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 |
|---|---|---|---|---|---|
| 1401 |
WILSON PORTO
IMO 9291717
|
4,933 | 2004 |
15.3
|
C |
| 1402 |
NORDWIND
IMO 9013000
|
3,250 | 1991 |
15.3
|
C |
| 1403 |
WAALDIJK
IMO 9514937
|
4,891 | 2010 |
15.4
|
C |
| 1404 |
NIKITI II
IMO 9197064
|
7,301 | 1998 |
15.4
|
C |
| 1405 |
WILSON TEES
IMO 9150535
|
3,863 | 1997 |
15.4
|
C |
| 1406 |
FRI TIDE
IMO 9195676
|
3,649 | 2000 |
15.4
|
C |
| 1407 |
SAHIN 4
IMO 8913318
|
4,263 | 1993 |
15.4
|
C |
| 1408 |
BORE WAVE
IMO 9892896
|
6,747 | 2022 |
15.4
|
C |
| 1409 |
WILSON NARVIK
IMO 9430961
|
8,724 | 2011 |
15.4
|
C |
| 1410 |
CL FLANDERS
IMO 9969455
|
3,614 | 2024 |
15.4
|
C |
| 1411 |
SOPHIA
IMO 9467017
|
12,591 | 2011 |
15.4
|
C |
| 1412 |
RIX MELODY
IMO 9142631
|
5,390 | 1997 |
15.4
|
C |
| 1413 |
BOHWA PIONEER
IMO 9565869
|
8,767 | 2010 |
15.4
|
C |
| 1414 |
ANKA SUN
IMO 9114701
|
4,216 | 1994 |
15.4
|
C |
| 1415 |
KETHI
IMO 9263552
|
8,370 | 2002 |
15.4
|
C |
| 1416 |
GERMANICA HAV
IMO 8324672
|
2,291 | 1984 |
15.4
|
C |
| 1417 |
ARNE
IMO 9142564
|
9,678 | 1998 |
15.4
|
C |
| 1418 |
KRISTIN C
IMO 9523938
|
6,799 | 2010 |
15.4
|
C |
| 1419 |
KAPTAN ERDOGAN
IMO 9326043
|
4,359 | 2004 |
15.4
|
C |
| 1420 |
FLORIJNGRACHT
IMO 9428413
|
12,200 | 2010 |
15.4
|
C |
| 1421 |
SOFULAR 1
IMO 9540601
|
4,429 | 2011 |
15.4
|
C |
| 1422 |
PRIMA QUEEN
IMO 9194282
|
3,697 | 2001 |
15.4
|
C |
| 1423 |
BBC ROSARIO
IMO 9337224
|
12,873 | 2007 |
15.4
|
C |
| 1424 |
LYSBRIS SEAWAYS
IMO 9144263
|
7,500 | 1999 |
15.4
|
C |
| 1425 |
VERTOM MERIDIAAN
IMO 9385881
|
8,045 | 2010 |
15.5
|
C |
| 1426 |
RIX TERRA
IMO 9100188
|
4,775 | 1996 |
15.5
|
C |
| 1427 |
CELTIC MARINER
IMO 9377925
|
4,927 | 2010 |
15.5
|
C |
| 1428 |
KILLU
IMO 9454826
|
6,644 | 2009 |
15.5
|
C |
| 1429 |
COE ANNA
IMO 9366160
|
9,231 | 2012 |
15.5
|
C |
| 1430 |
OLIVIA
IMO 9957402
|
7,896 | 2024 |
15.5
|
C |
| 1431 |
KVITSAND
IMO 9313797
|
6,647 | 2005 |
15.5
|
D |
| 1432 |
MISSOURIBORG
IMO 9228978
|
9,687 | 2000 |
15.5
|
D |
| 1433 |
INGRID B
IMO 9279020
|
3,680 | 2005 |
15.5
|
D |
| 1434 |
VEENDIJK
IMO 9346718
|
4,891 | 2009 |
15.5
|
D |
| 1435 |
OCEAN TRADER
IMO 9349461
|
9,705 | 2011 |
15.5
|
D |
| 1436 |
BEAUTRITON
IMO 9428669
|
7,210 | 2009 |
15.5
|
D |
| 1437 |
INDUSTRIAL SKIPPER
IMO 9741138
|
12,329 | 2016 |
15.5
|
D |
| 1438 |
LADY VIVIANA
IMO 9320518
|
11,551 | 2005 |
15.5
|
D |
| 1439 |
HADELAND
IMO 9505601
|
9,692 | 2011 |
15.5
|
D |
| 1440 |
BALTIC ARROW
IMO 9243863
|
2,985 | 2002 |
15.5
|
D |
| 1441 |
AMBER SPIRIT
IMO 9142643
|
6,089 | 1997 |
15.5
|
D |
| 1442 |
UAL BODEWES
IMO 9542336
|
8,327 | 2012 |
15.5
|
D |
| 1443 |
O7 GAJA
IMO 9273791
|
12,767 | 2006 |
15.5
|
D |
| 1444 |
AQUAMAR
IMO 9951850
|
5,422 | 2024 |
15.6
|
D |
| 1445 |
PAUWGRACHT
IMO 9448308
|
19,329 | 2010 |
15.6
|
D |
| 1446 |
FALKSEA
IMO 9250426
|
5,065 | 2002 |
15.6
|
D |
| 1447 |
WILSON STADT
IMO 8918485
|
6,445 | 2000 |
15.6
|
D |
| 1448 |
HAV GROUPER
IMO 9001837
|
3,053 | 1991 |
15.6
|
D |
| 1449 |
WILSON NEWPORT
IMO 9430985
|
8,691 | 2011 |
15.6
|
D |
| 1450 |
SEA ENDURANCE
IMO 9516179
|
9,762 | 2012 |
15.6
|
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.