CII – Carbon Intensity Indicator

CII overview

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The CII in a nutshell

The CII (Carbon Intensity Indicator) measures how efficiently a vessel above 5,000 GT transports goods or passengers and is given in grams of CO2 emitted per cargo-carrying capacity and nautical mile. 

The first reporting of the CII based on 2023 data is due no later than 31 March 2024. Vessels will receive a rating of A (major superior), B (minor superior), C (moderate), D (minor inferior) or E (inferior performance level). The rating thresholds will become increasingly stringent towards 2030. A vessel rated D for three consecutive years or rated as E, will need to develop a plan of corrective actions.

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Connection between the CII, DCS and SEEMP Part III

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From 2024, at the latest by 31 March, the CII must be calculated and reported to the DCS verifier together with the aggregated DCS data for the previous year, including any correction factors and voyage adjustments. 

In case of a D rating for three consecutive years or one E rating, the SEEMP Part III must be updated with a corrective action plan and verified before the SoC can be issued. The deadline for the SoC issuance remains the same (31 May). The corrective action plan should consist of an analysis of why the required CII was not achieved and include a revised implementation plan.

The intention of the enhanced SEEMP is to ensure continuous improvement, and its implementation will be subject to company audits. 

Calculation of the CII

The CII unit is “grams of CO2 emitted per cargo-carrying capacity and nautical mile”, whereby cargo capacity is either deadweight or gross tons depending on ship type. In addition, to cater for special design and operational circumstances, the correction factors and voyage adjustments can be applied to the basic CII calculations for the purposes of determining the rating.

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How DNV can help you with the CII

CII – Class services

As a DCS customer, you have access to the Emissions Insights dashboard on the Veracity platform, where you can monitor the preliminary CII rating of each of your ships and entire fleet. This enables you to be aware of how the upcoming IMO CII rating will affect your fleet.

CII – Advisory services

Our advisory experts help you to develop decarbonization strategies and reduction plans. With our solutions, you can navigate the many options and ensure compliance with IMO requirements and those of other stakeholders. 

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Related links

New DCS reporting scheme for CII correction factors and out-of-scope activities for MRV

Read our news from 19 September 2022

SEEMP Part III

Learn more on our theme page

MRV and DCS

All information and services that help you to comply with the EU-MRV and IMO-DCS directives hassle-free

EEXI – Energy Efficiency Existing Ship Index page

Learn more on our theme page

Decarbonize shipping

Get more insights on our information hub

IMO’s work to cut GHG emissions from ships

Visit the IMO webpage

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