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)

#757 of 1,651 oil tankers

CO₂ intensity

3.8 g CO₂/dwt·nm

vs segment average (5.18)

-27% 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
749	HAIGUI IMO 9505821	114,900	2013	249 m	Doosan - 6S60MC-C	3.8	C
751	IONIC ALTHEA IMO 9728435	114,737	2016	250 m	MAN - 6G60ME-C9.2 - TierII	3.8	C
755	STI CONNAUGHT IMO 9697600	109,999	2013	256 m	MAN - 6G60ME-C9	3.8	C
754	VST AMARA IMO 9742211	109,990	2017	250 m	DALIAN MARINE - 6G60ME-C9	3.8	C
753	NAVIG8 PROMISE IMO 9791298	109,992	2015	250 m	CSSC - 6G60ME-C9	3.8	C
756	SERTANEJO SPIRIT IMO 9637715	154,233	2013	282 m	Doosan - 6S70ME-C 8.2	3.8	C
758	STI OXFORD IMO 9697595	109,999	2015	256 m	MAN - 6G60ME-C9	3.8	C
757	PACIFIC RAWAN IMO 9772022	109,999	2017	250 m	Doosan - 6G60ME-C9	3.8	C
759	ARCHANGEL IMO 9302592	163,216	2006	274 m	Hyundai - 6S70MC-C	3.8	C
765	STI LAVENDER IMO 9838254	109,999	2019	250 m	CSSC - 6G60ME-C9	3.8	C
764	KMARIN RELIANCE IMO 9683025	109,466	2016	250 m	MAN - 6G60ME-C9	3.8	C
763	ALFA ALANDIA IMO 9752797	106,324	2016	229 m	MAN - 6S60MC-C	3.8	C
762	SEA SAPPHIRE IMO 9935600	156,669	2022	274 m	6G70ME-C10-HPSCR	3.8	C
761	KWK EXCELSUS IMO 9728411	114,716	2016	250 m	MAN - 6G60ME-C9	3.8	C
760	ELANDRA BAY IMO 9821691	115,674	2018	250 m	Doosan - 6G60ME-C9	3.8	C
768	ALFA BALTICA IMO 9696773	106,373	2015	229 m	Mitsui - 6S60MC-C8	3.8	C
766	NISSOS CHRISTIANA IMO 9694658	114,264	2015	252 m	Hyundai - 6X62	3.8	C
767	SAMOS IMO 9772345	158,000	2018	274 m	CSSC - 6G70ME-C9	3.8	C
770	AMADES IMO 9903126	112,708	2022	250 m	MAN - 6G60ME-C9.5	3.8	C
769	SELIGER IMO 9402263	115,126	2009	244 m	Mitsui - 6S60MC-C	3.8	C
771	SWORD IMO 9783631	104,027	2018	229 m	Mitsui - 6S60ME-C9.2	3.8	C
772	VELOS AMBER IMO 9571038	74,902	2010	228 m	Mitsui - 6S60MC	3.8	C
773	MINERVA DOXA IMO 9304617	159,438	2007	277 m	Mitsui - MITSUI MAN B&W 6S70MC-C	3.8	C
775	ATLANTIC JADE IMO 9892987	109,325	2019	250 m	Hyundai Heavy Industries Co. Ltd. 6G60ME-C9.5	3.8	C
774	JAG LAXMI IMO 9568196	105,525	2012	244 m	HHI - 6S60MC-C8	3.8	C
777	STI SPIGA IMO 9708148	109,999	2015	256 m	MAN - 6G60ME-C9	3.8	C
776	PIS KERINCI IMO 9838242	109,994	2019	250 m	CSSC - 6G60ME-C9	3.8	C
778	CIELO DI HOUSTON IMO 9791860	74,999	2019	228 m	MAN - 6G70ME-C9	3.9	C
779	AFRODITI IMO 9452880	166,164	2011	274 m	MAN - 6S70MC-C	3.9	C
781	MARETA IMO 9537927	115,795	2013	249 m	Doosan - 7S60MC-C	3.9	C
780	STI ORCHARD IMO 9690834	109,999	2014	256 m	Doosan - 6G60ME-C	3.9	C
782	STI RAMBLA IMO 9730880	109,999	2017	250 m	Doosan - 6S60ME-C9	3.9	C
783	STI CONDOTTI IMO 9690810	109,999	2013	256 m	HHI - 6G60ME-C9.2	3.9	C
784	AL DASMA IMO 9653446	109,719	2014	250 m	Hyundai - 6RT-flex58T-E	3.9	C
787	ZUMBI DOS PALMARES IMO 9453810	157,055	2007	274 m	Doosan - 6S70ME-C	3.9	C
786	STI GLADIATOR IMO 9722170	109,999	2017	250 m	CSSC - 6S60ME-C9	3.9	C
785	STI SANCTITY IMO 9719707	109,999	2013	249 m	MAN - 6G60ME-C9	3.9	C
789	SUNDA IMO 9806146	79,902	2019	219 m	Mitsui - 6S60ME-C8.5	3.9	C
788	PROTEUS ELSIE IMO 9923451	109,999	2023	250 m	Wärtsilä - 6X62DF	3.9	C
794	BANIYAS IMO 9838228	109,994	2017	250 m	CSSC - 6G60ME-C9	3.9	C
793	AL AGAILA IMO 9415404	164,787	2009	274 m	MAN - 6S70MC-C	3.9	C
792	PROTEUS BOHEMIA IMO 9923437	109,999	2020	250 m	Wärtsilä - 6X62DF	3.9	C
791	SAND IMO 9379612	115,878	2009	249 m	MAN - 6S60MC-C	3.9	C
790	NAMRATA IMO 9401154	105,830	2008	244 m	HHI - 6S60MC-C	3.9	C
795	EAGLE KLANG IMO 9417892	107,481	2010	244 m	Mitsui - 6S60MC-C	3.9	C
800	ADVANTAGE SUMMER IMO 9419890	156,527	2010	274 m	Hyundai - 6S70MC-C	3.9	C
799	IONIC ANASSA IMO 9779795	114,718	2016	250 m	Mitsui - 6G60ME-C9.2	3.9	C
798	ALMI HORIZON IMO 9579494	157,787	2011	274 m	Hyundai - 6S70MC-C	3.9	C
797	STI LOMBARD IMO 9708150	109,999	2015	256 m	MAN - 6G60ME-C9	3.9	C
796	ALBERT IMO 9843572	113,095	2019	250 m	Hyundai - 7X62DF	3.9	C

Page 16 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.