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 |
|---|---|---|---|---|---|
| 201 |
MORNING COURIER
IMO 9285639
|
21,004 | 2005 |
15.8
|
C |
| 202 |
GLOVIS CHALLENGE
IMO 9590591
|
20,895 | 2012 |
15.8
|
C |
| 203 |
RCC CLASSIC
IMO 9441609
|
21,000 | 2013 |
15.8
|
C |
| 204 |
PLEIADES LEADER
IMO 9426374
|
21,364 | 2009 |
15.8
|
C |
| 205 |
EQUULEUS LEADER
IMO 9342906
|
20,141 | 2005 |
15.8
|
C |
| 206 |
TORONTO
IMO 9302205
|
21,965 | 2005 |
15.9
|
C |
| 207 |
NOCC OCEANIC
IMO 9624029
|
20,883 | 2012 |
15.9
|
C |
| 208 |
SELENE LEADER
IMO 9498597
|
18,082 | 2010 |
15.9
|
C |
| 209 |
MORNING CONCERT
IMO 9312822
|
21,279 | 2006 |
16.0
|
C |
| 210 |
PROGRESS ACE
IMO 9267687
|
19,512 | 2003 |
16.0
|
C |
| 211 |
POLARIS HIGHWAY
IMO 9728095
|
20,494 | 2017 |
16.0
|
C |
| 212 |
GLOVIS SUPREME
IMO 9674177
|
20,002 | 2013 |
16.0
|
C |
| 213 |
METIS LEADER
IMO 9650743
|
19,013 | 2013 |
16.0
|
C |
| 214 |
MORNING LILY
IMO 9446013
|
27,283 | 2011 |
16.0
|
C |
| 215 |
AUTO ASPIRE
IMO 9895812
|
12,452 | 2022 |
16.1
|
C |
| 216 |
AURIGA LEADER
IMO 9402718
|
18,686 | 2008 |
16.1
|
C |
| 217 |
HORIZON HIGHWAY
IMO 9726700
|
20,586 | 2016 |
16.1
|
C |
| 218 |
DIGNITY LEADER
IMO 9441506
|
20,589 | 2010 |
16.1
|
C |
| 219 |
THEMIS
IMO 9722314
|
23,786 | 2016 |
16.1
|
C |
| 220 |
APOLLON HIGHWAY
IMO 9728083
|
20,321 | 2017 |
16.1
|
C |
| 221 |
MIRACULOUS ACE
IMO 9293521
|
19,381 | 2006 |
16.2
|
C |
| 222 |
SWAN ACE
IMO 9338826
|
18,867 | 2008 |
16.2
|
C |
| 223 |
DRIVE GREEN HIGHWAY
IMO 9728069
|
20,034 | 2016 |
16.2
|
C |
| 224 |
CYGNUS LEADER
IMO 9381249
|
20,180 | 2007 |
16.2
|
C |
| 225 |
TOLEDO
IMO 9293624
|
21,965 | 2005 |
16.2
|
C |
| 226 |
SAIC ANJI SPLENDOR
IMO 9973365
|
18,162 | 2024 |
16.2
|
C |
| 227 |
SEA PATRIS
IMO 8415794
|
13,895 | 1985 |
16.2
|
C |
| 228 |
THEMIS LEADER
IMO 9553115
|
20,037 | 2010 |
16.2
|
C |
| 229 |
MORNING COMPOSER
IMO 9336074
|
21,053 | 2008 |
16.3
|
C |
| 230 |
RUBY ACE
IMO 9476757
|
18,724 | 2010 |
16.3
|
C |
| 231 |
RCC COMPASS
IMO 9441611
|
21,000 | 2013 |
16.3
|
C |
| 232 |
ELEGANT ACE
IMO 9561265
|
18,833 | 2010 |
16.3
|
C |
| 233 |
FREEDOM ACE
IMO 9293662
|
19,093 | 2005 |
16.3
|
C |
| 234 |
HOEGH YOKOHAMA
IMO 9185451
|
16,919 | 2000 |
16.3
|
C |
| 235 |
AUTO WAY
IMO 9303558
|
19,670 | 2006 |
16.3
|
C |
| 236 |
ASIAN VISION
IMO 9122966
|
21,421 | 1997 |
16.3
|
C |
| 237 |
GRAND LEGACY
IMO 9355240
|
18,075 | 2009 |
16.3
|
C |
| 238 |
GRAVITY HIGHWAY
IMO 9672404
|
21,000 | 2014 |
16.3
|
C |
| 239 |
GRAND DAHLIA
IMO 9355238
|
18,054 | 2009 |
16.4
|
C |
| 240 |
EMERALD ACE
IMO 9539236
|
18,334 | 2012 |
16.4
|
C |
| 241 |
VICTORIA HIGHWAY
IMO 9827255
|
21,114 | 2018 |
16.4
|
C |
| 242 |
COLUMBIA HIGHWAY
IMO 9442873
|
18,930 | 2008 |
16.4
|
C |
| 243 |
SAIC ANJI SINCERITY
IMO 9973377
|
18,600 | 2024 |
16.4
|
C |
| 244 |
HOEGH NEW YORK
IMO 9295830
|
21,099 | 2005 |
16.5
|
C |
| 245 |
ORION HIGHWAY
IMO 9728071
|
20,532 | 2016 |
16.5
|
C |
| 246 |
EUPHONY ACE
IMO 9293595
|
18,944 | 2005 |
16.6
|
C |
| 247 |
HAWAIIAN HIGHWAY
IMO 9712632
|
20,606 | 2015 |
16.6
|
C |
| 248 |
GLOVIS CENTURY
IMO 9590589
|
20,895 | 2012 |
16.6
|
C |
| 249 |
MORNING CALM
IMO 9285615
|
21,005 | 2004 |
16.7
|
C |
| 250 |
BESS
IMO 9531715
|
18,013 | 2010 |
16.7
|
C |
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.