EEXI – Energy Efficiency Existing Ship Index -
Boost energy efficiency,
Reduce CO2 emissions
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. MMG supports you in achieving the CO2 targets and guides you on the way to EEXI compliance.
EEXI improvement measures
- Engine power limitation: ≈37%.
- Change in fuel type from marine diesel oil (MDO) to liquefied natural gas (LNG): 25%
- Propeller retrofit with MMG-Redesign propeller 10%
- Installation of a shaft generator: 5.6%
- Installation of energy saving devices (e.g.: PBCF, wake equalizing duct): up to 4%.
- Installation of rotor sails: 3.8%
- 10% increase in transport capacity (deadweight): 3%
Recommendation for achieving the EEXI certification
In summary, engine power limitation will be the key measure to meet the EEXI requirements. However, besides the desired effect of reduced fuel oil consumption, throttling will also result in a lower maximum speed of your vessel.
To counteract this effect, a retrofit of your propeller is to be recommended. The retrofit propeller will be precisely designed for the new operating point of the engine. This will further reduce fuel consumption by up to 14% or increase the reference speed of your ship and thus improve the EEXI value of your vessel. This even opens the possibility to iteratively reduce the engine power limitation slightly, if desired.
Irrespective entry into force of the EEXI-certification, the annual check of the “Carbon Intensity Indicator” (CII) will become mandatory from the year 2023. Accordingly, the vessels will be classified into five different efficiency classes (A-E) and thereby the associated CO2 reduction targets will even become more stringent from year to year. MMGs redesign program is tested and proven for the Ship Energy Efficiency Management Plan (SEEMP) in view of the EEXI target realization. A propeller exchange can always be incorporated in a regular scheduled docking.
Our service: EEXI calculation
As a first measure, we determine the EEXI value of your vessel. There are three possible approaches:
- Calculation based on CFD simulations (very exact EEXI value, including possible improvement measures).
- Calculation based on newbuilding documentation (theoretically realistic EEXI value)
- Statistical approach based on standard values (most conservative EEXI value)
Our service: EEXI consulting
Based on the EEXI calculation, we will jointly define the necessary measures in order to meet the EEXI requirements.
If the achieved EEXI value is below the required EEXI value, your vessel will receive certification. However, if the required EEXI value is not achieved or if the engine limitation makes it impossible to operate the ship economically, a propeller retrofit is recommended as the measure with the best cost-benefit factor.
The redesigned propeller increases the top speed that was reduced by engine throttling. For the second major effect of the propeller retrofit, you have the choice between a further improvement of the EEXI value with the same power limitation or reduce the power limitation while keeping the EEXI value constant.