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 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 |
|---|---|---|---|---|---|
| 1051 |
DOLFIJNGRACHT
IMO 9420825
|
17,967 | 2009 |
13.7
|
C |
| 1052 |
HAPPY DRAGON
IMO 9551961
|
18,103 | 2011 |
13.7
|
C |
| 1053 |
SAXONA
IMO 9371024
|
5,069 | 2006 |
13.7
|
C |
| 1054 |
ONEGO ELBE
IMO 9438573
|
11,087 | 2008 |
13.7
|
C |
| 1057 |
SKY DOLPHIN
IMO 1029039
|
3,802 | 2025 |
13.7
|
C |
| 1056 |
DIAMANTGRACHT
IMO 9420813
|
17,966 | 2009 |
13.7
|
C |
| 1055 |
ANHOLT
IMO 9968205
|
5,217 | 2024 |
13.7
|
C |
| 1058 |
EMS LUNA
IMO 1022275
|
4,672 | 2024 |
13.7
|
C |
| 1060 |
BBC RAINBOW
IMO 9423516
|
18,019 | 2010 |
13.7
|
C |
| 1059 |
NORAN
IMO 9175822
|
8,595 | 1997 |
13.7
|
C |
| 1061 |
FINN II
IMO 9534468
|
10,049 | 2012 |
13.7
|
C |
| 1062 |
HIIUMAA
IMO 9973286
|
5,962 | 2024 |
13.7
|
C |
| 1064 |
NAVIN FALCON
IMO 9492933
|
7,933 | 2008 |
13.8
|
C |
| 1063 |
JUMBO
IMO 8518297
|
3,697 | 1987 |
13.8
|
C |
| 1066 |
FWN STAR
IMO 9721645
|
10,549 | 2015 |
13.8
|
C |
| 1065 |
INDUSTRIAL SONG
IMO 9750464
|
12,292 | 2017 |
13.8
|
C |
| 1067 |
ESL AFRICA
IMO 9397171
|
17,356 | 2007 |
13.8
|
C |
| 1068 |
LADY RUBINA
IMO 9370109
|
13,464 | 2008 |
13.8
|
C |
| 1069 |
DOGGERSBANK
IMO 9341768
|
6,665 | 2006 |
13.8
|
C |
| 1071 |
KATJA
IMO 9454838
|
6,684 | 2009 |
13.8
|
C |
| 1070 |
SLOMAN DISCHARGER
IMO 9463578
|
12,962 | 2011 |
13.8
|
C |
| 1073 |
KAREN C
IMO 9523952
|
6,794 | 2010 |
13.8
|
C |
| 1072 |
SINGELGRACHT
IMO 9197375
|
21,311 | 2000 |
13.8
|
C |
| 1074 |
BIRKHOLM
IMO 9968229
|
5,213 | 2024 |
13.8
|
C |
| 1075 |
BALTIC DREAM
IMO 9969522
|
3,718 | 2025 |
13.8
|
C |
| 1076 |
RESAT AGA
IMO 9545467
|
6,616 | 2009 |
13.8
|
C |
| 1077 |
YANGZE VENUS
IMO 9428401
|
12,094 | 2013 |
13.8
|
C |
| 1081 |
UNISUN
IMO 9448451
|
9,825 | 2009 |
13.8
|
C |
| 1080 |
MY MELODY
IMO 9006382
|
3,713 | 1994 |
13.8
|
C |
| 1079 |
C.ATLAS
IMO 9199141
|
3,683 | 2003 |
13.8
|
C |
| 1078 |
BBC NAGASAKI
IMO 9559872
|
9,717 | 2011 |
13.8
|
C |
| 1082 |
JSP FALSTER
IMO 9968152
|
5,231 | 2023 |
13.8
|
C |
| 1083 |
PENHAR
IMO 9534365
|
6,500 | 2010 |
13.9
|
C |
| 1084 |
AMBER TRADER
IMO 9180853
|
6,320 | 1998 |
13.9
|
C |
| 1085 |
JSP SAMSØ
IMO 9968217
|
5,198 | 2024 |
13.9
|
C |
| 1086 |
SCHIPPERSGRACHT
IMO 9197363
|
21,311 | 2000 |
13.9
|
C |
| 1087 |
BILLIE
IMO 9488047
|
12,696 | 2011 |
13.9
|
C |
| 1088 |
TALI
IMO 9173692
|
13,340 | 1998 |
13.9
|
C |
| 1089 |
SPAARNEGRACHT
IMO 9202558
|
21,311 | 2000 |
13.9
|
C |
| 1092 |
YI HUI REN HAI
IMO 9628685
|
12,312 | 2013 |
13.9
|
C |
| 1091 |
TRANSUND
IMO 9213088
|
16,612 | 2002 |
13.9
|
C |
| 1090 |
ONEGO EMS
IMO 9290074
|
10,683 | 2004 |
13.9
|
C |
| 1094 |
ANNE
IMO 9433365
|
7,594 | 2010 |
13.9
|
C |
| 1093 |
KAREWOOD BRAVE
IMO 9281516
|
6,315 | 2006 |
13.9
|
C |
| 1096 |
LUCITA
IMO 9338113
|
8,577 | 2005 |
13.9
|
C |
| 1095 |
KARINA C
IMO 9558000
|
6,792 | 2010 |
13.9
|
C |
| 1097 |
MARK D
IMO 9969443
|
3,644 | 2024 |
13.9
|
C |
| 1099 |
BOSFOR
IMO 9369083
|
11,121 | 2008 |
14.0
|
C |
| 1098 |
WILSON SAGA
IMO 8918461
|
6,489 | 1998 |
14.0
|
C |
| 1100 |
YM SAMSUN
IMO 9584982
|
8,716 | 2011 |
14.0
|
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 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.