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 |
|---|---|---|---|---|---|
| 1103 |
BALTIC ANKA
IMO 9986506
|
3,662 | 2024 |
14.0
|
C |
| 1105 |
KIRKE
IMO 9413456
|
8,430 | 2007 |
14.0
|
C |
| 1102 |
MUHSINE K
IMO 9420162
|
4,558 | 2007 |
14.0
|
C |
| 1101 |
YM SAMSUN
IMO 9584982
|
8,716 | 2011 |
14.0
|
C |
| 1104 |
SCOT NAVIGATOR
IMO 9820348
|
3,732 | 2017 |
14.0
|
C |
| 1106 |
MANGEN
IMO 9923308
|
5,048 | 2024 |
14.0
|
C |
| 1107 |
MIRVA VG
IMO 9769116
|
5,019 | 2016 |
14.0
|
C |
| 1108 |
BBC NORFOLK
IMO 9559884
|
9,677 | 2012 |
14.0
|
C |
| 1109 |
INDUSTRIAL URSULA
IMO 9435117
|
12,743 | 2008 |
14.0
|
C |
| 1111 |
BBC RHEIDERLAND
IMO 9614696
|
17,551 | 2013 |
14.0
|
C |
| 1110 |
FRIGG W
IMO 9754410
|
12,247 | 2017 |
14.0
|
C |
| 1114 |
ONEGO BAYOU
IMO 9369069
|
11,087 | 2007 |
14.0
|
C |
| 1113 |
DONAUGRACHT
IMO 9420837
|
17,967 | 2009 |
14.0
|
C |
| 1112 |
MY RHAPSODY
IMO 9280691
|
3,810 | 2006 |
14.0
|
C |
| 1115 |
HAMBURG.HS
IMO 9168403
|
8,889 | 1997 |
14.0
|
C |
| 1116 |
SIGYN W
IMO 9754446
|
12,207 | 2018 |
14.0
|
C |
| 1117 |
PROGRESS
IMO 9371828
|
6,510 | 2009 |
14.0
|
C |
| 1120 |
KARLA C
IMO 9558012
|
6,794 | 2010 |
14.0
|
C |
| 1119 |
BBC WASHINGTON
IMO 9283954
|
12,786 | 2004 |
14.0
|
C |
| 1118 |
UAL HOUSTON
IMO 9542348
|
8,703 | 2012 |
14.0
|
C |
| 1122 |
LADY JASMIN
IMO 9106974
|
11,307 | 1994 |
14.1
|
C |
| 1121 |
DZ YANTAI
IMO 9247405
|
17,539 | 2001 |
14.1
|
C |
| 1123 |
ELA S
IMO 9907378
|
6,362 | 2023 |
14.1
|
C |
| 1124 |
TINA C
IMO 9416331
|
5,525 | 2008 |
14.1
|
C |
| 1125 |
SARDIUS
IMO 9996941
|
3,635 | 2024 |
14.1
|
C |
| 1126 |
ERLE
IMO 9506576
|
5,652 | 2011 |
14.1
|
C |
| 1128 |
SEAWAY K
IMO 9177777
|
13,347 | 1999 |
14.1
|
C |
| 1127 |
KESSU
IMO 9519808
|
5,893 | 2012 |
14.1
|
C |
| 1130 |
AMISOS
IMO 9584994
|
8,716 | 2011 |
14.1
|
C |
| 1129 |
SIF W
IMO 9754434
|
12,237 | 2018 |
14.1
|
C |
| 1131 |
NINA
IMO 9277278
|
5,751 | 2003 |
14.1
|
C |
| 1132 |
TERRAMAR
IMO 9951874
|
5,399 | 2025 |
14.1
|
C |
| 1133 |
BANDURA
IMO 9526071
|
8,217 | 2010 |
14.1
|
C |
| 1134 |
FK HATICE
IMO 8520898
|
5,610 | 1986 |
14.1
|
C |
| 1135 |
BALTIC SPIRIT
IMO 9592678
|
6,562 | 2010 |
14.1
|
C |
| 1136 |
IJSSELBORG
IMO 9456745
|
12,016 | 2010 |
14.1
|
C |
| 1137 |
ALPHA
IMO 9391804
|
4,706 | 2008 |
14.1
|
C |
| 1138 |
ALS
IMO 9968164
|
5,233 | 2023 |
14.1
|
C |
| 1139 |
ONEGO DEUSTO
IMO 9399129
|
9,833 | 2008 |
14.2
|
C |
| 1141 |
ONEGO MERCHANT
IMO 9238363
|
8,930 | 2002 |
14.2
|
C |
| 1142 |
BHG FORTUNE
IMO 9377846
|
11,185 | 2010 |
14.2
|
C |
| 1140 |
EMS MIRA
IMO 9953937
|
3,850 | 2023 |
14.2
|
C |
| 1144 |
AYSSEL
IMO 9155896
|
6,075 | 1997 |
14.2
|
C |
| 1143 |
O7 VEGA S
IMO 9484247
|
9,862 | 2011 |
14.2
|
C |
| 1148 |
MAXIMAR
IMO 9951862
|
5,384 | 2024 |
14.2
|
C |
| 1147 |
BBC NILE
IMO 9571375
|
16,992 | 2011 |
14.2
|
C |
| 1146 |
NIL DEMIR
IMO 8003814
|
4,255 | 1980 |
14.2
|
C |
| 1145 |
ANNA
IMO 9631345
|
8,096 | 2013 |
14.2
|
C |
| 1150 |
HAPPY DIAMOND
IMO 9551947
|
18,148 | 2011 |
14.2
|
C |
| 1149 |
BBC REGALIA
IMO 9539389
|
17,907 | 2012 |
14.2
|
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.