From 2023, all ships must calculate their Annual Efficiency Ratio (AER) and collect data to report their annual operational carbon intensity indicator (CII) and CII rating.

A step towards decarbonising international shipping 

Carbon intensity describes the link between greenhouse gas (GHG)emissions and the amount of cargo carried over the distance travelled. To help reduce the carbon intensity of all ships by 40% by 2020 compared to 2008, the International Maritime Organisation (IMO) now requires ships to calculate two ratings: an Energy Efficiency Existing Ship Index (EEXI) to determine their energy efficiency and their annual operational Carbon Intensity Indicator (CII) and associated CII rating. The first annual reporting must be completed in 2023, with initial ratings given in 2024.

CII determines the annual reduction factor needed to ensure the ship's continuous improvement   

Based on a ship's CII, its carbon intensity will be rated A, B, C, D or E. A ship rated D for three consecutive years or E for one year will have to submit a corrective action plan as part of the Ship Energy Efficiency Management Plan (SEEMP Part III) to show how the required index of C or above will be achieved. 

Hydrodynamics experts calculate and predict vessel emissions

Our skilled team excels in vessel performance and fuel consumption monitoring. We have in-house towing tank facilities and decades of experience in efficient hydrodynamics. Our CII calculator can gather data and also predict CII numbers to help reduce fuel usage and achieve a higher CII rating. We can also advise on reducing fuel consumption to reduce emissions and gain a higher CII rating.
CII prediction example
Example of CII overview: Get an overview of your entire fleet's CII rating from year to date, including covered distance, bunker used and part of the bunker which is CII-exempt.
CII calculator
CII prediction example
Example of CII prediction: After you have inserted the speed and operational days, the calculator automatically computes the bunker consumption, and distance covered and shows the predicted CII rating. The calculator can be used to plan operations until the end of the year to reach a C rating and avoid penalties or establish a maximum speed allowed on your charter party description to avoid exceeding a C rating.

Get in touch to find out how we can help gather and predict CII numbers.