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 |
|---|---|---|---|---|---|
| 1201 |
TORONEOS
IMO 9237400
|
7,568 | 2000 |
14.4
|
C |
| 1202 |
ANNAMARIA
IMO 9488633
|
8,091 | 2008 |
14.4
|
C |
| 1203 |
KERSTI
IMO 9342138
|
5,907 | 2006 |
14.4
|
C |
| 1204 |
RISE 1905
IMO 9380855
|
3,385 | 2006 |
14.4
|
C |
| 1205 |
TRITO NAVIGATOR
IMO 9631357
|
8,137 | 2013 |
14.4
|
C |
| 1206 |
ROZ Y
IMO 9499931
|
8,811 | 2008 |
14.4
|
C |
| 1207 |
UKPIK
IMO 9468114
|
12,575 | 2011 |
14.5
|
C |
| 1208 |
KAREWOOD PRIDE
IMO 9281499
|
6,315 | 2006 |
14.5
|
C |
| 1209 |
ADRIATICBORG
IMO 9546497
|
17,294 | 2011 |
14.5
|
C |
| 1210 |
KLAVERBANK
IMO 9518244
|
5,250 | 2011 |
14.5
|
C |
| 1211 |
PROMISE
IMO 9371816
|
6,500 | 2008 |
14.5
|
C |
| 1212 |
KARILIIS
IMO 9376787
|
5,949 | 2009 |
14.5
|
C |
| 1213 |
MARIETJE ANDREA
IMO 9361134
|
8,493 | 2009 |
14.5
|
C |
| 1214 |
TOLLUND
IMO 9088287
|
4,170 | 1994 |
14.5
|
C |
| 1215 |
FEED ROGALAND
IMO 9291729
|
4,993 | 2004 |
14.5
|
C |
| 1216 |
NECATI CAVUSOGLU
IMO 9212785
|
3,171 | 1999 |
14.5
|
C |
| 1217 |
BREADBOX VIPER
IMO 9201932
|
2,948 | 2000 |
14.5
|
C |
| 1218 |
RIX STAR
IMO 9006277
|
3,710 | 1991 |
14.5
|
C |
| 1219 |
MEDEMBORG
IMO 9142514
|
9,769 | 1997 |
14.5
|
C |
| 1220 |
ECHO PETRA
IMO 1028554
|
3,777 | 2024 |
14.5
|
C |
| 1221 |
CELTIC VENTURE
IMO 9521368
|
5,640 | 2012 |
14.5
|
C |
| 1222 |
HAGLAND PROGRESS
IMO 9936343
|
4,902 | 2023 |
14.5
|
C |
| 1223 |
HAV TUNA
IMO 9084487
|
3,036 | 1993 |
14.5
|
C |
| 1224 |
AMBER STAR
IMO 9534286
|
6,050 | 2011 |
14.5
|
C |
| 1225 |
SKY TIME
IMO 9155913
|
6,324 | 1998 |
14.5
|
C |
| 1226 |
SAAREMAA
IMO 9973274
|
5,963 | 2024 |
14.6
|
C |
| 1227 |
HAGLAND PREMIER
IMO 9964077
|
4,929 | 2023 |
14.6
|
C |
| 1228 |
LURO
IMO 9263588
|
4,919 | 2003 |
14.6
|
C |
| 1229 |
SEA NAVIGATOR
IMO 8121381
|
6,446 | 1985 |
14.6
|
C |
| 1230 |
ONEGO GLOMMA
IMO 9294977
|
10,649 | 2004 |
14.6
|
C |
| 1231 |
KAROLIINA
IMO 9381380
|
8,379 | 2008 |
14.6
|
C |
| 1232 |
TONY STARK
IMO 9046423
|
15,346 | 1993 |
14.6
|
C |
| 1233 |
LOLLAND
IMO 9973262
|
5,946 | 2024 |
14.6
|
C |
| 1234 |
GREETJE
IMO 9969467
|
3,640 | 2024 |
14.6
|
C |
| 1235 |
BBC JADE
IMO 9421116
|
12,000 | 2008 |
14.6
|
C |
| 1236 |
HAV SNAPPER
IMO 9001813
|
3,007 | 1991 |
14.6
|
C |
| 1237 |
ONEGO RIO
IMO 9258985
|
10,300 | 2003 |
14.6
|
C |
| 1238 |
BALTIC EXPRESS
IMO 9243851
|
3,002 | 2001 |
14.6
|
C |
| 1239 |
TRIO DENIZHAN
IMO 8922266
|
4,220 | 1992 |
14.6
|
C |
| 1240 |
BALTIC ECLIPSE
IMO 9963011
|
3,801 | 2024 |
14.7
|
C |
| 1241 |
ARA ROTTERDAM
IMO 9549566
|
13,524 | 2012 |
14.7
|
C |
| 1242 |
FORTUNAGRACHT
IMO 9507609
|
12,094 | 2012 |
14.7
|
C |
| 1243 |
MSC ADA F
IMO 9190119
|
14,000 | 2000 |
14.7
|
C |
| 1244 |
JOAV I
IMO 9020285
|
4,191 | 1991 |
14.7
|
C |
| 1245 |
RIX PACIFIC
IMO 9167978
|
3,210 | 1998 |
14.7
|
C |
| 1246 |
KFS MERYEM ANA
IMO 9575888
|
8,375 | 2010 |
14.7
|
C |
| 1247 |
IRIS I
IMO 9341172
|
9,402 | 2007 |
14.7
|
C |
| 1248 |
JULIE
IMO 9277307
|
7,890 | 2003 |
14.7
|
C |
| 1249 |
WESERBORG
IMO 9505558
|
9,685 | 2011 |
14.7
|
C |
| 1250 |
VIKTORIA-B
IMO 9313632
|
2,910 | 2005 |
14.7
|
C |
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.