Annex - 2022 Guidelines on the Reference Lines for Use with Operational Carbon Intensity Indicators (CII Reference Lines Guidelines, G2)
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Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.353(78) - 2022 Guidelines on the Reference Lines for Use with Operational Carbon Intensity Indicators (CII Reference Lines Guidelines, G2) - (adopted on 10 June 2022) - Annex - 2022 Guidelines on the Reference Lines for Use with Operational Carbon Intensity Indicators (CII Reference Lines Guidelines, G2)

Annex - 2022 Guidelines on the Reference Lines for Use with Operational Carbon Intensity Indicators (CII Reference Lines Guidelines, G2)

 1 Introduction

1.1 These Guidelines provide the methods to calculate the reference lines for use with operational carbon intensity indicators, and the ship type specific carbon intensity reference lines as referred to in regulation 28 of MARPOL Annex VI.

1.2 One reference line is developed for each ship type to which regulation 28 of MARPOL Annex VI applies, based on the specific indicators stipulated in 2022 Guidelines on operational carbon intensity indicators and the calculation methods (G1) developed by the Organization, ensuring that only data from comparable ships are included in the calculation of each reference line.

 2 Definition

2.1 MARPOL means the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocols of 1978 and 1997 relating thereto, as amended.

2.2 IMO DCS means the data collection system for fuel oil consumption of ships referred to in regulation 27 and related provisions of MARPOL Annex VI.

2.3 For the purpose of these Guidelines, the definitions in MARPOL Annex VI, as amended, apply.

2.4 An operational carbon intensity indicator (CII) reference line is defined as a curve representing the median attained operational carbon intensity performance, as a function of Capacity, of a defined group of ships in year of 2019.

 3 Method to develop the CII reference lines

3.1 Given the limited data available for the year of 2008, the operational carbon intensity performance of ship types in year 2019 is taken as the reference.

3.2 For a defined group of ships, the reference line is formulated as follows:

  • CIIref = aCapacity-c (1)

where CIIref is the reference value of year 2019, Capacity is identical with the one defined in the specific carbon intensity indicator (CII) for a ship type, as shown in Table. 1; a and c are parameters estimated through median regression fits, taking the attained CII and the Capacity of individual ships collected through IMO DCS in year 2019 as the sample.

 4 Ship type specific operational carbon intensity reference lines

The parameters for determining the ship type specific reference lines, for use in Eq.(1), are specified as follows:

Table 1: Parameters for determining the 2019 ship type specific reference lines

Ship type Capacity a c
Bulk carrier 279,000 DWT and above 279,000 4745 0.622
less than 279,000 DWT DWT 4745 0.622
Gas carrier 65,000 and above DWT 14405E7 2.071
less than 65,000 DWT DWT 8104 0.639
Tanker DWT 5247 0.610
Container ship DWT 1984 0.489
General cargo ship 20,000 DWT and above DWT 31948 0.792
less than 20,000 DWT DWT 588 0.3885
Refrigerated cargo carrier DWT 4600 0.557
Combination carrier DWT 5119 0.622
LNG carrier 100,000 DWT and above DWT 9.827 0.000
65,000 DWT and above, but less than 100,000 DWT DWT 144779E10 2.673
less than 65,000 DWT 65,000 14479E10 2.673
Ro-ro cargo ship (vehicle carrier) 57,700 GT and above 57,700 3672 0.590
30,000 GT and above, but less than 57,700 GT GT 3672 0.590
Less than 30,000 GT GT 330 0.329
Ro-ro cargo ship GT 1967 0.485
Ro-ro passenger ship Ro-ro passenger ship GT 2023 0.460
High-speed craft designed to SOLAS chapter X GT 4196 0.460
Cruise passenger ship GT 930 0.383

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