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 2024. 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 |
|---|---|---|---|---|---|
| 301 |
BLUE ONE
IMO 9585651
|
37,064 | 2011 |
6.6
|
B |
| 302 |
PACIFIC HARMONY
IMO 9701451
|
31,798 | 2015 |
6.6
|
B |
| 303 |
FIRST BROTHER
IMO 9266140
|
32,385 | 2003 |
6.7
|
B |
| 305 |
INVENTANA
IMO 9186223
|
44,982 | 2000 |
6.7
|
B |
| 304 |
K BEREKET
IMO 9370408
|
33,225 | 2008 |
6.7
|
B |
| 306 |
EIKE OLDENDORFF
IMO 9794472
|
38,520 | 2017 |
6.7
|
B |
| 308 |
TIAN QI
IMO 9722742
|
37,940 | 2016 |
6.7
|
B |
| 307 |
ECO TIDE
IMO 9576739
|
35,916 | 2011 |
6.7
|
B |
| 309 |
STAR KVARVEN
IMO 9396153
|
49,856 | 2010 |
6.7
|
B |
| 310 |
NEGMAR CICEK
IMO 9542685
|
31,997 | 2011 |
6.7
|
B |
| 311 |
HG ROTTERDAM
IMO 9598921
|
37,873 | 2019 |
6.7
|
B |
| 312 |
UBC SALERNO
IMO 9652519
|
32,702 | 2013 |
6.7
|
B |
| 313 |
SEREF KURU
IMO 8606111
|
13,047 | 1987 |
6.8
|
B |
| 314 |
ECO CATHAR
IMO 9526162
|
38,494 | 2012 |
6.8
|
B |
| 315 |
IVS SUNBIRD
IMO 9736042
|
33,399 | 2015 |
6.8
|
B |
| 316 |
PRIME STAR
IMO 9612284
|
36,570 | 2012 |
6.8
|
B |
| 317 |
PATRIA
IMO 9580053
|
32,069 | 2014 |
6.8
|
B |
| 320 |
DOUBLE DIAMOND
IMO 9478470
|
33,145 | 2011 |
6.8
|
B |
| 322 |
PRINCE FAROUK
IMO 9125229
|
26,412 | 1997 |
6.8
|
B |
| 319 |
TIAN LU
IMO 9704740
|
38,122 | 2015 |
6.8
|
B |
| 318 |
SAVONA
IMO 9220976
|
31,923 | 2000 |
6.8
|
B |
| 321 |
SUNSET
IMO 9402122
|
37,334 | 2009 |
6.8
|
B |
| 323 |
OBE DINARES
IMO 9370367
|
33,440 | 2008 |
6.8
|
B |
| 325 |
AFRICAN HALCYON
IMO 9343613
|
32,245 | 2007 |
6.8
|
B |
| 324 |
NORDIC OSLO
IMO 9626601
|
35,866 | 2012 |
6.8
|
B |
| 326 |
FUAT SEZGIN
IMO 9597587
|
38,278 | 2011 |
6.8
|
B |
| 327 |
KUROBE
IMO 9392171
|
30,166 | 2010 |
6.9
|
B |
| 331 |
CORINTHIAN SPIRE
IMO 9478482
|
32,155 | 2009 |
6.9
|
B |
| 330 |
REESTBORG
IMO 9592563
|
23,296 | 2013 |
6.9
|
B |
| 329 |
UBC STOCKHOLM
IMO 9426879
|
33,301 | 2010 |
6.9
|
B |
| 328 |
AKDENIZ S
IMO 9519377
|
9,161 | 2008 |
6.9
|
B |
| 332 |
FERASET
IMO 9747651
|
26,354 | 2015 |
6.9
|
B |
| 333 |
RUBY
IMO 9626390
|
37,039 | 2012 |
6.9
|
B |
| 334 |
KAPADOKYA
IMO 9268083
|
31,646 | 2003 |
6.9
|
B |
| 335 |
PLUTO
IMO 9432531
|
32,092 | 2014 |
6.9
|
B |
| 337 |
BC ZOE
IMO 9711901
|
33,443 | 2014 |
6.9
|
B |
| 336 |
AAL LIMASSOL
IMO 9958755
|
32,517 | 2024 |
6.9
|
B |
| 338 |
TRANSAMERICA
IMO 9486257
|
26,391 | 2010 |
6.9
|
B |
| 339 |
MOON GATE
IMO 9400904
|
32,292 | 2009 |
6.9
|
B |
| 340 |
IVS KINGLET
IMO 9459149
|
33,132 | 2011 |
7.0
|
B |
| 341 |
USG ZURICH
IMO 9458444
|
28,309 | 2013 |
7.0
|
B |
| 342 |
INCHEON BAY
IMO 9791963
|
37,501 | 2017 |
7.0
|
B |
| 343 |
PROPEL PROSPERITY
IMO 9317690
|
37,504 | 2006 |
7.0
|
B |
| 344 |
CAPTAIN DIMITRIS S
IMO 9400954
|
32,309 | 2010 |
7.0
|
B |
| 346 |
LIBRA DREAM
IMO 9302918
|
31,700 | 2005 |
7.0
|
B |
| 345 |
CHIPOL YONG AN
IMO 9509683
|
33,249 | 2010 |
7.0
|
B |
| 350 |
ATLANTIC ISLAND
IMO 9628245
|
33,680 | 2012 |
7.0
|
B |
| 349 |
MANTA ZUHAL
IMO 9374351
|
37,313 | 2008 |
7.0
|
B |
| 348 |
UBC TOKYO
IMO 9300752
|
37,865 | 2005 |
7.0
|
B |
| 347 |
MANTA HACER
IMO 9303429
|
32,316 | 2004 |
7.0
|
B |
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 2024 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.