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 |
|---|---|---|---|---|---|
| 901 |
TG LEO
IMO 9640097
|
19,800 | 2012 |
9.8
|
D |
| 902 |
ORIENTAL GERBERA
IMO 9924716
|
16,279 | 2022 |
9.8
|
D |
| 903 |
CIELO DI ULSAN
IMO 9717266
|
39,060 | 2015 |
9.8
|
D |
| 904 |
DAMIANIA
IMO 9308235
|
20,768 | 2006 |
9.8
|
D |
| 905 |
STOLT BASUTO
IMO 9351543
|
25,197 | 2006 |
9.8
|
D |
| 906 |
HTM GRENADIER
IMO 9587829
|
37,583 | 2011 |
9.8
|
D |
| 907 |
MOCKINGBIRD
IMO 9942689
|
19,998 | 2022 |
9.8
|
D |
| 908 |
JBU ONYX
IMO 9392999
|
19,864 | 2008 |
9.8
|
D |
| 909 |
RADIANT RAY
IMO 9749697
|
19,974 | 2018 |
9.8
|
D |
| 910 |
STOLT ILEX
IMO 9505936
|
19,735 | 2010 |
9.8
|
D |
| 911 |
EASTERLY JUPITER
IMO 9383962
|
36,677 | 2009 |
9.8
|
D |
| 912 |
CHEM STREAM
IMO 9479979
|
19,998 | 2010 |
9.8
|
D |
| 913 |
CHEMSTAR SAPPHIRE
IMO 9804904
|
19,993 | 2019 |
9.8
|
D |
| 914 |
CHEM BARCELONA
IMO 9725835
|
19,997 | 2016 |
9.8
|
D |
| 915 |
STOLT PERSEVERANCE
IMO 9124471
|
37,059 | 2001 |
9.9
|
D |
| 916 |
CHEM SPICA
IMO 9739264
|
25,268 | 2017 |
9.9
|
D |
| 917 |
GINGA CARACAL
IMO 9426300
|
25,876 | 2009 |
9.9
|
D |
| 918 |
BOCHEM BAYARD
IMO 9749611
|
25,283 | 2017 |
9.9
|
D |
| 919 |
THUN LIFFEY
IMO 9829007
|
18,684 | 2020 |
9.9
|
D |
| 920 |
GINGA PIONEER
IMO 9965552
|
26,222 | 2023 |
9.9
|
D |
| 921 |
MH SHOGUN
IMO 9986013
|
19,769 | 2025 |
9.9
|
D |
| 922 |
CONTI BENGUELA
IMO 9391373
|
37,652 | 2008 |
9.9
|
D |
| 923 |
BOCHEM NEW ORLEANS
IMO 9973303
|
25,000 | 2024 |
9.9
|
D |
| 924 |
TERN ISLAND
IMO 9909649
|
15,024 | 2021 |
9.9
|
D |
| 925 |
EASTERLY EAGLE
IMO 9423750
|
25,390 | 2010 |
9.9
|
D |
| 926 |
SLOGEN
IMO 9733375
|
19,996 | 2016 |
9.9
|
D |
| 927 |
STOLT INNOVATION
IMO 9102069
|
36,876 | 1996 |
10.0
|
D |
| 928 |
SWAN INDIAN
IMO 9724051
|
19,855 | 2015 |
10.0
|
D |
| 929 |
TERN VIK
IMO 9988970
|
15,016 | 2025 |
10.0
|
D |
| 930 |
SARUS CRANE
IMO 9952127
|
19,772 | 2022 |
10.0
|
D |
| 931 |
CHEM BROADWAY
IMO 9938004
|
33,449 | 2025 |
10.0
|
D |
| 932 |
KOMODO PARK
IMO 9981465
|
19,981 | 2024 |
10.0
|
D |
| 933 |
QD SPRING
IMO 9330460
|
19,870 | 2005 |
10.0
|
D |
| 934 |
BOCHEM LONDON
IMO 9743849
|
19,999 | 2016 |
10.1
|
D |
| 935 |
HALTI
IMO 9818278
|
17,993 | 2019 |
10.1
|
D |
| 936 |
GOBY
IMO 9363833
|
19,994 | 2008 |
10.1
|
D |
| 937 |
STOLT BETULA
IMO 9266267
|
25,023 | 2003 |
10.1
|
D |
| 938 |
AMBER RAY
IMO 9973664
|
21,945 | 2023 |
10.1
|
D |
| 939 |
SOLAR AILENE
IMO 9877664
|
25,039 | 2021 |
10.1
|
D |
| 940 |
GINGA MARITA
IMO 9558402
|
19,909 | 2012 |
10.1
|
D |
| 941 |
GINGA LEOPARD
IMO 9425992
|
25,982 | 2008 |
10.1
|
D |
| 942 |
STOLT SEQUOIA
IMO 9235062
|
37,620 | 2003 |
10.1
|
D |
| 943 |
NORDIC ACE
IMO 9800104
|
16,230 | 2018 |
10.1
|
D |
| 944 |
PRABHU PARVATI
IMO 9423621
|
19,918 | 2008 |
10.1
|
D |
| 945 |
TERN FORS
IMO 9909651
|
15,034 | 2022 |
10.1
|
D |
| 946 |
PRIMO M
IMO 1021685
|
18,669 | 2025 |
10.1
|
D |
| 947 |
MAPLE OCEAN
IMO 1043011
|
13,221 | 2024 |
10.1
|
D |
| 948 |
TONDA
IMO 9274654
|
36,803 | 2005 |
10.1
|
D |
| 949 |
HAI XING
IMO 9291066
|
16,881 | 2004 |
10.1
|
D |
| 950 |
CHEM BARIUM
IMO 9838670
|
19,999 | 2019 |
10.2
|
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.