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 |
|---|---|---|---|---|---|
| 351 |
GLOVIS SUCCESS
IMO 9964285
|
19,322 | 2025 |
17.7
|
D |
| 352 |
GOLD HOSHI
IMO 9453298
|
22,288 | 2011 |
17.7
|
D |
| 353 |
TORONTO
IMO 9302205
|
21,965 | 2005 |
17.8
|
D |
| 354 |
GRAVITY HIGHWAY
IMO 9672404
|
21,000 | 2014 |
17.9
|
D |
| 355 |
CHANG TAI HONG
IMO 9382102
|
12,282 | 2009 |
17.9
|
D |
| 356 |
CANADIAN HIGHWAY
IMO 9574066
|
18,581 | 2010 |
17.9
|
D |
| 357 |
NESTOR RAY
IMO 9970648
|
18,522 | 2025 |
17.9
|
D |
| 358 |
ANJI PRESTIGE
IMO 9973389
|
19,359 | 2025 |
17.9
|
D |
| 359 |
SWALLOW ACE
IMO 9338620
|
18,864 | 2007 |
17.9
|
D |
| 360 |
GLOVIS SPIRIT
IMO 9674165
|
20,002 | 2013 |
17.9
|
D |
| 361 |
FIRMAMENT ACE
IMO 9293894
|
17,713 | 2006 |
17.9
|
D |
| 362 |
GLOVIS SOLOMON
IMO 9445409
|
26,988 | 2011 |
18.0
|
D |
| 363 |
MORNING CALM
IMO 9285615
|
21,005 | 2004 |
18.0
|
D |
| 364 |
DRIVE GREEN HIGHWAY
IMO 9728069
|
20,034 | 2016 |
18.1
|
D |
| 365 |
GOLD KOCHAV
IMO 9463205
|
22,196 | 2012 |
18.1
|
D |
| 366 |
TRANQUIL ACE
IMO 9561253
|
18,840 | 2009 |
18.1
|
D |
| 367 |
THRUXTON
IMO 9782089
|
18,160 | 2018 |
18.1
|
D |
| 368 |
SIRIUS HIGHWAY
IMO 9757981
|
20,419 | 2017 |
18.1
|
D |
| 369 |
UGR ZAKHER
IMO 9980411
|
19,521 | 2025 |
18.1
|
D |
| 370 |
GRAND VICTORY
IMO 9334234
|
18,299 | 2008 |
18.1
|
D |
| 371 |
GRANDE BALTIMORA
IMO 9784037
|
18,447 | 2017 |
18.2
|
D |
| 372 |
VIKING DESTINY
IMO 9728863
|
18,500 | 2017 |
18.3
|
D |
| 373 |
HELIOS RAY
IMO 9690547
|
20,903 | 2015 |
18.4
|
D |
| 374 |
GRACIOUS ACE
IMO 9604914
|
18,924 | 2012 |
18.4
|
D |
| 375 |
GRAND ORION
IMO 9303194
|
18,312 | 2006 |
18.4
|
D |
| 376 |
BLANCO ACE
IMO 9889112
|
17,885 | 2021 |
18.4
|
D |
| 377 |
ARGUS RAY
IMO 9970636
|
18,522 | 2024 |
18.4
|
D |
| 378 |
NEPTUNE KOPER
IMO 9279812
|
14,520 | 2004 |
18.4
|
D |
| 379 |
NEPTUNE THALASSA
IMO 9668506
|
11,262 | 2014 |
18.5
|
D |
| 380 |
GLOVIS SUPERIOR
IMO 9674189
|
20,002 | 2013 |
18.5
|
D |
| 381 |
GOLD ESTRELLA
IMO 9339844
|
18,079 | 2008 |
18.5
|
D |
| 382 |
GRAND HERO
IMO 9339806
|
18,085 | 2007 |
18.6
|
D |
| 383 |
SILVER GLORY
IMO 9070474
|
13,363 | 1994 |
18.6
|
D |
| 384 |
HYPERION RAY
IMO 9690559
|
20,903 | 2015 |
18.7
|
E |
| 385 |
DONINGTON
IMO 9748291
|
18,241 | 2017 |
18.7
|
E |
| 386 |
YONG LE KOU
IMO 9997593
|
20,964 | 2025 |
18.7
|
E |
| 387 |
GRAND PAVO
IMO 9284776
|
18,376 | 2005 |
18.7
|
E |
| 388 |
GEORGIA HIGHWAY
IMO 9339820
|
17,685 | 2007 |
18.7
|
E |
| 389 |
VEGA LEADER
IMO 9213818
|
16,396 | 2000 |
18.7
|
E |
| 390 |
GLOVIS STAR
IMO 9736808
|
20,941 | 2016 |
18.8
|
E |
| 391 |
CLOVER ACE
IMO 9363950
|
17,280 | 2008 |
18.8
|
E |
| 392 |
NEPTUNE HELLAS
IMO 9440148
|
11,174 | 2009 |
18.9
|
E |
| 393 |
AQUAMARINE ACE
IMO 9397987
|
18,772 | 2008 |
18.9
|
E |
| 394 |
NEPTUNE GALENE
IMO 9668491
|
11,260 | 2014 |
18.9
|
E |
| 395 |
CAPRICORNUS LEADER
IMO 9283863
|
20,120 | 2004 |
18.9
|
E |
| 396 |
DUGONG ACE
IMO 9777838
|
15,465 | 2019 |
18.9
|
E |
| 397 |
GRAND DAHLIA
IMO 9355238
|
18,054 | 2009 |
18.9
|
E |
| 398 |
AN JI 24
IMO 9776860
|
11,631 | 2017 |
19.0
|
E |
| 399 |
WEN JING KOU
IMO 9997555
|
21,097 | 2025 |
19.0
|
E |
| 400 |
GLOVIS SIRIUS
IMO 9749582
|
19,638 | 2016 |
19.1
|
E |
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.