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 |
|---|---|---|---|---|---|
| 1751 |
SALINA M
IMO 9340910
|
11,283 | 2007 |
16.2
|
E |
| 1752 |
ASTRAL
IMO 9371878
|
11,317 | 2006 |
16.2
|
E |
| 1753 |
ASTINA
IMO 9320063
|
11,283 | 2006 |
16.3
|
E |
| 1754 |
CALAJUNCO M
IMO 9359571
|
21,600 | 2007 |
16.3
|
E |
| 1755 |
WHITE STAR
IMO 9799109
|
7,904 | 2017 |
16.3
|
E |
| 1756 |
CHALLAH
IMO 9933913
|
9,137 | 2022 |
16.5
|
E |
| 1757 |
EASTERN SPIRAEA
IMO 9909754
|
11,531 | 2022 |
17.0
|
E |
| 1758 |
NAV DURGA
IMO 9260005
|
37,198 | 2003 |
17.0
|
E |
| 1759 |
FURE SPEAR
IMO 9409273
|
16,585 | 2009 |
17.0
|
E |
| 1760 |
SONGA PEARL
IMO 9444455
|
17,539 | 2008 |
17.0
|
E |
| 1761 |
GANGES STAR
IMO 9496692
|
13,013 | 2010 |
17.3
|
E |
| 1762 |
SIRI KNUTSEN
IMO 9247168
|
37,494 | 2004 |
17.4
|
E |
| 1763 |
KIISLA
IMO 9267558
|
14,750 | 2004 |
17.5
|
E |
| 1764 |
EVIE PG
IMO 9396359
|
9,990 | 2007 |
17.6
|
E |
| 1765 |
EBERHART ESSBERGER
IMO 9939802
|
7,129 | 2024 |
17.8
|
E |
| 1766 |
HEINRICH ESSBERGER
IMO 9939814
|
7,109 | 2024 |
17.9
|
E |
| 1767 |
COLORADO STAR
IMO 9527609
|
13,021 | 2010 |
17.9
|
E |
| 1768 |
NORSIGN WAVE
IMO 9312080
|
16,772 | 2006 |
18.1
|
E |
| 1769 |
BASILUZZO M.
IMO 9323857
|
12,000 | 2006 |
18.1
|
E |
| 1770 |
NATIG ALIYEV
IMO 9194000
|
19,800 | 2002 |
18.1
|
E |
| 1771 |
PANAREA M
IMO 9329148
|
11,420 | 2006 |
18.2
|
E |
| 1772 |
BAUSTELLA
IMO 9812133
|
7,995 | 2018 |
18.4
|
E |
| 1773 |
STELLA POLARIS
IMO 9187057
|
8,297 | 1999 |
18.5
|
E |
| 1774 |
BRO ANNA
IMO 9344435
|
16,867 | 2008 |
18.7
|
E |
| 1775 |
LILSTELLA
IMO 9794771
|
7,944 | 2016 |
18.9
|
E |
| 1776 |
MELIGUNIS M
IMO 9451214
|
11,258 | 2008 |
18.9
|
E |
| 1777 |
SINAR MINAHASA
IMO 9433860
|
12,693 | 2007 |
19.0
|
E |
| 1778 |
JOHN T. ESSBERGER
IMO 9939797
|
7,100 | 2023 |
19.0
|
E |
| 1779 |
XT PEACE
IMO 9980265
|
7,493 | 2023 |
19.0
|
E |
| 1780 |
SONGA SAPPHIRE
IMO 9444467
|
17,596 | 2008 |
19.2
|
E |
| 1781 |
FELIX
IMO 9464182
|
8,963 | 2009 |
19.2
|
E |
| 1782 |
SANDVIKEN
IMO 9803649
|
12,659 | 2018 |
19.4
|
E |
| 1783 |
SKUTEVIKEN
IMO 9803651
|
12,658 | 2018 |
19.6
|
E |
| 1784 |
LISELOTTE ESSBERGER
IMO 9939785
|
7,134 | 2023 |
19.9
|
E |
| 1785 |
IVER BEAUTY
IMO 9588263
|
6,175 | 2011 |
20.2
|
E |
| 1786 |
GOLDEN DAHLIA
IMO 9858785
|
34,834 | 2021 |
20.3
|
E |
| 1787 |
IVER BLESSING
IMO 9588287
|
6,189 | 2011 |
20.4
|
E |
| 1788 |
BLACK SHARK
IMO 9480655
|
8,476 | 2010 |
21.1
|
E |
| 1789 |
SONGA OPAL
IMO 9473913
|
17,588 | 2009 |
21.3
|
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.