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)

#1,140 of 1,651 oil tankers

CO₂ intensity

5.2 g CO₂/dwt·nm

vs segment average (5.18)

+1% higher

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
1101	JESSIE GLORY IMO 9952983	49,801	2021	183 m	MAN - 6G50ME-C9	5.0	D
1102	ECLIPSE I IMO 9301536	158,933	2006	274 m	MAN - 6S70MC-C	5.0	D
1103	ALORA IMO 9374856	73,604	2007	229 m	Hudong Heavy Machinery - 5S60MC-C	5.0	D
1104	MATILDA IMO 9407457	112,935	2009	250 m	HHI - 7S60MC-C7	5.0	D
1105	ALATAU IMO 9416551	115,896	2009	250 m	Doosan - 6S60MC-C	5.0	D
1106	MERONAS IMO 9934905	49,990	2022	183 m	Hyundai - 6G50ME-C9	5.1	D
1107	KALAHARI IMO 9410882	112,827	2009	250 m	Doosan - 7S60MC-C MK7	5.1	D
1108	STI MYTHIC IMO 9833553	47,499	2017	183 m	Hyundai - 6G50ME-C9	5.1	D
1109	IRINI IMO 9934890	49,990	2022	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9-HPSCR	5.1	D
1110	PS AMALFI IMO 9439395	99,987	2010	243 m	Hudong Heavy Machinery - 7 S 60 MC	5.1	D
1111	STAVANGER PRIDE IMO 9856062	49,999	2020	183 m	Hyundai - 6G50ME-C9	5.1	D
1112	NAVIG8 MESSI IMO 9482859	75,618	2011	229 m	DALIAN MARINE - 6S60MC	5.1	D
1113	SEA EAGLE IMO 9849045	49,916	2019	183 m	STX - 6G50ME-B9	5.1	D
1114	HAFNIA JAGUAR IMO 9635858	49,999	2014	183 m	MAN - 6S50MC-C8	5.1	D
1115	EMERALD EXPRESS IMO 9425564	50,110	2011	182 m	Mitsui - 6S50MC-C-MKVII	5.1	D
1116	PUFFIN PACIFIC IMO 9876402	49,903	2020	183 m	MAN - 6G50ME-C9	5.1	D
1117	NOSTOS IMO 9258014	47,147	2003	182 m	MAN - 6S50MC-MKVI	5.1	D
1118	HAFNIA EXCEL IMO 9735579	74,547	2015	219 m	MAN - 6S60ME-C8	5.1	D
1119	CEDAR EXPRESS IMO 9447770	51,495	2013	183 m	MAN - 6S50ME-B9	5.1	D
1120	VS PROGRESS IMO 9351426	73,727	2006	229 m	Hudong Heavy Machinery - 5S60MC-C	5.1	D
1121	S FONTVIEILLE IMO 9645786	49,990	2013	183 m	HHI - 6S50ME-B9.2	5.1	D
1122	HAFNIA PROVIDENCE IMO 9737759	74,997	2016	220 m	Hyundai - 6S60ME-C8	5.1	D
1123	MARINA M IMO 9952610	49,841	2021	183 m	STX - 6G50ME-C9	5.1	D
1124	EAGLE HAMILTON IMO 9426207	114,022	2010	250 m	Hyundai - 7 S 60 MC	5.1	D
1125	NAVIG8 HONOR IMO 9556181	75,000	2011	228 m	HHI - 6S60MC6	5.2	D
1126	MAERSK TEESPORT IMO 9726463	49,990	2016	183 m	MAN - 6G50ME-B9	5.2	D
1127	GISELE IMO 9321196	74,998	2007	228 m	Mitsui - 6S60MC	5.2	D
1128	HAFNIA PANTHER IMO 9694464	49,999	2014	183 m	MAN - 6S50MC-C8	5.2	D
1129	P. ALIKI IMO 9460136	105,304	2010	244 m	Hyundai - 6S90MC-C	5.2	D
1130	LEO SUN IMO 9457608	114,531	2011	244 m	Mitsui - 6S60MC-C	5.2	D
1131	CASTRO ALVES IMO 9547673	115,727	2018	249 m	Doosan - 6S60ME-C	5.2	D
1132	SEA COUGAR IMO 9834868	49,910	2019	183 m	STX - 6G50ME-B9	5.2	D
1133	SANDPIPER PACIFIC IMO 9648192	51,833	2013	183 m	MAN - 6S50ME-B9	5.2	D
1134	ST. MARY IMO 9439797	50,215	2009	183 m	MAN - 6S50MC-C	5.2	D
1135	WONDER ALTAIR IMO 9884825	50,302	2021	183 m	MAN - 6G50ME-C9	5.2	D
1136	EAGLE BLANE IMO 9833101	128,427	2020	277 m	Wärtsilä - 7X52	5.2	D
1137	CMC ANCUD IMO 9681106	49,990	2014	183 m	HHI - 6S50ME-B9.2	5.2	D
1138	MINERVA EMILY IMO 9380063	47,408	2009	182 m	Mitsui - 6S50MC	5.2	D
1139	KRITI STATE IMO 9324289	76,565	2006	229 m	DALIAN MARINE - 6S60MC	5.2	D
1140	MONTE ROSA IMO 9301952	74,932	2006	228 m	STX - STX-MAN B&W 6S60MC-C	5.2	D
1141	STI DUCHESSA IMO 9669938	49,990	2012	183 m	HHI - 6G50ME-B9.3	5.3	D
1142	ULYSSES I IMO 9426283	53,520	2010	186 m	MAN - 6S50MC-C	5.3	D
1143	VS PROSPERA IMO 9298313	73,869	2005	229 m	Hudong Heavy Machinery - 5S60MC-C	5.3	D
1144	ADVANTAGE PADOVA IMO 9794848	74,000	2019	228 m	MAN - 6S60ME-C8	5.3	D
1145	SEAWAYS MYSTERY IMO 9392808	49,999	2006	183 m	MAN - 6S50MC-C	5.3	D
1146	ADVANTAGE ATOM IMO 9472622	116,014	2011	249 m	MAN - 6S60MC-C	5.3	D
1147	VALPIAVE IMO 9453030	115,909	2010	249 m	Doosan - 6S60MC-C	5.3	D
1148	HAFNIA OSPREY IMO 9682241	49,999	2015	183 m	MAN - 6S50MC-C8	5.3	D
1149	STI DAMA IMO 9686716	49,990	2014	183 m	MAN - 6S50MC-C8	5.3	D
1150	SEAWAYS LONSDALE IMO 9697612	49,990	2014	183 m	MAN - 6S50MC-C8	5.3	D

Page 23 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.