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)

#480 of 1,789 oil tankers

CO₂ intensity

3.1 g CO₂/dwt·nm

vs segment average (5.1)

-38% 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
449	MINERVA ASTRA IMO 9893008	115,484	2021	250 m	MAN - 6G60ME-C9	3.1	B
454	STRYMON IMO 9938030	115,429	2022	250 m	MAN - 6G60ME-C9	3.1	B
453	C. INNOVATOR IMO 9595618	313,999	2012	333 m	MAN - 7S80ME-C8	3.1	B
455	PHILOTIMOS IMO 9793997	113,247	2018	250 m	Hyundai - 6G60ME-C9	3.1	B
452	RS TARA IMO 9765354	160,036	2016	274 m	Hyundai - 6S70ME-C9.5	3.1	B
457	DALI IMO 9787936	115,281	2018	250 m	Doosan - 6G60ME-C9	3.1	B
456	FRONT CAPELLA IMO 9790995	111,000	2017	252 m	CSSC - 6G60ME-C9	3.1	B
458	HAFNIA NESO IMO 9800312	109,990	2019	250 m	MAN - 6G60ME-C9	3.1	B
459	PERTAMINA HALMAHERA IMO 9872688	156,586	2020	274 m	MAN - 6G70ME-C9	3.1	B
461	SOLA TS IMO 9724350	112,939	2017	250 m	Hyundai - 6G60ME-C9	3.1	B
460	CRYSTAL IMO 9956020	113,385	2021	240 m	Wärtsilä - 5X72DF	3.1	B
463	PROTEUS IWONA IMO 9914670	109,999	2022	250 m	Wärtsilä - 6X62DF	3.1	B
462	NJORD DF IMO 9953468	114,545	2023	250 m	6G60ME-C9-GI	3.1	B
465	ITHAKI IMO 9526461	299,940	2011	333 m	HHI - 6S90MC-C7	3.1	B
464	CAPTAIN SPIRO IMO 9692856	113,796	2014	252 m	MAN - 6G60ME-C9	3.1	B
466	TORM HOUSTON IMO 9904883	115,414	2022	250 m	MAN - 6G60ME-C9	3.1	B
472	PACIFIC GARNET IMO 9893084	113,306	2021	250 m	Wärtsilä - 6X62DF	3.1	B
468	NAUTILUS I IMO 9298765	163,927	2006	274 m	MAN - 6S70MC-C	3.1	B
467	VST AMARA IMO 9742211	109,990	2017	250 m	DALIAN MARINE - 6G60ME-C9	3.1	B
471	SIENNA IMO 9336971	149,847	2007	274 m	Sulzer - 6RTA72	3.1	B
470	MARLIN LOME IMO 9823572	114,841	2022	250 m	DALIAN MARINE - 6G60ME-C9	3.1	B
469	HAFNIA LILLESAND IMO 9946477	109,999	2024	250 m	6G60ME-C10-GI-HPSCR	3.1	B
474	METRO AEGEAN IMO 9973640	114,934	2024	250 m	6G60ME-C10-HPSCR	3.1	B
473	ALMI GALAXY IMO 9579509	157,787	2012	274 m	Hyundai - 6S70MC-C	3.1	B
475	SESTREA IMO 9406659	158,519	2009	274 m	MAN - 6S70ME-C	3.1	B
476	MARAN HELEN IMO 9779381	156,458	2017	274 m	STX - 6G70ME-C9	3.1	B
477	NISSOS IOS IMO 9886770	157,447	2021	274 m	Hyundai - 6X72	3.1	B
479	FREEPORT STAR IMO 9933212	115,518	2023	250 m	MAN - 6G60ME-C9	3.1	B
478	PACIFIC EMERALD IMO 9893022	113,306	2021	250 m	6X62DF	3.1	B
480	SOUTH LOYALTY IMO 9537769	314,000	2012	332 m	STX - 6S90MC-C	3.1	B
482	GREEN ANAX IMO 9927213	114,405	2023	250 m	6G60ME-C9-HPSCR	3.2	B
481	SEA DRAGON IMO 9903918	114,217	2019	250 m	HSD Engine Co. Ltd. 6G60ME-C9-HPSCR	3.2	B
484	HAFNIA LOIRE IMO 9941697	109,999	2023	250 m	6G60ME-C10-GI-HPSCR	3.2	B
483	PERSEUS STAR IMO 9891684	116,026	2021	250 m	MAN - 6G60ME-C9	3.2	B
488	FREEDOM GLORY IMO 9863417	114,122	2020	250 m	Doosan - 6G60ME-C9	3.2	B
487	ARISTEA IMO 9791315	112,794	2018	250 m	Doosan - 6G60ME-C9	3.2	B
489	LOS ANGELES SPIRIT IMO 9318072	159,233	2007	274 m	Hyundai - 6S70MC-C	3.2	B
486	SEA STAR IMO 9945289	109,999	2023	250 m	6G60ME-C10-HPSCR	3.2	B
490	SEA URCHIN IMO 9886720	114,072	2019	250 m	MAN - 6G60ME-C9	3.2	B
485	STI LOTUS IMO 9838230	109,995	2017	250 m	CSSC - 6G60ME-C9	3.2	B
496	ALMI SKY IMO 9579523	157,787	2012	274 m	Hyundai - 6S70MC-C	3.2	B
498	SEAVOYAGER IMO 9318096	159,233	2007	274 m	Hyundai - 6S70MC-C	3.2	B
497	STATIA IMO 9302982	150,205	2006	274 m	Sulzer - 6RTA72	3.2	B
494	CARIBBEAN VOYAGER IMO 9857860	115,165	2020	250 m	Hyundai - 6G60ME-C9	3.2	B
493	NORDIC CROSS IMO 9438418	158,475	2010	274 m	Doosan - 6S70MC-C	3.2	B
495	FRONT FEATURE IMO 9903970	109,894	2021	249 m	Wärtsilä - 6X62	3.2	B
492	COBALT SUN IMO 9814428	114,395	2015	250 m	CSSC - 6G60ME-C9	3.2	B
491	PINNACLE SPIRIT IMO 9385192	159,995	2008	274 m	MAN - 6S70ME-C	3.2	B
500	KRITI KING IMO 9887255	158,005	2021	274 m	MAN - 6G70ME-C9	3.2	B
499	NOLDE IMO 9787924	115,024	2018	250 m	Doosan - 6G60ME-C9	3.2	B

Page 10 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.