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 |
|---|---|---|---|---|---|
| 1901 |
REBECCA
IMO 9195896
|
5,004 | 2001 |
18.4
|
D |
| 1902 |
CAROLIN G.
IMO 9462500
|
3,797 | 2008 |
18.4
|
D |
| 1903 |
ASG KHERSON
IMO 9255579
|
7,796 | 2002 |
18.4
|
D |
| 1904 |
INDUSTRIAL COLOR
IMO 9810355
|
8,428 | 2019 |
18.5
|
D |
| 1905 |
NYLAND
IMO 9436240
|
6,805 | 2009 |
18.5
|
D |
| 1906 |
WILSON GHENT
IMO 9150236
|
3,875 | 1996 |
18.5
|
D |
| 1907 |
BEE
IMO 9506588
|
5,424 | 2011 |
18.5
|
D |
| 1908 |
WILSON LUGA
IMO 9156187
|
2,480 | 1996 |
18.5
|
E |
| 1909 |
LAAR
IMO 8508400
|
2,304 | 1985 |
18.5
|
E |
| 1910 |
CEMAL REIS
IMO 9558995
|
7,096 | 2010 |
18.5
|
E |
| 1911 |
AYR
IMO 9313711
|
3,604 | 2009 |
18.5
|
E |
| 1912 |
SKY RANGER
IMO 9138769
|
3,419 | 1997 |
18.5
|
E |
| 1913 |
EEMS EXE
IMO 9195535
|
3,725 | 2003 |
18.5
|
E |
| 1914 |
VERENA
IMO 9387322
|
3,794 | 2009 |
18.5
|
E |
| 1915 |
ANNA
IMO 9040962
|
2,481 | 1994 |
18.5
|
E |
| 1916 |
KARESSA
IMO 9341770
|
4,878 | 2006 |
18.5
|
E |
| 1917 |
MARY
IMO 9187978
|
2,418 | 1998 |
18.5
|
E |
| 1918 |
PGE LILY
IMO 9013024
|
1,820 | 1991 |
18.5
|
E |
| 1919 |
PIJLGRACHT
IMO 9448358
|
19,379 | 2011 |
18.6
|
E |
| 1920 |
BBC KIMBERLEY
IMO 9407586
|
10,323 | 2009 |
18.6
|
E |
| 1921 |
SIDER MONICA
IMO 9432517
|
8,520 | 2009 |
18.6
|
E |
| 1922 |
LETTLAND
IMO 9237022
|
5,464 | 2001 |
18.6
|
E |
| 1923 |
BALTIC MADONNA
IMO 9100138
|
3,895 | 1994 |
18.6
|
E |
| 1924 |
WILSON HOBRO
IMO 9229128
|
4,338 | 2001 |
18.6
|
E |
| 1925 |
HAAFJELL
IMO 9148207
|
3,714 | 1999 |
18.6
|
E |
| 1926 |
WILSON MAIN
IMO 8913485
|
2,561 | 1990 |
18.6
|
E |
| 1927 |
MARTEN
IMO 9617337
|
3,801 | 2012 |
18.6
|
E |
| 1928 |
EDZARD CIRKSENA
IMO 9375824
|
3,631 | 2008 |
18.6
|
E |
| 1929 |
LEVI
IMO 9570620
|
7,984 | 2010 |
18.6
|
E |
| 1930 |
VERTOM KARIANNE
IMO 9313759
|
3,597 | 2010 |
18.6
|
E |
| 1931 |
OGUZ SOFUOGLU
IMO 9424259
|
4,250 | 2008 |
18.6
|
E |
| 1932 |
WILSON AVILES
IMO 9313709
|
3,597 | 2008 |
18.6
|
E |
| 1933 |
FEMBRIA
IMO 9350771
|
7,064 | 2006 |
18.7
|
E |
| 1934 |
LOTTALAND
IMO 9155975
|
3,980 | 1997 |
18.7
|
E |
| 1935 |
BLUE NOTE
IMO 9491915
|
5,203 | 2010 |
18.7
|
E |
| 1936 |
RIX PARTNER
IMO 9195212
|
3,723 | 1998 |
18.7
|
E |
| 1937 |
DAY BLUE
IMO 9184811
|
4,705 | 1998 |
18.7
|
E |
| 1938 |
M.N.EREGLI
IMO 9057317
|
3,030 | 1996 |
18.7
|
E |
| 1939 |
WILSON DIRDAL
IMO 9409637
|
3,785 | 2010 |
18.7
|
E |
| 1940 |
ZEUS
IMO 9199684
|
2,500 | 2000 |
18.7
|
E |
| 1941 |
BBC BELEM
IMO 9501655
|
8,129 | 2012 |
18.7
|
E |
| 1942 |
ROSI
IMO 9517238
|
3,850 | 2010 |
18.7
|
E |
| 1943 |
EEMS BISON
IMO 9981180
|
4,100 | 2024 |
18.7
|
E |
| 1944 |
HAPPY SKY
IMO 9457220
|
17,683 | 2013 |
18.7
|
E |
| 1945 |
WILSON HORTEN
IMO 9119579
|
4,270 | 1998 |
18.7
|
E |
| 1946 |
ROIBEIRA
IMO 9414187
|
7,781 | 2007 |
18.7
|
E |
| 1947 |
CLI PRIDE
IMO 9513646
|
7,822 | 2011 |
18.8
|
E |
| 1948 |
WILSON GDYNIA
IMO 9056064
|
3,632 | 1994 |
18.8
|
E |
| 1949 |
CORNION
IMO 9360491
|
4,933 | 2008 |
18.8
|
E |
| 1950 |
WILSON CADIZ
IMO 9192612
|
4,432 | 2000 |
18.8
|
E |
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.