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 |
|---|---|---|---|---|---|
| 1401 |
NAVE RIGEL
IMO 9638551
|
64,999 | 2013 |
6.1
|
D |
| 1402 |
SILVER EBURNA
IMO 9718416
|
49,737 | 2016 |
6.1
|
D |
| 1403 |
TORM ALLEGRO
IMO 9484912
|
46,184 | 2012 |
6.1
|
D |
| 1404 |
MARLIN AVENTURINE
IMO 9721918
|
49,999 | 2016 |
6.1
|
D |
| 1405 |
HEATHER KNUTSEN
IMO 9273064
|
148,644 | 2005 |
6.1
|
D |
| 1406 |
STI WESTMINSTER
IMO 9706437
|
49,687 | 2013 |
6.1
|
D |
| 1407 |
BUBYAN
IMO 9656034
|
46,320 | 2014 |
6.1
|
D |
| 1408 |
VALROSSA
IMO 9391505
|
50,633 | 2008 |
6.1
|
D |
| 1409 |
TORM LAURA
IMO 9375616
|
53,160 | 2008 |
6.1
|
D |
| 1410 |
SCOTT SPIRIT
IMO 9466142
|
109,334 | 2011 |
6.2
|
D |
| 1411 |
MINERVA VIRGO
IMO 9307827
|
49,990 | 2006 |
6.2
|
D |
| 1412 |
DYLAN
IMO 9282510
|
46,874 | 2004 |
6.2
|
D |
| 1413 |
MARLIN AMBER
IMO 9697210
|
49,999 | 2015 |
6.2
|
D |
| 1414 |
TALARA
IMO 9569994
|
73,371 | 2010 |
6.2
|
D |
| 1415 |
OVERSEAS SANTORINI
IMO 9435909
|
51,662 | 2010 |
6.2
|
D |
| 1416 |
TURMOIL
IMO 9479838
|
50,358 | 2011 |
6.2
|
D |
| 1417 |
IOANNIS ZAFIRAKIS
IMO 9890587
|
49,999 | 2021 |
6.2
|
D |
| 1418 |
TORM VOYAGER
IMO 9326926
|
46,017 | 2008 |
6.2
|
D |
| 1419 |
VALERY ROMA
IMO 9360336
|
49,999 | 2007 |
6.2
|
D |
| 1420 |
TORM AMORINA
IMO 9484895
|
46,184 | 2012 |
6.2
|
D |
| 1421 |
ATAHUALPA
IMO 9451460
|
46,549 | 2010 |
6.3
|
D |
| 1422 |
HISTRIA DIONE
IMO 9800805
|
40,000 | 2020 |
6.3
|
D |
| 1423 |
VESTA
IMO 9629938
|
49,990 | 2012 |
6.3
|
D |
| 1424 |
JAG PUNIT
IMO 9709984
|
49,717 | 2016 |
6.3
|
D |
| 1425 |
MINERVA MEDITERRANEA
IMO 9367671
|
47,522 | 2008 |
6.3
|
D |
| 1426 |
KLEON
IMO 9730945
|
109,999 | 2016 |
6.3
|
D |
| 1427 |
APANEMO
IMO 9448164
|
74,788 | 2009 |
6.3
|
D |
| 1428 |
NH ERLE
IMO 9447744
|
51,551 | 2010 |
6.3
|
D |
| 1429 |
BURGAN
IMO 9656022
|
46,330 | 2014 |
6.3
|
D |
| 1430 |
AEGEA
IMO 9326500
|
51,371 | 2003 |
6.3
|
D |
| 1431 |
DAS
IMO 9439802
|
50,261 | 2009 |
6.3
|
D |
| 1432 |
MTM MISSISSIPPI
IMO 9315056
|
51,182 | 2006 |
6.3
|
D |
| 1433 |
TORM ASTRID
IMO 9510682
|
49,999 | 2012 |
6.3
|
E |
| 1434 |
TORM ANABEL
IMO 9543550
|
49,948 | 2012 |
6.4
|
E |
| 1435 |
KOUROS
IMO 9374507
|
49,999 | 2008 |
6.4
|
E |
| 1436 |
LUGGATI
IMO 9281009
|
115,048 | 2004 |
6.4
|
E |
| 1437 |
BW JAGUAR
IMO 9635858
|
49,999 | 2014 |
6.4
|
E |
| 1438 |
NAVE JUPITER
IMO 9657038
|
50,240 | 2011 |
6.4
|
E |
| 1439 |
CHIOS LION
IMO 9398280
|
107,525 | 2010 |
6.4
|
E |
| 1440 |
STAR EAGLE
IMO 9321938
|
51,202 | 2007 |
6.4
|
E |
| 1441 |
HTM DEFENDER
IMO 9346445
|
63,495 | 2008 |
6.4
|
E |
| 1442 |
TORM CORRIDO
IMO 9411305
|
46,156 | 2011 |
6.4
|
E |
| 1443 |
AL YAMAMAH
IMO 9856696
|
48,535 | 2020 |
6.4
|
E |
| 1444 |
PIS POLARIS
IMO 9426295
|
45,988 | 2010 |
6.4
|
E |
| 1445 |
FRIDA KNUTSEN
IMO 9905916
|
123,602 | 2022 |
6.4
|
E |
| 1446 |
TORM AMALIE
IMO 9466025
|
49,999 | 2011 |
6.5
|
E |
| 1447 |
MUTRIBA
IMO 9656058
|
46,327 | 2014 |
6.5
|
E |
| 1448 |
SEAWAYS STAMFORD
IMO 9697648
|
49,990 | 2015 |
6.5
|
E |
| 1449 |
ALPINE LIGHT
IMO 9478717
|
50,238 | 2006 |
6.5
|
E |
| 1450 |
VENDOME STREET
IMO 9573672
|
47,879 | 2011 |
6.5
|
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.