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 |
|---|---|---|---|---|---|
| 1251 |
ELLEN ESSBERGER
IMO 9272747
|
8,571 | 2004 |
18.0
|
E |
| 1252 |
TINERFE
IMO 9498107
|
17,540 | 2009 |
18.0
|
E |
| 1253 |
BASAT
IMO 9447029
|
10,745 | 2008 |
18.1
|
E |
| 1254 |
ORIENTAL ACACIA
IMO 9553048
|
12,332 | 2011 |
18.1
|
E |
| 1255 |
LIESEL ESSBERGER
IMO 9272761
|
8,571 | 2004 |
18.2
|
E |
| 1256 |
GENNARO IEVOLI
IMO 9268631
|
12,004 | 2004 |
18.3
|
E |
| 1257 |
SHANNON STAR
IMO 9503926
|
13,023 | 2010 |
18.3
|
E |
| 1258 |
CHARLOTTE THERESA
IMO 9400708
|
11,403 | 2008 |
18.3
|
E |
| 1259 |
GTM DENMARK
IMO 9528902
|
11,596 | 2011 |
18.4
|
E |
| 1260 |
LASCAUX
IMO 9405746
|
11,674 | 2007 |
18.4
|
E |
| 1261 |
IVER AMBITION
IMO 9439163
|
9,228 | 2009 |
18.4
|
E |
| 1262 |
AC-D
IMO 9428437
|
7,842 | 2008 |
18.4
|
E |
| 1263 |
BASARAN BAYRAK
IMO 9932165
|
8,127 | 2022 |
18.4
|
E |
| 1264 |
MANAS
IMO 9447055
|
10,745 | 2008 |
18.5
|
E |
| 1265 |
GIULIA IEVOLI
IMO 9284439
|
13,776 | 2004 |
18.5
|
E |
| 1266 |
SLOMAN HERAKLES
IMO 9466726
|
16,417 | 2012 |
18.6
|
E |
| 1267 |
SHAMROCK JUPITER
IMO 9416082
|
19,837 | 2009 |
18.6
|
E |
| 1268 |
PLEVNE
IMO 9340908
|
11,321 | 2007 |
18.7
|
E |
| 1269 |
DOMENICO IEVOLI
IMO 9334430
|
10,015 | 2006 |
18.7
|
E |
| 1270 |
W WEST
IMO 9383651
|
8,025 | 2008 |
18.7
|
E |
| 1271 |
TINA THERESA
IMO 9478298
|
7,902 | 2009 |
18.8
|
E |
| 1272 |
AMALIE ESSBERGER
IMO 9314777
|
8,571 | 2005 |
18.8
|
E |
| 1273 |
BLUE BIRD
IMO 9527764
|
9,938 | 2011 |
18.8
|
E |
| 1274 |
NQ ZINNIA
IMO 9150327
|
10,128 | 1998 |
18.9
|
E |
| 1275 |
ALICE THERESA
IMO 9478303
|
7,874 | 2010 |
18.9
|
E |
| 1276 |
NISI
IMO 9328974
|
15,601 | 2005 |
19.0
|
E |
| 1277 |
MED ADRIATIC
IMO 9410662
|
8,269 | 2013 |
19.1
|
E |
| 1278 |
NQ CALIPSO
IMO 9138408
|
10,020 | 1997 |
19.1
|
E |
| 1279 |
CAROLINE ESSBERGER
IMO 9439151
|
8,506 | 2009 |
19.1
|
E |
| 1280 |
LADY ELA
IMO 9511442
|
7,667 | 2009 |
19.2
|
E |
| 1281 |
KARINA THERESA
IMO 9428451
|
7,871 | 2009 |
19.2
|
E |
| 1282 |
SCOT BERLIN
IMO 9255804
|
8,254 | 2003 |
19.2
|
E |
| 1283 |
TRANS EMERALD
IMO 9295452
|
8,650 | 2005 |
19.2
|
E |
| 1284 |
WILHELMINE ESSBERGER
IMO 9295440
|
8,631 | 2005 |
19.3
|
E |
| 1285 |
LISA ESSBERGER
IMO 9295438
|
8,617 | 2005 |
19.3
|
E |
| 1286 |
CATHY THERESA
IMO 9478315
|
7,846 | 2011 |
19.3
|
E |
| 1287 |
GALIASGAR KAMAL
IMO 9820776
|
7,053 | 2018 |
19.4
|
E |
| 1288 |
OLYMPUS
IMO 9310355
|
9,189 | 2006 |
19.4
|
E |
| 1289 |
DUZGIT DIGNITY
IMO 9581019
|
8,488 | 2014 |
19.5
|
E |
| 1290 |
SCANDIC
IMO 9386249
|
11,505 | 2007 |
19.5
|
E |
| 1291 |
AGNES ESSBERGER
IMO 9327047
|
11,340 | 2006 |
19.6
|
E |
| 1292 |
NORDIC
IMO 9438444
|
11,530 | 2008 |
19.6
|
E |
| 1293 |
NEW RANGER
IMO 9328326
|
12,951 | 2007 |
19.7
|
E |
| 1294 |
SPRING
IMO 9416812
|
13,021 | 2009 |
19.7
|
E |
| 1295 |
ARABELLA
IMO 9909247
|
7,703 | 2021 |
19.8
|
E |
| 1296 |
SONGA JADE
IMO 9473925
|
17,604 | 2009 |
19.9
|
E |
| 1297 |
GOLFSTRAUM
IMO 9390991
|
9,595 | 2011 |
19.9
|
E |
| 1298 |
NORDSTRAUM
IMO 9523548
|
9,616 | 2012 |
19.9
|
E |
| 1299 |
NORMA
IMO 9870666
|
7,399 | 2020 |
20.0
|
E |
| 1300 |
ENDO OSTRO
IMO 9393656
|
7,335 | 2008 |
20.0
|
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.