Most Emission-Efficient Vehicle Carriers
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 |
GRAND MERCURY
IMO 9247584
|
19,121 | 2002 |
17.8
|
D |
| 302 |
GRAND DUKE
IMO 9303170
|
18,315 | 2005 |
17.8
|
D |
| 303 |
GLOVIS SPIRIT
IMO 9674165
|
20,002 | 2013 |
17.8
|
D |
| 304 |
EUPHRATES HIGHWAY
IMO 9604926
|
18,668 | 2012 |
17.8
|
D |
| 305 |
MORNING CALYPSO
IMO 9638460
|
18,713 | 2013 |
17.8
|
D |
| 306 |
SUNBELT SPIRIT
IMO 9233246
|
17,950 | 2002 |
17.9
|
D |
| 307 |
BOSPORUS HIGHWAY
IMO 9519107
|
18,792 | 2009 |
17.9
|
D |
| 308 |
BISHU HIGHWAY
IMO 9409340
|
17,649 | 2009 |
17.9
|
D |
| 309 |
SUNLIGHT ACE
IMO 9338864
|
18,855 | 2009 |
17.9
|
D |
| 310 |
GOLD ESTRELLA
IMO 9339844
|
18,079 | 2008 |
17.9
|
D |
| 311 |
DREAM ORCHID
IMO 9360568
|
15,097 | 2009 |
18.0
|
D |
| 312 |
GRANDE BALTIMORA
IMO 9784037
|
18,447 | 2017 |
18.0
|
D |
| 313 |
LIBERTY
IMO 9310109
|
19,628 | 2006 |
18.0
|
D |
| 314 |
GLOVIS SYMPHONY
IMO 9702429
|
19,911 | 2014 |
18.1
|
D |
| 315 |
CANADIAN HIGHWAY
IMO 9574066
|
18,581 | 2010 |
18.1
|
D |
| 316 |
SILVER RAY
IMO 9181376
|
16,157 | 1999 |
18.1
|
D |
| 317 |
GARNET ACE
IMO 9476769
|
18,740 | 2010 |
18.1
|
D |
| 318 |
GRAND COSMO
IMO 9303182
|
18,288 | 2006 |
18.2
|
D |
| 319 |
VEGA LEADER
IMO 9213818
|
16,396 | 2000 |
18.3
|
D |
| 320 |
HOEGH OSAKA
IMO 9185463
|
16,886 | 2000 |
18.4
|
D |
| 321 |
GLOVIS SUMMIT
IMO 9702417
|
19,911 | 2014 |
18.4
|
D |
| 322 |
GRAND PAVO
IMO 9284776
|
18,376 | 2005 |
18.5
|
D |
| 323 |
PORGY
IMO 9409338
|
18,009 | 2009 |
18.5
|
D |
| 324 |
GLOVIS COMPANION
IMO 9460899
|
18,548 | 2010 |
18.6
|
D |
| 325 |
GOLD HOSHI
IMO 9453298
|
22,288 | 2011 |
18.6
|
D |
| 326 |
NEPTUNE KOPER
IMO 9279812
|
14,520 | 2004 |
18.6
|
D |
| 327 |
BRILLIANT ACE
IMO 9598012
|
18,448 | 2011 |
18.6
|
D |
| 328 |
MICHIGAN HIGHWAY
IMO 9339832
|
17,673 | 2008 |
18.6
|
D |
| 329 |
MERCURY ACE
IMO 9591052
|
19,110 | 2011 |
18.6
|
D |
| 330 |
NEPTUNE ACE
IMO 9584059
|
18,436 | 2010 |
18.6
|
D |
| 331 |
MEDITERRANEAN HIGHWAY
IMO 9250220
|
17,228 | 2002 |
18.7
|
D |
| 332 |
GENUINE ACE
IMO 9610418
|
18,377 | 2012 |
18.7
|
D |
| 333 |
VIKING BRAVERY
IMO 9673020
|
18,446 | 2015 |
18.8
|
D |
| 334 |
LAKE GENEVA
IMO 9713882
|
18,611 | 2015 |
18.8
|
D |
| 335 |
PRIME ACE
IMO 9610444
|
18,304 | 2014 |
18.8
|
D |
| 336 |
GLOVIS SPLENDOR
IMO 9702431
|
20,056 | 2014 |
18.8
|
D |
| 337 |
JIUYANG BLOSSOM
IMO 9318474
|
16,889 | 2007 |
18.8
|
D |
| 338 |
LYDDEN
IMO 9782091
|
18,168 | 2018 |
18.9
|
D |
| 339 |
NEPTUNE BARCELONA
IMO 9762546
|
17,416 | 2022 |
18.9
|
D |
| 340 |
GUANGZHOU HIGHWAY
IMO 9294367
|
15,301 | 2006 |
18.9
|
D |
| 341 |
NEPTUNE THALASSA
IMO 9668506
|
11,262 | 2014 |
18.9
|
D |
| 342 |
GLOVIS SUPERIOR
IMO 9674189
|
20,002 | 2013 |
18.9
|
D |
| 343 |
GRAND VENUS
IMO 9303211
|
18,107 | 2006 |
18.9
|
D |
| 344 |
PLEIADES SPIRIT
IMO 9409326
|
17,424 | 2008 |
19.0
|
D |
| 345 |
GRANDE HALIFAX
IMO 9784051
|
18,353 | 2018 |
19.0
|
D |
| 346 |
ETERNAL ACE
IMO 9606479
|
18,418 | 2011 |
19.0
|
D |
| 347 |
TRANQUIL ACE
IMO 9561253
|
18,840 | 2009 |
19.1
|
D |
| 348 |
GRAND DIAMOND
IMO 9303223
|
18,058 | 2007 |
19.1
|
D |
| 349 |
VIKING QUEEN
IMO 9318462
|
16,890 | 2007 |
19.2
|
D |
| 350 |
MORNING CLAIRE
IMO 9620683
|
16,491 | 2012 |
19.2
|
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 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.