CII – Carbon Intensity Indicator

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Implementation of the CII

On or before 1 January 2023, all ships above 5,000 GT need to have an approved enhanced Ship Energy Efficiency Management Plan (SEEMP), including an implementation plan on how to achieve the CII targets. The yearly CII is calculated based on reported IMO DCS data, and the ship is given a rating from A to E. For ships that achieve a D rating for three consecutive years or an E rating in a single year, a corrective action plan needs to be developed as part of the SEEMP and approved. 

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

A vessel can reduce its carbon intensity by a combination of measures:

  • Speed reduction
  • Optimization of operations and logistics
  • Implementation of energy efficiency technologies
  • Use of alternative fuels 

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Calculation of the CII

The basic calculation methods and CII trajectories were adopted at MEPC 76 in June 2021 (the unit is grams of CO2 emitted per cargo-carrying capacity and nautical mile). The CII calculation will be further improved through correction factors in a separate guideline that will be developed next year. 

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Related links

EEXI – Energy Efficiency Existing Ship Index page

Covering implementation, calculation, FAQs, services and more

EU MRV and IMO DCS page

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

Decarbonization in shipping page

Regulatory overview, services and more

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