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 |
|---|---|---|---|---|---|
| 1701 |
SCOT CARRIER
IMO 9841782
|
4,789 | 2018 |
17.0
|
D |
| 1702 |
JSP VENTO
IMO 9570656
|
7,930 | 2011 |
17.0
|
D |
| 1703 |
RIX AMBER
IMO 9171101
|
3,675 | 1998 |
17.0
|
D |
| 1704 |
CLAIRE
IMO 9556301
|
4,450 | 2013 |
17.0
|
D |
| 1705 |
INDUSTRIAL CONSTANT
IMO 9810343
|
8,396 | 2018 |
17.0
|
D |
| 1706 |
KATI
IMO 9173214
|
5,145 | 1998 |
17.0
|
D |
| 1707 |
POOLGRACHT
IMO 9448360
|
19,382 | 2011 |
17.0
|
D |
| 1708 |
KAMILLA
IMO 9427081
|
7,351 | 2007 |
17.1
|
D |
| 1709 |
BBC PEARL
IMO 9504786
|
14,418 | 2012 |
17.1
|
D |
| 1710 |
FEED STAVANGER
IMO 9155951
|
4,666 | 1997 |
17.1
|
D |
| 1711 |
ARKLOW VALE
IMO 9772527
|
5,158 | 2015 |
17.1
|
D |
| 1712 |
ARKLOW VALIANT
IMO 9772541
|
5,169 | 2016 |
17.1
|
D |
| 1713 |
KAILI
IMO 9114737
|
4,955 | 1996 |
17.1
|
D |
| 1714 |
BBC DAKOTA
IMO 9388900
|
12,685 | 2008 |
17.1
|
D |
| 1715 |
KAROLI
IMO 9180841
|
5,727 | 1998 |
17.1
|
D |
| 1716 |
ADRIATIC
IMO 9944871
|
4,514 | 2022 |
17.1
|
D |
| 1717 |
DAIANA
IMO 9610509
|
8,546 | 2011 |
17.1
|
D |
| 1718 |
SUAT KARABEKIR
IMO 9391452
|
6,568 | 2008 |
17.1
|
D |
| 1719 |
BBC LAGOS
IMO 9570668
|
7,960 | 2012 |
17.1
|
D |
| 1720 |
PHANTOM
IMO 9226712
|
4,500 | 2000 |
17.1
|
D |
| 1721 |
GOTLAND
IMO 9411824
|
3,577 | 2012 |
17.1
|
D |
| 1722 |
SULA
IMO 9006306
|
3,713 | 1992 |
17.1
|
D |
| 1723 |
WILSON LEER
IMO 9150482
|
3,875 | 1996 |
17.2
|
D |
| 1724 |
LEONID LEONOV
IMO 9057276
|
2,800 | 1995 |
17.2
|
D |
| 1725 |
KAURI
IMO 9173226
|
5,145 | 1998 |
17.2
|
D |
| 1726 |
VALMIERA
IMO 8203660
|
7,782 | 1982 |
17.2
|
D |
| 1727 |
LADY EVA
IMO 9008110
|
6,559 | 1992 |
17.2
|
D |
| 1728 |
MANISA BELLA / LENNEBORG
IMO 9421075
|
8,117 | 2008 |
17.2
|
D |
| 1729 |
ROVA STONES
IMO 9387310
|
3,850 | 2008 |
17.2
|
D |
| 1730 |
OCEAN LEGEND
IMO 9083225
|
5,248 | 1992 |
17.2
|
D |
| 1731 |
WILSON HALSVIK
IMO 9017422
|
4,280 | 2001 |
17.2
|
D |
| 1732 |
KAILEEN
IMO 9229049
|
6,358 | 2001 |
17.2
|
D |
| 1733 |
ENDURANCE
IMO 9647318
|
7,825 | 2012 |
17.2
|
D |
| 1734 |
MAIKE
IMO 8905115
|
2,339 | 1989 |
17.2
|
D |
| 1735 |
BBC LISBON
IMO 9513634
|
7,844 | 2011 |
17.2
|
D |
| 1736 |
RIX SAIL
IMO 9114713
|
4,216 | 1994 |
17.2
|
D |
| 1737 |
EMS LAKE
IMO 9978913
|
4,400 | 2024 |
17.2
|
D |
| 1738 |
SEA EXPLORER
IMO 8603547
|
5,528 | 1986 |
17.2
|
D |
| 1739 |
AMADEUS GOLD
IMO 9479565
|
2,567 | 2010 |
17.3
|
D |
| 1740 |
WARNOWBORG
IMO 9505572
|
9,648 | 2011 |
17.3
|
D |
| 1741 |
ARKLOW VANGUARD
IMO 9772577
|
5,168 | 2017 |
17.3
|
D |
| 1742 |
ACEROMAR
IMO 9552082
|
5,235 | 2012 |
17.3
|
D |
| 1743 |
KAATA
IMO 9184823
|
5,049 | 1999 |
17.3
|
D |
| 1744 |
AMADEUS SMARAGD
IMO 9267704
|
3,155 | 2003 |
17.3
|
D |
| 1745 |
BALTIC TRANSPORT
IMO 9864760
|
3,812 | 2021 |
17.3
|
D |
| 1746 |
SCOT RANGER
IMO 9851220
|
4,782 | 2021 |
17.3
|
D |
| 1747 |
ARKLOW GRACE
IMO 9874117
|
5,150 | 2024 |
17.3
|
D |
| 1748 |
ZEKO Y
IMO 8027573
|
8,528 | 1981 |
17.3
|
D |
| 1749 |
FAROMAR
IMO 9552070
|
5,234 | 2012 |
17.3
|
D |
| 1750 |
LISA LEHMANN
IMO 9325130
|
4,507 | 2004 |
17.3
|
D |
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.