The Energy Efficiency eXisting ship Index (EEXI) is a new IMO regulation that aims to reduce CO2 emissions of existing vessels by setting minimum requirements for technical efficiency. EEXI comes into force on 1 January 2023.
The EEXI was adopted at MEPC 76 in June 2021 and will enter into force on 1 January 2023.
Different improvement measures are possible, e.g. Engine power limitation, Shaft power limitation, Engine derating, Propulsion optimization, Energy-saving devices, Please get in contact with DNV’s maritime advisory for a ship-specific evaluation.
The EEXI Technical File must be approved and the International Energy Efficiency Certificate re-issued by your flag administration or Recognized Organization at the first annual survey after 1 January 2023 at the latest.
The EEXI must be calculated for all cargo and cruise vessels above 400 GT falling under MARPOL Annex VI. In case of non-conventional propulsion (such as diesel-electric), please see MARPOL Annex VI for further clarification. In case of a major conversion, the EEXI must be recalculated. A required EEXI is applicable for all cargo and cruise vessels above a certain size threshold, depending on the ship type.
There will be an IMO review of the data in 2026.
The approval of the EEXI Technical File and the issuance of the IEEC has to be performed by the respective classification society.
The required EEXI is based on the EEDI reference lines, with the below listed reduction factors applied. This is in most cases equal to the required EEDI in Phase 2 or Phase 3.
You need to submit an EEXI Technical File to your classification society. DNV’s maritime advisory offers support by preparing such documents for you.
Yes, after approval of the EEXI Technical File by the ship’s classification society, the IEE Certificate will be re-issued
The IEE Certificate is re-issued with the first annual survey after 1 January 2023.
No – Shaft power limitation, Propulsion optimization and Energy-saving can be realised with the installation of Datum Electronics Shaft Power Meter and EEXI Control Panel Interface (Bridge mounted)
Classification societies may have certain rules in place for engine limitation (e.g. if Ice class is applicable to your vessel). Please check with your respective classification society individually.
All requirements regarding the applicable Ice class have to be considered. If it is not possible to fulfil both, Ice class and EEXI requirements, additional measures have to be considered.
You could further limit your engine output, for instance for a second time, if necessary to fulfil the requirements by installing Datum Electronics Shaft Power Meter and EEXI Control Panel Interface. Unlike rigid engine limiters, Datum’s EEXI system allows the vessel Master to retain full control of the engine output (for instances where safety is paramount, as defined by SOLAS), whilst still providing the essential data to support the regulatory needs.
Yes, except if it is an LNG carrier or cruise passenger ship.
The following documents should be submitted: EPL Report (by engine manufacturer) Survey statement by class surveyor after EPL installation, EPL Management Plan
Yes. In most cases, limiting the power range goes along with a limitation of the operational revolution range. The new operational revolution rate may cause resonance conditions, resulting in increased structural or machinery vibrations. Higher vibration levels may lead to crew discomfort, structural damages and machinery failure. If power limitation is realized by deactivating cylinders, this will completely change the engine’s dynamics, requiring a new assessment of shaft torsional vibrations and of shipboard vibration due to changed firing frequency, as well as of modified excitation forces and moments. Please contact us again to assess the specific risk for your vessel.
It is recommended to carry out a model test to predict the performance improvement of the ESD before installation. This model test result will then be used for the calculation of the attained EEXI. The decision about the installation of an ESD should be based on a model test or CFD prediction.
