EEDI (Energy Efficiency Design Index)

The Energy Efficiency Design Index is the mandatory IMO metric, in force since 2013 under MARPOL Annex VI Chapter 4, that sets a maximum grams of CO2 per tonne-mile for new ships by type and size. The attained EEDI from sea-trial power and a reference speed must fall below a required value that tightens in phases against a baseline reference line. It pushes hull, engine, and propulsion efficiency at the design stage, and is the new-build counterpart to the EEXI applied to existing ships.