Energy Efficiency Design IndexEEDI
An IMO design standard that caps the CO₂ emitted per unit of transport capacity for newly built ships.
The Energy Efficiency Design Index (EEDI) sets a maximum CO₂ output per capacity-mile for new ships above a size threshold, calculated from installed power, fuel and capacity at the design stage. Required values tighten in phases, pushing each new generation to be more efficient.
EEDI applies to newbuildings; its existing-ship analog is the EEXI. Both sit under MARPOL Annex VI, the air-pollution annex of the IMO’s anti-pollution convention.
On The Maritime
Also known as: EEDI, energy efficiency design index.
Related terms
Energy Efficiency Existing Ship IndexEEXI
A one-time IMO design-efficiency standard that existing ships must meet, the in-service counterpart of the EEDI for new ships.
Carbon Intensity IndicatorCII
An IMO operational measure of how much CO₂ a ship emits per unit of transport work, graded A–E each year.
International Maritime OrganizationIMO
The United Nations agency that sets global rules for ship safety, security and pollution prevention.
Newbuilding
A ship ordered new from a shipyard — and the forward orderbook of such vessels that signals future fleet supply.
Plain-English reference definition — our own explanation of a standard shipping concept, not a licensed source or legal advice. See the full glossary or the broader maritime dictionary.
Last reviewed: June 2026.