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.

Segment rank (2025)

#943 of 1,651 oil tankers

CO₂ intensity

4.3 g CO₂/dwt·nm

vs segment average (5.18)

-17% greener

Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo

Sort 🌱 Greenest first 🔧 Least efficient first — retrofit candidates

Size (DWT)

All sizes < 25,000 DWT 25k – 60k DWT 60k – 100k DWT 100k – 200k DWT > 200,000 DWT

Year

2025 2024

1,685

vessels ranked

1.32

greenest (g CO₂/t·nm)

4.01

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
901	DUBAI ATTRACTION IMO 9422536	115,459	2011	250 m	Hyundai - 6S60MC-C	4.2	C
902	NISSOS SERIFOS IMO 9592264	115,688	2012	249 m	Doosan - 6S60MC-C	4.2	C
903	JAARLI IMO 9892432	112,459	2021	249 m	MAN - 6G60ME-C9	4.2	C
904	PALLADIUM IMO 9773923	113,221	2017	250 m	Hyundai - 6S70ME-C9	4.2	C
905	EUROINTEGRITY IMO 9410648	105,291	2009	244 m	Hyundai - 6S90MC-C	4.2	C
906	KMARIN RENOWN IMO 9683013	109,693	2016	250 m	MAN - 6G60ME-C9	4.2	C
907	MAERSK CYPRUS IMO 9786217	49,919	2020	183 m	STX - 6G50ME-C9.5 - Tier II	4.2	C
908	ADVANTAGE START IMO 9466570	156,644	2011	274 m	MAN - 6S70MC-C	4.2	C
909	STI ELYSEES IMO 9688829	109,999	2014	256 m	HHI - 6G60ME-C9.2	4.2	C
910	AEGEAN NOBILITY IMO 9345441	115,814	2007	249 m	MAN - 6S60MC-C	4.2	C
911	MAERSK CANCUN IMO 9786138	49,919	2018	183 m	STX - 6G50ME-C9	4.2	C
912	AQUALEGACY IMO 9601833	115,763	2012	249 m	Doosan - DOOSAN-MAN 6S60MC-C	4.2	C
913	INDIGO SUN IMO 9592288	115,724	2012	249 m	Doosan - 6S60MC-C	4.2	C
914	TOVE KNUTSEN IMO 9868376	152,868	2020	279 m	MAN - 6G70ME-C10	4.2	C
915	STI GAUNTLET IMO 9717137	109,999	2017	250 m	CSSC - 6S60ME-C8	4.2	C
916	GLADIATOR IMO 9378864	149,944	2008	274 m	Wärtsilä - 6RTA72U	4.2	C
917	KMARIN RESPECT IMO 9683001	109,584	2016	250 m	MAN - 6G60ME-C9	4.3	C
918	CABO MISAKI IMO 9755062	74,177	2017	228 m	STX - 6G60ME-C9	4.3	C
919	FPMC P IDEAL IMO 9459709	109,994	2012	244 m	Mitsui - 6S60MC-C	4.3	C
920	ANIKITOS IMO 9953444	50,113	2023	183 m	6G50ME-C9-HPSCR	4.3	C
921	BAYOU SUN IMO 9911537	49,999	2022	186 m	6G50ME-C9-LGIM	4.3	C
922	PHOENIX ADMIRAL IMO 9482603	114,024	2007	250 m	HHI - 7S60MC-C7	4.3	C
923	KMARIN RESOURCE IMO 9683037	109,483	2016	250 m	MAN - 6G60ME-C9	4.3	C
924	JAG SPARROW IMO 9297412	74,999	2005	228 m	MAN - 6S60MC-C	4.3	C
925	ADVANTAGE SPRING IMO 9466582	156,596	2010	274 m	MAN - 6S70MC	4.3	C
926	MARCILIO DIAS IMO 9453858	157,055	2015	274 m	MAN - 6S70ME-C	4.3	C
927	PACIFIC NAFSIKA IMO 9732278	109,999	2015	250 m	Doosan - 6G60ME-C9	4.3	C
928	OLIB IMO 9334739	108,433	2009	246 m	BRODOSPLIT - 6S70MC-C	4.3	C
929	HOVDEN SPIRIT IMO 9596997	105,276	2010	244 m	HHI - 6S60MC-C8.1	4.3	C
930	STI SYMPHONY IMO 9719692	109,999	2016	249 m	MAN - 6G60ME-C9	4.3	C
931	NORDIC LIGHT IMO 9436446	158,475	2010	274 m	MAN - 6S70MC-C	4.3	C
932	TORM EVELYN IMO 9456927	74,213	2011	228 m	Hyundai - 6S60MC-C8	4.3	C
933	LUZON SPIRIT IMO 9572276	109,581	2011	243 m	Hudong Heavy Machinery - 7 S 60 MC	4.3	C
934	HAFNIA ANDREA IMO 9688415	50,040	2015	183 m	MAN - 6G50ME-B9	4.3	C
935	TP AFFINITY IMO 9645401	114,070	2016	252 m	Hyundai - 6X62	4.3	C
936	CAPE BILBAO IMO 1035052	50,607	2025	183 m	MAN-B&W 6S50ME-C9	4.3	C
937	SEA VALIANT IMO 9420629	107,488	2010	244 m	MAN - 6S60MC-C	4.3	C
938	YASA GOLDEN DARDANELLES IMO 9339985	110,828	2008	246 m	Mitsui - 7S60MC	4.3	C
939	FOSSIL IMO 9379624	115,760	2009	249 m	MAN - 6S60MC-C	4.3	C
940	BLUE PRINCE IMO 9429182	109,010	2009	243 m	MAN - 7S60MC	4.3	C
941	DELTA STAR IMO 9458016	115,618	2013	249 m	MAN - 6S60MC-C	4.3	C
942	STELLATA IMO 9732230	109,991	2016	238 m	Mitsui - 6S60ME-C8	4.3	C
943	CABO FROWARD IMO 9311359	74,543	2006	228 m	MAN - 7S50MC-C	4.3	C
944	KMARIN RESOLUTION IMO 9683051	109,484	2016	250 m	MAN - 6G60ME-C9	4.3	C
945	SAGA IMO 9528031	115,738	2011	249 m	Doosan - 7S60MC-C MK7	4.3	C
946	LADY HENRIETTA IMO 9604380	111,815	2012	250 m	Hyundai - 7S60MC-C	4.3	C
947	CALYPSO IMO 9899296	111,930	2021	237 m	MAN - 6G60ME-C9	4.3	C
948	NORTHERNLIGHT IMO 9577123	74,565	2012	228 m	MAN - 6S60MC-C	4.3	C
949	CLIO IMO 9396660	112,705	2008	250 m	HHI - 7S60MC-C7	4.3	C
950	CALIDA IMO 9522128	115,812	2008	249 m	Doosan - 7S60MC-C MK7	4.3	C

Page 19 of 34 — 1,651 vessels

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Engine intelligence

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.

Emission-friendly engine ranking

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.