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 |
|---|---|---|---|---|---|
| 951 |
TG TAURUS
IMO 9523835
|
26,199 | 2011 |
11.4
|
D |
| 952 |
SONGA WINDS
IMO 9416109
|
19,954 | 2009 |
11.4
|
D |
| 953 |
TERNFJORD
IMO 9722405
|
14,848 | 2016 |
11.4
|
D |
| 954 |
SUN 9
IMO 9529645
|
19,992 | 2010 |
11.4
|
D |
| 955 |
THUN LIVERPOOL
IMO 9828998
|
18,684 | 2019 |
11.4
|
D |
| 956 |
CIELO DI ULSAN
IMO 9717266
|
39,060 | 2015 |
11.4
|
D |
| 957 |
CONDOR TRADER
IMO 9742077
|
22,423 | 2016 |
11.5
|
D |
| 958 |
CHEM STREAM
IMO 9479979
|
19,998 | 2010 |
11.5
|
D |
| 959 |
SWAN INDIAN
IMO 9724051
|
19,855 | 2015 |
11.5
|
D |
| 960 |
ANDINO DELTA
IMO 9172210
|
16,028 | 1998 |
11.5
|
D |
| 961 |
JBU ONYX
IMO 9392999
|
19,864 | 2008 |
11.5
|
D |
| 962 |
SAMC SWAN
IMO 9813058
|
8,707 | 2019 |
11.5
|
D |
| 963 |
THERESA II
IMO 9871074
|
19,907 | 2020 |
11.5
|
D |
| 964 |
STOLT INVENTION
IMO 9102100
|
36,733 | 1997 |
11.5
|
D |
| 965 |
AAPUS 11
IMO 9508158
|
19,814 | 2008 |
11.5
|
D |
| 966 |
MISTRAL EXPLORER
IMO 9624770
|
21,323 | 2012 |
11.6
|
D |
| 967 |
NORMAN
IMO 9125279
|
10,022 | 1996 |
11.6
|
D |
| 968 |
SIGAIA THERESA
IMO 9748710
|
12,661 | 2015 |
11.6
|
D |
| 969 |
GINGA KITE
IMO 9228291
|
19,997 | 2001 |
11.6
|
D |
| 970 |
EVA FUJI
IMO 9914242
|
19,891 | 2021 |
11.6
|
D |
| 971 |
ADELAIDE
IMO 9597721
|
21,280 | 2011 |
11.6
|
D |
| 972 |
MAC TOKYO
IMO 9343778
|
19,998 | 2006 |
11.6
|
D |
| 973 |
SCOT FLENSBURG
IMO 9365269
|
8,150 | 2008 |
11.7
|
D |
| 974 |
KOCATEPE
IMO 9274666
|
37,082 | 2005 |
11.7
|
D |
| 975 |
STOLT ACHIEVEMENT
IMO 9124469
|
37,141 | 1999 |
11.7
|
D |
| 976 |
STANLEY PARK
IMO 9363845
|
19,994 | 2008 |
11.7
|
D |
| 977 |
SOLAR ALICE
IMO 9887384
|
24,621 | 2021 |
11.7
|
D |
| 978 |
HAI XING
IMO 9291066
|
16,881 | 2004 |
11.7
|
D |
| 979 |
DS OCEAN
IMO 9330587
|
19,940 | 2007 |
11.7
|
D |
| 980 |
MELATI 6
IMO 9172260
|
31,969 | 2000 |
11.7
|
D |
| 981 |
MAC LONDON
IMO 9296872
|
19,999 | 2003 |
11.7
|
D |
| 982 |
NYMPH THETIS
IMO 9232369
|
17,427 | 2000 |
11.7
|
D |
| 983 |
BALTIC SWIFT
IMO 9464376
|
37,565 | 2010 |
11.7
|
D |
| 984 |
STELLA THERESA
IMO 9594145
|
12,601 | 2011 |
11.7
|
D |
| 985 |
CONTI BENGUELA
IMO 9391373
|
37,652 | 2008 |
11.7
|
D |
| 986 |
MONJASA ROVER
IMO 9271884
|
17,653 | 2004 |
11.8
|
D |
| 987 |
CHEM NEW YORK
IMO 9705732
|
19,994 | 2014 |
11.8
|
D |
| 988 |
TG GEMINI
IMO 9442562
|
25,594 | 2009 |
11.8
|
D |
| 989 |
GINGA LEOPARD
IMO 9425992
|
25,982 | 2008 |
11.8
|
D |
| 990 |
XANTHIA
IMO 9246152
|
17,031 | 2003 |
11.8
|
D |
| 991 |
EVA PEARL
IMO 9985992
|
19,910 | 2024 |
11.8
|
D |
| 992 |
SWAN DIGNITY
IMO 9806706
|
12,661 | 2017 |
11.8
|
D |
| 993 |
GOLDEN RAY
IMO 9640102
|
19,801 | 2012 |
11.8
|
D |
| 994 |
SEA BAZOU
IMO 9391141
|
19,998 | 2008 |
11.9
|
D |
| 995 |
GWEN
IMO 9407067
|
19,702 | 2008 |
11.9
|
D |
| 996 |
LAVRAKI
IMO 9323077
|
20,811 | 2007 |
11.9
|
D |
| 997 |
SLOMAN HESTIA
IMO 9776133
|
16,473 | 2017 |
11.9
|
D |
| 998 |
FURE WEST
IMO 9301873
|
17,349 | 2006 |
11.9
|
D |
| 999 |
SONGA POLARIS
IMO 9457749
|
25,145 | 2011 |
11.9
|
D |
| 1000 |
ERDEK
IMO 9175767
|
10,307 | 1998 |
11.9
|
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 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.