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 |
|---|---|---|---|---|---|
| 1551 |
HAPPY RANGER
IMO 9139311
|
15,443 | 1998 |
16.1
|
D |
| 1552 |
HERMAS
IMO 9224166
|
4,903 | 2000 |
16.1
|
D |
| 1553 |
WILSON NORTH
IMO 9430947
|
8,691 | 2010 |
16.1
|
D |
| 1554 |
GULF
IMO 8937352
|
4,325 | 2000 |
16.1
|
D |
| 1555 |
WILSON BRUGGE
IMO 9150494
|
3,866 | 1996 |
16.1
|
D |
| 1556 |
WILSON BILBAO
IMO 9014705
|
3,944 | 1992 |
16.1
|
D |
| 1557 |
KERLI
IMO 9125695
|
4,666 | 1997 |
16.1
|
D |
| 1558 |
HARUN
IMO 9361380
|
6,665 | 2008 |
16.1
|
D |
| 1559 |
SWEDICA HAV
IMO 8605478
|
2,279 | 1986 |
16.1
|
D |
| 1560 |
MOHAMAD
IMO 8919960
|
7,900 | 1990 |
16.1
|
D |
| 1561 |
DANICA HAV
IMO 8401535
|
2,298 | 1984 |
16.1
|
D |
| 1562 |
SALAR
IMO 8801125
|
3,432 | 1989 |
16.1
|
D |
| 1563 |
KRISTELLA
IMO 9187928
|
7,120 | 2000 |
16.1
|
D |
| 1564 |
KATRIN
IMO 9155987
|
5,014 | 1996 |
16.1
|
D |
| 1565 |
GEORGIOS ALEXIOS
IMO 9433511
|
5,241 | 2009 |
16.1
|
D |
| 1566 |
FRI LIEPAJA
IMO 9344514
|
4,933 | 2006 |
16.1
|
D |
| 1567 |
MARIETJE DEBORAH
IMO 9481594
|
8,493 | 2011 |
16.1
|
D |
| 1568 |
CDRY WHITE
IMO 9365506
|
8,537 | 2010 |
16.1
|
D |
| 1569 |
SCOT TRADER
IMO 9728784
|
4,787 | 2023 |
16.1
|
D |
| 1570 |
BLAIR MCKEIL
IMO 9546045
|
14,906 | 2010 |
16.1
|
D |
| 1571 |
OCEAN GLADIATOR
IMO 9418987
|
19,382 | 2010 |
16.1
|
D |
| 1572 |
ASIM BERK
IMO 9108427
|
3,006 | 1994 |
16.1
|
D |
| 1573 |
OPTIMA
IMO 9210244
|
9,022 | 2000 |
16.1
|
D |
| 1574 |
FRI GDANSK
IMO 9344502
|
4,933 | 2006 |
16.2
|
D |
| 1575 |
ARTVIN
IMO 8917869
|
2,644 | 1990 |
16.2
|
D |
| 1576 |
SIDER IBIZA
IMO 9861524
|
7,585 | 2020 |
16.2
|
D |
| 1577 |
EZMOCE
IMO 9124873
|
3,660 | 1996 |
16.2
|
D |
| 1578 |
VENTUMAR
IMO 9956288
|
5,399 | 2025 |
16.2
|
D |
| 1579 |
ZOYA S
IMO 1064821
|
8,307 | 2025 |
16.2
|
D |
| 1580 |
BRIZA
IMO 9286815
|
6,917 | 2003 |
16.2
|
D |
| 1581 |
RUBYLAND
IMO 9518995
|
5,724 | 2011 |
16.2
|
D |
| 1582 |
PRINSENGRACHT
IMO 9448372
|
19,866 | 2011 |
16.2
|
D |
| 1583 |
EMS LION
IMO 9978901
|
4,400 | 2023 |
16.2
|
D |
| 1584 |
AVONBORG
IMO 9466362
|
17,294 | 2012 |
16.2
|
D |
| 1585 |
CDRY BLACK
IMO 9504633
|
8,537 | 2011 |
16.2
|
D |
| 1586 |
HAV BRIM
IMO 9361756
|
4,748 | 2008 |
16.2
|
D |
| 1587 |
MORGENSTOND II
IMO 9367073
|
12,102 | 2007 |
16.2
|
D |
| 1588 |
JOY X
IMO 9428774
|
7,800 | 2007 |
16.2
|
D |
| 1589 |
NASSAUBORG
IMO 9248564
|
20,530 | 2006 |
16.2
|
D |
| 1590 |
WILSON PLYMOUTH
IMO 9344497
|
4,960 | 2006 |
16.3
|
D |
| 1591 |
EBRU
IMO 9235490
|
8,961 | 2000 |
16.3
|
D |
| 1592 |
DENIZ STAR
IMO 1071472
|
8,290 | 2025 |
16.3
|
D |
| 1593 |
RECEP KURU
IMO 9040948
|
5,048 | 1994 |
16.3
|
D |
| 1594 |
AYA
IMO 9516557
|
6,840 | 2008 |
16.3
|
D |
| 1595 |
AMBASSADOR S
IMO 9006370
|
3,713 | 1994 |
16.3
|
D |
| 1596 |
RIX DELTA
IMO 9195767
|
3,850 | 2003 |
16.3
|
D |
| 1597 |
RIX VENTURE
IMO 9238399
|
4,933 | 2002 |
16.3
|
D |
| 1598 |
AHMET AGAOGLU
IMO 9082001
|
4,304 | 1994 |
16.3
|
D |
| 1599 |
KJERVAAGSUND
IMO 9312690
|
5,780 | 2005 |
16.3
|
D |
| 1600 |
DONA BLE
IMO 9142540
|
9,221 | 1997 |
16.3
|
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.