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Carbon Intensity Indicator (CII) – (simplified version)
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Engr. Shafiul Bari
Shafiul Bari is a seasoned Marine Engineer with extensive experience in ship design, maintenance, and marine propulsion systems. With a deep technical knowledge of ship engineering and a passion for advancing maritime technology, Shafiul shares practical insights and expert advice to help marine professionals and enthusiasts better understand the complexities of ship systems. Through his website, he aims to bridge the gap between technical theory and real-world application, fostering a community of informed and skilled maritime engineers.
When not immersed in ship engines and technical manuals, Shafiul enjoys exploring the latest innovations in marine technology and mentoring aspiring marine engineers.
View Author Profile →CII is an operational efficiency indicator that measures a vessel’s carbon intensity over time. It regulates the real-life CO2 emissions from ships and applies to cargo, RoPax, and cruise vessels above 5,000 GT trading internationally from January 1, 2023[1].
Key Features
- Measures CO2 emissions in grams per cargo-carrying capacity and nautical mile
- Annual reporting based on actual fuel consumption
- Ships receive an annual rating from A (best) to E (worst)
- Rating thresholds become increasingly stringent towards 2030
CII Calculation
The formula for CII is:
CII = CO2 Emission / (Dead weight × Distance Sailed)
CII Ratings
| Rating | Performance Level |
| A | Major superior |
| B | Minor superior |
| C | Moderate |
| D | Minor inferior |
| E | Inferior |
Note: C rating is the minimum acceptable rating[1].
Methods to Improve CII Rating
Improvement Methods
- Slow steaming
- Using slide type fuel valves
- Implementing eco nozzles
- Engine derating
- Low load optimization tuning
Deterioration Suppression Methods
- Chief load limiter
- Auto speed reduction in rough seas
- Auto engine load control
- Adaptive sea condition control governor
- PMI auto tuning
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