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 |
|---|---|---|---|---|---|
| 201 |
STI MARSHALL
IMO 9833565
|
49,999 | 2019 |
5.7
|
A |
| 202 |
MARITIME VALOR
IMO 9848352
|
49,998 | 2021 |
5.7
|
A |
| 203 |
FPMC 34
IMO 9845166
|
49,781 | 2019 |
5.7
|
A |
| 204 |
SOLAR SALLY
IMO 9898498
|
49,314 | 2021 |
5.7
|
A |
| 205 |
STENA IMPRIMIS
IMO 9797395
|
49,718 | 2017 |
5.7
|
A |
| 208 |
ARDMORE SEAVANTAGE
IMO 9637076
|
47,790 | 2014 |
5.7
|
A |
| 206 |
NAVIG8 GRACE
IMO 9833656
|
49,804 | 2019 |
5.7
|
A |
| 207 |
BEAGLE
IMO 9814181
|
49,850 | 2019 |
5.7
|
A |
| 209 |
TORM DAPHNE
IMO 9692313
|
49,746 | 2015 |
5.7
|
A |
| 212 |
STENA IMMACULATE
IMO 9693018
|
49,729 | 2017 |
5.7
|
A |
| 211 |
SOLAR CHERYL
IMO 9898503
|
49,389 | 2021 |
5.7
|
A |
| 210 |
ELANDRA BALTIC
IMO 9482562
|
51,406 | 2011 |
5.7
|
A |
| 213 |
ALPINE EAGLE
IMO 9366275
|
51,542 | 2008 |
5.7
|
A |
| 214 |
BRITISH SAILOR
IMO 9724673
|
45,999 | 2016 |
5.7
|
A |
| 215 |
TORM DAGNY
IMO 9692337
|
49,635 | 2015 |
5.7
|
A |
| 217 |
SANTIAGO I
IMO 9730347
|
49,901 | 2022 |
5.7
|
A |
| 216 |
ARDMORE ENDURANCE
IMO 9654567
|
49,466 | 2013 |
5.7
|
A |
| 218 |
MIA GRACE
IMO 9681132
|
49,990 | 2014 |
5.8
|
A |
| 222 |
CLEAROCEAN MARVEL
IMO 9849291
|
49,995 | 2019 |
5.8
|
A |
| 221 |
CL EMILY BRONTE
IMO 9943322
|
49,348 | 2023 |
5.8
|
A |
| 220 |
MIDNIGHT GLORY
IMO 9877808
|
50,322 | 2019 |
5.8
|
A |
| 219 |
HIGH DISCOVERY
IMO 9674725
|
45,999 | 2014 |
5.8
|
A |
| 225 |
NORD OCEANIA
IMO 9747120
|
49,996 | 2018 |
5.8
|
A |
| 224 |
YASA ORION
IMO 9888340
|
50,215 | 2021 |
5.8
|
A |
| 226 |
CL AGATHA CHRISTIE
IMO 9943346
|
49,327 | 2023 |
5.8
|
A |
| 223 |
YASA FLAMINGO
IMO 9857236
|
50,215 | 2019 |
5.8
|
A |
| 228 |
THERESA LIMA
IMO 9946130
|
49,448 | 2023 |
5.8
|
A |
| 227 |
SALACGRIVA
IMO 9323390
|
52,620 | 2008 |
5.8
|
A |
| 229 |
HAFNIA KIRSTEN
IMO 9732682
|
49,999 | 2017 |
5.8
|
A |
| 230 |
CHEMROAD ORCHID
IMO 9790608
|
35,703 | 2019 |
5.8
|
A |
| 231 |
MARLIN AZURITE
IMO 9721920
|
49,999 | 2016 |
5.8
|
A |
| 233 |
MARLIN AMETRINE
IMO 9697234
|
49,999 | 2015 |
5.8
|
A |
| 232 |
MAGIC CHEMIST
IMO 9707261
|
49,990 | 2015 |
5.8
|
A |
| 235 |
ST GEORGE
IMO 9412775
|
50,651 | 2010 |
5.8
|
A |
| 234 |
COSMIC GLORY
IMO 9877822
|
50,322 | 2020 |
5.8
|
A |
| 236 |
SEA ELEPHANT
IMO 9853254
|
49,929 | 2019 |
5.8
|
A |
| 237 |
CLEAROCEAN MILANO
IMO 9917658
|
50,485 | 2021 |
5.8
|
A |
| 238 |
DORADO
IMO 9801574
|
50,067 | 2021 |
5.8
|
A |
| 240 |
QUARTZ
IMO 9681170
|
49,990 | 2015 |
5.8
|
A |
| 239 |
MARLIN AMMOLITE
IMO 9697246
|
49,999 | 2016 |
5.8
|
A |
| 241 |
HAKATA PRINCESS
IMO 9788564
|
49,842 | 2018 |
5.8
|
A |
| 242 |
FPMC 35
IMO 9845178
|
49,681 | 2020 |
5.9
|
A |
| 243 |
HAFNIA AQUAMARINE
IMO 9711573
|
38,506 | 2013 |
5.9
|
A |
| 245 |
PETITE SOEUR
IMO 9448712
|
50,420 | 2011 |
5.9
|
A |
| 244 |
NAVIG8 GAUNTLET
IMO 9853228
|
49,768 | 2019 |
5.9
|
A |
| 246 |
T JUNGFRAU
IMO 9389289
|
52,610 | 2009 |
5.9
|
A |
| 247 |
HIGH VOYAGER
IMO 9681845
|
45,999 | 2014 |
5.9
|
A |
| 250 |
SEA FRACTUS
IMO 9724609
|
45,999 | 2016 |
5.9
|
A |
| 249 |
ELANDRA MELODY
IMO 9676527
|
50,886 | 2014 |
5.9
|
A |
| 248 |
JOSE PROGRESS
IMO 9392391
|
47,018 | 2009 |
5.9
|
A |
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.