The maritime industry is in the midst of a transformative shift, focusing on boosting energy efficiency and cutting down greenhouse gas (GHG) emissions. Central to this evolution are key initiatives (EEXI, CII) by the International Maritime Organization (IMO). While the Energy Efficiency Existing Ship Index (EEXI) focuses on setting technical standards to ensure ships meet specific energy efficiency requirements, the Carbon Intensity Indicator (CII) Rating assesses the operational performance of vessels to promote continuous improvement in their carbon emissions. In this article, we’ll demystify EEXI, highlight its significance, and outline the steps to achieve compliance if your vessel does not currently meet EEXI requirements. What is EEXI? The EEXI is a measure designed to evaluate the energy efficiency of existing ships. It applies to all vessels with a gross tonnage of over 400 tons and is part of the IMO’s broader strategy to cut GHG emissions from shipping by at least 40% by 2030 compared to 2008 levels. EEXI came into effect on 1st January 2023. Consider the EEXI as a benchmark for evaluating your ship’s energy efficiency. The EEXI is similar to the Energy Efficiency Design Index (EEDI), but while the EEDI applies to ships which are built on or after 1st January 2013, the EEXI is retroactively applied to the existing fleet. How is the EEXI Calculated? All EEXI calculations must be conducted per IMO MEPC Guidelines. To comply with the EEXI, each ship needs to carry out technical or operational advancements. Here’s a simplified breakdown of how this works: Attained EEXI: This is a measure of your ship’s actual energy efficiency. It’s calculated based on the ship’s design and operational data. Required EEXI: This is the benchmark or target your ship needs to meet as per IMO Guidelines and requirements. It’s based on the EEDI baseline, adjusted with a reduction factor that depends on the type of vessel. The goal is to ensure that your vessel’s Attained EEXI is equal to or better than the Required EEXI. Relevant Guidelines for EEXI Calculation The relevant guidelines of EEXI regulation were adopted at MEPC: Index of MEPC Resolutions and Guidelines related to MARPOL Annex VI (imo.org) Guidelines on the Method of Calculation of the Attained EEXI (MEPC.350(78)) Provides a comprehensive method for calculating the attained EEXI. Specifies parameters that differ from those in the EEDI Calculation Guidelines. Guidelines on Survey and Certification of the Attained EEXI (MEPC.351(78)) Outlines the process for surveying and certifying the attained EEXI. Details of the contents required in the EEXI Technical File and additional information needed for EEXI verification. Guidelines on the Shaft/Engine Power Limitation System and Use of a Power Reserve (MEPC.335(76)) Defines the technical and operational conditions the SHaPoLi/EPL system must meet to comply with EEXI requirements and utilize a power reserve. Lists the necessary contents to be included in the Onboard Management Manual (OMM). Key Steps for Compliance Fleet Assessment and EEXI Calculation Start by assessing your fleet to understand each vessel’s current energy efficiency. Utilize the EEXI calculation tools provided by classification societies, which help identify which vessels fall short of the required efficiency standards and need modifications. Consider engaging with specialized service providers, like AZOLLA who offer comprehensive EEXI calculation, Technical File and OMM documen