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 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 |
|---|---|---|---|---|---|
| 301 |
PARADISE ACE
IMO 9293648
|
19,080 | 2004 |
16.6
|
D |
| 302 |
UGR AL SAMHA
IMO 9973444
|
18,600 | 2024 |
16.6
|
D |
| 303 |
VICTORIA HIGHWAY
IMO 9827255
|
21,114 | 2018 |
16.6
|
D |
| 304 |
TALIA
IMO 9311854
|
21,021 | 2006 |
16.7
|
D |
| 305 |
GRANDE MELBOURNE
IMO 9992684
|
21,520 | 2025 |
16.7
|
D |
| 306 |
MIN JIANG KOU
IMO 9991771
|
19,181 | 2025 |
16.8
|
D |
| 307 |
RCC ANTWERP
IMO 9441623
|
21,000 | 2013 |
16.8
|
D |
| 308 |
FREEDOM ACE
IMO 9293662
|
19,093 | 2005 |
16.8
|
D |
| 309 |
TOLEDO
IMO 9293624
|
21,965 | 2005 |
16.8
|
D |
| 310 |
GALVESTON HIGHWAY
IMO 9675573
|
18,549 | 2014 |
16.8
|
D |
| 311 |
SWAN ACE
IMO 9338826
|
18,867 | 2008 |
16.8
|
D |
| 312 |
GLOVIS CHORUS
IMO 9158604
|
21,497 | 1997 |
16.8
|
D |
| 313 |
GRANDE AUCKLAND
IMO 9992672
|
21,707 | 2025 |
16.8
|
D |
| 314 |
LIAO HE KOU
IMO 9991757
|
19,097 | 2022 |
16.8
|
D |
| 315 |
GLOVIS COMET
IMO 9122942
|
21,421 | 1996 |
16.8
|
D |
| 316 |
GLOVIS CROWN
IMO 9706994
|
20,019 | 2014 |
16.8
|
D |
| 317 |
SELENE LEADER
IMO 9498597
|
18,082 | 2010 |
16.9
|
D |
| 318 |
GRAND PHOENIX
IMO 9284764
|
18,383 | 2005 |
16.9
|
D |
| 319 |
HORIZON RAY
IMO 9441520
|
20,434 | 2010 |
16.9
|
D |
| 320 |
CALIFORNIA HIGHWAY
IMO 9574078
|
18,644 | 2010 |
16.9
|
D |
| 321 |
DURBAN HIGHWAY
IMO 9536961
|
18,906 | 2011 |
16.9
|
D |
| 322 |
PHOENIX LEADER
IMO 9283875
|
20,146 | 2004 |
17.0
|
D |
| 323 |
GARNET LEADER
IMO 9357327
|
21,020 | 2008 |
17.0
|
D |
| 324 |
BISHU HIGHWAY
IMO 9409340
|
17,649 | 2009 |
17.0
|
D |
| 325 |
AICC KUNPENG
IMO 1018389
|
18,885 | 2024 |
17.0
|
D |
| 326 |
GRAND LEGACY
IMO 9355240
|
18,075 | 2009 |
17.0
|
D |
| 327 |
GRAND SAPPHIRE
IMO 9325233
|
18,099 | 2007 |
17.1
|
D |
| 328 |
HAN WU KOU
IMO 9997581
|
20,977 | 2025 |
17.1
|
D |
| 329 |
THEMIS
IMO 9722314
|
23,786 | 2016 |
17.1
|
D |
| 330 |
COSCO TENGFEI
IMO 9454723
|
14,707 | 2011 |
17.1
|
D |
| 331 |
SAGITTARIUS LEADER
IMO 9283887
|
20,098 | 2005 |
17.1
|
D |
| 332 |
GLOVIS CARAVEL
IMO 9441594
|
20,434 | 2012 |
17.2
|
D |
| 333 |
SFL CONDUCTOR
IMO 9293909
|
17,709 | 2006 |
17.2
|
D |
| 334 |
MARTORELL
IMO 9267675
|
19,531 | 2003 |
17.2
|
D |
| 335 |
HOEGH OSLO
IMO 9382396
|
16,650 | 2008 |
17.2
|
D |
| 336 |
MERCURY ACE
IMO 9591052
|
19,110 | 2011 |
17.3
|
D |
| 337 |
ANJI FLOURISHMENT
IMO 1038602
|
24,435 | 2025 |
17.3
|
D |
| 338 |
GLOVIS CHALLENGE
IMO 9590591
|
20,895 | 2012 |
17.3
|
D |
| 339 |
GLOVIS SPRING
IMO 9749594
|
19,638 | 2016 |
17.3
|
D |
| 340 |
EURASIAN HIGHWAY
IMO 9604938
|
18,709 | 2012 |
17.4
|
D |
| 341 |
SILVER RAY
IMO 9181376
|
16,157 | 1999 |
17.4
|
D |
| 342 |
SUNSHINE ACE
IMO 9338852
|
18,858 | 2009 |
17.4
|
D |
| 343 |
LYDDEN
IMO 9782091
|
18,168 | 2018 |
17.4
|
D |
| 344 |
DREAM ORCHID
IMO 9360568
|
15,097 | 2009 |
17.4
|
D |
| 345 |
DIVINE ACE
IMO 9610432
|
18,134 | 2013 |
17.5
|
D |
| 346 |
GLOVIS CLIPPER
IMO 9441582
|
20,434 | 2012 |
17.6
|
D |
| 347 |
GLOVIS SIGMA
IMO 9736810
|
20,970 | 2016 |
17.6
|
D |
| 348 |
GRAND COSMO
IMO 9303182
|
18,288 | 2006 |
17.6
|
D |
| 349 |
HOEGH TRANSPORTER
IMO 9176395
|
16,747 | 1999 |
17.6
|
D |
| 350 |
HOEGH OSAKA
IMO 9185463
|
16,886 | 2000 |
17.7
|
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 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.