Energy Efficiency Existing Ship Index – Breezemarine Group

From January 1, 2023, all vessels will be required to calculate their achieved Energy Efficiency Existing Ship Index (EEXI) to measure their energy efficiency and start collecting data to report on their annual operational carbon intensity index.

Amendments to Annex VI to the International Convention for the Prevention of Pollution from Ships (MARPOL) will enter into force on November 1, 2022. These technical and operational amendments, developed as part of IMO’s initial strategy to reduce greenhouse gas emissions from ships, agreed in 2018, require ships to improve energy efficiency in the short term and thus reduce greenhouse gas emissions.

“The short-term measures to reduce greenhouse gas emissions adopted in 2021 form a comprehensive set of amendments to Annex VI to MARPOL, which provide important building blocks for IMO’s future medium-term measures to reduce greenhouse gas emissions. These latest amendments are based on IMO’s energy efficiency measures, which were first adopted in 2011 and have since been strengthened — the CII and EEXI measures represent the next stage in our work to achieve the goals set out in IMO’s Initial Greenhouse Gas Emissions Strategy.”

IMO Secretary General Kitak Lim


The Energy Efficiency Index of Existing Ships (EEXI) is a measure introduced by IMO to reduce greenhouse gas emissions by ships. EEXI is a measure related to the technical design of the vessel. Vessels must receive EEXI approval once in a lifetime, by the first periodic inspection no later than 2023.

The requirement for calculating the EEXI coefficient applies to ships with a gross tonnage of 400 or more on international voyages, of the specific types defined in Rule 23. The vessel is required before the start of the first annual, interim or renewable air pollution prevention survey (Chapter 3 of Annex VI, MARPOL), or the initial energy efficiency/carbon intensity survey (Chapter 4 of Annex VI, MARPOL), depending on which will be the first on or after January 1, 2023, calculate the achieved EEXI using the following formula:

This calculation and all the information necessary for the vessel are indicated in the “EEXI Technical File”, compiled at least in English in accordance with IMO Resolution MEPC.334(76). The technical file on EEXI should be sent to the Administration or an Organization acting on its behalf for verification.

The achieved EEXI (Attached EEXI) must be less than or equal to the required EEXI (Required EEXI) for a particular type of vessel, taking into account its size.

If calculations have shown that the achieved EEXI is greater than the required EEXI, then it is necessary to take measures to improve the energy efficiency of the vessel:

  • Propulsion optimization
  • Engine optimization
  • Fuel change

Breezemarine offers the following services:

  • Calculation of the energy efficiency coefficient for existing vessels
  • Preparation of the EEXI Technical File
  • Updating of Part I, the Energy Efficiency Management Plan
  • Updating of Part II, the Ship’s Energy Efficiency Management Plan, including:
    –  A description of the methodology to be used to calculate the ship’s achieved annual operational emission factor and the procedure for submitting data to the ship’s Flag Administration or a Recognized Organization;
    –  The required annual operating coefficient for the next three years, as specified in Rule 28, Amendments;
    –  A plan that records information on how the Required Annual Operational Carbon Intensity Indicator (CII) will be achieved in the next three years;
  • The procedure for evaluating ship systems and improvements.
In addition, we present to you our Fuel Consumption Monitoring system (FCM) – a universal tool that allows the crew and operators of ships to easily and automatically monitor bunkering, fuel consumption by the vessel and the fuel level in the tanks. Our systems are designed both to monitor the efficiency of the vessel as a whole, and to automatically collect the necessary fuel consumption data for the preparation of MRV reporting. The purpose of this development is to make the work of the shipping company more efficient and simplify the work of all its services.