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 2024. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2024)

#511 of 1,789 oil tankers

CO₂ intensity

3.2 g CO₂/dwt·nm

vs segment average (5.1)

-37% 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

1,826

vessels ranked

1.36

greenest (g CO₂/t·nm)

4.12

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
501	BOUBOULINA IMO 9298753	163,759	2006	274 m	MAN - 6S70MC-C	3.2	B
500	NOLDE IMO 9787924	115,024	2018	250 m	Doosan - 6G60ME-C9	3.2	B
504	YUAN HE WAN IMO 9845996	113,642	2020	250 m	MAN - 6G60ME-C9	3.2	B
503	FRONT SAVANNAH IMO 9831828	157,270	2019	275 m	Hyundai - 6G70ME-C9	3.2	B
505	MARAN PYTHIA IMO 9402902	158,266	2009	274 m	Hyundai - 6S70MC	3.2	B
510	SEACROSS IMO 9297890	163,292	2003	274 m	Hyundai - HYUNDAI-MAN B&W 6S70MC-C	3.2	B
509	SONANGOL CABINDA IMO 9575589	157,747	2013	274 m	HHI - 6S70MC-C8	3.2	B
508	T.SADBERK IMO 9804136	157,453	2017	277 m	Hyundai - 6G70ME-C9	3.2	B
507	ACHILLEAS IMO 9458494	157,883	2010	274 m	HHI - 6S70MC-C8	3.2	B
506	ELANDRA SOUND IMO 9821706	115,666	2018	250 m	Doosan - 6G60ME-C9	3.2	B
512	EAGLE HALIFAX IMO 9453987	114,062	2010	250 m	MAN - 7S60MC	3.2	B
511	HAFNIA LARISSA IMO 9800300	109,990	2019	250 m	MAN - 6G60ME-C9	3.2	B
515	DF MYSTRAS IMO 9941702	109,999	2023	250 m	MAN - 6G60ME-C10	3.2	B
514	SIKINOS I IMO 9800269	157,007	2018	274 m	CSSC - 6G70ME-C9	3.2	B
513	SEALEGEND IMO 9906568	115,648	2020	250 m	MAN - 6G60ME-C9	3.2	B
517	PARTHENON TS IMO 9724348	113,554	2016	250 m	Hyundai - 6G60ME-C9	3.2	B
516	OTTOMAN INTEGRITY IMO 9530618	149,999	2011	269 m	MAN - 6S70ME-C	3.2	B
521	MILITOS IMO 9607435	164,751	2012	274 m	MAN - 6S70MC-C8	3.2	B
524	DELTA POSEIDON IMO 9468671	157,380	2011	274 m	MAN - 6S70MC-C	3.2	B
520	ELYTIS IMO 9946702	113,839	2024	250 m	CSSC-MES Diesel Co Ltd - China 6X62DF	3.2	B
523	ALFIOS I IMO 9923009	115,351	2022	250 m	MAN - 6G60ME-C9	3.2	B
519	NAFSIKA IMO 9913511	112,051	2022	237 m	6G60ME-C9-HPSCR	3.2	B
518	PROTEUS PHILIPPA IMO 9923425	109,999	2022	250 m	6X62DF-LPSCR	3.2	B
522	RED MOON IMO 9590307	160,024	2012	274 m	MAN - 6S70MC-C8	3.2	B
527	SWORD IMO 9783631	104,027	2018	229 m	Mitsui - 6S60ME-C9.2	3.2	B
529	PEGASUS STAR IMO 9891672	116,120	2021	250 m	MAN - 6G60ME-C9	3.2	B
526	NORDMARLIN IMO 9779989	113,959	2017	250 m	Doosan - 6G60ME-C9	3.2	B
525	ADVANTAGE LOVE IMO 9708552	110,000	2015	250 m	MAN - 6G60ME-C9	3.2	B
528	DELTA SKY IMO 9410181	166,092	2009	274 m	Hyundai - 6S70MC-C	3.2	B
530	PROTEUS STEPHANIE IMO 9914694	109,999	2022	250 m	Wärtsilä - 6X62DF	3.3	B
532	BREEZE IMO 9809356	156,682	2018	277 m	Hyundai - 6X72	3.3	B
535	JILL GLORY IMO 9959917	115,415	2021	250 m	MAN - 6G60ME-C10	3.3	B
534	EAGLE BARCELONA IMO 9795048	113,400	2015	250 m	Doosan - 6G60ME-C9.5 (Tier II)	3.3	B
533	HAFNIA LANGUEDOC IMO 9941685	109,999	2023	250 m	6G60ME-C10-GI-HPSCR	3.3	B
531	OSLO TS IMO 9737383	112,949	2017	250 m	Hyundai - 6G60ME-C9	3.3	B
536	LORAX IMO 9903413	109,990	2022	237 m	Hitachi - 6G60ME-C9	3.3	B
537	THORNBURY IMO 9910533	112,066	2022	237 m	6G60ME	3.3	B
541	TP AFFINITY IMO 9645401	114,070	2016	252 m	Hyundai - 6X62	3.3	B
540	DF MONTMARTE IMO 9941714	109,999	2023	250 m	MAN - 6G60ME-C10	3.3	B
539	VILAMOURA IMO 9529293	158,621	2011	274 m	Doosan - 6S70MC-C MK8	3.3	B
538	KINYRAS IMO 9320714	166,467	2007	285 m	MAN - 6S70MC-C	3.3	B
544	MARLIN LORETO IMO 9823558	114,823	2021	250 m	STX - 6G60ME-C9	3.3	B
543	DELTA COMMANDER IMO 9418157	157,476	2010	274 m	MAN - 6S70MC-C	3.3	B
542	COPPER SPIRIT IMO 9427639	156,827	2010	274 m	MAN - 6S70MC-C	3.3	B
548	YAMATO SPIRIT IMO 9414503	107,617	2008	244 m	MAN - 6S60MC-C	3.3	B
547	SEA TURTLE IMO 9886718	114,085	2021	250 m	MAN - 6G60ME-C9	3.3	B
546	IKARA IMO 9321718	158,880	2006	274 m	MAN - 6S70ME-C	3.3	B
545	MALIBU IMO 9776731	158,692	2017	279 m	Doosan - 6S70MC-C8	3.3	B
550	TORM GRACE IMO 9531648	119,456	2012	250 m	Hyundai - 6S70MC-C	3.3	B
549	SEARHYTHM IMO 9880350	111,963	2021	237 m	MAN - 6G60ME-C9	3.3	B

Page 11 of 36 — 1,789 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 2024 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.