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 |
|---|---|---|---|---|---|
| 2151 |
WILSON TWISTEDEN
IMO 9195468
|
2,655 | 2002 |
21.2
|
E |
| 2152 |
GULF RAIN
IMO 9056052
|
3,560 | 1993 |
21.2
|
E |
| 2153 |
ELEONORA
IMO 9393785
|
6,627 | 2011 |
21.3
|
E |
| 2154 |
CS CIHAN
IMO 9045704
|
7,068 | 2007 |
21.3
|
E |
| 2155 |
FREDO
IMO 8504208
|
1,631 | 1985 |
21.3
|
E |
| 2156 |
SARDES
IMO 9374387
|
6,424 | 2006 |
21.5
|
E |
| 2157 |
GT AURIGA
IMO 9041318
|
3,602 | 1993 |
21.5
|
E |
| 2158 |
INDUSTRIAL DIAMOND
IMO 9347827
|
7,968 | 2006 |
21.5
|
E |
| 2159 |
BALTIC MERCHANT
IMO 9138202
|
3,110 | 1997 |
21.5
|
E |
| 2160 |
BEAUMAIDEN
IMO 9401257
|
3,800 | 2008 |
21.5
|
E |
| 2161 |
CEG ORBIT
IMO 9113599
|
2,300 | 1995 |
21.6
|
E |
| 2162 |
BALTIC SAILOR
IMO 9138214
|
3,110 | 1998 |
21.6
|
E |
| 2163 |
HAV NORDIC
IMO 8719085
|
3,013 | 1990 |
21.6
|
E |
| 2164 |
KLAUSEN
IMO 9111553
|
2,044 | 1995 |
21.6
|
E |
| 2165 |
HAV ATLANTIC
IMO 9129122
|
4,545 | 1996 |
21.6
|
E |
| 2166 |
DREAMLAND
IMO 9155872
|
4,123 | 1997 |
21.7
|
E |
| 2167 |
AGUIMES
IMO 8820107
|
4,924 | 1989 |
21.7
|
E |
| 2168 |
DREAM S
IMO 9199385
|
4,135 | 2000 |
21.7
|
E |
| 2169 |
HAV SAND
IMO 9505326
|
3,108 | 2011 |
21.7
|
E |
| 2170 |
DELIA
IMO 9234317
|
2,437 | 2000 |
21.7
|
E |
| 2171 |
CL ATLAS
IMO 9357511
|
5,800 | 2008 |
21.7
|
E |
| 2172 |
STRAUMFRAKT
IMO 7716490
|
1,519 | 1979 |
21.8
|
E |
| 2173 |
BALTIC SKIPPER
IMO 9138185
|
3,110 | 1997 |
21.8
|
E |
| 2174 |
KASSEL
IMO 9191266
|
4,442 | 1998 |
21.8
|
E |
| 2175 |
WILSON RUHR
IMO 9145542
|
1,831 | 1997 |
21.8
|
E |
| 2176 |
ENES D
IMO 9100152
|
4,182 | 1994 |
21.8
|
E |
| 2177 |
ALEXANDRA S
IMO 9198642
|
4,247 | 2002 |
21.9
|
E |
| 2178 |
VULIN
IMO 9015448
|
2,372 | 1993 |
21.9
|
E |
| 2179 |
FREDERIK
IMO 9518402
|
4,508 | 2009 |
21.9
|
E |
| 2180 |
GT CETUS
IMO 9278349
|
3,796 | 2004 |
21.9
|
E |
| 2181 |
GT DELPHIN
IMO 9401245
|
3,800 | 2008 |
21.9
|
E |
| 2182 |
VARDEFJELL
IMO 9197806
|
3,171 | 2000 |
21.9
|
E |
| 2183 |
SONILAND
IMO 9155949
|
4,085 | 1997 |
21.9
|
E |
| 2184 |
WILSON WESER
IMO 9198446
|
2,500 | 2005 |
21.9
|
E |
| 2185 |
WILSON CLYDE
IMO 9178458
|
4,438 | 1998 |
22.0
|
E |
| 2186 |
BBC RUSHMORE
IMO 9508469
|
9,356 | 2012 |
22.0
|
E |
| 2187 |
FAST SIM
IMO 9356517
|
3,609 | 2008 |
22.0
|
E |
| 2188 |
SEA CHARENTE
IMO 9155676
|
2,100 | 1996 |
22.1
|
E |
| 2189 |
GT VELA
IMO 8912027
|
3,269 | 1991 |
22.1
|
E |
| 2190 |
KURLAND
IMO 9226803
|
5,075 | 2002 |
22.1
|
E |
| 2191 |
NORDLAND
IMO 9281786
|
4,525 | 2003 |
22.1
|
E |
| 2192 |
BIGLIFT BARENTSZ
IMO 9710464
|
20,098 | 2016 |
22.1
|
E |
| 2193 |
WELL PRIME
IMO 9243928
|
3,578 | 2002 |
22.1
|
E |
| 2194 |
BBC AUSTRIA
IMO 9433327
|
7,741 | 2009 |
22.1
|
E |
| 2195 |
WILSON MERSEY
IMO 9177868
|
2,460 | 1999 |
22.1
|
E |
| 2196 |
BESTEKAR
IMO 9363508
|
6,399 | 2006 |
22.1
|
E |
| 2197 |
LISTERVIK
IMO 9136216
|
3,904 | 1996 |
22.1
|
E |
| 2198 |
TIMBUS
IMO 9198680
|
6,238 | 1999 |
22.2
|
E |
| 2199 |
FRI BREVIK
IMO 9190183
|
3,780 | 2001 |
22.2
|
E |
| 2200 |
PAIVI
IMO 9434149
|
3,450 | 2008 |
22.2
|
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.