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)

#622 of 1,651 oil tankers

CO₂ intensity

3.5 g CO₂/dwt·nm

vs segment average (5.18)

-33% 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
597	MARAN PLATO IMO 9399507	158,267	2009	274 m	Hyundai - 6S70MC-C	3.4	B
596	FRONT JAGUAR IMO 9703332	109,900	2016	252 m	MAN - 6G60ME-C9	3.4	B
601	SEACHARM IMO 9773765	112,179	2018	237 m	Mitsui - 6G60ME-C9.2	3.4	B
605	IONIC ARIADNE IMO 9856555	112,007	2020	237 m	MAN - 6G60ME-C9	3.5	B
604	TORM GITTE IMO 9426312	119,456	2010	250 m	Hyundai - 6S70MC-C	3.5	B
606	HAFNIA LARISSA IMO 9800300	109,990	2019	250 m	MAN - 6G60ME-C9	3.5	B
607	NAFSIKA IMO 9913511	112,051	2022	237 m	6G60ME-C9-HPSCR	3.5	B
610	PACIFIC EMERALD IMO 9893022	113,306	2021	250 m	6X62DF	3.5	B
609	EAGLE BINTULU IMO 9795074	113,400	2019	250 m	Wärtsilä - 6X62DF	3.5	B
611	NAVIG8 PRESTIGE JKB IMO 9831309	111,000	2019	250 m	CSSC - 6G60ME-C9	3.5	B
608	PEACE VICTORIA IMO 9771028	77,378	2019	228 m	Mitsui - 6S60ME-C9	3.5	B
616	PORTINARI IMO 9547714	115,727	2019	249 m	MAN - 6S60ME-C8	3.5	B
613	HAIFENG IMO 9792840	109,898	2018	250 m	Doosan - 6G60ME-C9.5 (Tier II)	3.5	B
612	SFL THELON IMO 9593000	159,500	2010	274 m	MAN - 6S70MC	3.5	B
615	MARE SICULUM IMO 9457892	158,466	2011	274 m	MAN - 6S70MC-C	3.5	B
614	DELTA IOS IMO 9406685	157,484	2009	274 m	Hyundai - 6S70MC-C	3.5	B
617	TORM GWENDOLYN IMO 9428982	119,456	2010	250 m	Hyundai - 6S70MC-C	3.5	B
619	SEASENATOR IMO 9304368	105,715	2003	241 m	Hitachi - 6S60MC MK6	3.5	B
618	CLEAROCEAN APOLLON IMO 9850707	113,252	2019	250 m	STX - 6G60ME-C9	3.5	B
621	STI PARK IMO 9690793	109,999	2014	256 m	HHI - 6G60ME-C9.2	3.5	B
620	ORPHEAS IMO 9318149	167,282	2007	274 m	Hyundai - 6S70MC-C	3.5	B
623	ARCTIC IMO 9315173	163,216	2007	274 m	Hyundai - 6S70MC-C MK7	3.5	B
622	CLEAROCEAN AJAX IMO 9850692	113,252	2019	250 m	MAN - 6G60ME-C9	3.5	B
627	LEONTIOS H IMO 9724336	113,611	2016	250 m	Hyundai - 6G60ME-C9	3.5	B
626	STI GUIDE IMO 9717113	109,999	2016	250 m	CSSC - 6S60ME-C8	3.5	B
625	ALMI VOYAGER IMO 9579585	157,638	2014	274 m	MAN - 6S70MC-C8	3.5	B
624	SPARTO IMO 9865116	115,468	2020	250 m	Doosan - 6G60ME-C9 (Tier III)	3.5	B
630	AL RUWAIS IMO 9828405	114,695	2021	250 m	DALIAN MARINE - 6G60ME-C9	3.5	B
629	FEZZAN IMO 9888730	114,243	2021	250 m	MAN - 6G60ME-C9	3.5	B
631	CARIBBEAN VOYAGER IMO 9857860	115,165	2020	250 m	Hyundai - 6G60ME-C9	3.5	B
628	SAPPHIRA IMO 9336983	149,876	2008	274 m	Sulzer - 6RTA72	3.5	B
632	ADVANTAGE SWEET IMO 9587192	159,058	2012	274 m	MAN - 6S70MC-C	3.5	B
635	FRONT OCELOT IMO 9726580	109,900	2016	252 m	MAN - 6G60ME-C9	3.5	B
634	SPYROS K IMO 9565948	157,647	2009	274 m	HHI - 6S70MC-C7	3.5	B
633	OTTOMAN INTEGRITY IMO 9530618	149,999	2011	269 m	MAN - 6S70ME-C	3.5	B
636	ALFIOS I IMO 9923009	115,351	2022	250 m	MAN - 6G60ME-C9	3.5	B
642	NAVIG8 PRECISION IMO 9831294	109,994	2018	250 m	CSSC - 6G60ME-C9	3.5	B
641	NEW VISION IMO 9804459	157,617	2018	276 m	Doosan - 6G70ME-C9	3.5	B
640	ELANDRA SOUND IMO 9821706	115,666	2018	250 m	Doosan - 6G60ME-C9	3.5	B
637	SEA DRAGON IMO 9903918	114,217	2019	250 m	HSD Engine Co. Ltd. 6G60ME-C9-HPSCR	3.5	B
639	STRESA IMO 9912866	115,335	2022	250 m	6G60ME-C10.5	3.5	B
638	SEAODYSSEY IMO 9740419	113,176	2017	250 m	CSSC - 6G60ME-C9	3.5	B
645	SEATRUST IMO 9979993	114,449	2022	250 m	MAN - 6G60ME-C10	3.5	B
644	KYRAKATINGO IMO 9779965	113,563	2017	250 m	STX - 6G60ME-C9	3.5	B
643	EAGLE KUANTAN IMO 9417012	107,481	2010	244 m	Mitsui - 6S60MC-C	3.5	B
650	SEABORN IMO 9980007	114,437	2022	250 m	MAN - 6G60ME-C10	3.5	B
649	SANTHIA IMO 9978705	115,062	2024	250 m	MAN - 6G60ME-C10	3.5	B
648	MINERVA BALTICA IMO 9728241	113,172	2018	250 m	Hyundai - 6G60ME-C9	3.5	B
647	HAFNIA LOIRE IMO 9941697	109,999	2023	250 m	6G60ME-C10-GI-HPSCR	3.5	B
646	ARETEA IMO 9711456	113,969	2015	250 m	Doosan - 6G60ME-C9.2	3.5	B

Page 13 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.