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 |
|---|---|---|---|---|---|
| 2001 |
CELTIC RAIDER
IMO 9361330
|
4,535 | 2007 |
19.2
|
E |
| 2002 |
SPANACO PROGRESS
IMO 9306433
|
7,601 | 2007 |
19.2
|
E |
| 2003 |
DANITA
IMO 9341108
|
7,018 | 2005 |
19.2
|
E |
| 2004 |
AURUM
IMO 9248552
|
16,558 | 2004 |
19.2
|
E |
| 2005 |
WILSON HUSUM
IMO 9017379
|
4,219 | 1998 |
19.2
|
E |
| 2006 |
HAGLAND SAGA
IMO 9238404
|
4,530 | 2003 |
19.2
|
E |
| 2007 |
FRI PORSGRUNN
IMO 9196199
|
3,780 | 2000 |
19.3
|
E |
| 2008 |
BERS
IMO 9044188
|
3,712 | 1992 |
19.3
|
E |
| 2009 |
MAI LEHMANN
IMO 9196175
|
4,135 | 1999 |
19.3
|
E |
| 2010 |
DIEZEBORG
IMO 9225586
|
8,819 | 2000 |
19.3
|
E |
| 2011 |
BBC BERGEN
IMO 9437153
|
8,000 | 2011 |
19.3
|
E |
| 2012 |
TITAN PEARL
IMO 9589217
|
6,522 | 2010 |
19.3
|
E |
| 2013 |
MEMNUNE K
IMO 9576703
|
4,488 | 2010 |
19.3
|
E |
| 2014 |
WILSON HANSA
IMO 9583859
|
4,616 | 2013 |
19.3
|
E |
| 2015 |
SELENE PRAHM
IMO 9100059
|
2,422 | 1994 |
19.3
|
E |
| 2016 |
MAUREEN S
IMO 8707783
|
3,999 | 1987 |
19.3
|
E |
| 2017 |
SAFFET AGA
IMO 9376282
|
3,738 | 2007 |
19.3
|
E |
| 2018 |
MIA MARIA
IMO 9518218
|
3,748 | 2012 |
19.3
|
E |
| 2019 |
KRISLIN
IMO 9312377
|
5,208 | 2005 |
19.3
|
E |
| 2020 |
ABERDEEN
IMO 9313723
|
3,614 | 2009 |
19.3
|
E |
| 2021 |
WILSON ODRA
IMO 9177882
|
2,455 | 1999 |
19.4
|
E |
| 2022 |
ARINDA JOY
IMO 9512422
|
8,072 | 2009 |
19.4
|
E |
| 2023 |
ANTWERP
IMO 9375848
|
3,600 | 2008 |
19.4
|
E |
| 2024 |
NYSTEIN
IMO 9137284
|
2,489 | 1995 |
19.4
|
E |
| 2025 |
ELENA L
IMO 9195901
|
4,956 | 2001 |
19.4
|
E |
| 2026 |
INCRA
IMO 9195858
|
5,000 | 2000 |
19.4
|
E |
| 2027 |
KATARIINA
IMO 9467213
|
4,114 | 2011 |
19.4
|
E |
| 2028 |
OSTERBOTTEN
IMO 9247120
|
5,880 | 2002 |
19.5
|
E |
| 2029 |
INANDI
IMO 8332100
|
3,465 | 1984 |
19.5
|
E |
| 2030 |
COE MIEKE
IMO 8912481
|
2,172 | 1990 |
19.5
|
E |
| 2031 |
MAJ RICHARD WINTERS
IMO 9210309
|
7,725 | 2000 |
19.5
|
E |
| 2032 |
BAL BULK
IMO 8912493
|
2,165 | 1990 |
19.5
|
E |
| 2033 |
LUISA
IMO 9471616
|
17,113 | 2008 |
19.6
|
E |
| 2034 |
BENIGANE
IMO 9455600
|
11,818 | 2008 |
19.6
|
E |
| 2035 |
WILSON WISLA
IMO 9156175
|
2,517 | 1996 |
19.6
|
E |
| 2036 |
KEIT
IMO 9333450
|
4,508 | 2005 |
19.6
|
E |
| 2037 |
TURGUT SAHIN
IMO 9135858
|
4,287 | 1997 |
19.6
|
E |
| 2038 |
MUSTAFA YAGCI
IMO 9314545
|
5,874 | 2006 |
19.6
|
E |
| 2039 |
UNITY ONE
IMO 9344409
|
4,264 | 2006 |
19.6
|
E |
| 2040 |
NORMAN
IMO 9361342
|
4,536 | 2007 |
19.6
|
E |
| 2041 |
ADRIATA
IMO 9005376
|
5,697 | 1992 |
19.6
|
E |
| 2042 |
VERTOM ISA
IMO 9507362
|
3,586 | 2010 |
19.7
|
E |
| 2043 |
ASG PORTOFINO
IMO 9229087
|
7,796 | 2002 |
19.7
|
E |
| 2044 |
WERRATAL
IMO 9192636
|
4,443 | 2001 |
19.7
|
E |
| 2045 |
RONJA
IMO 9434046
|
4,500 | 2008 |
19.7
|
E |
| 2046 |
TC GLORY
IMO 9125700
|
4,245 | 1996 |
19.7
|
E |
| 2047 |
GLEN
IMO 9125061
|
4,431 | 1996 |
19.7
|
E |
| 2048 |
WILSON DRAMMEN
IMO 9390094
|
3,671 | 2007 |
19.8
|
E |
| 2049 |
ENNY
IMO 7926409
|
4,632 | 1980 |
19.8
|
E |
| 2050 |
INDUSTRIAL CONFIDENCE
IMO 9810331
|
8,406 | 2018 |
19.8
|
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.