The EEXI, or Energy Efficiency Existing Ship Index, is a measure of a ship's energy efficiency. It is an essential tool introduced by the International Maritime Organization (IMO) to reduce greenhouse gas emissions from existing ships.
Understanding EEXI
EEXI is a technical measure that aims to:
- Assess the energy efficiency of existing ships.
- Help in setting a minimum energy efficiency standard that ships need to meet.
- Drive the shipping industry toward greater sustainability.
Key Components of EEXI
The EEXI calculation involves:
- Installed Power: The total power of the ship's main engine and any auxiliary engines.
- Capacity: The deadweight tonnage (DWT) of the ship.
- Correction Factors: Factors that take into account specific design features and technologies implemented on the vessel.
How EEXI Works
The EEXI calculation results in an index value. This value is then compared to a required EEXI limit set by the IMO. Ships that have a higher EEXI than the required value are considered less efficient and will need to take technical measures to improve.
Example of EEXI Application
Imagine a cargo ship with a calculated EEXI of 20. If the required EEXI for that type and size of ship is 18, then the ship is not meeting the standards. To comply, the shipowner might need to:
- Install engine power limitation technology.
- Make modifications to the hull to reduce resistance.
- Use energy-saving devices.
Why is EEXI Important?
- Climate Change Mitigation: EEXI is a crucial part of the global effort to reduce greenhouse gas emissions from maritime transport.
- Regulatory Compliance: Ships must comply with EEXI regulations to continue operating legally.
- Efficiency Improvements: The EEXI drives the shipping industry towards adoption of more efficient and environmentally friendly technologies.
EEXI in Practice
| Aspect | Details |
|---|---|
| What it is | Energy Efficiency Existing Ship Index – a measure of a ship's energy efficiency. |
| Purpose | To reduce greenhouse gas emissions from existing ships and set minimum energy efficiency standards. |
| Calculation | Based on installed power, capacity, and correction factors. |
| Compliance | Ships must meet a required EEXI limit by making technical adjustments if necessary. |
| Impact | Drives the shipping industry towards adopting more efficient and environmentally friendly technologies. |
The EEXI plays a pivotal role in the IMO's strategy to achieve significant reductions in greenhouse gas emissions from the maritime sector. It ensures that existing vessels, not just new builds, contribute to a more sustainable future for shipping.
