Most Emission-Efficient General Cargos
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 |
|---|---|---|---|---|---|
| 901 |
ONEGO EMS
IMO 9290074
|
10,683 | 2004 |
14.4
|
D |
| 902 |
LUCITA
IMO 9338113
|
8,577 | 2005 |
14.4
|
D |
| 903 |
VAASABORG
IMO 9196242
|
9,567 | 2000 |
14.4
|
D |
| 904 |
ONEGO RIO
IMO 9258985
|
10,300 | 2003 |
14.4
|
D |
| 905 |
SIDER VULCANO
IMO 9486312
|
8,108 | 2010 |
14.4
|
D |
| 906 |
PASILA
IMO 9113018
|
13,367 | 1995 |
14.4
|
D |
| 907 |
SPUIGRACHT
IMO 9202534
|
21,448 | 2001 |
14.5
|
D |
| 908 |
GOLDEN LION
IMO 9363974
|
6,315 | 2006 |
14.5
|
D |
| 909 |
SIDER BILBAO
IMO 9338151
|
14,184 | 2007 |
14.5
|
D |
| 910 |
VEERSEBORG
IMO 9184653
|
8,667 | 1998 |
14.5
|
D |
| 911 |
KAROLIINA
IMO 9381380
|
8,379 | 2008 |
14.5
|
D |
| 912 |
GITO
IMO 9428152
|
8,139 | 2007 |
14.5
|
D |
| 913 |
FWN SOLIDE
IMO 9321093
|
11,541 | 2006 |
14.5
|
D |
| 914 |
BBC PERU
IMO 9549592
|
13,537 | 2012 |
14.5
|
D |
| 915 |
GEMINI MAESTRO
IMO 9350006
|
7,448 | 2007 |
14.6
|
D |
| 916 |
FRISIAN OCTA
IMO 9526095
|
8,284 | 2010 |
14.6
|
D |
| 917 |
MARIETJE ANDREA
IMO 9361134
|
8,493 | 2009 |
14.6
|
D |
| 918 |
DIAMANTGRACHT
IMO 9420813
|
17,966 | 2009 |
14.6
|
D |
| 919 |
MAGPIE S
IMO 9188922
|
10,335 | 2007 |
14.6
|
D |
| 920 |
MEHMET AGA
IMO 8914312
|
9,169 | 1989 |
14.7
|
D |
| 921 |
TONY STARK
IMO 9046423
|
15,346 | 1993 |
14.7
|
D |
| 922 |
SEA ENDURANCE
IMO 9516179
|
9,762 | 2012 |
14.7
|
D |
| 923 |
FWN SEA
IMO 9721657
|
10,544 | 2016 |
14.7
|
D |
| 924 |
WESERBORG
IMO 9505558
|
9,685 | 2011 |
14.7
|
D |
| 925 |
SITHONIA II
IMO 9455571
|
8,790 | 2007 |
14.7
|
D |
| 926 |
MANASSA MIRA M
IMO 9081992
|
8,929 | 1997 |
14.8
|
D |
| 927 |
IRENA
IMO 9306380
|
8,153 | 2005 |
14.8
|
D |
| 928 |
JUNO
IMO 9421154
|
8,265 | 2009 |
14.8
|
D |
| 929 |
TIMBER NAVIGATOR
IMO 9532824
|
8,289 | 2011 |
14.8
|
D |
| 930 |
TRENT NAVIGATOR
IMO 9631369
|
8,102 | 2013 |
14.8
|
D |
| 931 |
ARGO
IMO 9421128
|
8,265 | 2009 |
14.8
|
D |
| 932 |
SEA EXPLORER
IMO 9516155
|
9,736 | 2012 |
14.8
|
D |
| 933 |
FWN ATLANTIDE
IMO 9535620
|
10,872 | 2011 |
14.8
|
D |
| 934 |
BORE WAVE
IMO 9892896
|
6,747 | 2022 |
14.8
|
D |
| 935 |
AZOV COAST
IMO 9387736
|
10,244 | 2007 |
14.8
|
D |
| 936 |
AK GLORIOUS
IMO 9362657
|
8,057 | 2006 |
14.9
|
D |
| 937 |
SINAA
IMO 9081318
|
12,760 | 1994 |
14.9
|
D |
| 938 |
FROLAND
IMO 9505584
|
9,692 | 2011 |
14.9
|
D |
| 939 |
NORDIC KYLIE
IMO 9357999
|
12,791 | 2005 |
14.9
|
D |
| 940 |
DOMINICA
IMO 9232204
|
13,022 | 2001 |
14.9
|
D |
| 941 |
KARSOY
IMO 9555618
|
11,259 | 2009 |
14.9
|
D |
| 942 |
SEA PROSPECT
IMO 9516143
|
9,735 | 2012 |
14.9
|
D |
| 943 |
BOHWA TSINGTAO
IMO 9623192
|
8,952 | 2011 |
15.0
|
D |
| 944 |
ATALAYA TMA
IMO 9369291
|
7,353 | 2008 |
15.0
|
D |
| 945 |
TANGO RIO
IMO 9205718
|
9,231 | 2000 |
15.0
|
D |
| 946 |
FORTUNAGRACHT
IMO 9507609
|
12,094 | 2012 |
15.0
|
D |
| 947 |
AYITA
IMO 9290048
|
10,384 | 2004 |
15.0
|
D |
| 948 |
GOLDEN ROSE
IMO 8801620
|
9,594 | 1989 |
15.1
|
D |
| 949 |
NORJARL
IMO 9436264
|
7,365 | 2009 |
15.1
|
D |
| 950 |
MOEZELBORG
IMO 9180839
|
9,732 | 1999 |
15.1
|
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 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.