Most Emission-Efficient Ro-Ro Cargos
Ships ranked by AER (Annual Efficiency Ratio) — grams of CO₂ emitted per tonne of deadweight carried one nautical mile (g CO₂/dwt·nm), the IMO carbon-intensity metric behind the CII rating — from official EU MRV emissions data for reporting year 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 1 |
ENDURANCE
IMO 9121273
|
48,988 | 1996 |
7.6
|
A |
| 2 |
JASMINE LEADER
IMO 9925368
|
19,359 | 2023 |
12.7
|
A |
| 3 |
BLUE HERITAGE
IMO 9968619
|
19,025 | 2024 |
13.1
|
A |
| 4 |
TREASURE
IMO 9184859
|
22,173 | 1999 |
13.5
|
A |
| 5 |
SIXTINE
IMO 9831165
|
20,615 | 2019 |
14.0
|
A |
| 6 |
LAURELINE
IMO 9823352
|
20,615 | 2019 |
14.0
|
A |
| 7 |
ANJI ANSHENG
IMO 1021386
|
24,663 | 2025 |
14.1
|
A |
| 8 |
BYD ZHENGZHOU
IMO 9999577
|
19,080 | 2025 |
14.2
|
A |
| 9 |
DONG-A METIS
IMO 9419747
|
22,582 | 2010 |
14.3
|
A |
| 10 |
HERMINE
IMO 9831177
|
20,615 | 2019 |
14.3
|
A |
| 11 |
FAUSTINE
IMO 9889708
|
20,194 | 2021 |
14.6
|
A |
| 12 |
YSALINE
IMO 9823364
|
20,615 | 2019 |
14.8
|
A |
| 13 |
DONG-A GLAUCOS
IMO 9441867
|
26,985 | 2011 |
15.4
|
A |
| 14 |
SERAPHINE
IMO 9889710
|
20,092 | 2022 |
15.4
|
A |
| 15 |
SAFFET BEY
IMO 8417118
|
14,107 | 1987 |
15.4
|
A |
| 16 |
CHAUMINE
IMO 9963566
|
25,595 | 2025 |
15.7
|
A |
| 17 |
JISU FORTUNE
IMO 9981570
|
19,160 | 2025 |
15.8
|
A |
| 18 |
ULUSOY-5
IMO 8501464
|
14,103 | 1987 |
15.8
|
A |
| 19 |
YOUNG SHIN
IMO 9021332
|
14,274 | 1992 |
15.9
|
A |
| 20 |
BYD HEFEI
IMO 9999565
|
19,119 | 2025 |
16.3
|
A |
| 21 |
BOTNIA ENABLER
IMO 9884679
|
24,600 | 2022 |
16.7
|
A |
| 22 |
LEONINE
IMO 9963578
|
25,460 | 2025 |
16.8
|
A |
| 23 |
BALTIC ENABLER
IMO 9884681
|
24,600 | 2022 |
17.1
|
A |
| 24 |
CELINE
IMO 9789233
|
27,687 | 2017 |
17.7
|
A |
| 25 |
DELPHINE
IMO 9789245
|
27,687 | 2018 |
17.8
|
A |
| 26 |
ORANJEBORG
IMO 9232797
|
15,126 | 2004 |
18.0
|
A |
| 27 |
LYKTOS
IMO 8401145
|
9,200 | 1986 |
18.1
|
A |
| 28 |
ARK FUTURA
IMO 9129598
|
13,500 | 1996 |
18.2
|
A |
| 29 |
SOMERSET
IMO 9188221
|
12,500 | 1999 |
19.7
|
A |
| 30 |
SCA ORTVIKEN
IMO 9087374
|
11,521 | 1996 |
20.2
|
A |
| 31 |
BELGIA SEAWAYS
IMO 9188233
|
12,082 | 2000 |
20.4
|
A |
| 32 |
TRANS CARRIER
IMO 9007879
|
7,193 | 1992 |
20.4
|
A |
| 33 |
NEOLINER ORIGIN
IMO 1021829
|
6,598 | 2025 |
20.6
|
A |
| 34 |
SC CONNECTOR
IMO 9131993
|
8,843 | 1997 |
20.9
|
A |
| 35 |
PALATINE
IMO 9376701
|
14,565 | 2009 |
21.0
|
A |
| 36 |
SCA OSTRAND
IMO 9087362
|
11,561 | 1996 |
21.0
|
A |
| 37 |
VASSILIOS
IMO 8813154
|
13,772 | 1990 |
21.2
|
A |
| 38 |
PEREGRINE
IMO 9376725
|
14,538 | 2010 |
21.3
|
A |
| 39 |
SCA OBBOLA
IMO 9087350
|
11,446 | 1996 |
21.3
|
A |
| 40 |
VESPERTINE
IMO 9376713
|
14,483 | 2010 |
21.6
|
A |
| 41 |
MERNA 2
IMO 9165310
|
13,179 | 1998 |
21.8
|
A |
| 42 |
SOUTH ENABLER
IMO 1022641
|
13,726 | 2025 |
22.0
|
A |
| 43 |
MOSEL ACE
IMO 9177052
|
12,761 | 2000 |
22.1
|
A |
| 44 |
ULUSOY-15
IMO 9506265
|
13,231 | 2013 |
22.5
|
A |
| 45 |
EPHESUS SEAWAYS
IMO 9816830
|
17,011 | 2019 |
22.8
|
B |
| 46 |
BALTIC BRIGHT
IMO 9129263
|
6,302 | 1995 |
22.8
|
B |
| 47 |
MAZARINE
IMO 9376696
|
14,552 | 2009 |
22.9
|
B |
| 48 |
CATHERINE
IMO 9209453
|
13,320 | 2002 |
23.0
|
B |
| 49 |
ECO SALERNO
IMO 9985538
|
18,098 | 2025 |
23.1
|
B |
| 50 |
SAMSKIP KVITBJØRN
IMO 9642564
|
4,900 | 2015 |
23.1
|
B |
AER (Annual Efficiency Ratio) = annual CO₂ emissions ÷ (deadweight × distance sailed), the IMO carbon-intensity metric used for CII ratings. It is built only from measured CO₂, distance and deadweight — not the self-reported cargo transport-work figure, which is unreliable. Implausible outliers (top 2% per segment) are excluded. Grade A–E reflects each vessel's rank within its segment. Source: EMSA THETIS-MRV.