The shipping industry is currently undergoing a green revolution. The focus is on two key measures of the International Maritime Organisation (IMO): EEXI and CII (also known as UEFI). This article provides an easy-to-understand eexi uefi explanation, explains the background, implementation and gives practical tips for ship owners, shipping companies and logistics service providers.
With the aim of reducing the CO₂ fleet intensity by 40 % below the 2008 level by 2030, the IMO introduced two environmental regulations: the Energy Efficiency Existing Ship Index (EEXI) and the Carbon Intensity Indicator (CII) from 1 January 2023. IMO EEXI & CII FAQ.
EEXI is a technical index for evaluating existing ships ≥ 400 GT, which calculates the so-called attained EEXI based on engine power, consumption and size. This must be below a "required EEXI" threshold. Further details are provided by DNV .
The Carbon Intensity Indicator (CII) was introduced in 2023, measures the operational CO₂ efficiency in g CO₂/tonne-mile and leads to an annual classification from A to E. Information on logic, operational data and reporting obligations can be found in the IMO FAQ .
| Measure | Focus | Mandatory period | Main requirement |
|---|---|---|---|
| EEXI | Technical efficiency | once, for changes | attainment ≤ required |
| CII | Operational business | annually from 2023 | Rating A-E, plan for D/E |
Together they form the eexi uefi declaration for CO₂ reduction.
DNV and Remoment studies show that such measures effectively support EEXI and CII targets.
The SEEMP (Ship Energy Efficiency Management Plan) was updated in 2023 to cover both EEXI and CII - including Corrective Action Plans in the event of a poor rating.
What does UEFI mean?
UEFI = EEXI + CII, the comprehensive environmental regulation of the IMO.
Does every ship have to update the SEEMP?
Yes, the SEEMP has included EEXI and CII-relevant measures since 2023.
What sanctions apply in the event of non-compliance?
Fines, driving bans or flag state measures.
How do I improve my CII rating?
Through slow steaming, better route planning and technological retrofits.
EEXI = one-off, technical measure.
CII = annual operational assessment.
Early action avoids sanctions, increases competitive advantages and prepares for future regulations.
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