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 |
|---|---|---|---|---|---|
| 1201 |
BDP SPIRIT
IMO 9424053
|
15,203 | 2009 |
16.4
|
E |
| 1202 |
ELISALEX SCHULTE
IMO 9439876
|
16,418 | 2011 |
16.4
|
E |
| 1203 |
DUZGIT ENDEAVOUR
IMO 9581007
|
15,995 | 2013 |
16.4
|
E |
| 1204 |
NQ TULIPA
IMO 9312406
|
8,908 | 2004 |
16.4
|
E |
| 1205 |
GALATIA KA
IMO 9265378
|
15,267 | 2003 |
16.5
|
E |
| 1206 |
TERNVIND
IMO 9425356
|
11,258 | 2008 |
16.5
|
E |
| 1207 |
AVIVA
IMO 9410131
|
19,999 | 2008 |
16.6
|
E |
| 1208 |
SATURNUS
IMO 9816529
|
7,998 | 2018 |
16.6
|
E |
| 1209 |
KATTEGAT
IMO 9432866
|
11,299 | 2008 |
16.6
|
E |
| 1210 |
LOKHOLMEN
IMO 9433303
|
16,866 | 2009 |
16.6
|
E |
| 1211 |
MERCURIUS
IMO 9816531
|
7,998 | 2019 |
16.8
|
E |
| 1212 |
SEA DUCK
IMO 9443839
|
12,966 | 2009 |
16.8
|
E |
| 1213 |
BISCAY
IMO 9474450
|
11,161 | 2008 |
16.9
|
E |
| 1214 |
DONIA
IMO 9442914
|
7,702 | 2008 |
16.9
|
E |
| 1215 |
FERICEK
IMO 9125267
|
10,106 | 1996 |
16.9
|
E |
| 1216 |
TELLUS
IMO 9321615
|
9,181 | 2006 |
17.0
|
E |
| 1217 |
BALTIC
IMO 9451226
|
11,253 | 2020 |
17.0
|
E |
| 1218 |
SIGRID THERESA
IMO 9392183
|
8,139 | 2008 |
17.1
|
E |
| 1219 |
FMT URLA
IMO 9458054
|
14,355 | 2010 |
17.1
|
E |
| 1220 |
CHEMICAL VOYAGER
IMO 9330379
|
14,246 | 2005 |
17.1
|
E |
| 1221 |
NQ VICTORIA
IMO 9344174
|
8,824 | 2006 |
17.2
|
E |
| 1222 |
SONGA RUBY
IMO 9444479
|
17,604 | 2008 |
17.2
|
E |
| 1223 |
ATA OCEAN
IMO 9373929
|
9,942 | 2007 |
17.3
|
E |
| 1224 |
KIRKEHOLMEN
IMO 9553402
|
17,136 | 2010 |
17.3
|
E |
| 1225 |
AMUR STAR
IMO 9480368
|
13,019 | 2010 |
17.3
|
E |
| 1226 |
MRC LINA
IMO 9462299
|
8,280 | 2010 |
17.4
|
E |
| 1227 |
SELENKA
IMO 9447067
|
10,745 | 2009 |
17.4
|
E |
| 1228 |
SONGA TAURUS
IMO 9373644
|
16,611 | 2009 |
17.4
|
E |
| 1229 |
LOTSTELLA
IMO 9832121
|
7,988 | 2018 |
17.5
|
E |
| 1230 |
MONJASA HUNTER
IMO 9478286
|
7,858 | 2009 |
17.5
|
E |
| 1231 |
KAPIDAG
IMO 9034731
|
8,674 | 1992 |
17.5
|
E |
| 1232 |
LIVATYA
IMO 9291444
|
8,817 | 2004 |
17.5
|
E |
| 1233 |
WINTER
IMO 9416800
|
13,026 | 2009 |
17.5
|
E |
| 1234 |
ESSEX STAR
IMO 9348297
|
16,744 | 2007 |
17.6
|
E |
| 1235 |
AYSENAZ
IMO 9034743
|
9,108 | 1993 |
17.6
|
E |
| 1236 |
ANNELIESE ESSBERGER
IMO 9295426
|
8,648 | 2005 |
17.6
|
E |
| 1237 |
BERGSTRAUM
IMO 9108740
|
9,494 | 1996 |
17.6
|
E |
| 1238 |
CAROLINE THERESA
IMO 9428449
|
7,884 | 2009 |
17.7
|
E |
| 1239 |
CYAN ORCA
IMO 9542908
|
9,131 | 2007 |
17.7
|
E |
| 1240 |
OWL 3
IMO 9332494
|
13,153 | 2008 |
17.8
|
E |
| 1241 |
SEA LIGHT
IMO 9428023
|
12,948 | 2009 |
17.8
|
E |
| 1242 |
ILHAN BAYRAK
IMO 9956434
|
8,116 | 2023 |
17.8
|
E |
| 1243 |
SONGA AURORA
IMO 9373632
|
16,651 | 2008 |
17.8
|
E |
| 1244 |
JBU OPAL
IMO 9400409
|
19,864 | 2009 |
17.9
|
E |
| 1245 |
TARNBRIS
IMO 9372652
|
11,288 | 2007 |
17.9
|
E |
| 1246 |
SONGA ATLANTIC
IMO 9447328
|
17,999 | 2010 |
17.9
|
E |
| 1247 |
HULIN
IMO 9447043
|
10,745 | 2008 |
17.9
|
E |
| 1248 |
PECHORA STAR
IMO 9488322
|
13,021 | 2011 |
18.0
|
E |
| 1249 |
MONA SWAN
IMO 9371804
|
11,348 | 2006 |
18.0
|
E |
| 1250 |
JETTE THERESA
IMO 9406582
|
11,383 | 2009 |
18.0
|
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.