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)

#968 of 1,789 oil tankers

CO₂ intensity

4.3 g CO₂/dwt·nm

vs segment average (5.1)

-16% 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
951	HAFNIA NILE IMO 9766217	74,189	2017	228 m	STX - 6G60ME-C9	4.2	C
952	ALPES IMO 9817470	112,504	2018	250 m	Hyundai - 6G60ME-C9	4.2	C
953	AMAX ANTHEM IMO 9472634	116,087	2011	249 m	MAN - 6S60MC-C	4.2	C
954	CL YINGDU IMO 9718064	50,000	2016	183 m	MAN - 6G50ME-B9	4.3	C
955	BUALA IMO 9433585	115,592	2010	249 m	MAN - 6S60MC-C	4.3	C
956	LYRIC CAMELLIA IMO 9730933	109,999	2016	250 m	MAN - 6G60ME-C9	4.3	C
957	SEAJEWEL IMO 9388807	108,889	2009	245 m	MAN - 6S60MC-C	4.3	C
958	GHIBLI IMO 9417799	112,961	2009	250 m	Doosan - 7S60MC-C	4.3	C
959	CALYPSO IMO 9899296	111,930	2021	237 m	MAN - 6G60ME-C9	4.3	C
960	ST. CLEMENS IMO 9790361	49,998	2017	183 m	Hyundai - 6G50ME-B9 (Tier II)	4.3	C
961	STI GRATITUDE IMO 9722182	109,999	2017	250 m	CSSC - 6G60ME-C9	4.3	C
962	MAERSK CAYMAN IMO 9786164	49,919	2018	183 m	STX - 6G50ME-C9	4.3	C
963	MINERVA KYTHNOS IMO 9592252	115,674	2011	249 m	Doosan - 6S60MC-C	4.3	C
964	AMFITRITI IMO 9419369	115,404	2009	250 m	STX - STX MAN B&W 6S60MC-C8	4.3	C
965	ABHA IMO 9400980	105,380	2008	229 m	Mitsui - 6RTA58T	4.3	C
966	MONTEREY IMO 9377779	105,009	2007	244 m	Hudong Heavy Machinery - 6 S 60 MC-C	4.3	C
967	NORDLOTUS IMO 9624067	105,543	2013	229 m	Mitsui - 6S60MC-C	4.3	C
968	VST ELECTRA IMO 9784611	109,986	2017	250 m	DALIAN MARINE - 6G70ME-C9	4.3	C
969	GREEN AZURE IMO 9934644	114,516	2023	250 m	6G60ME-C9-HPSCR	4.3	C
970	NISSOS SERIFOS IMO 9592264	115,688	2012	249 m	Doosan - 6S60MC-C	4.3	C
971	SUNRISE IMO 9761956	74,042	2016	228 m	Hyundai - 6G60ME-C9	4.3	C
972	RAYSUT IMO 9402225	99,995	2009	244 m	Mitsui - 6S60MC-C	4.3	C
973	ALTERA THULE IMO 9895264	147,098	2022	279 m	6G70ME-C9.5-LPSCR	4.3	C
974	CE-BERMUDA IMO 9411226	158,143	2009	274 m	Hyundai - 6S70MC-C	4.3	C
975	EAGLE HATTERAS IMO 9453975	114,028	2010	250 m	Hyundai - 7 S 60 MC	4.3	C
976	AQUALEGACY IMO 9601833	115,763	2012	249 m	Doosan - DOOSAN-MAN 6S60MC-C	4.3	C
977	ATHENS VOYAGER IMO 9337391	105,614	2007	238 m	Diesel United - 6RTA58T	4.3	C
978	HENRIQUE DIAS IMO 9453834	157,055	2014	274 m	Doosan - DOOSAN-MAN 6S70ME-C	4.3	C
979	PACIFIC SAPPHIRE IMO 9893058	113,306	2021	250 m	Wärtsilä - 6X62DF	4.3	C
980	T.KURUCESME IMO 9692478	105,171	2013	244 m	MAN - 6G60ME-C9	4.3	C
981	HAFNIA ANDREA IMO 9688415	50,040	2015	183 m	MAN - 6G50ME-B9	4.3	C
982	SEA FALCON IMO 9346859	110,295	2007	244 m	Mitsui - 7S60MC	4.3	C
983	ORANGE STARS IMO 9433597	115,756	2011	249 m	MAN - 6S60MC-C	4.3	C
984	GEM NO. 3 IMO 9774343	79,920	2014	219 m	Mitsui - 6S60ME-C8.5	4.4	C
985	SAFEEN ELONA IMO 9488011	105,258	2012	245 m	HHI - 6S60MC-C8	4.4	C
986	KMARIN RESPECT IMO 9683001	109,584	2016	250 m	MAN - 6G60ME-C9	4.4	C
987	SUNRAY IMO 9761944	74,039	2016	228 m	Hyundai - 6G60ME-C9	4.4	C
988	SEAWAYS LONSDALE IMO 9697612	49,990	2014	183 m	MAN - 6S50MC-C8	4.4	C
989	YASA GOLDEN BOSPHORUS IMO 9334038	115,867	2007	249 m	MAN - 6S60MC-C	4.4	C
990	PHOENIX ADMIRAL IMO 9482603	114,024	2007	250 m	HHI - 7S60MC-C7	4.4	C
991	ADVANTAGE SUGAR IMO 9410973	156,516	2011	274 m	MAN - 6S70MC-C	4.4	C
992	SEAPRINCESS IMO 9373668	115,948	2005	250 m	Doosan - DOOSAN-MAN B&W 6S60MC-C	4.4	C
993	PENELOP IMO 9325908	115,091	2006	254 m	Sulzer - 6RT-flex68T-B	4.4	C
994	AQUALEGEND IMO 9592240	115,571	2010	249 m	Doosan - 6S60MC-C	4.4	C
995	KAMOME VICTORIA IMO 9584102	74,908	2011	228 m	Mitsui - 6S60MC	4.4	C
996	CLEAROCEAN APOLLON IMO 9850707	113,252	2019	250 m	STX - 6G60ME-C9	4.4	C
997	YASA AQUALINA IMO 9469687	105,304	2011	244 m	Hyundai - 6S90MC-C	4.4	C
998	GRIMSTAD IMO 9336402	105,850	2007	240 m	Mitsui - 6S60MC-C	4.4	C
999	SOUSTA IMO 9384992	106,045	2007	240 m	Mitsui - 6S60MC-C	4.4	C
1000	ASP TREASURES IMO 9732242	115,063	2016	256 m	MAN - 6G60ME-C9	4.4	C

Page 20 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.