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 |
|---|---|---|---|---|---|
| 1601 |
EMS LYRA
IMO 9374741
|
4,939 | 2010 |
16.3
|
D |
| 1602 |
IREM KARABEKIR
IMO 8420672
|
4,262 | 1985 |
16.3
|
D |
| 1603 |
DONAU
IMO 9385908
|
8,267 | 2011 |
16.4
|
D |
| 1604 |
KIMBERLY
IMO 9378242
|
7,322 | 2008 |
16.4
|
D |
| 1605 |
SEMSA
IMO 9015424
|
2,381 | 1992 |
16.4
|
D |
| 1606 |
HAGLAND CAPTAIN
IMO 9521356
|
4,699 | 2012 |
16.4
|
D |
| 1607 |
SIDER SONJA
IMO 9432505
|
8,546 | 2008 |
16.4
|
D |
| 1608 |
KIARA
IMO 9342140
|
5,907 | 2007 |
16.4
|
D |
| 1609 |
SMALAND
IMO 9277321
|
7,701 | 2004 |
16.4
|
D |
| 1610 |
BLUE ANTARES
IMO 9346689
|
4,891 | 2008 |
16.4
|
D |
| 1611 |
RIX BALTIC
IMO 9250414
|
4,400 | 2002 |
16.4
|
D |
| 1612 |
LONGVANN
IMO 9548304
|
6,132 | 2011 |
16.4
|
D |
| 1613 |
BEAUTRADER
IMO 9428657
|
7,211 | 2009 |
16.4
|
D |
| 1614 |
TITTERI
IMO 9685085
|
11,815 | 2016 |
16.4
|
D |
| 1615 |
LONGVIK
IMO 9548299
|
6,132 | 2011 |
16.4
|
D |
| 1616 |
ELENI K
IMO 9491903
|
5,203 | 2009 |
16.4
|
D |
| 1617 |
EVA MARIE
IMO 9369071
|
11,121 | 2007 |
16.4
|
D |
| 1618 |
ROCAMAR
IMO 9552056
|
5,234 | 2011 |
16.4
|
D |
| 1619 |
HAV SUND
IMO 9361768
|
4,500 | 2008 |
16.4
|
D |
| 1620 |
HAV MARLIN
IMO 9006954
|
3,036 | 1993 |
16.4
|
D |
| 1621 |
KALLI G.
IMO 9962938
|
3,798 | 2023 |
16.4
|
D |
| 1622 |
FAST SUS
IMO 9136096
|
3,234 | 1996 |
16.4
|
D |
| 1623 |
WILSON PERTH
IMO 9287766
|
5,005 | 2004 |
16.5
|
D |
| 1624 |
BBC AMBER
IMO 9563706
|
14,403 | 2011 |
16.5
|
D |
| 1625 |
URA
IMO 9436252
|
7,502 | 2009 |
16.5
|
D |
| 1626 |
RUHRTAL
IMO 9313682
|
3,707 | 2005 |
16.5
|
D |
| 1627 |
GULF SKY
IMO 8817409
|
3,857 | 1990 |
16.5
|
D |
| 1628 |
KENAN T
IMO 9373199
|
5,408 | 2007 |
16.5
|
D |
| 1629 |
MY ARMONY
IMO 9190365
|
5,047 | 1999 |
16.5
|
D |
| 1630 |
INA LEHMANN
IMO 9805427
|
4,803 | 2017 |
16.5
|
D |
| 1631 |
VELSERDIJK
IMO 9346691
|
4,891 | 2008 |
16.5
|
D |
| 1632 |
PROPUS
IMO 9133757
|
9,387 | 1997 |
16.5
|
D |
| 1633 |
METIN DADAYLI
IMO 9382827
|
5,229 | 2007 |
16.5
|
D |
| 1634 |
AMBER SKY
IMO 9312688
|
5,750 | 2005 |
16.5
|
D |
| 1635 |
OPPLAND
IMO 9505613
|
9,744 | 2011 |
16.5
|
D |
| 1636 |
JADELAND
IMO 9518983
|
5,724 | 2011 |
16.5
|
D |
| 1637 |
SAGASBANK
IMO 9369655
|
4,541 | 2010 |
16.5
|
D |
| 1638 |
JULIETA
IMO 9115913
|
3,370 | 1995 |
16.5
|
D |
| 1639 |
JOHANN
IMO 9534298
|
6,000 | 2012 |
16.5
|
D |
| 1640 |
WESERTAL
IMO 9313668
|
3,789 | 2004 |
16.5
|
D |
| 1641 |
WILSON POLICE
IMO 9373539
|
4,909 | 2007 |
16.5
|
D |
| 1642 |
WISLABORG
IMO 9505560
|
9,698 | 2011 |
16.5
|
D |
| 1643 |
SDS RED
IMO 9365518
|
8,546 | 2010 |
16.5
|
D |
| 1644 |
FLORETGRACHT
IMO 9507611
|
12,067 | 2012 |
16.6
|
D |
| 1645 |
FRISIANA
IMO 9385893
|
8,027 | 2010 |
16.6
|
D |
| 1646 |
FRI KVAM
IMO 9211078
|
4,892 | 2000 |
16.6
|
D |
| 1647 |
BBC BRISBANE
IMO 9578763
|
7,997 | 2012 |
16.6
|
D |
| 1648 |
AMIRA JOY
IMO 9558452
|
8,500 | 2009 |
16.6
|
D |
| 1649 |
MARBELLA
IMO 9406958
|
8,546 | 2008 |
16.6
|
D |
| 1650 |
NATALIE
IMO 9361720
|
4,995 | 2006 |
16.6
|
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.