Most Emission-Efficient Container Ships
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 (TEU) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 1701 |
FAYSTON FARMS
IMO 9344552
|
2,490 TEU | 2006 |
12.8
|
D |
| 1702 |
MSC MANASVI II
IMO 9347724
|
1,440 TEU | 2006 |
12.8
|
D |
| 1703 |
MARLA TIGER
IMO 9932933
|
1,984 TEU | 2015 |
12.8
|
D |
| 1704 |
EA NODDY
IMO 9937488
|
1,500 TEU | 2023 |
12.8
|
D |
| 1705 |
TANGER A
IMO 9330939
|
1,440 TEU | 2007 |
12.9
|
D |
| 1706 |
CMA CGM FORT FLEUR D'EPEE
IMO 9809851
|
3,300 TEU | 2019 |
12.9
|
D |
| 1707 |
SPYROS V
IMO 9453365
|
4,250 TEU | 2011 |
12.9
|
D |
| 1708 |
CMA CGM FORT ROYAL
IMO 9809837
|
3,300 TEU | 2019 |
12.9
|
D |
| 1709 |
MSC ACE II
IMO 9309162
|
1,740 TEU | 2005 |
12.9
|
D |
| 1710 |
FERDINANDA S
IMO 9445019
|
1,577 TEU | 2008 |
12.9
|
D |
| 1711 |
ECO OSTRO
IMO 9959565
|
1,170 TEU | 2024 |
12.9
|
D |
| 1712 |
MSC BELLE
IMO 9203904
|
1,098 TEU | 1998 |
12.9
|
D |
| 1713 |
MSC ORTOLAN II
IMO 9401685
|
1,740 TEU | 2009 |
12.9
|
D |
| 1714 |
MEDKON ANKARA
IMO 9248954
|
1,200 TEU | 2003 |
12.9
|
D |
| 1715 |
CONTAINERSHIPS STELLAR
IMO 9866251
|
1,380 TEU | 2021 |
13.0
|
D |
| 1716 |
MSC NIKOLETA II
IMO 9232644
|
1,730 TEU | 2002 |
13.0
|
D |
| 1717 |
BAHRI HOFUF
IMO 9620956
|
364 TEU | 2013 |
13.0
|
D |
| 1718 |
DUBAI TOWER
IMO 9433066
|
1,740 TEU | 2010 |
13.0
|
D |
| 1719 |
MED CESME
IMO 9256365
|
1,740 TEU | 2003 |
13.1
|
D |
| 1720 |
MSC KATALIN II
IMO 9232656
|
1,730 TEU | 2002 |
13.1
|
D |
| 1721 |
CONTAINERSHIPS NORD
IMO 9813993
|
1,368 TEU | 2015 |
13.1
|
D |
| 1722 |
ECO MAESTRO
IMO 9985942
|
13,675 | 2024 |
13.1
|
D |
| 1723 |
MSC SAMU
IMO 9222106
|
2,672 TEU | 2001 |
13.1
|
D |
| 1724 |
KAPTAN AYTAC A
IMO 9242302
|
1,150 TEU | 2001 |
13.1
|
D |
| 1725 |
MICHEL A
IMO 9379349
|
1,604 TEU | 2007 |
13.1
|
D |
| 1726 |
CMA CGM HAMLET
IMO 9763710
|
2,338 TEU | 2016 |
13.2
|
D |
| 1727 |
NILEDUTCH LION
IMO 9337456
|
8,241 TEU | 2008 |
13.2
|
D |
| 1728 |
CMA CGM QUEST
IMO 9734159
|
2,200 TEU | 2017 |
13.2
|
D |
| 1729 |
SONGA WOLF
IMO 9373498
|
1,732 TEU | 2007 |
13.2
|
D |
| 1730 |
SONGA PUMA
IMO 9399789
|
2,750 TEU | 2009 |
13.2
|
D |
| 1731 |
CMA CGM DAVAO
IMO 9347293
|
1,819 TEU | 2008 |
13.2
|
D |
| 1732 |
MSC JIANI
IMO 9966934
|
1,800 TEU | 2023 |
13.2
|
D |
| 1733 |
MSC CALISTA II
IMO 9306067
|
1,574 TEU | 2005 |
13.3
|
D |
| 1734 |
ECO LEVANT
IMO 9985954
|
13,684 | 2024 |
13.3
|
D |
| 1735 |
MED STAR
IMO 9337028
|
1,853 TEU | 2007 |
13.3
|
D |
| 1736 |
CALYPSO
IMO 9550371
|
1,577 TEU | 2010 |
13.3
|
D |
| 1737 |
CMA CGM FORT SAINT CHARLES
IMO 9809849
|
3,300 TEU | 2019 |
13.3
|
D |
| 1738 |
ESSENCE
IMO 9491496
|
1,349 TEU | 2011 |
13.3
|
D |
| 1739 |
SCORPIUS
IMO 9307279
|
2,602 TEU | 2007 |
13.3
|
D |
| 1740 |
SC MONTREAL
IMO 9311830
|
2,478 TEU | 2004 |
13.3
|
D |
| 1741 |
MERATUS JAYAWIJAYA
IMO 9305881
|
2,474 TEU | 2005 |
13.3
|
D |
| 1742 |
BAHRI ABHA
IMO 9620944
|
364 TEU | 2013 |
13.3
|
D |
| 1743 |
MSC AGGELIKI II
IMO 9357846
|
1,732 TEU | 2007 |
13.3
|
D |
| 1744 |
OSLO TRADER
IMO 9817925
|
1,800 TEU | 2019 |
13.4
|
D |
| 1745 |
CMA CGM MAPUTO
IMO 9491628
|
1,740 TEU | 2011 |
13.4
|
D |
| 1746 |
CMA CGM FORT DE FRANCE
IMO 9809825
|
3,300 TEU | 2019 |
13.4
|
D |
| 1747 |
CMA CGM SAHARA
IMO 9220861
|
2,226 TEU | 2002 |
13.4
|
D |
| 1748 |
EVER COZY
IMO 9904510
|
1,809 TEU | 2021 |
13.5
|
D |
| 1749 |
AS ALVA
IMO 9337030
|
1,853 TEU | 2008 |
13.5
|
D |
| 1750 |
CMA CGM NAVEGANTES
IMO 9303780
|
2,824 TEU | 2006 |
13.5
|
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.