Siddharth Mahajan


Wan Jing Tan


Image source: Bureau Veritas Pathways to attaining EEXI


Like EEDI, EEXI is a non-prescriptive, performance-based mechanism leaving it to the owners, managers, and operators to decide which methodology to use to comply with the regulations. From the above formula, it is apparent that EEXI is a function of the


(a) installed engine power in the numerator, which is one of the most important parameters to determine EEXI; and in the denominator (b) vessel’s speed, and (c) deadweight.


Owners can choose to influence the numerator and/or the denominator to attain the required EEXI. Broadly speaking, the available energy efficiency measures fall into one of the following three categories:


78 | The Report • June 2022 • Issue 100


power limitation (EPL), Shaft Power Limitation (SHaPoLi) and engine derating to reduce the output power of the engine and consequently the vessel’s operating speed.


Installing energy saving devices or energy efficiency technologies to reduce hull resistance or improve propeller thrust, such as low friction coating, hull air lubrication system, wind assisted propulsion, waste heat recovery system and other innovative energy efficiency technologies (ref. IMO circular MEPC.1/Circ.896).


Engine modification for lower or zero carbon fuels, such as LNG and ammonia.


Power optimisation, such as engine


Compliance with the EEXI may require changes to the design of the vessel and/or machinery onboard. When deciding which countermeasures to adopt to meet the EEXI regulations owners would need to consider many different factors such as:


Time required for installation; Costs involved; Payback time for the improvements installed;


Age of the vessel and expected remaining trading life; Speed loss;


Marketability of the vessel; And owners would need to ensure that any modifications carried out on the vessel will satisfy Charterers’ and terminals’ vetting policies.


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