The EEXI (Energy Efficiency Existing Ship Index) regulation came into effect on January 1, 2023. Ships that undergo modifications affecting their energy efficiency may need to re-calculate their EEXI and EEDI ratings to ensure continued compliance with the regulations, reports DNV.
What is a major conversion?
Under MARPOL Annex VI (Regulation 5.4), the Energy Efficiency Existing Ship Index (EEXI) and, if relevant, the Energy Efficiency Design Index (EEDI), must be recalculated and surveyed on board in the event of a major conversion, as defined in Regulation 2.2.17.
A major conversion includes:
- Any substantial change in hull dimensions or capacity, except a decrease of assigned freeboard if no other alterations to the ship structure are made.
- Any substantial increase in total engine power for propulsion (5% or more).
- A change of the MARPOL ship type as noted on the International Energy Efficiency Certificate (IEEC).
- A conversion intended to substantially prolong the life of the ship.
- Significant modifications that would require the ship to meet new requirements as if it were newly built.
- Any substantial alterations impacting energy efficiency, such as modifications that could cause the ship to exceed the applicable required EEXI or EEDI (if relevant).
If it is unclear whether a conversion is considered major, the flag administration will have the final say. For typical scenarios that may constitute a major conversion, please see DNV’s overview Re-certification of the EEXI.
EEDI compliance for extensive major conversions
If a major conversion is so extensive that the ship is considered newly constructed, the flag administration may require the ship to meet the EEDI requirements by using the reduction factor corresponding to the contract date of the conversion. In such cases, a ship originally subject only to the EEXI will also need to comply with the EEDI, and a ship already subject to the EEDI may face a more stringent EEDI requirement (a higher EEDI phase). However, most major conversions will not fall into this extensive category.
Approval of EEXI/EEDI Technical File
If the conversion is considered major, the EEXI and, if relevant, the EEDI should be recalculated, and the new Technical File(s) submitted for approval. Any necessary actions to meet the requirements should be included in the project, such as limiting the propulsion power. If installing a new or adjusting an existing overridable power limitation, an approved Onboard Management Manual (OMM) for Shaft Power Limitation (SHaPoLi) or Engine Power Limitation (EPL) will be required.
For ships subject to the EEDI, if the new attained EEDI is equal to or less than the new required EEXI, it can be considered the new attained EEXI. Consequently, the attained EEXI will be verified using the EEDI Technical File, eliminating the need for a separate EEXI Technical File.
EEXI/EEDI calculations for non-major conversions
Conversions that have an impact on energy efficiency, but which are not considered major conversions, will not require re-approval of the EEXI/EEDI Technical File(s) or a new IEEC. However, re-approving the Technical File(s) and issuing a new IEEC should be considered to reflect, for example, an improved energy efficiency index, especially in cases where SHaPoLi/EPL installations may be removed, or the power limitation is reduced.
SEEMP/CII for ship alterations
When making alterations, it is important to consider their impact on the SEEMP III and the CII calculation as well. An alteration may affect the SEEMP III, which outlines the future attained and target CII as well as future measures in the three-year implementation plan. Key parameters used in the CII equation – such as MARPOL ship type, deadweight and gross tonnage – are particularly important. Therefore, the DCS verifier should be informed in order to make the necessary updates and correctly verify the CII to assign an appropriate rating.
When DNV serves as both the class and DCS verifier, essential data for the CII calculation will be automatically captured upon updating the IEEC. For ships not classed by DNV but where DNV acts as the DCS verifier, a copy of the new IEEC, along with the new load line certificate if there is a change in deadweight, should be submitted via DATE.
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Source: DNV
