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)

#596 of 1,651 oil tankers

CO₂ intensity

3.4 g CO₂/dwt·nm

vs segment average (5.18)

-34% 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
551	RAVA IMO 9796743	114,385	2017	250 m	Doosan - 6G60ME-C9	3.4	B
553	NEW AMORGOS IMO 9370836	107,510	2008	244 m	Mitsui - MITSUI MAN B&W 6S60MC-C	3.4	B
552	AL BATEEN IMO 9828376	114,637	2020	250 m	DALIAN MARINE - 6G60ME-C9	3.4	B
557	ITHAKI DF IMO 9953494	114,598	2024	250 m	6G60ME-C9-GI	3.4	B
556	TORM KIARA IMO 9701554	114,270	2015	252 m	Hyundai - 6X62	3.4	B
555	NEWBURY IMO 9920497	112,095	2022	237 m	MAN - 6G60ME-C9	3.4	B
554	ELANDRA SWIFT IMO 9945306	109,999	2024	250 m	6G60ME-C10-HPSCR	3.4	B
558	FRONT FUSION IMO 9887803	109,899	2021	250 m	Wärtsilä - 6X62	3.4	B
562	SONANGOL NAMIBE IMO 9325049	158,425	2007	274 m	MAN - 6S70MC	3.4	B
561	SEA VOYAGER IMO 9408310	107,506	2006	244 m	Mitsui - MITSUI MAN B&W 6S60MC-C	3.4	B
560	AGIOS GERASIMOS IMO 9693056	109,999	2015	250 m	Doosan - 6G60ME-C9	3.4	B
559	NOLDE IMO 9787924	115,024	2018	250 m	Doosan - 6G60ME-C9	3.4	B
563	OCEAN BLUE IMO 9955997	113,385	2021	240 m	Wärtsilä - 5X72DF	3.4	B
565	PROMETHEUS LIGHT IMO 9801976	114,601	2019	250 m	MAN - 6G60ME-C9	3.4	B
564	SEAWAYS COLORADO IMO 9594767	158,614	2010	274 m	Doosan - 6S70MC-C	3.4	B
571	ARDAS I IMO 9930624	115,335	2023	250 m	MAN - 6G60ME-C9	3.4	B
570	CAP FELIX IMO 9380738	158,765	2008	274 m	MAN - 6S70MC-C	3.4	B
569	OSLO TS IMO 9737383	112,949	2017	250 m	Hyundai - 6G60ME-C9	3.4	B
568	RELIABLE WARRIOR IMO 9753557	159,058	2014	274 m	Hyundai - 6G70ME-C9	3.4	B
567	ON PRECIOUS IMO 9893216	114,623	2021	250 m	Hyundai - 6G60ME-C9	3.4	B
566	SEAGALAXY IMO 9847231	114,426	2019	250 m	Mitsui - 6G60ME-C9.5	3.4	B
572	ANTARCTIC IMO 9315185	163,216	2007	274 m	Hyundai - 6S70MC-C MK7	3.4	B
576	TATAKI IMO 9410210	162,187	2006	276 m	HHI - 6S70MC-C7	3.4	B
578	FRONT ALTAIR IMO 9745902	109,894	2016	252 m	CSSC - 6G60ME-C9.2 (Tier II)	3.4	B
574	PISSIOTIS IMO 9509023	149,998	2006	276 m	HHI - 6S70MC-C7	3.4	B
573	STI MADISON IMO 9688831	109,999	2014	256 m	HHI - 6G60ME-C9.2	3.4	B
577	STI SLOANE IMO 9690808	114,000	2013	256 m	HHI - 6G60ME-C9.2	3.4	B
575	FLAVIN IMO 9787912	115,125	2018	250 m	Doosan - 6G60ME-C9	3.4	B
580	HAFNIA TRITON IMO 9800336	109,990	2019	250 m	STX - 6G60ME-C9	3.4	B
579	METRO AEGEAN IMO 9973640	114,934	2024	250 m	6G60ME-C10-HPSCR	3.4	B
581	RIVERA IMO 9777943	113,000	2015	250 m	Hyundai - 6G60ME-C9	3.4	B
582	DELTA SUPREME IMO 9585895	159,031	2012	274 m	Doosan - 6S70ME-C8	3.4	B
583	YAMATO SPIRIT IMO 9414503	107,617	2008	244 m	MAN - 6S60MC-C	3.4	B
587	ESTRELLA IMO 9696761	106,282	2014	229 m	Mitsui - 6S60MC-C8	3.4	B
586	STI ROSE IMO 9696682	109,999	2015	256 m	MAN - 6G60ME-C9	3.4	B
585	IONIC ARTEMIS IMO 9426441	107,605	2009	244 m	MAN - 6S60MC	3.4	B
584	MARAN PYTHIA IMO 9402902	158,266	2009	274 m	Hyundai - 6S70MC	3.4	B
589	SEASCOUT IMO 9997957	113,814	2025	250 m	MAN-B&W 6G60ME-C10	3.4	B
592	DELTA HARMONY IMO 9408463	157,410	2009	274 m	Hyundai - 6S70MC-C	3.4	B
594	MARITIME GLORY IMO 9863429	114,122	2021	250 m	Doosan - 6G60ME-C9	3.4	B
591	PARTHENON TS IMO 9724348	113,554	2016	250 m	Hyundai - 6G60ME-C9	3.4	B
595	YUAN TANG WAN IMO 9846005	113,683	2020	250 m	MAN - 6G60ME-C9	3.4	B
590	VST ELECTRA IMO 9784611	109,986	2017	250 m	DALIAN MARINE - 6G70ME-C9	3.4	B
588	LOVELY LADY IMO 9960978	115,322	2023	250 m	MAN - 6G60ME-C10	3.4	B
593	PROMETHEUS ENERGY IMO 9801988	114,459	2019	250 m	MAN - 6G60ME-C9	3.4	B
600	PHAETHON IMO 9412098	158,267	2009	274 m	Hyundai - 6S70MC	3.4	B
599	GEMINI SUN IMO 9343340	115,577	2008	244 m	Mitsui - 6S60MC-C	3.4	B
598	CAPTAIN JOHN IMO 9692832	113,876	2014	252 m	HHI - 6G60ME-C9.2	3.4	B
597	MARAN PLATO IMO 9399507	158,267	2009	274 m	Hyundai - 6S70MC-C	3.4	B
596	FRONT CASTOR IMO 9780251	111,088	2017	252 m	CSSC - 6G60ME-C9	3.4	B

Page 12 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.