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 |
|---|---|---|---|---|---|
| 100 |
AUTO ACHIEVE
IMO 9881304
|
12,413 | 2022 |
14.1
|
B |
| 102 |
HOEGH TRIGGER
IMO 9684988
|
22,088 | 2015 |
14.1
|
B |
| 103 |
GUARDIAN LEADER
IMO 9388716
|
21,182 | 2008 |
14.2
|
B |
| 104 |
CENTAURUS LEADER
IMO 9284740
|
21,471 | 2004 |
14.2
|
B |
| 105 |
CMA CGM MONACO
IMO 9946075
|
19,086 | 2024 |
14.2
|
B |
| 106 |
DORADO LEADER
IMO 9308895
|
21,550 | 2006 |
14.2
|
B |
| 107 |
MORNING LENA
IMO 9446001
|
27,295 | 2010 |
14.2
|
B |
| 108 |
MORNING CELINE
IMO 9519133
|
22,415 | 2009 |
14.3
|
B |
| 109 |
GLOVIS SUNLIGHT
IMO 9798416
|
25,225 | 2017 |
14.3
|
B |
| 110 |
GOLD KOCHAV
IMO 9463205
|
22,196 | 2012 |
14.3
|
B |
| 111 |
LYRA LEADER
IMO 9284752
|
21,453 | 2005 |
14.3
|
B |
| 112 |
FUTURE WAY
IMO 9945590
|
18,610 | 2024 |
14.4
|
B |
| 113 |
DEMETER LEADER
IMO 9477921
|
20,019 | 2009 |
14.4
|
B |
| 115 |
MORNING LADY
IMO 9445980
|
27,343 | 2010 |
14.4
|
B |
| 114 |
MORNING PEACE
IMO 9780627
|
22,438 | 2017 |
14.4
|
B |
| 116 |
HOEGH TROOPER
IMO 9075711
|
21,414 | 1995 |
14.4
|
B |
| 117 |
DALIAN HIGHWAY
IMO 9565560
|
21,616 | 2011 |
14.5
|
B |
| 118 |
LAKE ANNECY
IMO 9946063
|
18,969 | 2023 |
14.5
|
B |
| 119 |
HELIOS LEADER
IMO 9476745
|
18,692 | 2009 |
14.5
|
B |
| 120 |
AUTO ENERGY
IMO 9736377
|
16,990 | 2016 |
14.6
|
B |
| 121 |
GLOVIS CORONA
IMO 9122930
|
21,421 | 1996 |
14.6
|
B |
| 122 |
ODIN HIGHWAY
IMO 9948152
|
19,222 | 2024 |
14.6
|
B |
| 124 |
CEPHEUS LEADER
IMO 9308883
|
21,402 | 2006 |
14.6
|
B |
| 123 |
APOLLON LEADER
IMO 9402706
|
18,758 | 2008 |
14.6
|
B |
| 126 |
MORNING LAURA
IMO 9445992
|
27,297 | 2010 |
14.7
|
B |
| 125 |
WAY FORWARD
IMO 9945617
|
18,565 | 2024 |
14.7
|
B |
| 127 |
MORNING CELESTA
IMO 9336062
|
21,055 | 2008 |
14.7
|
B |
| 128 |
ARC HONOR
IMO 9505089
|
28,818 | 2012 |
14.7
|
B |
| 129 |
SAGITTARIUS LEADER
IMO 9283887
|
20,098 | 2005 |
14.7
|
B |
| 130 |
ASIAN TRUST
IMO 9203590
|
21,321 | 1999 |
14.7
|
B |
| 131 |
NOCC ATLANTIC
IMO 9430519
|
22,500 | 2009 |
14.7
|
B |
| 132 |
ASIAN DYNASTY
IMO 9203588
|
21,224 | 1999 |
14.8
|
B |
| 133 |
NIAGARA HIGHWAY
IMO 9832638
|
21,052 | 2019 |
14.8
|
B |
| 134 |
THOR HIGHWAY
IMO 9948164
|
19,210 | 2024 |
14.8
|
B |
| 135 |
TOSCANA
IMO 9398333
|
22,157 | 2009 |
14.8
|
B |
| 136 |
MORNING PRIDE
IMO 9681431
|
22,675 | 2014 |
14.8
|
B |
| 137 |
CAPE TOWN HIGHWAY
IMO 9565558
|
21,676 | 2011 |
14.8
|
B |
| 138 |
GENTLE LEADER
IMO 9391567
|
21,122 | 2008 |
14.8
|
B |
| 140 |
DAEDALUS LEADER
IMO 9426362
|
21,423 | 2009 |
14.8
|
B |
| 139 |
SUPREME ACE
IMO 9610391
|
18,384 | 2011 |
14.8
|
B |
| 142 |
AUTO ADVANCE
IMO 9881299
|
12,457 | 2021 |
14.8
|
B |
| 141 |
MORNING PILOT
IMO 9669031
|
22,675 | 2014 |
14.8
|
B |
| 143 |
MORNING CORNELIA
IMO 9519145
|
22,530 | 2010 |
14.8
|
B |
| 144 |
SERENITY HIGHWAY
IMO 9391579
|
21,004 | 2008 |
14.8
|
B |
| 146 |
HERMES LEADER
IMO 9690535
|
20,941 | 2015 |
14.8
|
B |
| 145 |
GRAND MARK
IMO 9228306
|
20,670 | 2000 |
14.8
|
B |
| 147 |
LEO LEADER
IMO 9181558
|
22,733 | 1999 |
14.9
|
B |
| 148 |
VENUS LEADER
IMO 9392341
|
15,031 | 2010 |
14.9
|
B |
| 149 |
MORNING PROSPERITY
IMO 9780639
|
22,438 | 2017 |
15.0
|
B |
| 150 |
HESTIA LEADER
IMO 9355226
|
21,419 | 2008 |
15.0
|
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 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.