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• 2022-04-25
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The goal of the International Maritime Organization (IMO) is to reduce greenhouse gas emissions by 40 percent until 2030 and subsequently by another 50 percent until 2050. To achieve these targets, the "Energy Efficiency Existing Ship Index" (EEXI) will come into force in June 2021 and will apply to all vessels over 400 GT under MARPOL Annex VI from 2023 onwards.

For each ship an EEXI Technical File must be prepared. The EEXI Technical File contains general information on the ship, the calculation of the EEXI value attained and required, and copies of the documents from which the values applied for the EEXI calculation are taken. The EEXI Technical File is to be submitted to class for approval. The verification of EEXI compliance takes place during the first annual, intermediate or renewal survey after coming into force of the EEXI requirements.

With implementation of the EEXI, the issuance of a new International Energy Efficiency (IEE) Certificate is required for each ship. This certificate refers to the EEXI Technical File. In the rare cases where the attained EEDI already complies with EEXI requirements, which means for most types of ships that these ships were already built in accordance with EEDI Phase 2 or 3 requirements in the past, no additional EEXI Technical File is needed.

The EEXI Technical File should be written at least in English and should include, but not be limited to:

1. Deadweight (DWT) or gross tonnage (GT) for RO-RO passenger ship and cruise passenger ship having nonconventional propulsion;
2. The rated installed power (MCR) of the main and auxiliary engines;
3. The limited installed power (MCR_lim.) in cases where the over ridable Shaft / Engine Power Limitation system is installed;
4. the ship speed (V_ref);
5. the approximate ship speed (V_ref,app) for pre-EEDI ships in cases where the speed-power curve is not available, as specified in paragraph 2.2.3.5 of the EEXI Calculation Guidelines;
6. an approved speed-power curve under the EEDI condition as specified in paragraph 2.2 of the EEDI Calculation Guidelines, which is described in the EEDI Technical File, in cases where regulation 22 of MARPOL Annex VI (Attained EEDI) is applied;
7. an estimated speed-power curve under the EEDI condition, or under a different load draught to be calibrated to the EEDI condition, obtained from tank test and/or numerical calculations, if available;
8. estimation process and methodology of the power curves, as necessary, including documentation on consistency with the defined quality standards (e.g. ITTC 7.5-03-01-02 and ITTC 7.5-03-01-04 in their latest revisions) and the verification of the numerical set-up with parent hull or the reference set of comparable ships in case of using numerical calculations;
9. a sea trial report including sea trial results, which may have been calibrated by the tank test, under the sea condition as specified in paragraph 2.2.2 of the EEDI Calculation Guidelines, if available;
10. calculation process of V_ref,app for pre-EEDI ships in cases where the speed-power curve is not available, as specified in paragraph 2.2.3.5 of the EEXI Calculation Guidelines;
11. type of fuel;
12. the specific fuel consumption (SFC) of the main and auxiliary engines, as specified in paragraph 2.2.3 of the EEXI Calculation Guidelines;
13. the electric power2 for certain ship types, as necessary, as defined in the EEDI Calculation Guidelines;
14. the documented record of annual average figure of the auxiliary engine load at sea obtained prior to the date of application for a survey for verification of the ship's EEXI, as specified in paragraph 2.2.2.3 of the EEXI Calculation Guidelines, if applicable;
15. calculation process of P_AE,app, as specified in paragraph 2.2.2.3 of the EEXI Calculation Guidelines, if applicable;
16. principal particulars, ship type and the relevant information to classify the ship as such a ship type, classification notations and an overview of the propulsion system and electricity supply system on board;
17. description of energy saving equipment, if available;
18. calculated value of the attained EEXI, including the calculation summary, which should contain, at a minimum, each value of the calculation parameters and the calculation process used to determine the attained EEXI; and
19. for LNG carriers:
    1. type and outline of propulsion systems (such as direct drive diesel, diesel electric, steam turbine);
    2. LNG cargo tank capacity in m3 and BOR as defined in paragraph 2.2.5.6.3 of the EEDI Calculation Guidelines;
    3. shaft power of the propeller shaft after transmission gear at 100% of the rated output of motor (M_PPMotor) and η(i) for diesel electric;
    4. shaft power of the propeller shaft after transmission gear at the de-rated output of motor (M_{PPMotor, lim}) in cases where the over ridable Shaft / Engine Power Limitation is installed;
    5. maximum continuous rated power (MCR_SteamTurbine) for steam turbine;
    6. limited maximum continuous rated power (MCR_{SteamTurbine,lim}) for steam turbine in cases where the over ridable Shaft / Engine Power Limitation is installed; and
    7. SFC_SteamTurbine for steam turbine, as specified in paragraph 2.2.7.2 of the EEDI Calculation Guidelines. If the calculation is not available from the manufacturer, SFC_SteamTurbin may be calculated by the submitter.

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