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 |
|---|---|---|---|---|---|
| 1551 |
HISTRIA GEMMA
IMO 9436719
|
40,404 | 2010 |
8.0
|
E |
| 1552 |
PINE MEADOW
IMO 9478688
|
50,171 | 2010 |
8.1
|
E |
| 1553 |
HELLESPONT PRIDE
IMO 9351414
|
73,727 | 2006 |
8.1
|
E |
| 1554 |
CHANTAL
IMO 9382982
|
74,329 | 2009 |
8.1
|
E |
| 1555 |
VS LISBETH
IMO 9309978
|
38,492 | 2006 |
8.1
|
E |
| 1556 |
FURE VANGUARD
IMO 9963360
|
17,942 | 2024 |
8.1
|
E |
| 1557 |
OM BORNEO
IMO 9341445
|
29,013 | 2007 |
8.1
|
E |
| 1558 |
SAN SEBASTIAN
IMO 9314856
|
37,258 | 2007 |
8.2
|
E |
| 1559 |
VS LEIA
IMO 9303730
|
38,461 | 2006 |
8.2
|
E |
| 1560 |
GLENDA MELODY
IMO 9455818
|
47,238 | 2011 |
8.2
|
E |
| 1561 |
SEAPIKE
IMO 9423449
|
43,550 | 2009 |
8.3
|
E |
| 1562 |
SOUTHERN SHARK
IMO 9821299
|
26,051 | 2018 |
8.3
|
E |
| 1563 |
MOUNT MCKINNEY
IMO 9263174
|
40,007 | 2004 |
8.3
|
E |
| 1564 |
TATIANA
IMO 9340128
|
38,396 | 2007 |
8.3
|
E |
| 1565 |
SINDRE KNUTSEN
IMO 9905928
|
123,602 | 2022 |
8.3
|
E |
| 1566 |
SUNNY STAR
IMO 9470959
|
37,857 | 2010 |
8.3
|
E |
| 1567 |
STI HAMMERSMITH
IMO 9706463
|
38,734 | 2015 |
8.3
|
E |
| 1568 |
ALLEGRA
IMO 9436707
|
40,408 | 2006 |
8.3
|
E |
| 1569 |
MOUNT OLYMPUS
IMO 9260081
|
40,011 | 2003 |
8.3
|
E |
| 1570 |
TORM AGNES
IMO 9465992
|
49,999 | 2011 |
8.3
|
E |
| 1571 |
MINERVA GRACE
IMO 9305855
|
50,922 | 2005 |
8.4
|
E |
| 1572 |
TORILL KNUTSEN
IMO 9630030
|
123,166 | 2013 |
8.4
|
E |
| 1573 |
SILVER HEBA
IMO 9718870
|
49,897 | 2013 |
8.4
|
E |
| 1574 |
MINERVA ANTONIA
IMO 9380398
|
46,923 | 2008 |
8.5
|
E |
| 1575 |
THUN VETTERN
IMO 9971214
|
17,945 | 2024 |
8.5
|
E |
| 1576 |
ALKEA
IMO 9425502
|
36,207 | 2009 |
8.5
|
E |
| 1577 |
STI POPLAR
IMO 9696589
|
38,734 | 2014 |
8.5
|
E |
| 1578 |
FURE VISKAER
IMO 9980320
|
17,953 | 2024 |
8.5
|
E |
| 1579 |
HISTRIA IVORY
IMO 9356244
|
40,450 | 2006 |
8.6
|
E |
| 1580 |
FURE VITEN
IMO 9898204
|
17,999 | 2021 |
8.6
|
E |
| 1581 |
MAERSK KAYA
IMO 9431288
|
39,738 | 2011 |
8.6
|
E |
| 1582 |
M BRISTOL
IMO 9299434
|
29,050 | 2005 |
8.6
|
E |
| 1583 |
MAERSK BEAUFORT
IMO 9340594
|
29,015 | 2006 |
8.6
|
E |
| 1584 |
HILDA KNUTSEN
IMO 9628300
|
123,166 | 2013 |
8.7
|
E |
| 1585 |
STI FINCHLEY
IMO 9696565
|
38,734 | 2014 |
8.7
|
E |
| 1586 |
MINERVA ANNA
IMO 9298507
|
50,922 | 2005 |
8.7
|
E |
| 1587 |
HENRY MAERSK
IMO 9399351
|
37,933 | 2010 |
8.7
|
E |
| 1588 |
STAR RIVER
IMO 9815458
|
36,819 | 2018 |
8.7
|
E |
| 1589 |
STI CLAPHAM
IMO 9696577
|
38,734 | 2014 |
8.7
|
E |
| 1590 |
FURE VIKEN
IMO 9980318
|
17,945 | 2024 |
8.7
|
E |
| 1591 |
NV ATHENA
IMO 9527075
|
21,166 | 2011 |
8.8
|
E |
| 1592 |
HULDA MAERSK
IMO 9399363
|
37,959 | 2010 |
8.8
|
E |
| 1593 |
OM SINGAPORE
IMO 9341433
|
29,015 | 2007 |
8.8
|
E |
| 1594 |
SKY
IMO 9380350
|
37,879 | 2007 |
8.8
|
E |
| 1595 |
SEAEXPRESS
IMO 9344019
|
45,976 | 2007 |
8.8
|
E |
| 1596 |
MAERSK KARA
IMO 9374428
|
38,396 | 2008 |
8.9
|
E |
| 1597 |
MUMBAI
IMO 9242338
|
46,818 | 2000 |
8.9
|
E |
| 1598 |
KRITI
IMO 9270737
|
47,999 | 2004 |
8.9
|
E |
| 1599 |
LISCA NERA M
IMO 9436692
|
42,000 | 2009 |
8.9
|
E |
| 1600 |
ZAPPHIRE
IMO 9391957
|
47,329 | 2010 |
9.0
|
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 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.