Most Emission-Efficient Oil 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 |
|---|---|---|---|---|---|
| 449 |
AIGEORGIS
IMO 9891660
|
116,092 | 2021 |
3.1
|
B |
| 454 |
FRONT CAPELLA
IMO 9790995
|
111,000 | 2017 |
3.1
|
B |
| 453 |
RS TARA
IMO 9765354
|
160,036 | 2016 |
3.1
|
B |
| 455 |
PHILOTIMOS
IMO 9793997
|
113,247 | 2018 |
3.1
|
B |
| 452 |
DALI
IMO 9787936
|
115,281 | 2018 |
3.1
|
B |
| 457 |
C. INNOVATOR
IMO 9595618
|
313,999 | 2012 |
3.1
|
B |
| 456 |
STRYMON
IMO 9938030
|
115,429 | 2022 |
3.1
|
B |
| 458 |
SOLA TS
IMO 9724350
|
112,939 | 2017 |
3.1
|
B |
| 459 |
NJORD DF
IMO 9953468
|
114,545 | 2023 |
3.1
|
B |
| 461 |
PERTAMINA HALMAHERA
IMO 9872688
|
156,586 | 2020 |
3.1
|
B |
| 460 |
CRYSTAL
IMO 9956020
|
113,385 | 2021 |
3.1
|
B |
| 463 |
PROTEUS IWONA
IMO 9914670
|
109,999 | 2022 |
3.1
|
B |
| 462 |
HAFNIA NESO
IMO 9800312
|
109,990 | 2019 |
3.1
|
B |
| 465 |
VST AMARA
IMO 9742211
|
109,990 | 2017 |
3.1
|
B |
| 464 |
ITHAKI
IMO 9526461
|
299,940 | 2011 |
3.1
|
B |
| 466 |
HAFNIA LILLESAND
IMO 9946477
|
109,999 | 2024 |
3.1
|
B |
| 472 |
PACIFIC GARNET
IMO 9893084
|
113,306 | 2021 |
3.1
|
B |
| 468 |
CAPTAIN SPIRO
IMO 9692856
|
113,796 | 2014 |
3.1
|
B |
| 467 |
TORM HOUSTON
IMO 9904883
|
115,414 | 2022 |
3.1
|
B |
| 471 |
NAUTILUS I
IMO 9298765
|
163,927 | 2006 |
3.1
|
B |
| 470 |
MARLIN LOME
IMO 9823572
|
114,841 | 2022 |
3.1
|
B |
| 469 |
SIENNA
IMO 9336971
|
149,847 | 2007 |
3.1
|
B |
| 474 |
METRO AEGEAN
IMO 9973640
|
114,934 | 2024 |
3.1
|
B |
| 473 |
ALMI GALAXY
IMO 9579509
|
157,787 | 2012 |
3.1
|
B |
| 475 |
FREEPORT STAR
IMO 9933212
|
115,518 | 2023 |
3.1
|
B |
| 476 |
MARAN HELEN
IMO 9779381
|
156,458 | 2017 |
3.1
|
B |
| 477 |
NISSOS IOS
IMO 9886770
|
157,447 | 2021 |
3.1
|
B |
| 479 |
PACIFIC EMERALD
IMO 9893022
|
113,306 | 2021 |
3.1
|
B |
| 478 |
SESTREA
IMO 9406659
|
158,519 | 2009 |
3.1
|
B |
| 480 |
SOUTH LOYALTY
IMO 9537769
|
314,000 | 2012 |
3.1
|
B |
| 482 |
SEA DRAGON
IMO 9903918
|
114,217 | 2019 |
3.2
|
B |
| 481 |
GREEN ANAX
IMO 9927213
|
114,405 | 2023 |
3.2
|
B |
| 484 |
PERSEUS STAR
IMO 9891684
|
116,026 | 2021 |
3.2
|
B |
| 483 |
HAFNIA LOIRE
IMO 9941697
|
109,999 | 2023 |
3.2
|
B |
| 488 |
SEA STAR
IMO 9945289
|
109,999 | 2023 |
3.2
|
B |
| 487 |
ARISTEA
IMO 9791315
|
112,794 | 2018 |
3.2
|
B |
| 489 |
SEA URCHIN
IMO 9886720
|
114,072 | 2019 |
3.2
|
B |
| 486 |
FREEDOM GLORY
IMO 9863417
|
114,122 | 2020 |
3.2
|
B |
| 490 |
STI LOTUS
IMO 9838230
|
109,995 | 2017 |
3.2
|
B |
| 485 |
LOS ANGELES SPIRIT
IMO 9318072
|
159,233 | 2007 |
3.2
|
B |
| 496 |
PINNACLE SPIRIT
IMO 9385192
|
159,995 | 2008 |
3.2
|
B |
| 498 |
NORDIC CROSS
IMO 9438418
|
158,475 | 2010 |
3.2
|
B |
| 497 |
SEAVOYAGER
IMO 9318096
|
159,233 | 2007 |
3.2
|
B |
| 494 |
ALMI SKY
IMO 9579523
|
157,787 | 2012 |
3.2
|
B |
| 493 |
FRONT FEATURE
IMO 9903970
|
109,894 | 2021 |
3.2
|
B |
| 495 |
CARIBBEAN VOYAGER
IMO 9857860
|
115,165 | 2020 |
3.2
|
B |
| 492 |
COBALT SUN
IMO 9814428
|
114,395 | 2015 |
3.2
|
B |
| 491 |
STATIA
IMO 9302982
|
150,205 | 2006 |
3.2
|
B |
| 500 |
STRESA
IMO 9912866
|
115,335 | 2022 |
3.2
|
B |
| 499 |
NOLDE
IMO 9787924
|
115,024 | 2018 |
3.2
|
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.