EEXI Revision after a New Retrofit or Conversion

Do you wonder what to do with the EEXI revision after a major retrofit or conversion? When shall new Technical File(s) be submitted for approval?

Concept

The EEXI requirement came into effect on 1 January 2023, and all affected ships should now comply. To maintain compliance, any ship undergoing changes that affect its EEXI and/or EEDI may need to recalculate these. This statutory news outlines impacts on and necessary actions for energy efficiency certification (EEXI revision) following ship modifications.

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 revision 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 EEXI Revision.

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 EEDI/EEXI Revision Technical File

If the conversion is considered major, the EEXI revision and, if relevant, the EEDI should be recalculated, and the new Technical File(s) should be 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 revision Technical File.

Approval is managed through Class EEXI revision tools on the relevant platforms. The EEXI revision tools can be accessed via detailed guidelines on how to use the tools available on the same page. The only exception is for MARPOL ship type changes, which are currently not supported by the tools.

Survey and certification after ship alteration

Upon completing the alteration, a survey shall be conducted to confirm the new EEXI revision and, if relevant, the EEDI. This survey will also verify any measures installed due to the new calculations, such as power limitations. Once the survey is completed, a new IEEC will be issued to reflect the updates.

The validity of the IEEC will be verified during annual statutory surveys. Additionally, the PSC guidelines include checks to determine if the ship has undergone a major conversion or if there have been changes affecting aspects covered by the EEXI or EEDI Technical Files.

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.

Recommendations

When planning any alterations, it is essential to determine early on whether the changes will be considered a major conversion under MARPOL Annex VI. Assess the potential impact of the alterations and ensure that the ship remains compliant upon completion of the alteration.

References

• Re-certification of the EEXI
• Efficient handling of propeller retrofits
• EEXI advisory services by DNV Maritime
• EEXI | Energy Efficiency Existing Ship Index
• Energy Efficiency Design Index advisory service
• Energy Efficiency Design Index Calculator

See Also

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Carbon regulations targeting older, less efficient ships. Is it wiser to retrofit an existing vessel to improve its ratings, or replace it with a newbuild?

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Ship Nerd