The Carbon Intensity Indicator (CII) is a rating system for ships that the International Maritime Organization (IMO) developed. This is a mandatory measure under MARPOL Annex VI, which came into force on the 1st January 2023.

The measure impacts all cargo, RoPax and cruise vessels above 5,000 gross tonnage (GT) and trading internationally.

Within three months after the end of each calendar year, ships are required to report to its flag Administration, or any RO duly authorized by it, the attained annual operational CII.

The CII determines the annual reduction factor needed to continuously improve the ship's operational carbon intensity within a specific rating level. The actual annual operational CII achieved will need to be documented and verified against the required annual operational CII.

This will then enable the operational carbon intensity rating to be determined on a scale of A, B, C, D or E, indicating a major superior, minor superior, moderate, minor inferior, or inferior performance level. The performance level will need to be recorded in the ship's Ship Energy Efficiency Management Plan (SEEMP). A ship rated D or E for three consecutive years will need to submit a corrective action plan to show how the required index rating (C or above) will be obtained.

This short-term measure aims to achieve the carbon intensity reduction aims of the IMO's initial GHG emissions strategy.

Emissions Verifier

Emissions Verifier our online verification solution enables you to input the Ship's fuel consumption, distance, voyage details, voyage adjustments and correction factors, to facilitate verification and calculation of the attained operational CII values and CII ratings.

Find out more about Emissions Verifier