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 |
|---|---|---|---|---|---|
| 1301 |
ODOARDO AMORETTI
IMO 9361031
|
15,000 | 2012 |
20.1
|
E |
| 1302 |
MED SERHAT
IMO 9461922
|
8,263 | 2020 |
20.1
|
E |
| 1303 |
GURONI
IMO 9438248
|
9,016 | 2010 |
20.1
|
E |
| 1304 |
VS LARA
IMO 9309148
|
11,276 | 2006 |
20.2
|
E |
| 1305 |
HACI FATMA ANA
IMO 9458195
|
8,424 | 2011 |
20.3
|
E |
| 1306 |
MURRAY STAR
IMO 9527635
|
13,006 | 2011 |
20.3
|
E |
| 1307 |
RYSTRAUM
IMO 9391000
|
9,597 | 2012 |
20.4
|
E |
| 1308 |
MED ANTARCTIC
IMO 9462316
|
8,278 | 2017 |
20.4
|
E |
| 1309 |
DANTE A
IMO 9361029
|
12,100 | 2008 |
20.5
|
E |
| 1310 |
NQ VIOLA
IMO 9354571
|
8,817 | 2006 |
20.5
|
E |
| 1311 |
NIKE
IMO 9431032
|
7,770 | 2009 |
20.5
|
E |
| 1312 |
KATELINA
IMO 9485368
|
8,933 | 2014 |
20.5
|
E |
| 1313 |
TANKER BEE 11
IMO 9356646
|
8,019 | 2007 |
20.6
|
E |
| 1314 |
KARRUCA
IMO 9216470
|
7,721 | 2001 |
20.7
|
E |
| 1315 |
BOTHNIA
IMO 9485356
|
8,985 | 2013 |
20.7
|
E |
| 1316 |
PACIFIC
IMO 9308900
|
8,151 | 2008 |
20.7
|
E |
| 1317 |
HABIP BAYRAK
IMO 9458183
|
8,404 | 2010 |
20.7
|
E |
| 1318 |
BIT ECO
IMO 9786633
|
9,921 | 2017 |
20.8
|
E |
| 1319 |
EFE
IMO 9558763
|
7,623 | 2010 |
20.8
|
E |
| 1320 |
SEAVEN VOYAGER
IMO 9405796
|
6,796 | 2008 |
20.9
|
E |
| 1321 |
IEVOLI SHINE
IMO 9172167
|
9,887 | 1998 |
20.9
|
E |
| 1322 |
LAMENTIN
IMO 9377054
|
11,320 | 2007 |
20.9
|
E |
| 1323 |
GIOCONDA
IMO 9819052
|
7,746 | 2018 |
21.0
|
E |
| 1324 |
GABDULLA TUKAY
IMO 9752498
|
7,056 | 2015 |
21.0
|
E |
| 1325 |
MAYOURY
IMO 9777541
|
9,194 | 2017 |
21.1
|
E |
| 1326 |
HELGA ESSBERGER
IMO 9172155
|
9,887 | 1999 |
21.2
|
E |
| 1327 |
LIA IEVOLI
IMO 9148582
|
9,976 | 1999 |
21.3
|
E |
| 1328 |
MED PAKIZE
IMO 9830604
|
8,219 | 2020 |
21.4
|
E |
| 1329 |
NQ LAELIA
IMO 9393383
|
8,115 | 2008 |
21.6
|
E |
| 1330 |
MED TUNCER
IMO 9830599
|
8,227 | 2019 |
21.6
|
E |
| 1331 |
ROSE PG
IMO 9799032
|
7,420 | 2017 |
21.8
|
E |
| 1332 |
ANTON
IMO 9514456
|
8,402 | 2010 |
21.8
|
E |
| 1333 |
ERICUSA M
IMO 9367372
|
18,000 | 2009 |
22.0
|
E |
| 1334 |
MRC MINA
IMO 9464285
|
7,718 | 2009 |
22.0
|
E |
| 1335 |
ANNETTE ESSBERGER
IMO 9327059
|
11,340 | 2006 |
22.0
|
E |
| 1336 |
FT NERVI
IMO 9447299
|
7,598 | 2009 |
22.1
|
E |
| 1337 |
ROLAND ESSBERGER
IMO 9504217
|
9,124 | 2013 |
22.2
|
E |
| 1338 |
PETROLINA OCEAN
IMO 9460617
|
8,066 | 2009 |
22.2
|
E |
| 1339 |
TUVAQ W.
IMO 9610341
|
7,595 | 2012 |
22.4
|
E |
| 1340 |
MED EMRE
IMO 9461910
|
8,267 | 2019 |
22.4
|
E |
| 1341 |
GISELA ESSBERGER
IMO 9147734
|
9,554 | 1998 |
22.6
|
E |
| 1342 |
CUNO ESSBERGER
IMO 9504190
|
9,156 | 2012 |
22.6
|
E |
| 1343 |
CORAL ESSBERGER
IMO 9504205
|
9,118 | 2012 |
22.7
|
E |
| 1344 |
SWAN BISCAY
IMO 9466532
|
6,711 | 2021 |
22.8
|
E |
| 1345 |
FT QUINTO
IMO 9447304
|
7,599 | 2012 |
22.8
|
E |
| 1346 |
HYDRA
IMO 9837341
|
7,870 | 2019 |
22.9
|
E |
| 1347 |
NQ LILIUM
IMO 9393395
|
8,110 | 2009 |
23.0
|
E |
| 1348 |
SWAN BALTIC
IMO 9466910
|
6,702 | 2008 |
23.1
|
E |
| 1349 |
TOSCA
IMO 9870678
|
7,173 | 2021 |
23.8
|
E |
| 1350 |
MED BALTIC
IMO 9462304
|
8,269 | 2011 |
23.8
|
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 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.