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 2025. 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 |
|---|---|---|---|---|---|
| 1301 |
EVROTAS
IMO 9309241
|
61,281 | 2006 |
6.3
|
D |
| 1302 |
NORD VALKYRIE
IMO 9893773
|
49,999 | 2019 |
6.3
|
D |
| 1303 |
MARAN NANSEN
IMO 9438860
|
109,239 | 2010 |
6.3
|
D |
| 1304 |
LADY CHRISTINA
IMO 9372858
|
73,626 | 2007 |
6.3
|
D |
| 1305 |
ADVANTAGE PIONEER
IMO 9577070
|
74,552 | 2011 |
6.4
|
D |
| 1306 |
HAFNIA EXPERIENCE
IMO 9735610
|
74,669 | 2016 |
6.4
|
D |
| 1307 |
BREEZE III
IMO 9292515
|
115,525 | 2005 |
6.4
|
D |
| 1308 |
MARLIN AVENTURINE
IMO 9721918
|
49,999 | 2016 |
6.4
|
D |
| 1309 |
HAMBURG STAR
IMO 9298325
|
73,815 | 2005 |
6.4
|
D |
| 1310 |
HAFNIA ASIA
IMO 9467809
|
74,490 | 2010 |
6.4
|
D |
| 1311 |
JANINE K
IMO 9544607
|
48,045 | 2009 |
6.4
|
D |
| 1312 |
HELENE MAERSK
IMO 9389514
|
38,016 | 2010 |
6.4
|
D |
| 1313 |
OVERSEAS SANTORINI
IMO 9435909
|
51,662 | 2010 |
6.4
|
D |
| 1314 |
NORD VICTORIOUS
IMO 9903138
|
49,995 | 2021 |
6.5
|
D |
| 1315 |
INGRID KNUTSEN
IMO 9649225
|
111,634 | 2013 |
6.5
|
D |
| 1316 |
MARAN AMUNDSEN
IMO 9438858
|
109,289 | 2010 |
6.5
|
D |
| 1317 |
STI CAMDEN
IMO 9688386
|
38,734 | 2014 |
6.5
|
D |
| 1318 |
ROSSA
IMO 9391505
|
50,633 | 2008 |
6.5
|
D |
| 1319 |
CANAL STREET
IMO 9539561
|
49,993 | 2012 |
6.5
|
D |
| 1320 |
CAPTAIN A. STELLATOS
IMO 9439670
|
105,848 | 2006 |
6.5
|
D |
| 1321 |
MKD VYOM
IMO 9284386
|
74,032 | 2007 |
6.5
|
D |
| 1322 |
KIZOMBA
IMO 9433901
|
51,747 | 2009 |
6.5
|
E |
| 1323 |
REGUETON
IMO 9411989
|
37,872 | 2009 |
6.5
|
E |
| 1324 |
WECO SENNA
IMO 1041465
|
49,500 | — |
6.5
|
E |
| 1325 |
ARENDAL
IMO 9516222
|
49,999 | 2010 |
6.6
|
E |
| 1326 |
MINERVA JOY
IMO 9363479
|
45,990 | 2008 |
6.6
|
E |
| 1327 |
VALLE BIANCA
IMO 9387580
|
50,633 | 2007 |
6.6
|
E |
| 1328 |
PS SYDNEY
IMO 9829459
|
49,999 | 2019 |
6.7
|
E |
| 1329 |
STRENGTH
IMO 9418145
|
50,497 | 2009 |
6.7
|
E |
| 1330 |
NAVE AQUILA
IMO 9459072
|
49,952 | 2012 |
6.7
|
E |
| 1331 |
MINERVA PACIFICA
IMO 9325831
|
45,822 | 2006 |
6.7
|
E |
| 1332 |
HISTRIA IVORY
IMO 9356244
|
40,450 | 2006 |
6.8
|
E |
| 1333 |
TORM FREEDOM
IMO 9797395
|
49,718 | 2017 |
6.8
|
E |
| 1334 |
MP MR TANKER 3
IMO 9573684
|
47,962 | 2010 |
6.8
|
E |
| 1335 |
ALPINE LIGHT
IMO 9478717
|
50,238 | 2006 |
6.8
|
E |
| 1336 |
MINERVA RITA
IMO 9305867
|
50,950 | 2005 |
6.8
|
E |
| 1337 |
STI CLAPHAM
IMO 9696577
|
38,734 | 2014 |
6.8
|
E |
| 1338 |
IXORA
IMO 9940459
|
111,006 | 2022 |
6.8
|
E |
| 1339 |
ATLANTIC FALCON
IMO 9789257
|
49,951 | 2018 |
6.8
|
E |
| 1340 |
FPMC 26
IMO 9433846
|
49,998 | 2011 |
6.9
|
E |
| 1341 |
MINERVA MEDITERRANEA
IMO 9367671
|
47,522 | 2008 |
6.9
|
E |
| 1342 |
FAIR WONDER
IMO 9327449
|
47,872 | 2006 |
6.9
|
E |
| 1343 |
HISTRIA PRINCE
IMO 9436666
|
40,410 | 2008 |
6.9
|
E |
| 1344 |
SUCCESS
IMO 9418133
|
50,571 | 2009 |
6.9
|
E |
| 1345 |
BLOSSOM GLORY
IMO 9362372
|
50,605 | 2007 |
6.9
|
E |
| 1346 |
EAGLE BERGEN
IMO 9676137
|
120,567 | 2015 |
6.9
|
E |
| 1347 |
HISTRIA AZURE
IMO 9357561
|
40,394 | 2007 |
6.9
|
E |
| 1348 |
TIGER EYE
IMO 9746255
|
49,990 | 2016 |
6.9
|
E |
| 1349 |
OKEE ULF
IMO 9311048
|
53,688 | 2006 |
7.0
|
E |
| 1350 |
ASPHALT SPLENDOR
IMO 9763332
|
36,962 | 2015 |
7.0
|
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 2025 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.