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 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2025)

#965 of 1,651 oil tankers

CO₂ intensity

4.4 g CO₂/dwt·nm

vs segment average (5.18)

-15% 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

1,685

vessels ranked

1.32

greenest (g CO₂/t·nm)

4.01

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
951	NISSOS PAROS IMO 9592290	115,722	2010	249 m	Doosan - 6S60MC-C	4.3	C
952	CALIDA IMO 9522128	115,812	2008	249 m	Doosan - 7S60MC-C MK7	4.3	C
953	MINERVA SOPHIA IMO 9382762	115,748	2009	249 m	MAN - 6S60MC-C	4.3	C
954	SEALEO IMO 9473066	107,505	2012	244 m	MAN - 6S60MC-C	4.3	C
955	SEA JAGUAR IMO 9482627	114,024	2011	250 m	HHI - 7S60MC-C7	4.4	C
956	PACIFIC A. DORODCHI IMO 9732266	109,999	2016	250 m	Hyundai - 6G60ME-C9	4.4	C
957	STI JERMYN IMO 9722596	109,999	2016	256 m	MAN - 6G60ME-C9	4.4	C
958	BLUE INTEGRITY IMO 9388778	108,926	2005	245 m	MAN - 6S60MC-C	4.4	C
959	BAHRA IMO 9595008	110,761	2012	250 m	MAN - 6S60ME-C	4.4	C
960	SILVER MILLIE IMO 9692363	49,642	2015	183 m	MAN - 6G50ME-B9	4.4	C
961	MINERVA NOUNOU IMO 9309423	114,850	2006	254 m	Wärtsilä - 6RT-flex68T-B	4.4	C
962	HELLAS CALAFIA IMO 9798088	49,810	2018	183 m	Hyundai - 6G50ME-B9	4.4	C
963	CLEAROCEAN MUSTANG IMO 9893761	49,999	2020	183 m	—	4.4	C
964	NORTH SEA IMO 9760495	106,340	2016	229 m	Mitsui - 6S60ME-C8	4.4	C
965	GULF CORAL IMO 9389851	74,999	2009	228 m	MAN - 6S60MC-C	4.4	C
966	DUBAI CHARM IMO 9402495	115,514	2010	250 m	MAN - 6S60MC-C	4.4	C
967	YASA GOLDEN BOSPHORUS IMO 9334038	115,867	2007	249 m	MAN - 6S60MC-C	4.4	C
968	STI ALEXIS IMO 9696694	109,999	2015	256 m	MAN - 6G60ME-C9	4.4	C
969	TORM THOR IMO 9712292	49,666	2015	183 m	MAN - 6G50ME-C9	4.4	C
970	MARI JONE IMO 9725316	49,999	2016	186 m	Hyundai - 6G50ME-B9.3-LGI (Tier-II)	4.4	C
971	ATHENS VOYAGER IMO 9337391	105,614	2007	238 m	Diesel United - 6RTA58T	4.4	C
972	SEASTAR IMO 9373656	116,049	2008	250 m	Doosan - 6S60MC-C	4.4	C
973	SEA JEWEL IMO 9607722	112,081	2013	250 m	HHI - 7S60MC-C8.1	4.4	C
974	CHIOS I IMO 9792187	156,984	2017	274 m	CSSC - 6G70ME-C9	4.4	C
975	GEM NO. 3 IMO 9774343	79,920	2014	219 m	Mitsui - 6S60ME-C8.5	4.4	C
976	ALYARMOUK IMO 9356438	116,038	2008	249 m	MAN - 6S60MC-C	4.4	C
977	SEA STAR IMO 9607710	112,147	2010	250 m	HHI - 7S60MC-C8.1	4.4	C
978	PINTAIL PACIFIC IMO 9983891	49,773	2024	183 m	MAN - 6G50ME-C9	4.5	C
979	LILLESAND IMO 9336397	105,786	2007	240 m	Mitsui - 6S60MC-C	4.5	C
980	SYNNØVE KNUTSEN IMO 9868388	152,868	2020	279 m	MAN - 6G70ME-C10	4.5	C
981	EAGLE PETROLINA IMO 9858553	153,226	2020	277 m	Hyundai - 5X72	4.5	C
982	NAVIG8 MACALLISTER IMO 9482873	75,618	2012	229 m	DALIAN MARINE - 6S60MC	4.5	C
983	MINERVA PISCES IMO 9410179	105,475	2008	244 m	HHI - 6S60MC-C	4.5	C
984	SEAPRINCESS IMO 9373668	115,948	2005	250 m	Doosan - DOOSAN-MAN B&W 6S60MC-C	4.5	C
985	SUNNY LIGER IMO 9332626	74,997	2008	228 m	MAN - 6S60MC-C	4.5	C
986	MINERVA ELPIDA IMO 9440526	112,793	2010	250 m	Doosan - 6S60MC-C	4.5	C
987	ALEXANDER IMO 9826720	113,170	2017	250 m	Hyundai - 7X62DF	4.5	C
988	KMARIN RESTRAINT IMO 9683075	109,526	2017	250 m	STX - 6G60ME-C9	4.5	C
989	DUGI OTOK IMO 9334727	108,414	2008	246 m	MAN - 6S60MC-C	4.5	C
990	EAGLE PARAISO IMO 9858577	153,264	2020	279 m	Wärtsilä - 5X72	4.5	C
991	ATROTOS IMO 9953432	50,113	2023	183 m	6G50ME-C9-HPSCR	4.5	D
992	HAFNIA EGRET IMO 9607174	49,999	2014	175 m	MAN - 6S50MC-C8	4.5	D
993	SEA HYMN IMO 9412036	116,337	2011	250 m	MAN - 6S60MC-C8	4.5	D
994	NAVIG8 MARTINEZ IMO 9482847	75,599	2011	229 m	DALIAN MARINE - 6S60MC	4.5	D
995	ALBERTA IMO 9486922	104,760	2010	229 m	Diesel United - 6S60MC-C	4.5	D
996	ALDER EXPRESS IMO 9934163	49,832	2020	183 m	6G50ME-C9-HPSCR	4.5	D
997	BOUVARDIA IMO 9935595	111,009	2022	250 m	6G60ME-C10-HPSCR	4.5	D
998	VALLESINA IMO 9417311	109,089	2009	243 m	Hudong Heavy Machinery - 7 S 60 MC	4.5	D
999	PRIMERO IMO 9741815	106,329	2016	229 m	Mitsui - 6S60MC-C8	4.5	D
1000	SEMERU IMO 9388376	105,777	2008	244 m	HHI - HYUNDAI MAN - B&W 6S60MC-C	4.5	D

Page 20 of 34 — 1,651 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 2025 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.