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 |
|---|---|---|---|---|---|
| 2051 |
FLUVIUS PLYM
IMO 9163611
|
3,211 | 1998 |
19.8
|
E |
| 2052 |
MULTIMARE
IMO 9143788
|
4,148 | 1997 |
19.8
|
E |
| 2053 |
WILSON CORK
IMO 9178460
|
4,445 | 1998 |
19.8
|
E |
| 2054 |
KAREN
IMO 9487603
|
4,888 | 2008 |
19.9
|
E |
| 2055 |
CAPELLA
IMO 9190171
|
3,792 | 1999 |
19.9
|
E |
| 2056 |
WILSON CALAIS
IMO 9156101
|
4,450 | 2001 |
19.9
|
E |
| 2057 |
WILSON DVINA
IMO 9005742
|
3,269 | 1992 |
19.9
|
E |
| 2058 |
LADY KHADIJA
IMO 8918734
|
7,177 | 1996 |
19.9
|
E |
| 2059 |
WILSON HIRTSHALS
IMO 9240251
|
4,247 | 2001 |
19.9
|
E |
| 2060 |
ANNA LEHMANN
IMO 9225562
|
4,111 | 2000 |
19.9
|
E |
| 2061 |
OCEANIC
IMO 9624550
|
3,000 | 2012 |
19.9
|
E |
| 2062 |
WILSON DAVANGER
IMO 9390111
|
3,783 | 2008 |
19.9
|
E |
| 2063 |
HUMBER SPRINTER
IMO 9467172
|
4,114 | 2009 |
19.9
|
E |
| 2064 |
CLARA K.
IMO 9373321
|
4,285 | 2007 |
19.9
|
E |
| 2065 |
WILSON GRIMSBY
IMO 9056040
|
3,689 | 1993 |
19.9
|
E |
| 2066 |
HUMBER RUNNER
IMO 9467184
|
4,114 | 2010 |
19.9
|
E |
| 2067 |
LISTER
IMO 9155963
|
4,113 | 1997 |
20.0
|
E |
| 2068 |
WILSON ONEGA
IMO 9156199
|
2,517 | 1997 |
20.0
|
E |
| 2069 |
WILMA
IMO 9462744
|
3,794 | 2009 |
20.0
|
E |
| 2070 |
THESEUS
IMO 9199256
|
2,500 | 2000 |
20.0
|
E |
| 2071 |
WILSON DUSAVIK
IMO 9390147
|
3,665 | 2009 |
20.0
|
E |
| 2072 |
NORDIC
IMO 9663001
|
3,000 | 2013 |
20.0
|
E |
| 2073 |
FRANCISCA
IMO 9148166
|
3,250 | 1997 |
20.0
|
E |
| 2074 |
CELLUS
IMO 9173317
|
6,252 | 1998 |
20.0
|
E |
| 2075 |
KARIN LEHMANN
IMO 9225574
|
4,071 | 2000 |
20.1
|
E |
| 2076 |
FORTIUS
IMO 8420701
|
1,753 | 1985 |
20.1
|
E |
| 2077 |
RIX WARRIOR
IMO 9129134
|
4,123 | 1996 |
20.1
|
E |
| 2078 |
BBC ECHO
IMO 9407603
|
10,340 | 2010 |
20.1
|
E |
| 2079 |
NESTOR
IMO 9234305
|
2,500 | 2000 |
20.1
|
E |
| 2080 |
FREBERG
IMO 9030230
|
2,521 | 1992 |
20.1
|
E |
| 2081 |
AST ECO
IMO 9414656
|
3,323 | 2007 |
20.1
|
E |
| 2082 |
HAVELLAND
IMO 9499735
|
6,052 | 2012 |
20.1
|
E |
| 2083 |
WILSON DIEPPE
IMO 9409625
|
3,782 | 2010 |
20.2
|
E |
| 2084 |
WILSON JUPITER
IMO 9411795
|
3,629 | 2021 |
20.2
|
E |
| 2085 |
BARON
IMO 9394210
|
5,229 | 2006 |
20.2
|
E |
| 2086 |
WILSON DUBLIN
IMO 9390109
|
3,778 | 2008 |
20.2
|
E |
| 2087 |
ANASTASIA K III
IMO 8801137
|
3,449 | 1989 |
20.2
|
E |
| 2088 |
FRI SKIEN
IMO 9148192
|
3,714 | 2000 |
20.2
|
E |
| 2089 |
BOSPHORUS QUEEN
IMO 9155901
|
6,067 | 1997 |
20.2
|
E |
| 2090 |
NIKLAS
IMO 9582855
|
3,657 | 2010 |
20.2
|
E |
| 2091 |
WILSON DUNDALK
IMO 9496587
|
3,685 | 2010 |
20.3
|
E |
| 2092 |
VALENTINA
IMO 9195872
|
5,000 | 2000 |
20.3
|
E |
| 2093 |
LADY CLARA
IMO 9375800
|
3,638 | 2007 |
20.3
|
E |
| 2094 |
TAXIARCHIS MICHAIL
IMO 8505941
|
3,810 | 1985 |
20.3
|
E |
| 2095 |
PATRIA
IMO 9123312
|
3,519 | 1995 |
20.3
|
E |
| 2096 |
TC GRACE
IMO 9130236
|
4,221 | 1997 |
20.4
|
E |
| 2097 |
INDUSTRIAL AIM
IMO 9204934
|
6,366 | 1999 |
20.4
|
E |
| 2098 |
BOCS SPIRIT
IMO 9359959
|
12,576 | 2008 |
20.4
|
E |
| 2099 |
COUSINS
IMO 9161156
|
2,185 | 1997 |
20.4
|
E |
| 2100 |
VERTOM EVA
IMO 9507374
|
3,600 | 2010 |
20.4
|
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.