Appendix – Calculation of Energy Efficiency Operational Indicator (EEOI) Based on Operational Data

 The objective of the Appendix is to provide guidance on calculation of the Energy Efficiency Operational Indicator (EEOI) based on data from the operation of the ship.

 Primary data sources selected could be the ship’s log-book (bridge log-book, engine log-book, deck log-book and other official records).

 C_F is a non-dimensional conversion factor between fuel consumption measured in g and CO₂ emission also measured in g based on carbon content. The value of C_F is as follows:

 The basic expression for EEOI for a voyage is defined as:

Where average of the indicator for a period or for a number of voyages is obtained, the Indicator is calculated as:

Where:

• j is the fuel type;
• i is the voyage number;
• FC _{i j} is the mass of consumed fuel jat voyage i;
• C _Fj is the fuel mass to CO₂ mass conversion factor for fuel j;
• m _cargo 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.

It should be noted that Equation 2 does not give a simple average of EEOI among number of voyage i.

 Rolling average, when used, can be calculated in a suitable time period, for example one year closest to the end of a voyage for that period, or number of voyages, for example six or ten voyages, which are agreed as statistically relevant to the initial averaging period. The Rolling Average EEOI is then calculated for this period or number of voyages by Equation 2 above.

 For a voyage or period, e.g., a day, data on fuel consumption/cargo carried and distance sailed in a continuous sailing pattern could be collected as shown in the reporting sheet below.

NOTE: For voyages with m _cargo =0, it is still necessary to include the fuel used during this voyage in the summation above the line.

 The CO₂ indicator may be converted from g/tonne-mile to g/tonne-km by multiplication by 0.54.

 A simple example including one ballast voyage, for illustration purpose only, is provided below. The example illustrates the application of the formula based on the data reporting sheet.

unit: tonnes CO₂/(tons • nautical miles)