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Energy Efficiency Existing Ship Index (EEXI)

The Energy Efficiency Existing Ship Index (EEXI) is part of the technical approach taken by IMO to improve the operational energy efficiency of existing ships. EEXI is the extension of EEDI for existing ships that were built before 2013, and will be implemented using similar guidelines. EEXI is a design index of a vessel that considers only the design and not operational factors.

Overview of MARPOL Amendments

The International maritime organization has adopted amendments to Annex VI of the MARPOL convention during the 76th session of the Marine Environment Protection Committee (MEPC 76) organized in June 2021.

These amendments are in line with the IMO GHG strategy of reducing the carbon intensity of shipping by 40% by 2030 compared to 2008 levels and require ships to incorporate a technical and operational approach to reduce carbon intensity.


EEXI is a new mandatory requirement applying to ships which fall under the existing survey and certification scheme as per MARPOL Annex VI regulation 19, similar to EEDI.
  • It shall apply to all ships of 400 GRT and above.
  • It shall not apply to ships operating only in Flag’s national water.
  • And shall not apply to ships with non-conventional propulsion with the exception of a Cruise passenger ship with electric propulsion and LNG carriers.
Draft Guidelines for EEXI

1. Guidance on Method of calculation of the attained EEXI.

Attained EEXI is the measure of Ships’ energy efficiency and is measured in gm CO2/ t.nm. EEXI uses the same formula as for attained EEDI according to resolution MEPC.308(73), amended by resolution MEPC.322(74). The ships falling under the scope of the EEDI requirement can use attained EEDI instead of EEXI If the attained EEDI value satisfies the EEXI requirement.

2. Guidance on the survey and certification of the energy efficiency existing ship index (EEXI).

An administration or organization duly authorized by it will conduct the survey and certification of EEXI. An EEXI technical file is to be prepared by the ship containing necessary information as adopted during MEPC 76 except for EEDI compliant ships where attained EEDI is less than the required EEXI. In case attained EEXI complies with the required EEXI, a new IEE Certificate will be issued indicating attained and required EEDI.

3. Guidance on Shaft / Engine power limitation system to comply with the EEXI requirements and use of power reserves.

For non-compliant ships, further guidance has been provided on how to implement Energy efficiency Techniques including incorporating Engine Power Limitation or Shaft Power Limitation to improve the EEXI. Ships are required to prepare a Management Plan for SHaPoLi / EPL, which should be verified by the administration or a RO.

Difference between EEDI and draft guidance for EEXI.
  • For vessels with attained EEDI value satisfying the current regulation, no need of preparing an EEXI technical file as there is an EEDI technical file already in place.
  • For vessels that do not have EEDI value, an EEXI technical file is to be prepared in the same manner as EEDI.
When will EEXI come into force?

The EEXI was approved at MEPC 75 in November 2020 and has been formally adopted at the MEPC 76 session held in June 2021. Associated requirements will come into force on 1st January 2023.

What can Verifavia Shipping do for Ship operators?

Verifavia Shipping is the world’s leading Independent verifier for carbon emissions in shipping and aviation, we have the expertise to verify the EEXI and EEXI technical files for shipping operators.

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