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 |
|---|---|---|---|---|---|
| 251 |
GRACEFUL LEADER
IMO 9357303
|
20,986 | 2007 |
15.9
|
C |
| 252 |
MORNING CHORUS
IMO 9312834
|
21,276 | 2007 |
15.9
|
C |
| 253 |
SEA HELLINIS
IMO 9328728
|
14,962 | 2005 |
15.9
|
C |
| 254 |
MORNING PRIDE
IMO 9681431
|
22,675 | 2014 |
16.0
|
C |
| 255 |
EQUULEUS LEADER
IMO 9342906
|
20,141 | 2005 |
16.0
|
C |
| 256 |
RUBY ACE
IMO 9476757
|
18,724 | 2010 |
16.0
|
C |
| 257 |
SANDERLING ACE
IMO 9409481
|
18,865 | 2007 |
16.0
|
C |
| 258 |
GLOVIS SUNRISE
IMO 9702405
|
19,911 | 2014 |
16.0
|
C |
| 259 |
SUNLIGHT ACE
IMO 9338864
|
18,855 | 2009 |
16.1
|
C |
| 260 |
ETERNAL ACE
IMO 9606479
|
18,418 | 2011 |
16.1
|
C |
| 261 |
MORNING CLARA
IMO 9460887
|
18,638 | 2009 |
16.1
|
C |
| 262 |
SUNBELT SPIRIT
IMO 9233246
|
17,950 | 2002 |
16.1
|
C |
| 263 |
MORNING CELLO
IMO 9329461
|
21,060 | 2007 |
16.1
|
C |
| 264 |
GLOVIS CAPTAIN
IMO 9707015
|
20,019 | 2015 |
16.1
|
C |
| 265 |
VIKING BRAVERY
IMO 9673020
|
18,446 | 2015 |
16.1
|
C |
| 266 |
JISU GLORY
IMO 9981582
|
19,160 | 2025 |
16.1
|
C |
| 267 |
GLOVIS SOLAR
IMO 9955650
|
19,322 | 2024 |
16.1
|
C |
| 268 |
SWIFT ACE
IMO 9338838
|
18,865 | 2008 |
16.1
|
C |
| 269 |
DEMETER LEADER
IMO 9477921
|
20,019 | 2009 |
16.2
|
C |
| 270 |
METIS LEADER
IMO 9650743
|
19,013 | 2013 |
16.2
|
C |
| 271 |
NOBLE ACE
IMO 9493365
|
18,946 | 2011 |
16.2
|
C |
| 272 |
TRIUMPH ACE
IMO 9209506
|
20,131 | 2000 |
16.2
|
C |
| 273 |
ASIAN MAJESTY
IMO 9203576
|
25,818 | 1999 |
16.2
|
C |
| 274 |
ONYX ARROW
IMO 9267924
|
21,087 | 2006 |
16.2
|
C |
| 275 |
CRYSTAL ACE
IMO 9539224
|
18,481 | 2012 |
16.2
|
C |
| 276 |
ANJI VIRTUE
IMO 9973391
|
19,359 | 2025 |
16.2
|
C |
| 277 |
SFL COMPOSER
IMO 9293583
|
18,881 | 2005 |
16.2
|
C |
| 278 |
HORIZON HIGHWAY
IMO 9726700
|
20,586 | 2016 |
16.3
|
C |
| 279 |
GRAND PIONEER
IMO 9247572
|
19,120 | 2002 |
16.3
|
C |
| 280 |
AUTO WAY
IMO 9303558
|
19,670 | 2006 |
16.3
|
C |
| 281 |
HOEGH TROVE
IMO 9186302
|
21,200 | 2000 |
16.3
|
C |
| 282 |
CENTAURUS LEADER
IMO 9284740
|
21,471 | 2004 |
16.3
|
C |
| 283 |
RCC CLASSIC
IMO 9441609
|
21,000 | 2013 |
16.3
|
C |
| 284 |
GREEN DELTA
IMO 9498602
|
18,056 | 2010 |
16.3
|
C |
| 285 |
YUAN HAI KOU
IMO 9999589
|
19,132 | 2025 |
16.3
|
C |
| 286 |
HECTOR HIGHWAY
IMO 9982720
|
18,522 | 2025 |
16.4
|
C |
| 287 |
TORRENS
IMO 9293612
|
21,965 | 2004 |
16.4
|
C |
| 288 |
ATLAS LEADER
IMO 9531739
|
21,323 | 2010 |
16.4
|
D |
| 289 |
VIRGO LEADER
IMO 9273894
|
20,111 | 2004 |
16.4
|
D |
| 290 |
HEROIC LEADER
IMO 9441570
|
20,434 | 2011 |
16.4
|
D |
| 291 |
GLOVIS SUNSHINE
IMO 9955662
|
19,322 | 2024 |
16.5
|
D |
| 292 |
GLOVIS COMPANION
IMO 9460899
|
18,548 | 2010 |
16.5
|
D |
| 293 |
EMERALD ACE
IMO 9539236
|
18,334 | 2012 |
16.5
|
D |
| 294 |
MORNING CAROL
IMO 9336086
|
21,044 | 2008 |
16.5
|
D |
| 295 |
HAMBURG HIGHWAY
IMO 9712644
|
20,703 | 2015 |
16.5
|
D |
| 296 |
SANG SHIN
IMO 9073701
|
16,178 | 1994 |
16.5
|
D |
| 297 |
ONYX ACE
IMO 9539212
|
18,529 | 2012 |
16.5
|
D |
| 298 |
MORNING CALYPSO
IMO 9638460
|
18,713 | 2013 |
16.6
|
D |
| 299 |
NEPTUNE BARCELONA
IMO 9762546
|
17,416 | 2022 |
16.6
|
D |
| 300 |
MORNING CINDY
IMO 9633185
|
18,735 | 2012 |
16.6
|
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.