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Operational Issues Complicate CO2 Formulas

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The IMO Energy Efficiency Operational Indicator (EEOI) has been examined using data from the Belgian Shipowners Association fleet with the study highlighting that market factors influence ship operations in a way that cascades into changes in the EEOI over time.

The University College of London (UCL) Energy Institute was commissioned by the Royal Belgian Shipowners Association (RBSA) to provide insights into CO2 emissions in preparation for the European Commission’s proposal to require ships exceeding 5,000 gross tons to monitor and report their operational energy efficiency starting in 2018 on all voyages to, from, and between E.U. ports. 

The EEOI was developed by the IMO in order to allow ships to monitor the carbon emissions of their shipping activities. The EEOI is the total carbon emissions in a given time period per unit of revenue ton-miles. 

Variations in the index are mainly caused by three factors: the technical efficiency of the ship, the amount of cargo transported per unit of time and variations in speed. However, as the EEOI is an aggregate number, it is difficult to identify the influence of these factors.

The study found significant differences in the laden EEOI (fuel consumption in ballast voyages and port excluded) when a ship was operated on the spot market compared to time charter, resulting in a higher laden EEOI for ships on time charter. [...]

The Maritime Executive

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> UCL Energy Institute RBSA study on EEOI and challenges in implementing MRV Back to all Industry News
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