Reference Line (EEDI)

The EEDI reference line is the curve of average design CO2 efficiency against ship size that sets the required EEDI baseline for each ship type. The 2013 guidelines in resolution MEPC.231(65), adopted 17 May 2013, define it as Reference line value = a x b^(-c), where b is deadweight (or gross tonnage for some types) and a and c are type-specific constants from regression on IHS Fairplay ships of 400 GT and above delivered between 1999 and 2009. The required EEDI is this baseline minus a phase reduction factor: 10% in Phase 1, 20% in Phase 2, 30% or more in Phase 3.