Abstract
The new carbon intensity indicator (CII) is an operational tool that is part of SEEMP III and came into force on 1 January 2023. It is a measure of a vessel’s efficiency in CO2 emitted per deadweight nautical mile and is aimed at supporting the decarbonization of maritime transportation. There are studies indicating that no matter which CII option is applied, the overall CO2 emissions can increase, and maybe the proposal of a new CII is required. It has been suggested that an average CII could be calculated for an entire company rather than for each individual ship. This case study analyzed the 1-year calendar routes of four vessels (one container carrier, two bulk carriers, and one tanker vessel); the CII results were evaluated, and further operational measures were applied to improve the CII rating. It was observed that CII is highly dependent on idle and laden voyages, and very good cooperation between shipowners and charterers is a must. The anchor/drifting and port times must be reduced to the minimum, and vessels’ schedules should be adjusted for just-in-time arrival to optimize the speed between ports. That requires the voyage planning to be evaluated and adjusted based on port operations.
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