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)

#547 of 1,651 oil tankers

CO₂ intensity

3.3 g CO₂/dwt·nm

vs segment average (5.18)

-36% 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
500	ALMI EXPLORER IMO 9579547	157,787	2013	274 m	Hyundai - 6S70MC-C	3.3	B
504	TORTUGA IMO 9998547	115,302	2025	250 m	MAN-B&W 6G60ME-C10	3.3	B
503	PEGASUS STAR IMO 9891672	116,120	2021	250 m	MAN - 6G60ME-C9	3.3	B
502	OCEANIA IMO 9905344	163,085	2022	274 m	6G70ME-C10-HPSCR	3.3	B
511	ADEBOLA ADELINE IMO 9427627	156,813	2006	274 m	Doosan - DOOSAN-MAN B&W 6S70MC-C	3.3	B
510	BEIJING SPIRIT IMO 9418597	156,493	2010	274 m	MAN - 6S70MC-C	3.3	B
509	FRONT CAPELLA IMO 9790995	111,000	2017	252 m	CSSC - 6G60ME-C9	3.3	B
508	VST OCEANIA IMO 9740469	109,985	2017	250 m	DALIAN MARINE - 6G60ME-C9	3.3	B
507	ANDROMEDA IMO 9943061	114,811	2023	244 m	6G60ME-C9.5	3.3	B
506	EBN HAWKEL IMO 9874507	112,003	2021	237 m	MAN - 6G60ME-C9.2	3.3	B
513	ATLANTIC EMERALD IMO 9892975	109,201	2022	250 m	Hyundai Heavy Industries Co. Ltd. 6G60ME-C9.5	3.3	B
512	SOLA TS IMO 9724350	112,939	2017	250 m	Hyundai - 6G60ME-C9	3.3	B
505	TORM HELENE IMO 9904871	115,575	2021	250 m	CSSC - 6G60ME-C9	3.3	B
515	BERKELEY SQUARE IMO 1027914	113,903	2025	249 m	MAN-B&W 6G60ME-C10	3.3	B
517	ADVANTAGE SPICE IMO 9419888	156,657	2006	274 m	MAN - 6S70MC-C	3.3	B
514	SEA TURTLE IMO 9886718	114,085	2021	250 m	MAN - 6G60ME-C9	3.3	B
520	HUMBLE WARRIOR IMO 9856361	149,990	2020	277 m	Hyundai - 6G70ME-C9	3.3	B
519	NOUNOU IMO 9960980	115,322	2023	250 m	MAN - 6G60ME-C10	3.3	B
518	GHAT IMO 9930105	115,519	2022	250 m	6G60ME-C9-EGRBP	3.3	B
516	SFL TUCANA IMO 9978327	109,895	2024	250 m	6G60ME-C10-HPSCR	3.3	B
521	ACHILLEAS IMO 9458494	157,883	2010	274 m	HHI - 6S70MC-C8	3.3	B
523	ABLIANI IMO 9693068	109,999	2013	250 m	Doosan - 6G60ME-C9	3.3	B
522	CRYSTAL IMO 9956020	113,385	2021	240 m	Wärtsilä - 5X72DF	3.3	B
526	LYRIC MAGNOLIA IMO 9734408	109,999	2016	250 m	MAN - 6G60ME-C9	3.3	B
525	SEA STAR IMO 9945289	109,999	2023	250 m	6G60ME-C10-HPSCR	3.3	B
527	BELGRAVE SQUARE IMO 1027926	113,804	2025	249 m	MAN-B&W 6G60ME-C10	3.3	B
524	IONIC ANAX IMO 9802152	114,720	2017	250 m	Mitsui - 6G60ME-C9	3.3	B
528	CAPTAIN PARIS IMO 9692844	113,876	2014	252 m	HHI - 6G60ME-C9.2	3.3	B
529	DELTA POSEIDON IMO 9468671	157,380	2011	274 m	MAN - 6S70MC-C	3.3	B
531	HENRIQUE DIAS IMO 9453834	157,055	2014	274 m	Doosan - DOOSAN-MAN 6S70ME-C	3.3	B
534	BOSSA NOVA SPIRIT IMO 9637703	154,199	2013	282 m	Doosan - 6S70ME-C 8.2	3.3	B
533	SIGRUN IMO 9612052	156,092	2013	274 m	Mitsui - 6S70MC-C8	3.3	B
532	EAGLE BRASILIA IMO 9795062	114,000	2019	250 m	Wärtsilä - 6X62DF	3.3	B
535	HANOVER SQUARE IMO 9783992	114,366	2019	250 m	CSSC - 6G60ME-C9	3.3	B
530	RESILIENT WARRIOR IMO 9856359	149,990	2020	277 m	Hyundai - 6G70ME-C9	3.3	B
536	SEMAKAU SPIRIT IMO 9833723	115,643	2019	250 m	MAN - 6G60ME-C9	3.3	B
537	ROBOLA IMO 1021790	113,613	2023	249 m	MAN-B&W 6G60ME-C10	3.3	B
538	LIPARI IMO 9529487	158,237	2012	274 m	Doosan - 6S70MC-C	3.3	B
542	TORM HANNAH IMO 9712864	109,999	2016	250 m	MAN - 6S60ME-C8	3.3	B
541	SEA PANTHER IMO 9802164	114,723	2018	250 m	Mitsui - 6G60ME-C9	3.3	B
540	AIFANOURIOS IMO 9891696	116,015	2021	250 m	6G60ME-C9-HPSCR	3.3	B
539	RYMAN IMO 9777931	113,000	2017	250 m	Hyundai - 6G60ME-C9	3.3	B
546	MARLIN LAGOS IMO 9823584	114,853	2022	250 m	DALIAN MARINE - 6G60ME-C9	3.3	B
545	FRONT CHEETAH IMO 9686637	109,900	2016	250 m	MAN - 6S60ME-C8	3.3	B
544	DELTA MED IMO 9412309	161,653	2010	274 m	MAN - 6S70MC-C	3.3	B
543	SEA GARNET IMO 9772943	158,454	2015	274 m	Hyundai - 6X72	3.3	B
550	ORCHID SPIRIT IMO 9901867	112,750	2021	250 m	MAN - 6G60ME-C9	3.3	B
549	SABRINA GLORY IMO 9959929	115,397	2024	250 m	MAN - 6G60ME-C10	3.3	B
548	JARNAIN IMO 9823546	114,831	2021	250 m	DALIAN MARINE - 6G60ME-C9	3.3	B
547	SFL TAURUS IMO 9978339	109,895	2024	250 m	6G60ME-C10-HPSCR	3.3	B

Page 11 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.