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 |
|---|---|---|---|---|---|
| 701 |
CHEM SCEPTRUM
IMO 9731793
|
27,130 | 2017 |
8.9
|
C |
| 702 |
LIPARI M
IMO 9587817
|
37,583 | 2011 |
8.9
|
C |
| 703 |
KATSUYAMA
IMO 9274678
|
36,809 | 2005 |
8.9
|
C |
| 704 |
NCC YANBU
IMO 9458808
|
45,553 | 2010 |
8.9
|
C |
| 705 |
HAFNIA TORRES
IMO 9729283
|
39,067 | 2016 |
8.9
|
C |
| 706 |
MTM TORTOLA
IMO 9742065
|
22,396 | 2016 |
8.9
|
C |
| 707 |
PACIFICO
IMO 9876830
|
22,554 | 2022 |
8.9
|
C |
| 708 |
DELPHI
IMO 9283796
|
37,432 | 2004 |
8.9
|
C |
| 709 |
MTM SAVANNAH
IMO 9726750
|
22,430 | 2015 |
8.9
|
C |
| 710 |
ARDMORE CHEYENNE
IMO 9707857
|
25,217 | 2013 |
8.9
|
C |
| 711 |
BHARAT
IMO 9253595
|
40,128 | 2003 |
8.9
|
C |
| 712 |
BLUE ROSE
IMO 9335915
|
38,402 | 2007 |
8.9
|
C |
| 713 |
HTM WARRIOR
IMO 9399911
|
50,576 | 2009 |
8.9
|
C |
| 714 |
BERNICE
IMO 9220926
|
42,721 | 2001 |
9.0
|
C |
| 715 |
CHEM RANGER
IMO 9490296
|
26,198 | 2010 |
9.0
|
C |
| 716 |
EK-STREAM
IMO 9808261
|
19,881 | 2018 |
9.0
|
C |
| 717 |
SAKURA BELLE
IMO 9568500
|
26,960 | 2011 |
9.0
|
C |
| 718 |
FAIRCHEM ALDEBARAN
IMO 9552666
|
19,697 | 2017 |
9.0
|
C |
| 719 |
FAIRCHEM TRIUMPH
IMO 9758038
|
22,354 | 2017 |
9.1
|
C |
| 720 |
CHEM NEON
IMO 9815264
|
19,972 | 2018 |
9.1
|
C |
| 721 |
FAIRCHEM SUCCESS
IMO 9758090
|
22,346 | 2017 |
9.1
|
C |
| 722 |
MOUNT EVEREST
IMO 9470985
|
37,817 | 2010 |
9.1
|
C |
| 723 |
PORTARIA
IMO 9464326
|
36,677 | 2010 |
9.1
|
C |
| 724 |
ALFRED N
IMO 9749324
|
25,161 | 2016 |
9.1
|
C |
| 725 |
STOLT TENACITY
IMO 9680102
|
38,907 | 2017 |
9.1
|
C |
| 726 |
EASTERLY CANYON
IMO 9383974
|
36,677 | 2009 |
9.1
|
C |
| 727 |
EASTERLY SIRIUS
IMO 9455052
|
36,677 | 2010 |
9.1
|
C |
| 728 |
BOW JAGUAR
IMO 9989209
|
25,877 | 2024 |
9.1
|
C |
| 729 |
MTM AMSTERDAM
IMO 9776444
|
21,176 | 2018 |
9.2
|
C |
| 730 |
CIELO DI CAPRI
IMO 9717278
|
39,043 | 2016 |
9.2
|
C |
| 731 |
SFL ARUBA
IMO 9919761
|
33,325 | 2022 |
9.2
|
C |
| 732 |
BOURDA
IMO 9252448
|
47,323 | 2003 |
9.2
|
C |
| 733 |
RF STELLA
IMO 9580998
|
19,132 | 2011 |
9.2
|
C |
| 734 |
NOREASTER
IMO 9350642
|
37,412 | 2007 |
9.2
|
C |
| 735 |
PS VANCOUVER
IMO 9379337
|
50,922 | 2007 |
9.2
|
C |
| 736 |
STOLT BISMUTH
IMO 9739290
|
27,570 | 2016 |
9.2
|
C |
| 737 |
TRUST GALAXY
IMO 9860192
|
21,020 | 2019 |
9.2
|
C |
| 738 |
GINGA LIGER
IMO 9893448
|
25,064 | 2021 |
9.2
|
C |
| 739 |
PROSPERO
IMO 9876828
|
22,543 | 2021 |
9.3
|
C |
| 740 |
GINGA OCELOT
IMO 9581423
|
26,063 | 2013 |
9.3
|
C |
| 741 |
STOLT ACER
IMO 9272668
|
29,709 | 2004 |
9.3
|
C |
| 742 |
FAIRCHEM MAKO
IMO 9826574
|
25,169 | 2018 |
9.3
|
C |
| 743 |
ZAGARA
IMO 9231171
|
37,320 | 2002 |
9.3
|
C |
| 744 |
LOYAL
IMO 9345881
|
23,322 | 2006 |
9.3
|
C |
| 745 |
GULF FANATIR
IMO 9359868
|
45,920 | 2008 |
9.3
|
C |
| 746 |
PRABHU PARVATI
IMO 9423621
|
19,918 | 2008 |
9.3
|
C |
| 747 |
CIELO DI GAETA
IMO 9669653
|
39,990 | 2014 |
9.3
|
C |
| 748 |
SFL BONAIRE
IMO 9919773
|
33,338 | 2023 |
9.3
|
C |
| 749 |
GEORGIA
IMO 9302683
|
40,327 | 2006 |
9.3
|
C |
| 750 |
STOLT OCELOT
IMO 9459539
|
23,324 | 2008 |
9.3
|
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.