The International Maritime Organization (IMO) has implemented three regulatory measures to drive the short-term reduction of CO2 emissions by improving the energy efficiency of the world fleet. The Energy Efficiency Design Index (EEDI) and the Energy Efficiency Existing Ships Index (EEXI) aim to rate the technical efficiency of ship designs by evaluating theoretical emissions from a vessel, its design characteristics, and installed equipment onboard. The Carbon Intensity Index (CII) focuses on the operational efficiency of a vessel, giving an efficiency rating based on reported fuel consumption, emissions, and transport work done throughout a calendar year. In 2013, the EEDI became the first of these regulations to enter into force and was applied to newbuilds only. Both the EEXI and the CII were introduced on 1 January 2023 and are applicable fleetwide.
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