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 |
|---|---|---|---|---|---|
| 151 |
PATRIOT
IMO 9316139
|
22,564 | 2006 |
15.0
|
B |
| 152 |
G POSEIDON
IMO 9445394
|
27,003 | 2011 |
15.0
|
B |
| 153 |
RCC AMERICA
IMO 9277802
|
21,182 | 2003 |
15.1
|
B |
| 154 |
DIONYSOS LEADER
IMO 9426350
|
21,438 | 2009 |
15.1
|
B |
| 155 |
OCEANUS LEADER
IMO 9553488
|
21,351 | 2013 |
15.1
|
B |
| 156 |
GOLIATH LEADER
IMO 9357315
|
20,958 | 2008 |
15.2
|
B |
| 157 |
MORNING CORNET
IMO 9329473
|
21,050 | 2004 |
15.2
|
B |
| 158 |
ALTAIR LEADER
IMO 9539171
|
18,572 | 2011 |
15.3
|
B |
| 159 |
GLOVIS SOLOMON
IMO 9445409
|
26,988 | 2011 |
15.3
|
B |
| 160 |
GLOVIS COMET
IMO 9122942
|
21,421 | 1996 |
15.3
|
B |
| 162 |
TRITON LEADER
IMO 9553103
|
22,657 | 2010 |
15.3
|
B |
| 161 |
HERITAGE LEADER
IMO 9441556
|
20,434 | 2011 |
15.3
|
B |
| 163 |
SFL COMPOSER
IMO 9293583
|
18,881 | 2005 |
15.3
|
B |
| 164 |
VOLANS LEADER
IMO 9381237
|
20,168 | 2007 |
15.3
|
B |
| 165 |
GLOVIS SAFETY
IMO 9798399
|
25,353 | 2017 |
15.4
|
B |
| 166 |
GARNET LEADER
IMO 9357327
|
21,020 | 2008 |
15.4
|
B |
| 167 |
GLORIOUS LEADER
IMO 9357298
|
20,999 | 2007 |
15.4
|
B |
| 168 |
RCC ANTWERP
IMO 9441623
|
21,000 | 2013 |
15.4
|
B |
| 172 |
MORNING CHANT
IMO 9663300
|
20,139 | 2014 |
15.4
|
B |
| 171 |
GRAND URANUS
IMO 9472206
|
26,985 | 2012 |
15.4
|
B |
| 170 |
GAIA LEADER
IMO 9536818
|
21,286 | 2011 |
15.4
|
B |
| 169 |
CMA CGM MONZA
IMO 9953808
|
19,204 | 2024 |
15.4
|
B |
| 173 |
PHOENIX LEADER
IMO 9283875
|
20,146 | 2004 |
15.4
|
B |
| 174 |
MORNING CAPO
IMO 9663295
|
20,139 | 2013 |
15.4
|
B |
| 176 |
MORNING CELLO
IMO 9329461
|
21,060 | 2007 |
15.4
|
B |
| 175 |
OLYMPIAN HIGHWAY
IMO 9757993
|
20,445 | 2017 |
15.4
|
B |
| 177 |
THEBEN
IMO 9722302
|
23,786 | 2016 |
15.4
|
C |
| 178 |
MORNING CHAMPION
IMO 9285627
|
21,106 | 2005 |
15.5
|
C |
| 180 |
THALATTA
IMO 9702455
|
23,786 | 2015 |
15.5
|
C |
| 179 |
HOEGH TROVE
IMO 9186302
|
21,200 | 2000 |
15.5
|
C |
| 181 |
TALIA
IMO 9311854
|
21,021 | 2006 |
15.5
|
C |
| 182 |
CRYSTAL RAY
IMO 9210440
|
21,400 | 2000 |
15.5
|
C |
| 183 |
HOEGH TOKYO
IMO 9285483
|
27,100 | 2004 |
15.5
|
C |
| 184 |
UNITED SPIRIT
IMO 9185047
|
14,067 | 2000 |
15.5
|
C |
| 185 |
SIEM CICERO
IMO 9762534
|
17,416 | 2017 |
15.5
|
C |
| 186 |
PRESTIGE ACE
IMO 9213454
|
20,202 | 2000 |
15.6
|
C |
| 187 |
GRACEFUL LEADER
IMO 9357303
|
20,986 | 2007 |
15.6
|
C |
| 188 |
RCC ASIA
IMO 9391581
|
21,037 | 2009 |
15.6
|
C |
| 189 |
HOEGH TRIDENT
IMO 9075709
|
21,423 | 1995 |
15.6
|
C |
| 190 |
TARIFA
IMO 9327748
|
21,120 | 2007 |
15.7
|
C |
| 191 |
AMBER ARROW
IMO 9277826
|
21,120 | 2004 |
15.7
|
C |
| 192 |
ALLIANCE ST. LOUIS
IMO 9285500
|
21,081 | 2005 |
15.7
|
C |
| 193 |
AH SHIN
IMO 9177430
|
21,503 | 1999 |
15.7
|
C |
| 194 |
IGUAZU HIGHWAY
IMO 9827243
|
21,052 | 2018 |
15.7
|
C |
| 195 |
GLOVIS COURAGE
IMO 9651101
|
20,516 | 2013 |
15.7
|
C |
| 196 |
PRECIOUS ACE
IMO 9554200
|
19,045 | 2010 |
15.7
|
C |
| 197 |
MIN JIANG KOU
IMO 9991771
|
19,181 | 2025 |
15.8
|
C |
| 198 |
BLUE ASPIRE
IMO 9968607
|
19,160 | 2024 |
15.8
|
C |
| 200 |
KING QUEST
IMO 9728851
|
18,488 | 2017 |
15.8
|
C |
| 199 |
HOEGH MANILA
IMO 9368912
|
17,252 | 2007 |
15.8
|
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.