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 |
|---|---|---|---|---|---|
| 302 |
HAFNIA ARAGONITE
IMO 9727558
|
38,506 | 2015 |
6.3
|
B |
| 301 |
BOW TRIDENT
IMO 9669897
|
49,622 | 2014 |
6.3
|
B |
| 303 |
SEAWAYS MADELEINE
IMO 9380518
|
49,999 | 2008 |
6.3
|
B |
| 304 |
ARDMORE DAUNTLESS
IMO 9707388
|
37,764 | 2015 |
6.3
|
B |
| 305 |
FAIR WONDER
IMO 9327449
|
47,872 | 2006 |
6.3
|
B |
| 306 |
HAFNIA TANZANITE
IMO 9753703
|
49,478 | 2014 |
6.3
|
B |
| 307 |
ALIGOTE
IMO 9440497
|
74,192 | 2010 |
6.3
|
B |
| 308 |
MARITIME AMITY
IMO 9848340
|
49,995 | 2021 |
6.3
|
B |
| 309 |
STOLT DUGONG
IMO 9565699
|
33,590 | 2012 |
6.3
|
B |
| 311 |
UZAVA
IMO 9323388
|
52,650 | 2008 |
6.3
|
B |
| 310 |
HAFNIA AXINITE
IMO 9719771
|
38,506 | 2015 |
6.3
|
B |
| 312 |
SILVER GERTRUDE
IMO 9683348
|
49,746 | 2014 |
6.3
|
B |
| 313 |
CIELO DI SALERNO
IMO 9717292
|
39,309 | 2016 |
6.3
|
B |
| 315 |
BOW SKY
IMO 9215268
|
49,479 | 2005 |
6.3
|
B |
| 314 |
STOLT ENDURANCE
IMO 9284697
|
32,858 | 2004 |
6.3
|
B |
| 316 |
STENA IMAGINATION
IMO 9685463
|
49,689 | 2016 |
6.3
|
B |
| 317 |
WENCHE VICTORY
IMO 9288825
|
47,210 | 2005 |
6.3
|
B |
| 319 |
JOHNNY RANGER
IMO 9388209
|
50,922 | 2008 |
6.3
|
B |
| 318 |
GREAT EPSILON
IMO 9873644
|
49,298 | 2020 |
6.3
|
B |
| 321 |
PRAGUE
IMO 9421324
|
49,999 | 2008 |
6.3
|
B |
| 320 |
SC FALCON
IMO 9746190
|
33,984 | 2016 |
6.3
|
B |
| 322 |
OLYMPIOS
IMO 9919620
|
50,434 | 2020 |
6.4
|
B |
| 323 |
LV LIZZY
IMO 9303417
|
49,414 | 2005 |
6.4
|
B |
| 325 |
ELKA ASTIR
IMO 9705885
|
49,990 | 2015 |
6.4
|
B |
| 324 |
CL PEARL BUCK
IMO 9943334
|
49,315 | 2023 |
6.4
|
B |
| 326 |
VELA
IMO 9682461
|
49,126 | 2014 |
6.4
|
B |
| 328 |
CHAMPION ISTRA
IMO 9489209
|
51,655 | 2012 |
6.4
|
B |
| 327 |
ATLANTIC GUARD
IMO 9789269
|
49,951 | 2019 |
6.4
|
B |
| 330 |
NCC SAFA
IMO 9411329
|
45,471 | 2011 |
6.4
|
B |
| 329 |
MINERVA ZEN
IMO 9410909
|
52,914 | 2009 |
6.4
|
B |
| 331 |
FPMC 29
IMO 9581667
|
50,545 | 2011 |
6.4
|
B |
| 332 |
HAFNIA ANDROMEDA
IMO 9461661
|
49,999 | 2011 |
6.4
|
B |
| 333 |
GREAT THITA
IMO 9873670
|
49,276 | 2020 |
6.4
|
B |
| 334 |
NCC REEM
IMO 9459034
|
45,498 | 2012 |
6.4
|
B |
| 335 |
JIPRO ISIS
IMO 9370719
|
37,946 | 2008 |
6.4
|
B |
| 337 |
MINERVA JULIE
IMO 9380831
|
49,990 | 2008 |
6.4
|
B |
| 336 |
AUGENSTERN
IMO 9939577
|
49,600 | 2021 |
6.4
|
B |
| 338 |
OCEAN BREEZE
IMO 9391529
|
50,748 | 2008 |
6.4
|
B |
| 339 |
SC VIRGO
IMO 9801093
|
40,870 | 2018 |
6.4
|
B |
| 340 |
CHEMROAD JUPITER
IMO 9932713
|
35,722 | 2022 |
6.5
|
B |
| 341 |
BOW ODYSSEY
IMO 9818539
|
49,100 | 2020 |
6.5
|
B |
| 343 |
MERSIN
IMO 9428683
|
50,139 | 2009 |
6.5
|
B |
| 342 |
VALIANTA
IMO 9294666
|
46,792 | 2006 |
6.5
|
B |
| 345 |
PAPILLON
IMO 9345659
|
47,302 | 2007 |
6.5
|
B |
| 344 |
SEA LEGEND
IMO 9349198
|
47,786 | 2007 |
6.5
|
B |
| 348 |
SIRTAKI
IMO 9369887
|
51,442 | 2009 |
6.5
|
B |
| 347 |
CHEMROAD QUEEN
IMO 9737151
|
35,847 | 2015 |
6.5
|
B |
| 346 |
UOG CONSTANTINE G
IMO 9422512
|
49,999 | 2010 |
6.5
|
B |
| 350 |
BOW SUMMER
IMO 9215270
|
49,592 | 2005 |
6.5
|
B |
| 349 |
BOW TRIUMPH
IMO 9669902
|
49,622 | 2015 |
6.5
|
B |
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.