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 |
|---|---|---|---|---|---|
| 251 |
WISDOM ACE
IMO 9641833
|
19,227 | 2013 |
16.7
|
C |
| 252 |
TORINO
IMO 9398321
|
22,160 | 2009 |
16.7
|
C |
| 253 |
MORNING POST
IMO 9669029
|
22,675 | 2014 |
16.7
|
C |
| 254 |
LIBERTY PEACE
IMO 9777890
|
20,397 | 2017 |
16.7
|
C |
| 255 |
MORNING CROWN
IMO 9285641
|
21,053 | 2005 |
16.7
|
C |
| 256 |
GLOBAL HIGHWAY
IMO 9726695
|
20,686 | 2016 |
16.7
|
C |
| 257 |
PALMELA
IMO 9207388
|
20,581 | 2000 |
16.7
|
C |
| 258 |
GRAND PIONEER
IMO 9247572
|
19,120 | 2002 |
16.8
|
C |
| 259 |
VIKING DESTINY
IMO 9728863
|
18,500 | 2017 |
16.8
|
C |
| 260 |
BYD EXPLORER NO. 1
IMO 9955181
|
19,177 | 2024 |
16.8
|
C |
| 261 |
HELIOS RAY
IMO 9690547
|
20,903 | 2015 |
16.8
|
C |
| 262 |
ATHENS HIGHWAY
IMO 9443073
|
18,809 | 2008 |
16.8
|
C |
| 263 |
MERMAID ACE
IMO 9561289
|
18,828 | 2010 |
16.8
|
C |
| 264 |
HOEGH TRANSPORTER
IMO 9176395
|
16,747 | 1999 |
16.8
|
C |
| 265 |
PRIMROSE ACE
IMO 9355185
|
17,339 | 2007 |
16.9
|
D |
| 266 |
SIRIUS HIGHWAY
IMO 9757981
|
20,419 | 2017 |
16.9
|
D |
| 267 |
PROMINENT ACE
IMO 9267699
|
19,550 | 2004 |
16.9
|
D |
| 268 |
HAMBURG HIGHWAY
IMO 9712644
|
20,703 | 2015 |
17.0
|
D |
| 269 |
GLOVIS SUNSHINE
IMO 9955662
|
19,322 | 2024 |
17.0
|
D |
| 270 |
HOEGH OSLO
IMO 9382396
|
16,650 | 2008 |
17.0
|
D |
| 271 |
LIAO HE KOU
IMO 9991757
|
19,097 | 2022 |
17.0
|
D |
| 272 |
ONYX ARROW
IMO 9267924
|
21,087 | 2006 |
17.1
|
D |
| 273 |
GLOVIS CLIPPER
IMO 9441582
|
20,434 | 2012 |
17.1
|
D |
| 274 |
HEROIC LEADER
IMO 9441570
|
20,434 | 2011 |
17.1
|
D |
| 275 |
GRAND VICTORY
IMO 9334234
|
18,299 | 2008 |
17.2
|
D |
| 276 |
GRACIOUS ACE
IMO 9604914
|
18,924 | 2012 |
17.2
|
D |
| 277 |
OREGON HIGHWAY
IMO 9381665
|
17,699 | 2007 |
17.2
|
D |
| 278 |
GLOVIS CARAVEL
IMO 9441594
|
20,434 | 2012 |
17.2
|
D |
| 279 |
BRASILIA HIGHWAY
IMO 9519119
|
18,793 | 2009 |
17.2
|
D |
| 280 |
GRAND ORION
IMO 9303194
|
18,312 | 2006 |
17.2
|
D |
| 281 |
SANG SHIN
IMO 9073701
|
16,178 | 1994 |
17.3
|
D |
| 282 |
ASIAN EMPEROR
IMO 9176632
|
21,472 | 1999 |
17.4
|
D |
| 283 |
GRAND PHOENIX
IMO 9284764
|
18,383 | 2005 |
17.4
|
D |
| 284 |
MARVELOUS ACE
IMO 9293519
|
19,401 | 2006 |
17.4
|
D |
| 285 |
SFL CONDUCTOR
IMO 9293909
|
17,709 | 2006 |
17.5
|
D |
| 286 |
AZUL ACE
IMO 9889100
|
17,961 | 2021 |
17.5
|
D |
| 287 |
CALIFORNIA HIGHWAY
IMO 9574078
|
18,644 | 2010 |
17.5
|
D |
| 288 |
NOBLE ACE
IMO 9493365
|
18,946 | 2011 |
17.5
|
D |
| 289 |
MORNING CINDY
IMO 9633185
|
18,735 | 2012 |
17.5
|
D |
| 290 |
SWALLOW ACE
IMO 9338620
|
18,864 | 2007 |
17.5
|
D |
| 291 |
GALVESTON HIGHWAY
IMO 9675573
|
18,549 | 2014 |
17.6
|
D |
| 292 |
VIRGO LEADER
IMO 9273894
|
20,111 | 2004 |
17.6
|
D |
| 293 |
SPLENDID ACE
IMO 9252228
|
19,893 | 2003 |
17.6
|
D |
| 294 |
VIKING ADVENTURE
IMO 9673018
|
18,375 | 2015 |
17.6
|
D |
| 295 |
PARADISE ACE
IMO 9293648
|
19,080 | 2004 |
17.6
|
D |
| 296 |
GLOVIS SOLAR
IMO 9955650
|
19,322 | 2024 |
17.6
|
D |
| 297 |
OPAL ACE
IMO 9539183
|
18,507 | 2011 |
17.7
|
D |
| 298 |
TAIPAN
IMO 9311866
|
21,021 | 2006 |
17.7
|
D |
| 299 |
GEORGIA HIGHWAY
IMO 9339820
|
17,685 | 2007 |
17.8
|
D |
| 300 |
GALAXY ACE
IMO 9624237
|
18,878 | 2012 |
17.8
|
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.