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 |
|---|---|---|---|---|---|
| 101 |
MORNING PILOT
IMO 9669031
|
22,675 | 2014 |
13.6
|
B |
| 102 |
TOSCANA
IMO 9398333
|
22,157 | 2009 |
13.7
|
B |
| 103 |
YUAN JIANG KOU
IMO 9999591
|
19,276 | 2026 |
13.7
|
B |
| 104 |
MORNING CELINE
IMO 9519133
|
22,415 | 2009 |
13.7
|
B |
| 105 |
TRITON LEADER
IMO 9553103
|
22,657 | 2010 |
13.7
|
B |
| 106 |
HOEGH TRACER
IMO 9684990
|
21,983 | 2016 |
13.7
|
B |
| 107 |
CARMEN
IMO 9505027
|
31,143 | 2011 |
13.7
|
B |
| 108 |
GLOVIS SUNLIGHT
IMO 9798416
|
25,225 | 2017 |
13.7
|
B |
| 109 |
AUTO ENERGY
IMO 9736377
|
16,990 | 2016 |
13.7
|
B |
| 111 |
MORNING CREST
IMO 9252204
|
19,927 | 2003 |
13.7
|
B |
| 110 |
BYD JINAN
IMO 9993951
|
25,109 | 2025 |
13.7
|
B |
| 112 |
TANNHAUSER
IMO 9731640
|
24,155 | 2020 |
13.7
|
B |
| 114 |
GOLIATH LEADER
IMO 9357315
|
20,958 | 2008 |
13.8
|
B |
| 113 |
THEBEN
IMO 9722302
|
23,786 | 2016 |
13.8
|
B |
| 115 |
LAKE HERMAN
IMO 9953119
|
19,138 | 2023 |
13.8
|
B |
| 116 |
DAEDALUS LEADER
IMO 9426362
|
21,423 | 2009 |
13.8
|
B |
| 117 |
GRANDE TIANJIN
IMO 9992660
|
21,610 | 2025 |
13.8
|
B |
| 118 |
RIGEL LEADER
IMO 9604940
|
18,884 | 2012 |
13.8
|
B |
| 119 |
TOREADOR
IMO 9375288
|
22,098 | 2008 |
13.8
|
B |
| 120 |
PATRIOT
IMO 9316139
|
22,564 | 2006 |
13.8
|
B |
| 121 |
HOEGH TARGET
IMO 9684976
|
22,068 | 2015 |
13.9
|
B |
| 122 |
HAE SHIN
IMO 9053505
|
17,183 | 1994 |
13.9
|
B |
| 124 |
LEO LEADER
IMO 9181558
|
22,733 | 1999 |
13.9
|
B |
| 123 |
GRAND DOLPHIN
IMO 9279329
|
18,369 | 2004 |
13.9
|
B |
| 126 |
LIBERTY ACE
IMO 9293650
|
19,106 | 2004 |
13.9
|
B |
| 125 |
LAKE QARAOUN
IMO 9946099
|
19,166 | 2025 |
13.9
|
B |
| 127 |
MORNING PEACE
IMO 9780627
|
22,438 | 2017 |
14.0
|
B |
| 128 |
ARTEMIS LEADER
IMO 9355202
|
21,424 | 2008 |
14.0
|
B |
| 129 |
CMA CGM MONZA
IMO 9953808
|
19,204 | 2024 |
14.0
|
B |
| 131 |
PLEIADES LEADER
IMO 9426374
|
21,364 | 2009 |
14.0
|
B |
| 130 |
TORINO
IMO 9398321
|
22,160 | 2009 |
14.0
|
B |
| 132 |
ANJI FOREVER
IMO 1021415
|
24,604 | 2026 |
14.0
|
B |
| 133 |
AUTO ECO
IMO 9736365
|
16,995 | 2016 |
14.0
|
B |
| 134 |
THOR HIGHWAY
IMO 9948164
|
19,210 | 2024 |
14.1
|
B |
| 135 |
AUTO ACHIEVE
IMO 9881304
|
12,413 | 2022 |
14.1
|
B |
| 137 |
GEMINI LEADER
IMO 9519121
|
22,723 | 2009 |
14.1
|
B |
| 136 |
CMA CGM DAYTONA
IMO 9976654
|
19,038 | 2024 |
14.1
|
B |
| 138 |
RCC AMERICA
IMO 9277802
|
21,182 | 2003 |
14.1
|
B |
| 140 |
APOLLON LEADER
IMO 9402706
|
18,758 | 2008 |
14.2
|
B |
| 139 |
TONGALA
IMO 9605786
|
22,585 | 2012 |
14.2
|
B |
| 141 |
LAKE TAZAWA
IMO 9953810
|
19,213 | 2024 |
14.2
|
B |
| 142 |
MARVELOUS ACE
IMO 9293519
|
19,401 | 2006 |
14.2
|
B |
| 143 |
GLORIOUS LEADER
IMO 9357298
|
20,999 | 2007 |
14.3
|
B |
| 146 |
MORNING CHARLOTTE
IMO 9338694
|
22,362 | 2007 |
14.3
|
B |
| 145 |
LAKE ANNECY
IMO 9946063
|
18,969 | 2023 |
14.3
|
B |
| 144 |
ASIAN CAPTAIN
IMO 9158616
|
25,082 | 1998 |
14.3
|
B |
| 147 |
SAIC ANJI SINCERITY
IMO 9973377
|
18,600 | 2024 |
14.3
|
B |
| 148 |
LIBERTY PASSION
IMO 9777888
|
20,352 | 2017 |
14.4
|
B |
| 149 |
MORNING CELESTA
IMO 9336062
|
21,055 | 2008 |
14.4
|
B |
| 150 |
HARMONY LEADER
IMO 9441568
|
20,434 | 2011 |
14.4
|
B |
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.