EEXI
The Energy Efficiency eXisting ship Index (EEXI) is a one-time certification targeting design parameters for existing vessels.
Applicable to the following classes above 400 GT: bulk carrier, gas carrier, tanker, containership, cargo vessels, Ro-ro, LNG carrier, cruise vessel.
Ships have to approve the attained EEXI value by the first periodical survey in 2023.
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FAQs
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Item description
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Verification of the attained EEXI includes verification of the EEXI technical file, and possibly verification of the Onboard Management Manual (OMM) and the shaft/engine power limitation. Therefore this can only be carried out by the RO that Classes the ship for Hull and Machinery. See also Resolution MEPC.351(78).
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Since the RO's are already authorised to conduct the surveys and to issue the certificates as regulated in MARPOL Annex VI, and the new requirements regarding EEXI and CII are amendments to MARPOL Annex VI, no separate authorisation is required. The Appendix to Annex 1 to the Agreement between the NL and RO dated 03 April 2014 already provides for this (link).
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During the first IAPP survey after 1-1-2023, as per MARPOL Annex VI, regulation 5.4.7. De-harmonisation of the IAPP is not encouraged.
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No, fishing ships are an exempted ship type.
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For ships which are falling into more than one categories of ships, as per MARPOL Annex VI, regulation 23(.1), the most stringent attained EEXI, as calculated for the categories the ship falls into, shall be used.
Ship types compliant to EEXI
Ship categories which are in the scope of EEXI, based on MARPOL Annex VI, regulation 23(.1), are:
Ship types not compliant to EEXI
Ship types which are excluded as described in Resolution MEPC.231(65), Table 2., similar to EEDI:
About EEXI
The EEXI (Energy Efficiency eXisting ship Index) measures CO2 emissions per transport work, purely considering the ship’s design parameters. EEXI does not require any measurement or reporting of true CO2 emissions while the ship is in operation. EEXI is the sister to EEDI, Energy Efficiency Design Index, which has been in force since 2013. Both these indexes measure the same in practice, with the difference that EEDI is applied to new ships while EEXI applies to existing vessels.
Ships have to approve the attained EEXI value once in a life-time latest by the first periodical survey in 2023. It is mandatory for each vessel from 2023 onwards to have a compliant EEXI value & EEXI technical file to be approved by class. Unlike the CII (Carbon Intensity Index) the EEXI does not require any measurement or reporting of true CO2 emissions while the ship is in operation. The EEXI purely measures CO2 emissions per transport work considering the ship’s design parameters only.
As shown below, the simplified EEXI formula is a statement of the estimated CO2 emissions per transport work (grams of CO2 per ton-mile). The detailed EEXI formula takes into account main engine emissions, auxiliary engine emissions, shaft motor, Innovative energy efficiency technology for reduction of main engine power, Innovative energy efficiency technology for reduction of auxiliary engine power and ship-type specific correction factors.
Reduction Factors
From 2023 onwards, existing ships of 400 GT and above must calculate and fall below the EEDI reference line. For certain vessels types above a specific gross tonnage, a reduction factor is applied which makes the rules more stringent. The reduction factor is a CO2 reduction percentage that ships must comply with. These vary per ship type and size and are shown below.
How to comply
If your vessel does not comply with EEXI, you can consider the following operational measures or energy efficiency technologies. The Decarbonizer tool can give you insights into how much some of these measures will cost you. Contact the helpdesk for more help and clarifications!
Propulsion and engine optimizations
Engine Power Limitation (EPL)
Low friction coating
Low resistance rudder
Optimized propeller design
Hull air lubrication system
Wind assistance sails
Heat recovery systems
Solar PV
References
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MEPC - 2021 Guidelines on the method of calculation of the attained Energy Efficiency Existing Ship Index (EEXI)
NAPA - The basics of EEXI
ClassNK - Outlines of EEXI Regulation
Germanischer Lloyd - Guidelines for Determination of the Energy Efficiency Design Index
Shipowners Club - EEXI: Applicable Ship Types and Reduction Factors
Bureau Veritas - CII and EEXI Regulation
NeRF - Q&A regarding EEXI and CII
