Regulation Dictionary Entry
Carbon Intensity Indicator (CII)
"An operational energy efficiency measure by the IMO that rates ships on an A-E scale based on their carbon emissions per transport work (grams of CO2 per DWT-mile)."
Definition
The Carbon Intensity Indicator (CII) is a mandatory IMO measure under MARPOL Annex VI, effective from January 1, 2023. It measures how efficiently a ship transports goods or passengers and is expressed in grams of CO2 emitted per cargo-carrying capacity and nautical mile.
Rating System
Ships are given an annual rating from A (major superior) to E (inferior).
- A, B: Incentivized performance.
- C: Compliant.
- D: Requires a corrective action plan to achieve 'C' within 3 years.
- E: Requires an immediate corrective action plan.
Impact
CII forces shipowners to optimize routes, reduce speed (slow steaming), and adopt energy-saving technologies to maintain a compliant rating.
Related Terms
EEXIIMO DocumentsDecarbonization