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 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 |
|---|---|---|---|---|---|
| 751 |
NAEBA GALAXY
IMO 9791169
|
26,196 | 2018 |
8.6
|
C |
| 752 |
MISTRAL WIND
IMO 9907005
|
33,293 | 2022 |
8.6
|
C |
| 753 |
GC SAPPHIRE
IMO 9924924
|
19,993 | 2022 |
8.6
|
C |
| 754 |
BOCHEM BUCEPHALAS
IMO 9760550
|
25,087 | 2017 |
8.6
|
C |
| 755 |
KRITI JADE
IMO 9391311
|
50,563 | 2008 |
8.6
|
C |
| 756 |
BOCHEM GHENT
IMO 9565649
|
33,628 | 2011 |
8.6
|
C |
| 757 |
ESENTEPE
IMO 9247508
|
40,250 | 2004 |
8.6
|
C |
| 758 |
CHEM STELLAR
IMO 9731755
|
25,196 | 2016 |
8.6
|
C |
| 759 |
FAIRCHEM PRESTIGE
IMO 9984261
|
26,300 | 2024 |
8.6
|
C |
| 760 |
MALBEC LEGEND
IMO 9732814
|
37,596 | 2016 |
8.6
|
C |
| 761 |
BOCHEM BRISBANE
IMO 9973315
|
25,000 | 2024 |
8.7
|
C |
| 762 |
SEA ALTUS
IMO 9724570
|
39,999 | 2017 |
8.7
|
C |
| 763 |
EDGE GALAXY
IMO 9788954
|
19,946 | 2017 |
8.7
|
C |
| 764 |
MARIE C
IMO 9749348
|
25,161 | 2014 |
8.7
|
C |
| 765 |
LYDIA KA
IMO 9314844
|
37,258 | 2007 |
8.7
|
C |
| 766 |
ORCHID MADEIRA
IMO 9367401
|
21,205 | 2009 |
8.7
|
C |
| 767 |
OGINO PARK
IMO 9725873
|
19,992 | 2017 |
8.7
|
C |
| 768 |
HAFNIA SOYA
IMO 9729271
|
39,067 | 2015 |
8.7
|
C |
| 769 |
BOW LION
IMO 9952177
|
26,021 | 2023 |
8.7
|
C |
| 770 |
CHEM RANGER
IMO 9490296
|
26,198 | 2010 |
8.7
|
C |
| 771 |
STOLT SYCAMORE
IMO 9198563
|
37,622 | 2000 |
8.7
|
C |
| 772 |
CHEM SPARK
IMO 9731743
|
25,196 | 2016 |
8.8
|
C |
| 773 |
TIVY GOLD
IMO 9251559
|
39,999 | 2003 |
8.8
|
C |
| 774 |
SEASALVIA
IMO 9629550
|
50,660 | 2013 |
8.8
|
C |
| 775 |
PROSPERO
IMO 9876828
|
22,543 | 2021 |
8.8
|
C |
| 776 |
HAKUBA GALAXY
IMO 9804916
|
25,182 | 2021 |
8.8
|
C |
| 777 |
NORDIC MASA
IMO 9451410
|
20,819 | 2009 |
8.8
|
C |
| 778 |
MARINER A
IMO 9288954
|
40,099 | 2005 |
8.8
|
C |
| 779 |
STOLT VISION
IMO 9274329
|
25,147 | 2005 |
8.8
|
C |
| 780 |
CAPELLA
IMO 9278650
|
32,315 | 2003 |
8.8
|
C |
| 781 |
GEORGIA
IMO 9302683
|
40,327 | 2006 |
8.8
|
C |
| 782 |
KATSUYAMA
IMO 9274678
|
36,809 | 2005 |
8.8
|
C |
| 783 |
UOG KORTHI
IMO 9458808
|
45,553 | 2010 |
8.8
|
C |
| 784 |
EVA TRUST
IMO 9986037
|
19,913 | 2025 |
8.8
|
C |
| 785 |
TAKAO GALAXY
IMO 9920069
|
26,374 | 2022 |
8.8
|
C |
| 786 |
LUCKY LADY
IMO 9288796
|
37,432 | 2005 |
8.8
|
C |
| 787 |
SEA STRATUS
IMO 9724556
|
39,999 | 2017 |
8.8
|
C |
| 788 |
SOLAR NESRIN
IMO 9877626
|
25,039 | 2020 |
8.9
|
C |
| 789 |
PRELUDE
IMO 9360439
|
39,988 | 2007 |
8.9
|
C |
| 790 |
ULUS
IMO 9314806
|
37,311 | 2006 |
8.9
|
C |
| 791 |
ARDMORE CHEROKEE
IMO 9707845
|
25,215 | 2015 |
8.9
|
C |
| 792 |
BOW LEOPARD
IMO 9952165
|
26,004 | 2023 |
8.9
|
C |
| 793 |
STOLT KIRI
IMO 9266231
|
19,508 | 2003 |
8.9
|
C |
| 794 |
ORIENTAL IXIA
IMO 9924728
|
16,298 | 2023 |
8.9
|
C |
| 795 |
MOUNT KIBO
IMO 9470997
|
37,843 | 2010 |
9.0
|
C |
| 796 |
SEYCHELLES PRELUDE
IMO 9365623
|
45,680 | 2007 |
9.0
|
C |
| 797 |
CUTLASS GALAXY
IMO 9746164
|
19,985 | 2015 |
9.0
|
C |
| 798 |
STOLT BOBCAT
IMO 9511167
|
23,432 | 2009 |
9.0
|
C |
| 799 |
GINGA PUMA
IMO 9343780
|
26,046 | 2006 |
9.0
|
C |
| 800 |
SEA TRADER
IMO 9742077
|
22,423 | 2016 |
9.0
|
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 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.