Most Emission-Efficient Chemical Tankers
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 2024. 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 |
|---|---|---|---|---|---|
| 600 |
BOW EXPLORER
IMO 9828211
|
38,235 | 2020 |
8.2
|
C |
| 602 |
MTM SANTOS
IMO 9712606
|
22,396 | 2015 |
8.2
|
C |
| 604 |
MARINER A
IMO 9288954
|
40,099 | 2005 |
8.2
|
C |
| 603 |
CONTI GREENLAND
IMO 9391397
|
37,599 | 2008 |
8.2
|
C |
| 606 |
STOLT PONDO
IMO 9374521
|
33,232 | 2007 |
8.2
|
C |
| 608 |
ATA VOYAGER
IMO 9408360
|
9,531 | 2009 |
8.2
|
C |
| 605 |
GINGA THRESHER
IMO 9829746
|
25,174 | 2019 |
8.2
|
C |
| 607 |
STOLT MAPLE
IMO 9764491
|
32,825 | 2017 |
8.2
|
C |
| 609 |
STOLT SNELAND
IMO 9352212
|
44,080 | 2008 |
8.2
|
C |
| 610 |
MTM PENANG
IMO 9712591
|
22,413 | 2015 |
8.2
|
C |
| 612 |
GOLD TRADER I
IMO 9907017
|
33,343 | 2019 |
8.2
|
C |
| 611 |
STOLT APAL
IMO 9719240
|
32,798 | 2016 |
8.2
|
C |
| 613 |
BOW LYNX
IMO 9989194
|
25,914 | 2024 |
8.2
|
C |
| 615 |
HAFNIA AMAZONITE
IMO 9719769
|
37,596 | 2015 |
8.3
|
C |
| 614 |
EDGE GALAXY
IMO 9788954
|
19,946 | 2017 |
8.3
|
C |
| 616 |
TIVY GOLD
IMO 9251559
|
39,999 | 2003 |
8.3
|
C |
| 617 |
SERENA M
IMO 9444508
|
39,710 | 2010 |
8.3
|
C |
| 619 |
KAMUI GALAXY
IMO 9942653
|
26,400 | 2022 |
8.3
|
C |
| 618 |
JANE
IMO 9364588
|
51,506 | 2008 |
8.3
|
C |
| 620 |
BOW LION
IMO 9952177
|
26,021 | 2023 |
8.3
|
C |
| 621 |
MALBEC LEGEND
IMO 9732814
|
37,596 | 2016 |
8.3
|
C |
| 622 |
HACI KEMAL KA
IMO 9315757
|
37,627 | 2003 |
8.3
|
C |
| 623 |
SC SCORPIO
IMO 9801079
|
40,964 | 2017 |
8.3
|
C |
| 625 |
RAMANDA
IMO 9739812
|
17,994 | 2018 |
8.3
|
C |
| 624 |
POLKA
IMO 9422641
|
37,759 | 2009 |
8.3
|
C |
| 627 |
CHEM STELLAR
IMO 9731755
|
25,196 | 2016 |
8.3
|
C |
| 626 |
KRITI JADE
IMO 9391311
|
50,563 | 2008 |
8.3
|
C |
| 628 |
STOLT FOCUS
IMO 9214305
|
37,467 | 2001 |
8.3
|
C |
| 629 |
FAIRCHEM VALOR
IMO 9791195
|
22,292 | 2019 |
8.3
|
C |
| 630 |
CHEMROUTE PEGASUS
IMO 9566162
|
26,153 | 2012 |
8.3
|
C |
| 634 |
SLOGEN
IMO 9733375
|
19,996 | 2016 |
8.4
|
C |
| 633 |
DIDIMON
IMO 9288772
|
37,432 | 2005 |
8.4
|
C |
| 632 |
FAIRCHEM ANGEL
IMO 9809394
|
25,245 | 2020 |
8.4
|
C |
| 631 |
BOCHEM MUMBAI
IMO 9565637
|
33,636 | 2006 |
8.4
|
C |
| 637 |
VIVA
IMO 9156539
|
16,116 | 1999 |
8.4
|
C |
| 636 |
BOW CARDINAL
IMO 9114244
|
37,446 | 1997 |
8.4
|
C |
| 635 |
FENICUSA M
IMO 9381500
|
40,036 | 2008 |
8.4
|
C |
| 638 |
KRITI ADMIRAL
IMO 9314870
|
37,266 | 2007 |
8.4
|
C |
| 639 |
NAVIG8 UNIVERSE
IMO 9489106
|
45,313 | 2013 |
8.4
|
C |
| 640 |
EALDOR
IMO 9282924
|
20,810 | 2003 |
8.4
|
C |
| 642 |
MTM KOBE
IMO 9776456
|
21,183 | 2018 |
8.4
|
C |
| 641 |
SOLAR AILENE
IMO 9877664
|
25,039 | 2021 |
8.4
|
C |
| 643 |
ANKARA
IMO 9253777
|
40,083 | 2004 |
8.4
|
C |
| 644 |
SOLAR SHARNA
IMO 9877614
|
25,039 | 2020 |
8.4
|
C |
| 645 |
FAIRCHEM PATHFINDER
IMO 9975301
|
26,222 | 2024 |
8.5
|
C |
| 646 |
STOLT TUCAN
IMO 9811127
|
15,081 | 2019 |
8.5
|
C |
| 647 |
BAGHEERA
IMO 9670949
|
39,999 | 2014 |
8.5
|
C |
| 650 |
CB BALTIC
IMO 9851701
|
37,874 | 2020 |
8.5
|
C |
| 649 |
NAVIG8 CONSTELLATION
IMO 9489118
|
45,281 | 2013 |
8.5
|
C |
| 648 |
SEA NIMBUS
IMO 9724544
|
39,999 | 2016 |
8.5
|
C |
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 2024 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.