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 |
|---|---|---|---|---|---|
| 801 |
IONIC ANASSA
IMO 9779795
|
114,718 | 2016 |
3.9
|
C |
| 802 |
SPETSA
IMO 9337004
|
150,265 | 2008 |
3.9
|
C |
| 803 |
ZOUZOU N.
IMO 9410222
|
149,991 | 2010 |
3.9
|
C |
| 804 |
CIELO DI ROTTERDAM
IMO 9781279
|
74,999 | 2018 |
3.9
|
C |
| 805 |
BELMAR
IMO 9516959
|
115,903 | 2011 |
3.9
|
C |
| 806 |
GREEN ADMIRE
IMO 9927196
|
114,377 | 2022 |
3.9
|
C |
| 807 |
ANGELA GLORY
IMO 9952957
|
49,903 | 2023 |
3.9
|
C |
| 808 |
GARRINCHA
IMO 9547702
|
115,727 | 2019 |
3.9
|
C |
| 809 |
DAYTONA
IMO 9528043
|
115,896 | 2011 |
3.9
|
C |
| 810 |
NORDSYMPHONY
IMO 9403475
|
106,246 | 2008 |
3.9
|
C |
| 811 |
KRITI KING
IMO 9887255
|
158,005 | 2021 |
3.9
|
C |
| 812 |
YINGHAO CONFIDENCE
IMO 9389978
|
107,600 | 2010 |
3.9
|
C |
| 813 |
SAMOTHRAKI
IMO 1033808
|
113,532 | 2025 |
3.9
|
C |
| 814 |
ADVANTAGE LIFE
IMO 9708564
|
109,999 | 2015 |
3.9
|
C |
| 815 |
ADVANTAGE LOVE
IMO 9708552
|
110,000 | 2015 |
3.9
|
C |
| 816 |
HAFNIA EXCELLENCE
IMO 9735646
|
74,613 | 2016 |
3.9
|
C |
| 817 |
STI SUPREME
IMO 9719721
|
109,999 | 2016 |
3.9
|
C |
| 818 |
TIGERLILY
IMO 9398280
|
107,525 | 2010 |
3.9
|
C |
| 819 |
ON PEACE
IMO 9893204
|
114,623 | 2021 |
4.0
|
C |
| 820 |
KRITI FUTURE
IMO 9924326
|
156,734 | 2022 |
4.0
|
C |
| 821 |
SILVER EUPLECTA
IMO 9692349
|
49,635 | 2015 |
4.0
|
C |
| 822 |
STI GRACE
IMO 9722584
|
109,999 | 2016 |
4.0
|
C |
| 823 |
CATALAN SEA
IMO 9577044
|
116,620 | 2012 |
4.0
|
C |
| 824 |
ODESSA
IMO 9633458
|
162,090 | 2011 |
4.0
|
C |
| 825 |
EURO
IMO 9567702
|
157,539 | 2012 |
4.0
|
C |
| 826 |
STI SOLACE
IMO 9708588
|
109,999 | 2013 |
4.0
|
C |
| 827 |
SINBAD
IMO 9413688
|
115,928 | 2009 |
4.0
|
C |
| 828 |
SEARUBY
IMO 9759795
|
114,073 | 2017 |
4.0
|
C |
| 829 |
STI STEADFAST
IMO 9719719
|
109,999 | 2016 |
4.0
|
C |
| 830 |
IASONAS
IMO 9419357
|
115,500 | 2006 |
4.0
|
C |
| 831 |
PROTEUS HARVONNE
IMO 9923401
|
109,999 | 2022 |
4.0
|
C |
| 832 |
LEVANTINE SEA
IMO 9815616
|
114,218 | 2018 |
4.0
|
C |
| 833 |
FREEPORT STAR
IMO 9933212
|
115,518 | 2023 |
4.0
|
C |
| 834 |
FRONT SIRIUS
IMO 9767340
|
110,000 | 2014 |
4.0
|
C |
| 835 |
LUCKY TRADER
IMO 9952608
|
49,813 | 2021 |
4.0
|
C |
| 836 |
GIANNIS
IMO 9432050
|
149,999 | 2011 |
4.0
|
C |
| 837 |
LIWA-V
IMO 9489039
|
105,221 | 2011 |
4.0
|
C |
| 838 |
SEA TIGER I
IMO 9358955
|
49,999 | 2007 |
4.0
|
C |
| 839 |
PERSEUS STAR
IMO 9891684
|
116,026 | 2021 |
4.0
|
C |
| 840 |
WISDOM VENTURE
IMO 9773741
|
112,186 | 2017 |
4.0
|
C |
| 841 |
MINERVA SYMPHONY
IMO 9304605
|
159,450 | 2006 |
4.0
|
C |
| 842 |
MARAN THULE
IMO 9895264
|
147,098 | 2022 |
4.0
|
C |
| 843 |
HAI SHANG
IMO 9792852
|
109,900 | 2018 |
4.0
|
C |
| 844 |
MINERVA MARINA
IMO 9411939
|
157,954 | 2009 |
4.0
|
C |
| 845 |
T.KURUCESME
IMO 9692478
|
105,171 | 2013 |
4.0
|
C |
| 846 |
STI SOLIDARITY
IMO 9708576
|
109,999 | 2015 |
4.0
|
C |
| 847 |
BNEIDER
IMO 9595010
|
110,587 | 2012 |
4.0
|
C |
| 848 |
AFRAPEARL II
IMO 9437672
|
115,897 | 2010 |
4.0
|
C |
| 849 |
ORANGE STARS
IMO 9433597
|
115,756 | 2011 |
4.0
|
C |
| 850 |
TILOS I
IMO 9800271
|
149,999 | 2018 |
4.0
|
C |
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.