A Short Note on Ship’s Energy Efficiency: EEDI, SEEMP & EEOI

The Energy Efficiency Design Index (EEDI) was made mandatory for new ships and the Ship Energy Efficiency Management Plan (SEEMP) for all ships at MEPC 62 (July 2011) with the adoption of amendments to MARPOL Annex VI (resolution MEPC.203(62)), by Parties to MARPOL Annex VI. This was the first legally binding climate change treaty to be adopted since the Kyoto Protocol. The new MARPOL Annex VI Chapter 4: Energy Efficiency requirements Enter into force on 1 January 2013.

Energy Efficiency Design Index (EEDI):

  • It is an index quantifying the amount of carbon dioxide that a ship emits in relation to the goods transported.
  • indication of energy efficiency by CO2 emission (g) per cargo carry (ton mile) The actual EEDI of a vessel is called the “attained EEDI” and is calculated based on guidelines published by IMO. The result must be below the limit “required EEDI” prescribed in MARPOL.
  • For existing vessels, the EEDI is in most cases irrelevant. It will become relevant only if a ship undergoes a major conversion that is so extensive that the ship is regarded by the Administration as a newly constructed ship.
  • For new ships, a technical file must be created showing the attained EEDI and its calculation process.
  • The EEDI and the technical file will be subject to verification by the flag administration.

(New ship means a ship:
.1 for which the building contract is placed on or after 1 January 2013; or
.2 in the absence of a building contract, the keel of which is laid or which is at a similar stage of construction on or after 1 July 2013; or
.3 the delivery of which is on or after 1 July 2015.)

123 Source: IMO presentation on MARPOL Annex VI Chapter 4

Examples of energy efficiency design measures for EEDI reduction: 134
Source: MEPC 63

Ship Energy Efficiency Management Plan (SEEMP):

  • The Ship Energy Efficiency Management Plan (SEEMP) is an operational measure that establishes a mechanism to improve the energy efficiency of a ship in a cost-effective manner.
  • The SEEMP also provides an approach for shipping companies to manage ship and fleet efficiency performance over time using
  • The SEEMP seeks to improve a ship’s energy efficiency through four steps; i. Planning, ii. Implementation, iii. Monitoring & measures, iv. Self-evaluation & improvement.
  • All ships must have a SEEMP on board before the issuance of the first IEEC.
  • All vessels of ≥ 400 GT, to be provided with a ship-specific SEEMP not later than the first intermediate or renewal survey (whichever is first) on or after 1 January 2013.

Examples of energy efficiency operational measures to maintain SEEMP onboard ships:

Source: MEPC 63

Energy Efficiency Operational Indicator (EEOI):

  • An efficiency indicator for all ships (new and existing) obtained from fuel consumption, voyage (miles) and cargo data (tonnes)
  • In its most simple form the Energy Efficiency Operational Indicator is defined as the ratio of mass of CO2 (M) emitted per unit of transport work

In order to establish the EEOI, the following main steps will generally be needed:

  1. define the period for which the EEOI is calculated
  2. define data sources for data collection;
  3. collect data;
  4. convert data to appropriate format; and
  5. calculate EEOI.




  • j is the fuel type;
  • i is the voyage number;
  • FCi j is the mass of consumed fuel j at voyage i;
  • CFj is the fuel mass to CO2 mass conversion factor for fuel j;
  • mcargo is cargo carried (tonnes) or work done (number of TEU or passengers) or gross tonnes for passenger ships; and
  • D is the distance in nautical miles corresponding to the cargo carried or work done.

The unit of EEOI depends on the measurement of cargo carried or work done, e.g.tonnes CO2/(tonnes • nautical miles), tonnes CO2/(TEU • nautical miles), tonnes CO2/(person • nautical miles), etc.



International Energy Efficiency Certificate (IEEC):

It is a newly introduced certificate that is mandatory for all vessels of 400 gross tonnage and above.

  • Contrary to most statutory certificates, the IEEC is not connected to a survey scheme and does not have an expiry date.
  • For new ships, the certificate will state both the attained and required EEDI of the vessel.
  • For new ships, an IEEC is to be issued at the vessel’s initial survey provided the EEDI has been verified (for applicable vessels) and the SEEMP is on board.
  • For existing ships, the IEEC is to be issued on the first intermediate or renewal survey for the IAPP certificate (whichever comes first) on or after 1 January 2013 provided the SEEMP is on board.

(Existing ships means: any ship which does not fall under the definition of a “new ship”.)

  • Additionally, the IEEC must be re-issued in the case of a major conversion.

(A Major Conversion as defined in Annex VI means a conversion:
.1 which substantially alters the dimensions, cargo capacity or engine power of the ship or
.2 which changes the type of the ship; or
.3 the intent of which in the opinion of the Administration is substantially to prolong the life of the ship; or
.4 which otherwise so alters the ship that, if it were a new ship, it would become subject to relevant provisions of the present Convention not applicable to it as an existing ship; or

.5 which substantially alters the energy efficiency of the ship and includes any modifications that could cause the ship to exceed the applicable required EEDI as set out in regulation 21 of Annex VI.)

EEDI Technical File:

The EEDI Technical File is the basic document for the EEDI certification and includes all EEDI relevant data and information and EEDI calculation.

Part A

  • General information of a ship
  • Principal particulars
  • Main engine(s) particulars
  • Auxiliary engine(s) particulars
  • Particulars of shaft generator
  • Particulars of shaft motors (PTI)
  • Particulars innovative electrical auxiliary systems
  • Particulars of innovative technologies reducing main engine power for propulsion
  • Model test information
  • Reference speed

Part B

  • EEDI Calculation &
  • Correction factors details


  1. imo.org
  2. dnvgl.com



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