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)

#1,018 of 1,789 oil tankers

CO₂ intensity

4.5 g CO₂/dwt·nm

vs segment average (5.1)

-12% 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
1001	ASP TREASURES IMO 9732242	115,063	2016	256 m	MAN - 6G60ME-C9	4.4	C
1002	CLEAROCEAN GINKGO IMO 9916604	50,000	2021	183 m	6G50ME-C9.6	4.4	C
1003	HIGH MARINER IMO 9812755	51,492	2017	186 m	Mitsui - 7S50ME-B9	4.4	C
1004	BRIOLETTE IMO 9524982	104,588	2011	229 m	Mitsui - 6S60MC-C	4.4	C
1005	OKEE JOHN T IMO 9311036	53,712	2006	186 m	Mitsubishi - 6UEC60LS	4.4	C
1006	MINERVA SOPHIA IMO 9382762	115,748	2009	249 m	MAN - 6S60MC-C	4.4	C
1007	P. SOPHIA IMO 9414034	105,071	2009	244 m	HHI - 6S60MC-C8	4.4	C
1008	STI ROSE IMO 9696682	109,999	2015	256 m	MAN - 6G60ME-C9	4.4	C
1009	KMARIN REGARD IMO 9683063	109,543	2016	250 m	STX - 6G60ME-C9	4.4	C
1010	EAGLE KANGAR IMO 9417024	107,481	2010	244 m	Mitsui - 6S60MC-C	4.4	C
1011	CIELO DI HOUSTON IMO 9791860	74,999	2019	228 m	MAN - 6G70ME-C9	4.4	C
1012	ROWAN IMO 9291262	114,834	2005	253 m	MAN - 7S60ME-C	4.4	C
1013	MYRTOS IMO 9389100	106,750	2009	244 m	MAN - 6S60MC-C	4.4	C
1014	SEA STAR IMO 9607710	112,147	2010	250 m	HHI - 7S60MC-C8.1	4.4	C
1015	BANI YAS IMO 9487249	74,913	2010	228 m	MAN - 6S60MC-C	4.4	C
1016	OCEAN PHOENIX IMO 9388728	108,941	2007	245 m	DALIAN MARINE - 6 S 60 MC-C	4.5	C
1017	NEW LIBERTY IMO 9411082	164,028	2010	275 m	MAN - 6S70MC	4.5	C
1018	DUCHESS OF DORIA IMO 9403346	53,603	2009	186 m	Mitsubishi - 6UEC60LS	4.5	C
1019	SOLOMON SEA IMO 9760500	106,359	2016	229 m	Mitsui - 6S60ME-C8	4.5	C
1020	SAETTA IMO 9384069	107,023	2009	244 m	Hudong Heavy Machinery - 6 S 60 MC-C	4.5	C
1021	ALTERA WAVE IMO 9863558	103,158	2021	245 m	Wärtsilä - 8L34DF	4.5	C
1022	SEAOATH IMO 9290361	105,472	2005	244 m	Hyundai - HHI MAN B&W 6S60MC	4.5	C
1023	KMARIN RESOURCE IMO 9683037	109,483	2016	250 m	MAN - 6G60ME-C9	4.5	C
1024	ARCHANGEL IMO 9302592	163,216	2006	274 m	Hyundai - 6S70MC-C	4.5	C
1025	ADVANTAGE SPRING IMO 9466582	156,596	2010	274 m	MAN - 6S70MC	4.5	C
1026	MAERSK TOKYO IMO 9718076	50,000	2016	183 m	MAN - 6G50ME-B9	4.5	C
1027	AEGEAN NOBILITY IMO 9345441	115,814	2007	249 m	MAN - 6S60MC-C	4.5	C
1028	MINERVA KALLISTO IMO 9853008	113,000	2019	244 m	Doosan - 6G60ME-C9.5-Tier III	4.5	C
1029	MAERSK CORSICA IMO 9786188	49,919	2019	183 m	STX - 6G50ME-C9	4.5	C
1030	STI CONDOTTI IMO 9690810	109,999	2013	256 m	HHI - 6G60ME-C9.2	4.5	C
1031	HAFNIA LYNX IMO 9635808	49,999	2013	183 m	Doosan - 6S50MC-C8	4.5	C
1032	DAYTONA IMO 9528043	115,896	2011	249 m	Doosan - DOOSAN-MAN B&W 7S60MC-C MK7	4.5	C
1033	MINERVA ALICE IMO 9309435	114,850	2006	254 m	Sulzer - 6RT-flex68T-B	4.5	C
1034	TORM GWYNETH IMO 9429003	118,897	2010	250 m	Hyundai - 6S70MC-C	4.5	C
1035	CONQUEST IMO 9308089	73,917	2006	229 m	Hudong Heavy Machinery - 5S60MC-C MK7	4.5	C
1036	BUDDHA IMO 9283306	109,637	2004	245 m	Sulzer - 7RTA62U	4.5	C
1037	CL XUNYANG IMO 9718088	50,000	2013	183 m	STX - 6G50ME-B9	4.5	C
1038	ANDEAN SUN IMO 9911525	49,999	2022	186 m	6G50ME-C9-LGIM	4.5	C
1039	ORIENT INNOVATION IMO 9793387	49,997	2017	183 m	Hyundai - 6G50ME-B9	4.6	C
1040	HAFNIA EXPERIENCE IMO 9735610	74,669	2016	219 m	MAN - 6S60ME-C8	4.6	C
1041	HELLAS MARIANNA IMO 9798076	49,850	2018	183 m	Hyundai - 6G50ME-B9	4.6	C
1042	STI SLOANE IMO 9690808	114,000	2013	256 m	HHI - 6G60ME-C9.2	4.6	C
1043	COROSSOL IMO 9395331	106,898	2010	244 m	Hudong Heavy Machinery - 6 S 60 MC-C	4.6	C
1044	MAERSK CAPRI IMO 9786140	49,919	2018	183 m	STX - 6G50ME-C9	4.6	C
1045	ALFA ALANDIA IMO 9752797	106,324	2016	229 m	MAN - 6S60MC-C	4.6	C
1046	MINERVA NOUNOU IMO 9309423	114,850	2006	254 m	Wärtsilä - 6RT-flex68T-B	4.6	C
1047	PGC COMPANION IMO 9282625	72,825	2005	229 m	Hudong Heavy Machinery - 5S60MC-C	4.6	C
1048	HELLAS AVATAR IMO 9722613	49,997	2015	183 m	MAN - 6G50ME-B9	4.6	C
1049	BLUEBIRD IMO 9737515	74,074	2016	228 m	Yuchai Marine Power Co. Ltd. 6RT-flex58T-D	4.6	C
1050	ARK IMO 9313486	105,804	2008	240 m	MAN - 6S60ME-C	4.6	C

Page 21 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.