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)

#108 of 1,651 oil tankers

CO₂ intensity

2.2 g CO₂/dwt·nm

vs segment average (5.18)

-57% 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
100	NAVE ALLEGRO IMO 9876414	313,433	2020	339 m	MAN - 7G80ME-C9	2.2	A
102	PROTEUS INGRID IMO 9923463	119,900	2023	250 m	Wärtsilä - 6X62DF	2.2	A
103	MAXIM IMO 9604079	296,887	2011	330 m	CSSC - 7S80MC	2.2	A
104	NISSOS HERACLEA IMO 9419618	313,875	2006	336 m	MAN - 6S90MC-C	2.2	A
106	IONIC SEMELI IMO 1037933	159,120	2025	274 m	MAN-B&W 7S60ME-C10	2.2	A
105	MARAN ARIADNE IMO 9770517	319,398	2016	336 m	Hyundai - 7G80ME-C9	2.2	A
107	EAGLE VALLERY IMO 9910246	299,473	2022	330 m	Doosan Engine Co. Ltd. 7X82DF	2.2	A
109	DHT EUROPE IMO 9315159	317,713	2007	333 m	MAN - 6S90MC-C	2.2	A
108	NORTH LOYALTY IMO 9537771	314,000	2012	332 m	STX - 6S90MC-C	2.2	A
110	ITHAKI IMO 9526461	299,940	2011	333 m	HHI - 6S90MC-C7	2.3	A
111	NEW ENERGY IMO 9708526	318,608	2016	333 m	Doosan - 7G80ME-C9	2.3	A
112	NEW MELODY IMO 9799185	307,430	2019	333 m	MAN - 7G80ME-C9	2.3	A
113	SONANGOL NJINGA MBANDE IMO 9938494	157,663	2023	274 m	Hyundai - 6G70ME-C9	2.3	A
116	NEW PEARL IMO 9468322	301,525	2011	333 m	Wärtsilä - 7RTA84T	2.3	A
115	IONIAN SAILOR IMO 9296389	149,997	2006	274 m	Diesel United - 6RTA72	2.3	A
114	TRINITY IMO 9730361	158,734	2016	274 m	Hyundai - 5G70ME-C9	2.3	A
118	NORDIC TELLUS IMO 9818230	157,407	2018	277 m	Doosan - 6X72	2.3	A
117	SONANGOL MAIOMBE IMO 9766322	156,935	2017	274 m	Doosan - 6G70ME-C9	2.3	A
119	IMOLA IMO 1014876	156,906	2025	270 m	MAN-B&W 6G70ME-C10	2.3	A
120	LAUSANNE STAR IMO 1028530	158,000	2025	274 m	MAN-B&W 6G70ME-C10	2.3	A
122	AZURE NOVA IMO 9602631	319,743	2012	333 m	Hyundai - 6S90ME-C	2.3	A
121	DELTA COMMANDER IMO 9418157	157,476	2010	274 m	MAN - 6S70MC-C	2.3	A
125	HARMONIC IMO 9819868	159,204	2015	274 m	Mitsui - 7S65ME-C8	2.3	A
124	EAGLE SAN FRANCISCO IMO 9795127	157,512	2018	277 m	Hyundai - 5X72	2.3	A
123	DELTA MARIA IMO 9700691	157,031	2015	274 m	MAN - 6G70ME-C9	2.3	A
127	BOLD WARRIOR IMO 1058092	156,885	2025	274 m	MAN-B&W 6G70ME-C10	2.4	A
126	MONTESPERANZA IMO 9585871	159,179	2012	274 m	Doosan - 6S70ME-C8	2.4	A
128	SEAWAYS MONTAUK IMO 9779537	158,432	2017	274 m	Hyundai - 6G70ME-C9	2.4	A
131	UNION PEACE IMO 9339973	311,141	2007	333 m	MAN - 7S80MC-C	2.4	A
130	SEA AMETHYST IMO 9920693	157,146	2020	277 m	MAN - 6G70ME-C10	2.4	A
129	MARLIN SOMERSET IMO 9835850	156,620	2017	274 m	CSSC - 6G70ME-C9	2.4	A
132	C. INNOVATOR IMO 9595618	313,999	2012	333 m	MAN - 7S80ME-C8	2.4	A
134	SEATRIUMPH IMO 9783722	299,700	2017	333 m	Hyundai - 7G80ME-C9	2.4	A
136	AESOP IMO 1030399	158,954	2025	274 m	MAN-B&W 7S60ME-C10	2.4	A
133	EAGLE SAN JOSE IMO 9795139	157,512	2018	277 m	Hyundai - 6X72	2.4	A
138	VL PRIME IMO 9683685	319,547	2015	333 m	Hyundai - 6G80ME-C9.2	2.4	A
137	BRUGGE IMO 9941855	157,138	2023	270 m	Hyundai Heavy Industries Co. Ltd. 6G70ME-C10-HPSCR	2.4	A
135	CEDAR IMO 9907433	158,289	2022	274 m	6G60ME-C10.5	2.4	A
139	TWIN POLLUX IMO 9625968	320,475	2010	332 m	Wärtsilä - 7RT-flex82T	2.4	A
141	YASA SOUTHERN CROSS IMO 9534030	318,438	2006	333 m	HHI - 7RT- FLEX 84T-D	2.4	A
140	ADVANTAGE SMART IMO 1028683	158,000	2025	274 m	—	2.4	A
142	GULF SUNRISE IMO 9788887	301,528	2017	336 m	Hyundai - 7G80ME-C9	2.4	A
143	SATURN MOON IMO 9814430	158,000	2020	274 m	CSSC - 6G70ME-C9	2.4	A
144	DIMITRIOS IMO 9900007	159,159	2021	274 m	MAN - 7S65ME-C8	2.4	A
145	PATRIOTIC IMO 9819832	159,090	2019	274 m	MAN - 7S65ME-C8.5	2.4	A
146	PASCHALIS DD IMO 9765378	159,812	2018	274 m	Hyundai - 6S70ME-C9	2.4	A
150	KIMOLOS IMO 9791145	159,159	2018	274 m	Mitsui - 7S65ME-C8.5	2.5	A
149	FRONT CLASSIC IMO 9759769	157,434	2017	276 m	CSSC - 6G70ME-C9	2.5	A
148	BUKHA IMO 9500936	319,439	2012	333 m	HHI - WARTSILA 7RT-FLEX82T	2.5	A
147	SEAWAYS TYBEE IMO 9734642	300,960	2015	333 m	MAN - 7G80ME-C9	2.5	A

Page 3 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.