About ESI
ESI Formulas
IMO Annex VI Regulations and ESIBaselines
ESI Calculation Example
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Terms of Use
ESI Fundamentals
Below an example is provided of an ESI calculation for a
specific ship. The ship in the examplehas one main engine and three
auxiliary engines. The ship uses HFO and MDO/Gasoil. For
theformulas and baselines see ESI Formulas and IMO annex
Regulations and ESI Baselines.
Main engine(s) Auxiliary engine(s)
NO Limit Value 17 11.5 g/kWh
NO Rating 15 11 g/kWh
Emission 2 0.5Rated Power 9480 970 kW
Number of engines 1 3
{(17 15) x 9480/17 + (11.5 11) x 970 x 3/11.5} x (1/9480 + 970 x
3) x 100 = 1241 x 0.008 = 10.0
The average sulphur content of the different fuels is extracted
from the bunker delivery notes.The average for the respective fuels
is the weighted average over all bunkers.
HFO HFO LS / MDO/Gasoil MDO/Gasoil LS
Baseline 3.50 1.00 0.50 % S (m/m)
Actual 2.00 0.60 0.08 % S (m/m)
For the different fuels, the relative improvement compared to
the baselines is calculated; seealso ESI formulas and IMO annex
regulations and ESI baselines
(3.50 - 2.00) / (3.5 - 1.0) x 30 + (1.00 - 0.60) / (1.0 - 0.5) x
35 + (0.50 - 0.08) / (0.5 - 0.0) x 35
= 18.0 + 28.0 + 29.4 = 75.4
Ships may choose to report on two of the EEOI data sets viz.
fuel consumption and distancesailed; the data provided should be as
described in the definitions section of the Guidelines forVoluntary
Use of the Ship Energy Efficiency Operational Indicator
(MEPC.1/Circ.684). Thereporting period for the two data sets should
coincide with the reporting period for the BDNs ofthe ship. A 10
sub-points fixed bonus will be granted to vessels submitting these
data.
Supply of data on the type of cargo and/or the value of the EEOI
is not requested but may beconsidered; a section for inclusion of
the EEOI value is provided in the Ship Owner section butits use and
completion are optional. These data will only be stored and will
not be used in thecalculation of the ESI CO Score.
For this example the ESI sub- points are as follows leading to
an ESI Score of 34.0 points:
(2 x 10.0 + 75.4 + 10.0) / 3.1 = 34.0
The presence on this ship of OPS would result in adding 35 OPS
bonus points and the following
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