EEXI & UEFI - Environmental rules simply explained

September 30, 2025
Reading time: 5 minutes

The shipping industry is facing one of the biggest challenges in its history: the reduction of CO₂ emissions. In order to achieve global climate targets and reduce CO₂ emissions from maritime transport, various environmental regulations have been introduced that oblige shipping companies and exporters to monitor and reduce their emissions. Two of these important regulations are the EEXI (Energy Efficiency Existing Ship Index) and the UEFI (Upgrading Energy Efficiency Index). But what exactly is behind these acronyms and how do these regulations affect companies in the shipping industry? In this article, we explain the EEXI and UEFI simply and clearly so that you know exactly what to expect.

1. what are EEXI and UEFI?

The EEXI and the UEFI are among the most important new environmental requirements of the International Maritime Organisation (IMO) and are part of the strategic initiative to drastically reduce CO₂ emissions in international shipping. These regulations aim to improve the energy efficiency of ships and thus reduce their CO₂ emissions. While the EEXI assesses the energy efficiency of existing ships, the UEFI focuses on the technical upgrading and improvement of ships.
Both regulations are part of the IMO Action Plan, which was introduced as mandatory for shipping companies in 2023. These requirements are not only a challenge, but also an opportunity for companies to position themselves as sustainable and environmentally conscious.

2 EEXI - Energy Efficiency Existing Ship Index

The Energy Efficiency Existing Ship Index (EEXI) is a key figure that measures the energy efficiency of an existing ship. The aim of this regulation is to encourage the shipping industry to operate more efficiently, minimising CO₂ emissions. The EEXI takes into account factors such as the weight of a ship, its size and the engine in order to relate the energy consumption to the goods transported.

2.1 How does the EEXI work?

The EEXI is based on a calculation that takes into account various parameters of a ship, including

  • Ship type and size: A smaller ship tends to be more efficient than a larger one, which requires more energy for the same amount of cargo.
  • Motor power and drive technology: Ships with older or less efficient engines must be upgraded to fulfil the requirements of the EEXI.
  • Consumption data: The EEXI also includes data on fuel consumption and emissions.

Ships that do not fulfil the EEXI requirements must take measures to improve their energy efficiency. These improvements can be achieved through technical adjustments such as the installation of wind or solar drives, more efficient propellers or better route planning.

2.2 What are the consequences if the EEXI is not fulfilled?

Ships that do not fulfil the EEXI are given a deadline by the competent authorities to retrofit. If this deadline passes, sanctions may be imposed, such as restrictions on driving licences or heavy fines.

3 UEFI - Upgrading Energy Efficiency Index

The UEFI (Upgrading Energy Efficiency Index) is an additional measure that supports the EEXI and is intended to encourage companies to technically upgrade their ships in order to further improve energy efficiency. The UEFI is specifically focussed on technical upgrades and will be introduced for ships that already comply with the EEXI but are not performing optimally in terms of energy efficiency.

3.1 How does the UEFI work?

The UEFI evaluates the effect of subsequent improvements to ship mechanisms aimed at increasing energy efficiency. These include, for example:

  • Improved drive systems: This includes the installation of more efficient motors or retrofitting with more environmentally friendly fuels.
  • Optimisation of the ship's hull: Improving the shape of the hull, for example by installing innovative technologies such as Air Lubrication Systems, reduces resistance in the water and thus increases energy efficiency.
  • Automation and digital solutions: The use of big data, artificial intelligence and machine learning to analyse ship journeys helps to optimise fuel consumption.

3.2 UEFI: The path to long-term improvement in energy efficiency

The introduction of the UEFI shows a clear direction in shipping: a continuous improvement in energy efficiency through constant upgrading and technological innovation. Ships that implement the UEFI can not only reduce their emissions, but also position themselves as technology leaders in the industry.

4 EEXI & UEFI - The impact on the shipping industry

For shipping companies, the introduction of the EEXI and UEFI represents a profound change in the way they operate. Whilst the regulation of energy efficiency may initially appear costly, in the long term they offer numerous advantages, both from an environmental and economic perspective.

4.1 Cost-benefit analysis

Adapting to the EEXI and UEFI requirements requires initial investment in technological upgrades and retrofits. However, these expenses can be offset by long-term savings in operating costs, particularly fuel and emissions taxes. In addition, companies that invest early in improving their efficiency will benefit from a competitive advantage on the global market.

4.2 Future requirements and development

In addition to the EEXI and UEFI requirements, even stricter environmental regulations could be introduced in the future. It therefore makes sense for companies to invest in sustainable technologies now in order to be prepared for future challenges.

5. checklist: How to fulfil EEXI & UEFI

StepDescription of the
1st EEXI analysisCheck whether your vessel meets the EEXI criteria by analysing its size, engine power and consumption data.
2. technical upgradesIf necessary, retrofit your ships with more environmentally friendly technologies such as wind propulsion or more efficient engines.
3. certificationHave your ships certified by a recognised authority that they comply with the EEXI and UEFI requirements.
4. develop a long-term strategyPlan your ship fleet for long-term energy efficiency improvements and integrate sustainable technologies.

6. FAQ - Frequently asked questions about EEXI & UEFI

What happens if a ship does not fulfil the EEXI?
Ships that do not fulfil the EEXI must make technical adjustments and retrofit themselves within a specified period of time. Otherwise, they may be subject to restrictions on certain routes or harbours.

What are the main differences between EEXI and UEFI?
The EEXI relates to the energy efficiency of existing ships, while the UEFI focuses specifically on upgrading and optimising ships to improve their energy efficiency.

How can companies implement the UEFI specifications?
The implementation of the UEFI requires a technical upgrade of the ships in order to maximise their efficiency. This includes the installation of more efficient propulsion systems or the use of alternative fuels.

7. conclusion

EEXI and UEFI are important regulations that oblige companies in the shipping industry to improve their energy efficiency and reduce CO₂ emissions. These regulations not only offer the opportunity to reduce operating costs in the long term, but also to position themselves as pioneers in sustainable shipping. Shipping companies that respond to these changes at an early stage not only secure a competitive advantage, but also make an important contribution to climate protection.

For more information on sustainable solutions in international transport, visit ODS Orient: RoRo shipping Europe - The guide.

Disclaimer: All information in this article has been carefully researched but is subject to change at any time. ODS Orient accepts no liability for the topicality, accuracy and completeness of the information provided.

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