Most Emission-Efficient General 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 |
|---|---|---|---|---|---|
| 1501 |
PUKA
IMO 9374973
|
12,016 | 2007 |
15.8
|
D |
| 1502 |
VICTORIA
IMO 9523926
|
8,546 | 2010 |
15.8
|
D |
| 1503 |
COE MINA
IMO 8509820
|
3,357 | 1985 |
15.8
|
D |
| 1504 |
SEA DISCOVERY
IMO 9516131
|
9,732 | 2012 |
15.8
|
D |
| 1505 |
BRUFJELL
IMO 9346665
|
4,891 | 2007 |
15.8
|
D |
| 1506 |
ASTRID ERIKA
IMO 9291731
|
4,933 | 2005 |
15.8
|
D |
| 1507 |
OCEAN CARRIER
IMO 9349435
|
9,653 | 2010 |
15.8
|
D |
| 1508 |
CDRY BROWN
IMO 9469302
|
8,537 | 2010 |
15.8
|
D |
| 1509 |
SEABEE
IMO 8909185
|
3,502 | 1990 |
15.8
|
D |
| 1510 |
GUNDEM MAKBULE
IMO 9520388
|
4,697 | 2009 |
15.9
|
D |
| 1511 |
DONGEBORG
IMO 9163697
|
8,832 | 1999 |
15.9
|
D |
| 1512 |
PROTEAS II
IMO 9212620
|
6,687 | 1999 |
15.9
|
D |
| 1513 |
WILSON PARNU
IMO 9373541
|
4,933 | 2008 |
15.9
|
D |
| 1514 |
BLUES
IMO 8901030
|
3,806 | 1990 |
15.9
|
D |
| 1515 |
WILSON NANJING
IMO 9431018
|
8,703 | 2012 |
15.9
|
D |
| 1516 |
MANISA SILVANA
IMO 9306316
|
8,515 | 2006 |
15.9
|
D |
| 1517 |
FAHRIYE K
IMO 9387126
|
4,581 | 2007 |
15.9
|
D |
| 1518 |
FAMITA
IMO 9250438
|
5,215 | 2002 |
15.9
|
D |
| 1519 |
KAIRIIN
IMO 9534250
|
6,738 | 2009 |
15.9
|
D |
| 1520 |
SIMON B
IMO 8511029
|
2,380 | 1986 |
15.9
|
D |
| 1521 |
BBC ONYX
IMO 9506746
|
14,359 | 2011 |
15.9
|
D |
| 1522 |
SIRIUS
IMO 9846469
|
6,705 | 2021 |
15.9
|
D |
| 1523 |
VERTOM JOSE
IMO 9556313
|
5,500 | 2013 |
15.9
|
D |
| 1524 |
FRISIAN SUMMER
IMO 9367762
|
6,582 | 2008 |
15.9
|
D |
| 1525 |
WILSON HAWK
IMO 9064906
|
4,284 | 1994 |
15.9
|
D |
| 1526 |
OMER SOFUOGLU
IMO 9389344
|
4,408 | 2007 |
15.9
|
D |
| 1527 |
SIDER UNICORN
IMO 9861548
|
7,588 | 2023 |
15.9
|
D |
| 1528 |
GUNDEM AZRA
IMO 9352183
|
4,964 | 2007 |
15.9
|
D |
| 1529 |
ESTEMAR
IMO 9552068
|
5,235 | 2011 |
15.9
|
D |
| 1530 |
MARSGRACHT
IMO 9571507
|
12,263 | 2011 |
15.9
|
D |
| 1531 |
WILSON NORFOLK
IMO 9430997
|
8,683 | 2011 |
15.9
|
D |
| 1532 |
FEED FISKAA
IMO 9115999
|
4,670 | 1995 |
15.9
|
D |
| 1533 |
UMS-ALBEDO
IMO 9217163
|
10,629 | 2002 |
15.9
|
D |
| 1534 |
DIJKSGRACHT
IMO 9420772
|
17,381 | 2008 |
15.9
|
D |
| 1535 |
LAKER 1
IMO 9453614
|
7,224 | 2009 |
16.0
|
D |
| 1536 |
ROMAN E
IMO 9083134
|
5,158 | 1995 |
16.0
|
D |
| 1537 |
ZELIHA K
IMO 9395185
|
4,986 | 2007 |
16.0
|
D |
| 1538 |
TIMBER NAVIGATOR
IMO 9532824
|
8,289 | 2011 |
16.0
|
D |
| 1539 |
FRI W
IMO 8915627
|
3,283 | 1990 |
16.0
|
D |
| 1540 |
LECKO
IMO 9263576
|
4,822 | 2003 |
16.0
|
D |
| 1541 |
AMIR JOY
IMO 9205706
|
9,791 | 2000 |
16.0
|
D |
| 1542 |
RUNA
IMO 9361328
|
6,665 | 2007 |
16.0
|
D |
| 1543 |
MONIKA
IMO 9815317
|
4,938 | 2018 |
16.0
|
D |
| 1544 |
RUDOLF
IMO 9535591
|
10,872 | 2010 |
16.0
|
D |
| 1545 |
KAJA
IMO 9130200
|
4,665 | 1997 |
16.0
|
D |
| 1546 |
CLARA
IMO 9312676
|
5,744 | 2004 |
16.0
|
D |
| 1547 |
WILSON NANTES
IMO 9430973
|
8,709 | 2011 |
16.0
|
D |
| 1548 |
BBC SAPPHIRE
IMO 9504798
|
14,356 | 2012 |
16.0
|
D |
| 1549 |
CELTICA HAV
IMO 8422022
|
2,304 | 1984 |
16.1
|
D |
| 1550 |
SCOT LEADER
IMO 9963267
|
4,794 | 2024 |
16.1
|
D |
Which engines power the greenest fleets?
The main engine is the single largest CO₂ source on board — typically well over 80% of a ship's emissions come from propulsion. We aggregated this ranking the other way around: every engine design is scored by the measured carbon intensity of the vessels carrying it, licensee-built units merged under their design brand. The verdict from the 2025 data — modern dual-fuel designs like MAN B&W's ME-GI and WinGD's X-DF families, together with EGR/SCR-abated and ultra-long-stroke G-type engines, consistently power the most emission-friendly ships in service.
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.