Regulation Dictionary Entry
Energy Efficiency Existing Ship Index (EEXI)
"A technical design standard by the IMO that requires existing ships to maximize their energy efficiency to a level equivalent to newbuilds (EEDI Phase 2 or 3)."
Definition
The Energy Efficiency Existing Ship Index (EEXI) is a one-time certification targeting the technical design of existing ships. It addresses the equipment and design parameters, such as engine power and hull efficiency.
Compliance Methods
To meet EEXI requirements, ships often employ:
- Engine Power Limitation (EPL): Physically or electronically limiting the maximum engine power.
- Shaft Power Limitation (ShaPoLi): Limiting the power transmitted to the propeller.
- Energy Saving Devices: Installing Mewis ducts, rudder bulbs, or air lubrication systems.
Difference from CII
While EEXI is a one-time technical certification (like a passport), CII is an annual operational rating (like a report card).
Related Terms
CIISEEMPDecarbonization