August 2022 

The International Maritime Organization (IMO) has agreed a set of guidelines to support mandatory measures to cut the carbon intensity of all ships. These have been approved by IMO’s Marine Environment Protection Committee (MEPC) and have been adopted on the MEPC 76th session on 10-17 June, 2021.

The amendments to the MARPOL Convention require ships to combine a technical and operational approach to reduce their carbon intensity. This is in line with the ambition of the Initial IMO GHG Strategy, which aims to reduce carbon intensity of international shipping and was agreed in 2018. Two of the targets set in the Initial Strategy were:

  1. reduce CO2 emissions per transport work, as an average across international shipping, by at least 40% by 2030, pursuing efforts towards 70% by 2050, compared to 2008; and
  2. total annual GHG emissions from international shipping should be reduced by at least 50% by 2050, compared to 2008.

The following measures have been introduced:

  1. The Energy Efficiency Design Index (EEDI), applicable for New* and Existing ship that has undergone a major conversion which is so extensive that the ship is regarded by the Administration as a newly constructed ship Ships, must be calculated according to 2018 guidelines on method for EEDI calculations for new ships MEPC.308(73). The attained EEDI shall be specific to each ship and shall indicate the estimated performance of the ship in terms of energy efficiency, and be accompanied by the EEDI technical file that contains the information necessary for the calculation of the attained EEDI and that shows the process of calculation. The attained EEDI shall be verified, based on the EEDI technical file, either by the Administration or by any organization duly authorized by it.

The above approach aims to address both technical (how the ship is equipped and retrofitted) and operational measures (how the ship operates).

The amendments require IMO to review the effectiveness of the implementation of the CII and EEXI requirements, by 1 January 2026 at the latest, and, if necessary, develop and adopt further amendments. IMO’s Initial GHG Strategy is to be revised by 2023.

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