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 |
|---|---|---|---|---|---|
| 1151 |
GOLDEN OAK
IMO 9445655
|
13,167 | 2008 |
12.9
|
E |
| 1152 |
CHEM ROTTERDAM
IMO 9640140
|
19,804 | 2014 |
12.9
|
E |
| 1153 |
SONGA FALCON
IMO 9396012
|
25,418 | 2009 |
12.9
|
E |
| 1154 |
HANA I
IMO 9340398
|
13,027 | 2007 |
13.0
|
E |
| 1155 |
SWIFT
IMO 9464376
|
37,565 | 2010 |
13.0
|
E |
| 1156 |
CHEMICAL RANGER
IMO 9940746
|
14,513 | 2023 |
13.0
|
E |
| 1157 |
SWAN PRIDE
IMO 9806665
|
12,686 | 2017 |
13.0
|
E |
| 1158 |
ELISABETH SCHULTE
IMO 9439840
|
16,371 | 2010 |
13.1
|
E |
| 1159 |
MTM HOUSTON
IMO 9505924
|
19,741 | 2010 |
13.1
|
E |
| 1160 |
MAVKA
IMO 9284647
|
13,586 | 2004 |
13.1
|
E |
| 1161 |
THRACIA KA
IMO 9493377
|
13,581 | 2008 |
13.1
|
E |
| 1162 |
THE AMIGO
IMO 9492309
|
14,911 | 2012 |
13.1
|
E |
| 1163 |
MOSTRAUM
IMO 9829784
|
10,247 | 2019 |
13.1
|
E |
| 1164 |
BARBOUNI
IMO 9416020
|
19,822 | 2007 |
13.1
|
E |
| 1165 |
STEN SKAGEN
IMO 9460239
|
18,531 | 2009 |
13.1
|
E |
| 1166 |
TATLISU
IMO 9282364
|
8,521 | 2003 |
13.1
|
E |
| 1167 |
HICRI KAAN
IMO 9171474
|
10,378 | 1998 |
13.2
|
E |
| 1168 |
ERIKA SCHULTE
IMO 9439864
|
16,427 | 2011 |
13.2
|
E |
| 1169 |
CHEMICAL VOYAGER
IMO 9330379
|
14,246 | 2005 |
13.3
|
E |
| 1170 |
SWAN DIGNITY
IMO 9806706
|
12,661 | 2017 |
13.3
|
E |
| 1171 |
SAMC SWAN
IMO 9813058
|
8,707 | 2019 |
13.4
|
E |
| 1172 |
JUTLANDIA SWAN
IMO 9736638
|
12,479 | 2015 |
13.4
|
E |
| 1173 |
SLOMAN HERA
IMO 9466714
|
16,426 | 2012 |
13.4
|
E |
| 1174 |
KORSARO
IMO 9373137
|
25,997 | 2008 |
13.5
|
E |
| 1175 |
EVA TOKYO
IMO 9865520
|
19,841 | 2019 |
13.5
|
E |
| 1176 |
VIKSTRAUM
IMO 9829796
|
10,501 | 2019 |
13.5
|
E |
| 1177 |
CAESAR
IMO 9235696
|
40,081 | 2002 |
13.5
|
E |
| 1178 |
XT EXPLORATION
IMO 1043023
|
13,108 | 2024 |
13.5
|
E |
| 1179 |
TRANS TIND
IMO 9594054
|
14,281 | 2010 |
13.5
|
E |
| 1180 |
UIKKU
IMO 9797814
|
17,500 | 2018 |
13.5
|
E |
| 1181 |
LUNNI
IMO 9797802
|
17,500 | 2018 |
13.5
|
E |
| 1182 |
LAGERTHA 1
IMO 9410143
|
19,999 | 2006 |
13.6
|
E |
| 1183 |
OWL 5
IMO 9439357
|
13,062 | 2009 |
13.6
|
E |
| 1184 |
SOLIS
IMO 9276248
|
21,181 | 2003 |
13.6
|
E |
| 1185 |
SAKURA THERESA
IMO 1026776
|
13,139 | 2025 |
13.6
|
E |
| 1186 |
BOMAR HAWK
IMO 9396000
|
25,385 | 2008 |
13.6
|
E |
| 1187 |
DILIGENT STAR
IMO 9222651
|
19,998 | 2000 |
13.7
|
E |
| 1188 |
FT QUARTO
IMO 9447330
|
18,000 | 2012 |
13.8
|
E |
| 1189 |
HEINRICH
IMO 9350757
|
17,998 | 2008 |
13.8
|
E |
| 1190 |
EMMY SCHULTE
IMO 9394519
|
16,669 | 2009 |
13.9
|
E |
| 1191 |
STOLT OCELOT
IMO 9459539
|
23,324 | 2008 |
13.9
|
E |
| 1192 |
EXCELLO
IMO 9308558
|
19,999 | 2008 |
13.9
|
E |
| 1193 |
EVA SCHULTE
IMO 9439826
|
16,621 | 2010 |
13.9
|
E |
| 1194 |
PVT SUNRISE
IMO 9565742
|
19,805 | 2011 |
13.9
|
E |
| 1195 |
CHEMICAL TRAVELLER
IMO 9804851
|
12,522 | 2019 |
14.0
|
E |
| 1196 |
ATLANTIC WIND
IMO 9341316
|
15,652 | 2007 |
14.0
|
E |
| 1197 |
IMERA
IMO 9458066
|
14,391 | 2011 |
14.1
|
E |
| 1198 |
CHEMICAL LUNA
IMO 9521423
|
14,304 | 2008 |
14.1
|
E |
| 1199 |
ARAL
IMO 8125454
|
8,915 | 1982 |
14.2
|
E |
| 1200 |
HARBOUR PIONEER
IMO 9572757
|
19,122 | 2010 |
14.2
|
E |
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.