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 |
|---|---|---|---|---|---|
| 2101 |
EIDSVAAG SIRIUS
IMO 9279044
|
3,200 | 2006 |
20.4
|
E |
| 2102 |
SKAGENBANK
IMO 9313864
|
4,500 | 2005 |
20.4
|
E |
| 2103 |
IBERICA HAV
IMO 9210012
|
2,219 | 1999 |
20.5
|
E |
| 2104 |
HAV FELLI
IMO 9197454
|
3,710 | 2005 |
20.5
|
E |
| 2105 |
CONSTANTINE
IMO 9626716
|
12,502 | 2012 |
20.5
|
E |
| 2106 |
HAV FRAKT
IMO 9280706
|
3,710 | 2005 |
20.5
|
E |
| 2107 |
KERDA
IMO 9289790
|
4,874 | 2004 |
20.5
|
E |
| 2108 |
ANTJE K.
IMO 9198630
|
4,247 | 2002 |
20.5
|
E |
| 2109 |
FALKFJORD
IMO 9141364
|
4,748 | 1998 |
20.6
|
E |
| 2110 |
PERA
IMO 9454216
|
6,199 | 2009 |
20.6
|
E |
| 2111 |
WILSON THAMES
IMO 9177894
|
2,500 | 2000 |
20.6
|
E |
| 2112 |
EIDSVAAG VEGA
IMO 9356854
|
3,704 | 2007 |
20.6
|
E |
| 2113 |
WILSON CAEN
IMO 9173290
|
4,452 | 1998 |
20.6
|
E |
| 2114 |
MADICKEN
IMO 9195755
|
3,785 | 2001 |
20.6
|
E |
| 2115 |
PRIMA DONNA
IMO 8609606
|
3,533 | 1987 |
20.6
|
E |
| 2116 |
WILSON DUNDEE
IMO 9390159
|
3,667 | 2009 |
20.7
|
E |
| 2117 |
ORIS PRINCESS
IMO 9119907
|
4,999 | 1994 |
20.7
|
E |
| 2118 |
RMS RATINGEN
IMO 9249831
|
2,644 | 2002 |
20.7
|
E |
| 2119 |
STEENBANK
IMO 9313876
|
4,500 | 2005 |
20.7
|
E |
| 2120 |
WILSON DUNMORE
IMO 9383924
|
3,666 | 2007 |
20.7
|
E |
| 2121 |
MEIKE-B
IMO 9557379
|
2,580 | 2013 |
20.7
|
E |
| 2122 |
WILSON LIVERPOOL
IMO 9617296
|
3,799 | 2011 |
20.7
|
E |
| 2123 |
ELENA
IMO 9313644
|
2,928 | 2005 |
20.8
|
E |
| 2124 |
WAJIH H
IMO 9008093
|
6,311 | 1992 |
20.8
|
E |
| 2125 |
SANTA HELENA
IMO 9617325
|
3,800 | 2012 |
20.8
|
E |
| 2126 |
JOHANNA HELENA
IMO 9372212
|
6,605 | 2011 |
20.8
|
E |
| 2127 |
RIX CRYSTAL
IMO 9050125
|
3,818 | 1993 |
20.8
|
E |
| 2128 |
AMADEUS AMETHIST
IMO 9223435
|
2,626 | 2000 |
20.8
|
E |
| 2129 |
LADY JASMINE
IMO 8131336
|
6,021 | 1984 |
20.8
|
E |
| 2130 |
EMS COURAGE
IMO 9556818
|
2,610 | 2010 |
20.9
|
E |
| 2131 |
SAOURA
IMO 9557800
|
9,095 | 2012 |
20.9
|
E |
| 2132 |
GT FORSETI
IMO 9041320
|
3,602 | 1993 |
20.9
|
E |
| 2133 |
JULIA-B
IMO 9119634
|
2,423 | 1995 |
20.9
|
E |
| 2134 |
SCHELDEBANK
IMO 9439474
|
4,539 | 2007 |
20.9
|
E |
| 2135 |
ARISTONA
IMO 9536052
|
3,799 | 2011 |
21.0
|
E |
| 2136 |
HAV NES
IMO 8719097
|
3,080 | 1991 |
21.0
|
E |
| 2137 |
POZONI
IMO 9518426
|
4,705 | 2010 |
21.0
|
E |
| 2138 |
WILSON DOVER
IMO 9005754
|
3,269 | 1993 |
21.0
|
E |
| 2139 |
FRI SEA
IMO 9229166
|
3,676 | 2001 |
21.0
|
E |
| 2140 |
WILSON FLUSHING
IMO 9491745
|
4,795 | 2012 |
21.0
|
E |
| 2141 |
WILSON DURNESS
IMO 9390135
|
3,689 | 2008 |
21.0
|
E |
| 2142 |
HELEN ANNA
IMO 9582867
|
3,650 | 2010 |
21.1
|
E |
| 2143 |
CATANIA
IMO 9556832
|
2,595 | 2012 |
21.1
|
E |
| 2144 |
SILVAMAR
IMO 9313773
|
4,537 | 2004 |
21.1
|
E |
| 2145 |
WILSON FINNFJORD
IMO 9491769
|
4,722 | 2012 |
21.1
|
E |
| 2146 |
BALTICA HAV
IMO 8415665
|
1,762 | 1984 |
21.1
|
E |
| 2147 |
CARLOW
IMO 9127162
|
4,125 | 1995 |
21.1
|
E |
| 2148 |
BROUWERSGRACHT
IMO 9896270
|
14,535 | 2023 |
21.1
|
E |
| 2149 |
LUNA-B
IMO 9066045
|
2,300 | 1993 |
21.2
|
E |
| 2150 |
WILSON TWISTEDEN
IMO 9195468
|
2,655 | 2002 |
21.2
|
E |
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.