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 |
|---|---|---|---|---|---|
| 351 |
GRAND SAPPHIRE
IMO 9325233
|
18,099 | 2007 |
19.2
|
D |
| 352 |
GLOVIS STELLA
IMO 9749570
|
19,638 | 2016 |
19.3
|
D |
| 353 |
NEPTUNE GALENE
IMO 9668491
|
11,260 | 2014 |
19.3
|
E |
| 354 |
BROOKLANDS
IMO 9748289
|
18,332 | 2017 |
19.3
|
E |
| 355 |
AN JI 24
IMO 9776860
|
11,631 | 2017 |
19.4
|
E |
| 356 |
GLOVIS SPRING
IMO 9749594
|
19,638 | 2016 |
19.4
|
E |
| 357 |
GRAND AURORA
IMO 9279331
|
18,381 | 2004 |
19.5
|
E |
| 358 |
GRANDE ROMA
IMO 9247936
|
14,567 | 2003 |
19.5
|
E |
| 359 |
GRANDE NEW YORK
IMO 9784049
|
18,360 | 2017 |
19.5
|
E |
| 360 |
GLOVIS SUN
IMO 9749568
|
19,638 | 2015 |
19.6
|
E |
| 361 |
GRAND NEPTUNE
IMO 9303209
|
18,318 | 2006 |
19.7
|
E |
| 362 |
GRAND HERO
IMO 9339806
|
18,085 | 2007 |
19.7
|
E |
| 363 |
WISTERIA ACE
IMO 9355197
|
17,325 | 2007 |
19.7
|
E |
| 364 |
SILVER GLORY
IMO 9070474
|
13,363 | 1994 |
19.7
|
E |
| 365 |
CLOVER ACE
IMO 9363950
|
17,280 | 2008 |
19.9
|
E |
| 366 |
MORNING CHRISTINA
IMO 9574054
|
18,460 | 2010 |
19.9
|
E |
| 367 |
MORNING CAROL
IMO 9336086
|
21,044 | 2008 |
19.9
|
E |
| 368 |
GLOVIS SIRIUS
IMO 9749582
|
19,638 | 2016 |
19.9
|
E |
| 369 |
DREAM DIVA
IMO 9325790
|
15,068 | 2007 |
19.9
|
E |
| 370 |
LAVENDER ACE
IMO 9363948
|
17,262 | 2008 |
20.2
|
E |
| 371 |
BLANCO ACE
IMO 9889112
|
17,885 | 2021 |
20.3
|
E |
| 372 |
VALIANT ACE
IMO 9610420
|
18,143 | 2012 |
20.4
|
E |
| 373 |
BANGKOK HIGHWAY
IMO 9506710
|
15,306 | 2009 |
20.5
|
E |
| 374 |
GRANDE NAPOLI
IMO 9247924
|
14,565 | 2003 |
20.6
|
E |
| 375 |
NEPTUNE HELLAS
IMO 9440148
|
11,174 | 2009 |
20.6
|
E |
| 376 |
SANDERLING ACE
IMO 9409481
|
18,865 | 2007 |
20.7
|
E |
| 377 |
COSCO SHENGSHI
IMO 9454711
|
14,868 | 2011 |
20.7
|
E |
| 378 |
COSCO TENGFEI
IMO 9454723
|
14,707 | 2011 |
20.7
|
E |
| 379 |
VICTORIOUS ACE
IMO 9610406
|
18,396 | 2011 |
20.8
|
E |
| 380 |
DONINGTON
IMO 9748291
|
18,241 | 2017 |
20.8
|
E |
| 381 |
EMERALD LEADER
IMO 9361811
|
10,821 | 2008 |
21.0
|
E |
| 382 |
CORAL LEADER
IMO 9318486
|
10,859 | 2006 |
21.0
|
E |
| 383 |
GRANDE TORINO
IMO 9782675
|
15,853 | 2018 |
21.2
|
E |
| 384 |
LAKE COMO
IMO 9432919
|
12,321 | 2009 |
21.6
|
E |
| 385 |
CATTLEYA ACE
IMO 9544918
|
16,384 | 2011 |
21.6
|
E |
| 386 |
GLOVIS COSMOS
IMO 9707027
|
20,019 | 2015 |
21.7
|
E |
| 387 |
GRANDE TEXAS
IMO 9796365
|
15,853 | 2021 |
21.8
|
E |
| 388 |
GRANDE MIRAFIORI
IMO 9782687
|
15,853 | 2019 |
21.8
|
E |
| 389 |
PIRANHA
IMO 9088249
|
12,490 | 1997 |
21.9
|
E |
| 390 |
GRANDE HOUSTON
IMO 9782699
|
15,853 | 2020 |
21.9
|
E |
| 391 |
GRAND BENELUX
IMO 9227900
|
12,594 | 2001 |
22.1
|
E |
| 392 |
LAKE TAUPO
IMO 9289908
|
12,665 | 2003 |
22.1
|
E |
| 393 |
NEPTUNE ODYSSEY
IMO 9440095
|
11,418 | 2010 |
22.2
|
E |
| 394 |
LAKE WANAKA
IMO 9432892
|
12,300 | 2008 |
22.3
|
E |
| 395 |
NEPTUNE ILIAD
IMO 9440100
|
11,409 | 2010 |
22.3
|
E |
| 396 |
GRANDE CALIFORNIA
IMO 9796377
|
15,853 | 2021 |
22.3
|
E |
| 397 |
CHANG TAI HONG
IMO 9382102
|
12,282 | 2009 |
22.7
|
E |
| 398 |
NEPTUNE PHOS
IMO 9451719
|
11,174 | 2009 |
22.7
|
E |
| 399 |
GRANDE FLORIDA
IMO 9782716
|
15,853 | 2020 |
22.7
|
E |
| 400 |
CARNATION ACE
IMO 9544920
|
16,416 | 2011 |
22.7
|
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 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.