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)

#1,147 of 1,789 oil tankers

CO₂ intensity

5.0 g CO₂/dwt·nm

vs segment average (5.1)

-2% 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
1101	CASPIAN SEA IMO 9829095	114,218	2019	249 m	MAN - 6G60ME-9.5 (Tier III)	4.8	D
1102	SEASTAR IMO 9373656	116,049	2008	250 m	Doosan - 6S60MC-C	4.8	D
1103	OHIO IMO 9417440	105,188	2009	244 m	Hyundai - 6S90MC-C	4.8	D
1104	CABO FUJI IMO 9730878	74,246	2017	228 m	Doosan - 6G60ME-C9	4.8	D
1105	ATROTOS IMO 9953432	50,113	2023	183 m	6G50ME-C9-HPSCR	4.8	D
1106	OLYMPIC SEA IMO 9489285	104,808	2008	244 m	Hudong Heavy Machinery - 6 S 60 MC-C	4.8	D
1107	STI DONALD C TRAUSCHT IMO 9794422	51,260	2017	183 m	Hyundai - 6S50ME-B9	4.8	D
1108	CURRENT SPIRIT IMO 9843924	129,801	2020	277 m	Wärtsilä - 2 x 12V34DF, 2 x 9L34DF	4.8	D
1109	AL ADAILIAH IMO 9856684	48,578	2020	183 m	Hyundai - 6G50ME-C9	4.8	D
1110	STI MERAUX IMO 9681118	50,300	2012	183 m	HHI - 6S50ME-B9.2	4.8	D
1111	FLAGSHIP SAGE IMO 9471329	74,158	2011	229 m	Doosan - MAN 6S60MC-C	4.8	D
1112	HAFNIA OSPREY IMO 9682241	49,999	2015	183 m	MAN - 6S50MC-C8	4.8	D
1113	MARALTA IMO 9324320	74,999	2007	228 m	DALIAN MARINE - 6S60MC	4.8	D
1114	ALIAI IMO 9884813	50,315	2021	183 m	MAN - 6G50ME-C9	4.8	D
1115	TORM SUCCESS IMO 9836048	49,976	2019	183 m	MAN - 6G50ME-C9	4.8	D
1116	KRITI LEGEND IMO 9398266	107,518	2009	244 m	Mitsui - 6S60MC	4.8	D
1117	JAG PRERANA IMO 9321952	47,848	2007	183 m	MAN - 6S50MC-C	4.9	D
1118	HELLESPONT PROMISE IMO 9351438	73,669	2007	229 m	Hudong Heavy Machinery - HHM-MAN B&W 5S60MC-C.	4.9	D
1119	LONE STAR MARINER IMO 9902859	50,275	2021	183 m	MAN - 6G50ME-C9	4.9	D
1120	PROPONTIS IMO 9305623	117,055	2006	250 m	Hyundai - 6S70MC-C	4.9	D
1121	ENERGY ARTEMIS IMO 9928750	49,812	2022	183 m	STX Engine Co. Ltd. 6G50ME-C9-HPSCR	4.9	D
1122	SIFSAFAH IMO 9856713	48,578	2020	183 m	Hyundai - 6G50ME-C9	4.9	D
1123	IRINI IMO 9934890	49,990	2022	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9-HPSCR	4.9	D
1124	MARI JONE IMO 9725316	49,999	2016	186 m	Hyundai - 6G50ME-B9.3-LGI (Tier-II)	4.9	D
1125	VOULA IMO 9488413	73,774	2006	229 m	Hudong Heavy Machinery - 5S60MC-C	4.9	D
1126	LARGO EXCELLENCE IMO 9935923	49,999	2023	183 m	6G50ME-C9.5	4.9	D
1127	BULL IMO 9292503	115,515	2005	250 m	HSD Engine Co. Ltd. 7S60MC-C	4.9	D
1128	SHAHRAZAD IMO 9389863	74,999	2009	228 m	Hyundai - 6S60MC-C	4.9	D
1129	HAFNIA THALASSA IMO 9800324	109,990	2019	250 m	MAN - 6G60ME-C9	4.9	D
1130	MAERSK CRETE IMO 9786190	49,919	2019	183 m	STX - 6G50ME-C9	4.9	D
1131	AKTEA IMO 9326512	51,371	2009	183 m	Ssangyong - 7S50MC-C	4.9	D
1132	HAFNIA LIONESS IMO 9675509	49,999	2014	183 m	Doosan - 6S50MC-C8	4.9	D
1133	RICH HARVEST IMO 9908982	50,446	2021	183 m	Hyundai - 6G50ME-C9	5.0	D
1134	NORD VULCAN IMO 9982524	49,999	2024	183 m	6G50ME-C9-HPSCR	5.0	D
1135	VALFOGLIA IMO 9417309	109,060	2009	243 m	MAN - 7S60MC	5.0	D
1136	EVRIDIKI IMO 9358929	73,740	2008	229 m	Hyundai - 5 S 60 MC-C	5.0	D
1137	WECO PISCES IMO 9923932	49,999	2022	183 m	6G50ME-C9.5-HPSCR	5.0	D
1138	SILVER MUNA IMO 9718856	50,000	2016	183 m	MAN - 6G50ME-B9	5.0	D
1139	PACIFIC MOONSTONE IMO 9892078	50,192	2021	183 m	MAN - 6G50ME-C9	5.0	D
1140	P. ALIKI IMO 9460136	105,304	2010	244 m	Hyundai - 6S90MC-C	5.0	D
1141	CLEAROCEAN MAVERICK IMO 9900825	49,999	2021	183 m	Hyundai - 6G50ME-C9	5.0	D
1142	SAVIR TIGER IMO 9388730	108,941	2005	245 m	Hudong Heavy Machinery - 6 S 60 MC-C	5.0	D
1143	ADVANTAGE ATOM IMO 9472622	116,014	2011	249 m	MAN - 6S60MC-C	5.0	D
1144	ALATAU IMO 9416551	115,896	2009	250 m	Doosan - 6S60MC-C	5.0	D
1145	MONTEGO IMO 9297553	108,402	2006	247 m	Hyundai - HYUNDAI MAN - B&W 7S60MC-C	5.0	D
1146	SEMERU IMO 9388376	105,777	2008	244 m	HHI - HYUNDAI MAN - B&W 6S60MC-C	5.0	D
1147	STAVANGER PRIDE IMO 9856062	49,999	2020	183 m	Hyundai - 6G50ME-C9	5.0	D
1148	CL VIRGINIA WOOLF IMO 9943396	49,359	2024	183 m	MAN - 6G50ME-C9	5.0	D
1149	EUROPE I IMO 9905332	163,136	2022	274 m	6G70ME-C10-HPSCR	5.0	D
1150	TORM BIRGITTE IMO 9664720	49,995	2012	183 m	STX - 6S50ME-C	5.0	D

Page 23 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.