming the proportion of that volume that meets the buyer’s renewable-content specification. The report is intended to help ensure those two elements can be verified in routine commercial operations.
Verification of both total quantity and renewable content has become an operational priority as more shipowners contract for alternative fuels that carry both climate and commercial value. Accurate measurement and demonstrable renewable content underpin contractual certainty and the integrity of emissions and sustainability claims.
Practical procedures rather than theoretical frameworks
GCMD emphasises a practical, operational focus. The report sets out steps and measures intended to be workable within existing commercial and operational constraints faced by ship operators and fuel suppliers.
By drawing on evidence from end-to-end supply chain trials, the centre aims to align proposed measures with what can be achieved across the fuel chain, from bunker delivery through sampling and documentation to fuel receipt on board the vessel.
Evidence from trials
The report’s approach is explicitly evidence based, informed by the centre’s trials of marine biofuel supply chains. Those trials provided the empirical foundation for the recommended procedures and methods set out in the report.
GCMD presents the findings as applicable to routine contracting and delivery practices, indicating that the measures were tested across the stages that typically give rise to quantity and content uncertainty.
The report is likely to be of direct interest to owners and managers engaged in early adoption of renewable marine fuels. It provides a structured route to verifying contractual obligations without asserting novel technical breakthroughs.
The publication of Quantity assurance in marine biofuel supply chains adds to a growing body of practical guidance aimed at making lower-emission fuels operationally accessible and contractually dependable. The GCMD report, as reported, contributes a focused response to the specific problem of verifying what has been paid for in both litres and renewable content.
Further dissemination and uptake of the recommended practices will determine how rapidly they become standard in commercial bunkering and biofuel procurement. For now, the report supplies a tested, practical template for shipowners seeking greater certainty around fuel quantity and the renewable attributes they purchase.