It has been five years since the inclusion of chapter 4 to MARPOL Annex VI and the introduction of the International Energy Efficiency Certificate (IEE Certificate). To obtain it, every ship has to satisfy the Energy Efficiency Design Index (EEDI) requirements. It requires that for every new ship the Attained EEDI has to be calculated and not higher than the Required EEDI calculated as a function of capacity. For most ship types the deadweight (DWT) proved to be appropriate measure of capacity, but not for ro-ro passenger ships. The capacity for these ships can be defined by several parameters besides DWT, like: GT, lane meters, number of cabins, number of passengers etc. All these parameters indicate primarily the volume the ship can transport, and not the mass. But two years ago, the EEDI was modified in order to include the ro-ro passenger ships. Even though many studies concluded that the DWT was not appropriate measure of capacity for ro-ro passenger ships, the definition of the Required EEDI based on the DWT was still adopted. Also two new correction factors fjRoRo and fcRoPax were included in the calculation of the Attained EEDI. Their role was to ensure at least some level of statistical correlation when applying the EEDI for the current ro-ro passenger ships fleet. Even though the current approach has some limited statistical correlation, it does not evaluate fairly ships capacity. In this paper the current ro-ro passenger ships fleet is analyzed and a new approach is proposed in which the capacity is defined in GT. This would then allow a fair comparison between different ro-ro passenger ships.

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