EEXI

The Energy Efficiency Existing Ship Index applies the EEDI design metric retroactively to ships already in service, required from 1 January 2023 under MARPOL Annex VI Reg.23. Each ship of 400 GT and above computes an attained EEXI that must sit below a required value derived from the EEDI reference line with a ship-type reduction factor. Most owners comply through engine power limitation or shaft power limitation rather than physical modification, capping installed power to lift the calculated index. It is a one-time technical certification, unlike the annual operational CII.