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 |
|---|---|---|---|---|---|
| 1001 |
GRIFFIN T
IMO 9390537
|
10,778 | 2008 |
11.9
|
D |
| 1002 |
STOLT SUN
IMO 9149512
|
22,198 | 2000 |
12.0
|
D |
| 1003 |
SWAN PRIDE
IMO 9806665
|
12,686 | 2017 |
12.0
|
D |
| 1004 |
CARPE DIEM II
IMO 9428815
|
25,175 | 2010 |
12.0
|
D |
| 1005 |
PVT AURORA
IMO 9508938
|
19,991 | 2012 |
12.0
|
D |
| 1006 |
TRISTAR NATASHA
IMO 9721748
|
19,801 | 2016 |
12.0
|
D |
| 1007 |
STOLT SEA
IMO 9149495
|
22,198 | 1999 |
12.0
|
D |
| 1008 |
CHEMICAL RANGER
IMO 9940746
|
14,513 | 2023 |
12.0
|
D |
| 1009 |
GOODAL
IMO 9244374
|
17,396 | 2001 |
12.1
|
D |
| 1010 |
STOLT PERSEVERANCE
IMO 9124471
|
37,059 | 2001 |
12.1
|
D |
| 1011 |
ORIS HELGA
IMO 9483619
|
7,739 | 2008 |
12.1
|
D |
| 1012 |
LATANA
IMO 9186352
|
15,990 | 2000 |
12.1
|
D |
| 1013 |
GULF PETROLEUM 4
IMO 9439345
|
13,006 | 2009 |
12.1
|
D |
| 1014 |
STOLT STREAM
IMO 9169940
|
22,199 | 2000 |
12.1
|
D |
| 1015 |
STOLT INNOVATION
IMO 9102069
|
36,876 | 1996 |
12.1
|
D |
| 1016 |
JULIA THERESA
IMO 9837573
|
12,606 | 2019 |
12.2
|
D |
| 1017 |
STOLT SKUA
IMO 9199311
|
8,594 | 1999 |
12.2
|
D |
| 1018 |
TRANS CHEMICA
IMO 9314715
|
12,430 | 2005 |
12.2
|
D |
| 1019 |
TERNHOLM
IMO 9300829
|
14,825 | 2005 |
12.2
|
D |
| 1020 |
SG FRIENDSHIP
IMO 9288576
|
19,772 | 2003 |
12.3
|
D |
| 1021 |
GABY
IMO 9263136
|
21,183 | 2002 |
12.3
|
D |
| 1022 |
STOLT KASHI
IMO 9266243
|
25,148 | 2003 |
12.3
|
D |
| 1023 |
STOLT HALCON
IMO 9376658
|
12,581 | 2008 |
12.3
|
D |
| 1024 |
SEA MAJESTIC
IMO 9391153
|
19,997 | 2008 |
12.4
|
D |
| 1025 |
SILVER TIGER
IMO 9234680
|
37,383 | 2002 |
12.4
|
D |
| 1026 |
THUN LIFFEY
IMO 9829007
|
18,684 | 2020 |
12.4
|
D |
| 1027 |
ULUS
IMO 9314806
|
37,311 | 2006 |
12.4
|
D |
| 1028 |
ERRIA SWAN
IMO 9347748
|
11,336 | 2006 |
12.4
|
D |
| 1029 |
OLYMPIC FLAME
IMO 9298375
|
20,635 | 2007 |
12.4
|
D |
| 1030 |
KISO
IMO 9379894
|
33,641 | 2008 |
12.4
|
D |
| 1031 |
TRANS CATALONIA
IMO 9176694
|
19,715 | 2000 |
12.4
|
D |
| 1032 |
SCOT FRANKFURT
IMO 9274537
|
8,182 | 2005 |
12.4
|
D |
| 1033 |
THUN LUNDY
IMO 9837872
|
18,684 | 2020 |
12.5
|
D |
| 1034 |
ELISABETH SCHULTE
IMO 9439840
|
16,371 | 2010 |
12.5
|
D |
| 1035 |
ORIENTAL TULIP
IMO 9890549
|
16,268 | 2020 |
12.5
|
D |
| 1036 |
CAESAR
IMO 9235696
|
40,081 | 2002 |
12.5
|
D |
| 1037 |
JBU SAPPHIRE
IMO 9412725
|
19,860 | 2009 |
12.5
|
D |
| 1038 |
NQ FREESIA
IMO 9829772
|
13,029 | 2018 |
12.5
|
D |
| 1039 |
CAN KA
IMO 9312925
|
37,582 | 2006 |
12.6
|
D |
| 1040 |
EDZARD SCHULTE
IMO 9439852
|
16,379 | 2011 |
12.6
|
D |
| 1041 |
UIKKU
IMO 9797814
|
17,500 | 2018 |
12.6
|
D |
| 1042 |
QIKIQTAALUK W.
IMO 9421221
|
19,998 | 2011 |
12.6
|
D |
| 1043 |
EASTERLY BIRDIE
IMO 9423724
|
25,399 | 2009 |
12.6
|
D |
| 1044 |
OWL 4
IMO 9435557
|
13,075 | 2006 |
12.6
|
D |
| 1045 |
FMT EFES
IMO 9427990
|
14,374 | 2007 |
12.6
|
D |
| 1046 |
TRANS TIND
IMO 9594054
|
14,281 | 2010 |
12.7
|
D |
| 1047 |
PVT SUNRISE
IMO 9565742
|
19,805 | 2011 |
12.7
|
D |
| 1048 |
GINGA PUMA
IMO 9343780
|
26,046 | 2006 |
12.7
|
D |
| 1049 |
STOLT VIKING
IMO 9196711
|
26,707 | 2001 |
12.8
|
D |
| 1050 |
GOLDEN OAK
IMO 9445655
|
13,167 | 2008 |
12.8
|
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.