AER and Cii – what can be done? The Carbon Intensity Indicator, Cii, is an operational index based on another measure, the Annual Efficiency Ratio, AER. For an existing vessel there are several powerful ways to reduce the Cii and stay compliant within rating A-B-C.
• Reduce speed • Voyage optimisation • Technical measures
Alternative fuel will reduce CO2 factor
Source: DNV
Source: DNV
Reduced idle time improves Cii
Jumboising vessel to increase DWTCAP will improve Cii
Year
Reduction from 2019 ref. (mid-point of C-rating)
2023
5%
2024
7%
2025
9%
2026
11 %
2027-2030
To be decided Source: DNV
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