The Marine Environment Protection Committee (MEPC) adopted amendments to the International Convention for the Prevention of Pollution from Ships (MARPOL) Annex VI that require ships to reduce their greenhouse gas emissions. These amendments combine technical and operational approaches to improve the energy efficiency of ships, in line with the targets established in the 2018 Initial IMO Strategy for Reducing GHG Emissions from Ships and also provide important building blocks for future GHG reduction measures.

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The attained Energy Efficiency Existing Ship Index (EEXI) is required to be calculated for ships of 400 GT and above, in accordance with the different values set for ship types and size categories. 

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The attained EEXI is a measure of ship's energy efficiency (g/t*nm) and shall be equal to or less than the allowable maximum value of the required EEXI. Furthermore, if attained EEXI cannot satisfy the required EEXI, the ship should implement any countermeasures.

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A verification of the attained EEXI is required. Also, the technical file containing the necessary information for the calculation of the attained EEXI and other relevant background documents should be submitted to Class.