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)

#894 of 1,789 oil tankers

CO₂ intensity

4.1 g CO₂/dwt·nm

vs segment average (5.1)

-20% 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
851	ADVANTAGE START IMO 9466570	156,644	2011	274 m	MAN - 6S70MC-C	4.0	C
852	STI JERMYN IMO 9722596	109,999	2016	256 m	MAN - 6G60ME-C9	4.0	C
853	WHISTLER SPIRIT IMO 9417323	109,011	2006	243 m	Hudong Heavy Machinery - 7S60MC MK	4.0	C
854	JATULI IMO 9892444	112,459	2021	249 m	MAN - 6G60ME-C9	4.0	C
855	JAG LOKESH IMO 9390599	105,599	2009	244 m	HHI - 6S60MC-C7	4.0	C
856	STI ELYSEES IMO 9688829	109,999	2014	256 m	HHI - 6G60ME-C9.2	4.0	C
857	TORM GWENDOLYN IMO 9428982	119,456	2010	250 m	Hyundai - 6S70MC-C	4.0	C
858	TONY IMO 9432036	162,342	2010	274 m	Hyundai - 6S70MC	4.0	C
859	STI MADISON IMO 9688831	109,999	2014	256 m	HHI - 6G60ME-C9.2	4.0	C
860	CLIO IMO 9396660	112,705	2008	250 m	HHI - 7S60MC-C7	4.0	C
861	YASA GOLDEN DARDANELLES IMO 9339985	110,828	2008	246 m	Mitsui - 7S60MC	4.0	C
862	MARI BOYLE IMO 9732979	49,999	2016	186 m	Hyundai - 6G50ME-B9.3-LGI (Tier-II)	4.0	C
863	STI SOLIDARITY IMO 9708576	109,999	2015	250 m	MAN - 6G60ME-C9	4.0	C
864	AMAZON VIRTUE IMO 9660360	72,412	2012	228 m	HHI - 5G60ME-C9.2	4.0	C
865	STI BROADWAY IMO 9690846	109,999	2014	256 m	Doosan - 6G60ME-C	4.0	C
866	SEALOYALTY IMO 9783928	108,610	2018	244 m	Mitsui - 6G60ME-C9	4.0	C
867	SFL LION IMO 9664770	115,162	2012	250 m	MAN - 6S60ME-C8	4.0	C
868	LEONTIOS H IMO 9724336	113,611	2016	250 m	Hyundai - 6G60ME-C9	4.0	C
869	CAPRICORN SUN IMO 9333785	115,577	2007	244 m	Mitsui - 6S60MC-C	4.0	C
870	TORM SOVEREIGN IMO 9797723	49,999	2015	183 m	Hyundai - 6G50ME-B9	4.0	C
871	AGISTRI IMO 9597018	158,464	2012	274 m	Hyundai - 6S70MC-C8	4.0	C
872	BAHRA IMO 9595008	110,761	2012	250 m	MAN - 6S60ME-C	4.0	C
873	BELMAR IMO 9516959	115,903	2011	249 m	MAN - 7S60MC-C	4.0	C
874	CL FUGOU IMO 9732931	50,000	2017	183 m	STX - 6G50ME-B9	4.0	C
875	TORM GANGA IMO 9461831	119,456	2010	250 m	Hyundai - 6S70MC-C	4.0	C
876	ALMI EXPLORER IMO 9579547	157,787	2013	274 m	Hyundai - 6S70MC-C	4.0	C
877	ASPEN IMO 9818058	112,459	2019	250 m	Hyundai - 6G60ME-C9	4.0	C
878	STI VENETO IMO 9690822	109,999	2015	256 m	MAN - 6G60ME-C9	4.0	C
879	AL DASMA IMO 9653446	109,719	2014	250 m	Hyundai - 6RT-flex58T-E	4.0	C
880	DUBAI GREEN IMO 9298674	74,999	2005	228 m	MAN - 6S60MC-C	4.0	C
881	JAG LEELA IMO 9568184	105,525	2011	244 m	HHI - 6S60MC-C8	4.0	C
882	STI GLADIATOR IMO 9722170	109,999	2017	250 m	CSSC - 6S60ME-C9	4.0	C
883	STI WINNIE IMO 9696709	109,999	2015	256 m	MAN - 6G60ME-C9	4.0	C
884	FPMC P HERO IMO 9457610	114,380	2006	244 m	Mitsui - 6S60MC-C	4.0	C
885	FPMC P IDEAL IMO 9459709	109,994	2012	244 m	Mitsui - 6S60MC-C	4.1	C
886	SFL PUMA IMO 9664794	115,054	2015	250 m	MAN - 6S60ME-C8	4.1	C
887	SAMURAI IMO 9378876	149,993	2009	274 m	Sulzer - 6RTA72	4.1	C
888	ADVANTAGE PORTOFINO IMO 9794836	75,343	2018	228 m	MAN - 6S60ME- C8.5	4.1	C
889	HAIMA IMO 9397896	104,991	2009	246 m	Mitsui - 7S60MC	4.1	C
890	SEAVELVET IMO 9843211	111,964	2020	237 m	Hitachi - 6G60ME-C9	4.1	C
891	ALFA BALTICA IMO 9696773	106,373	2015	229 m	Mitsui - 6S60MC-C8	4.1	C
892	ALQADISIA IMO 9343352	115,577	2008	244 m	Mitsui - 6S60MC-C	4.1	C
893	JAG AABHA IMO 9388948	74,840	2008	228 m	MAN - 6S60MC-C	4.1	C
894	HAIGUI IMO 9505821	114,900	2013	249 m	Doosan - 6S60MC-C	4.1	C
895	ADVANTAGE SOLAR IMO 9408683	156,644	2009	274 m	Hyundai - 6S70MC-C	4.1	C
896	OLYMPIC FLAG IMO 9271341	155,009	2004	274 m	Mitsubishi - 7UEC68LSE	4.1	C
897	SEAGUARDIAN IMO 9891919	112,157	2021	237 m	Hitachi - 6G60ME-C9	4.1	C
898	STI STEADFAST IMO 9719719	109,999	2016	250 m	MAN - 6G60ME-C9	4.1	C
899	KYRAKATINGO IMO 9779965	113,563	2017	250 m	STX - 6G60ME-C9	4.1	C
900	IONIC ASPIS IMO 9523287	107,508	2011	244 m	MAN - 6S60MC-C	4.1	C

Page 18 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.