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CII – Carbon Intensity Indicator

The CII in a nutshell

The CII (Carbon Intensity Indicator) is a measure for a ship’s energy efficiency and is given in grams of CO2 emitted per cargo-carrying capacity and nautical mile. 

The first year of the attained annual operational CII verification will be 2024 for the operation in calendar year 2023. Vessels, based on their performance, will receive an environmental 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. 

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Connection between the CII, DCS and SEEMP Part III

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Starting in 2024, the CII must be calculated and reported to the Data Collection System (DCS) verifier together with the aggregated DCS data for the previous year, including any correction factors and voyage adjustments. Deadline for DCS and CII submission remains unchanged - no later than 31 March each year.

The attained annual operational CII and the environmental rating (A to E) will be noted on the DCS Statement of Compliance (SoC), which will be required to be kept on board for five years. 

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 corrective action plan should consist of an analysis of why the required CII was not achieved and include a revised implementation plan. 

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 tonnage 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.

Simplified attained annual CII formula:

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More detailed information about Correction factors can be found at Corrected CII.

How DNV can help you with the CII

CII – Class services

As a DCS customer, your vessels’ CII including correction factors and voyage adjustments will be automatically calculated based on uploaded DCS data. You also 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 evaluate and improve your fleet performance throughout the year to be sure you meet your CII targets in the upcoming years. In case of inferior CII rating, SEEMP Part III Corrective Actions Plan can be prepared using our SEEMP Part III generator.

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. 

Related links

 

EEXI and CII requirements taking effect from 1 January 2023

Read the update from 17 January 2023

 

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

FAQs, SEEMP Plan III Generator, advisory services and more

 

IMO DCS

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

 

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

 

Decarbonization Plan

A long-term decarbonization strategy to ensure cost-effective fleet compliance.

Related on-demand webinars

 

WEBINAR on demand: MEPC 79 in focus – Revising future GHG ambitions

Watch the recording from 20 Dec 2022 and download the slide deck

 

WEBINAR on demand: Carbon Intensity Indicator (CII) – A closer look

Watch the recording and download the slide deck

 

WEBINAR on demand: EEXI and CII calculations - DNV's way forward

Watch the recording and download the slide deck

 

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