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)

#165 of 1,789 oil tankers

CO₂ intensity

2.4 g CO₂/dwt·nm

vs segment average (5.1)

-54% 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
152	BLUE NOVA IMO 9534846	298,000	2011	330 m	Doosan - 7S80MC	2.3	A
154	FRONT CORAL IMO 9743203	157,522	2017	276 m	CSSC - 6G70ME-C9	2.3	A
151	ADVANTAGE VERITY IMO 9762998	299,998	2014	336 m	Hyundai - 7G80ME-C9	2.3	A
153	COSTAS P IMO 9934321	157,010	2023	277 m	MAN - 6G70ME-C10	2.3	A
155	CAP LARA IMO 9330874	158,826	2007	274 m	MAN - 6S70ME-C	2.3	A
157	GULF LOYALTY IMO 9441245	316,373	2011	333 m	Wärtsilä - 7RT-flex82T	2.3	A
156	MARAN ANTARES IMO 9581203	317,052	2012	333 m	HHI - 6S90ME-C8.2	2.3	A
158	BASRA IMO 9876438	312,965	2018	339 m	Mitsui - 7G80ME-C9	2.3	A
159	AQUAHONOR IMO 9925136	157,746	2022	274 m	MAN - 6G70ME-C10	2.3	A
160	RHYTHMIC IMO 9819856	159,196	2019	274 m	MAN - 7S65ME-C8	2.3	A
161	MARAN THALEIA IMO 9527295	321,225	2011	333 m	Hyundai - 7S80MC-C	2.3	A
162	ATLANTIC IMO 9912139	158,337	2022	274 m	MAN - 6G70ME-C10	2.4	A
164	HABRUT IMO 9500730	319,439	2012	333 m	HHI - HYUNDAI-WARTSILA 7RT-FLEX82T	2.4	A
163	HOMERIC IMO 9819844	157,000	2019	274 m	Mitsui - 7S65ME-C8	2.4	A
165	SONANGOL MAIOMBE IMO 9766322	156,935	2017	274 m	Doosan - 6G70ME-C9	2.4	A
167	MARAN ARIES IMO 9295000	320,870	2006	333 m	Hyundai - 6S90ME-C	2.4	A
166	C. SPIRIT IMO 9643269	313,998	2013	333 m	HHI - 7RT-FLEX82T	2.4	A
169	MARAN THETIS IMO 9421427	320,105	2012	333 m	MAN - 6S90MC-C	2.4	A
168	CASCADE SPIRIT IMO 9399492	156,852	2009	274 m	Hyundai - HYUNDAI MAN B&AMP;W 6S70MC-C	2.4	A
174	NORDIC TELLUS IMO 9818230	157,407	2018	277 m	Doosan - 6X72	2.4	A
173	SEA CORAL IMO 9920708	157,104	2020	277 m	6X72	2.4	A
172	CARIBBEAN GLORY IMO 9788875	301,528	2017	336 m	Hyundai - 7G80ME-C9	2.4	A
171	OCEANIS IMO 9532757	320,780	2011	331 m	Samsung Heavy Industries 7S80MC-C	2.4	A
170	MARAN LYRA IMO 9559406	317,924	2010	333 m	CSSC - 6S90MC-C	2.4	A
177	NEW SUCCESS IMO 9434632	296,713	2010	330 m	Doosan - 7RTA84T	2.4	A
176	NORDIC AQUARIUS IMO 9818216	157,338	2018	277 m	Wärtsilä - 6X72	2.4	A
178	ANTARCTICA IMO 9910492	163,128	2022	274 m	Hudong Heavy Machinery Co. Ltd. 6G70ME-C10-HPSCR	2.4	A
175	PATRIOTIC IMO 9819832	159,090	2019	274 m	MAN - 7S65ME-C8.5	2.4	A
180	MINERVA EVROPI IMO 9785237	159,000	2015	274 m	Hyundai - 5X72	2.4	A
179	POLIEGOS IMO 9746621	157,540	2017	277 m	Hyundai - 6X72	2.4	A
181	KIMOLOS IMO 9791145	159,159	2018	274 m	Mitsui - 7S65ME-C8.5	2.4	A
182	GREAT LADY IMO 9286138	308,930	2005	333 m	MAN - 7S80MC-C	2.4	A
183	FRONT CLIPPER IMO 9759771	157,351	2017	276 m	CSSC - 6G70ME-C9	2.4	A
184	MARAN ASPASIA IMO 9879997	157,946	2019	274 m	MAN - 6G70ME-C9	2.4	A
186	DELTA SUPREME IMO 9585895	159,031	2012	274 m	Doosan - 6S70ME-C8	2.4	A
185	STARWAY IMO 9900801	157,551	2022	274 m	CSSC-MES Diesel Co. Ltd. 6G70ME-C10.5	2.4	A
188	ATLANTIC M IMO 9907237	156,668	2022	274 m	MAN - 6G70ME-C10	2.4	A
187	FRONT CLASSIC IMO 9759769	157,434	2017	276 m	CSSC - 6G70ME-C9	2.4	A
189	LORD BYRON 21 IMO 9889954	156,921	2021	277 m	MAN - 6G70ME-C10	2.4	A
190	POPI P IMO 9934319	157,010	2023	277 m	MAN - 6G70ME-C10	2.4	A
193	RELIABLE WARRIOR IMO 9753557	159,058	2014	274 m	Hyundai - 6G70ME-C9	2.4	A
192	YASA SOUTHERN CROSS IMO 9534030	318,438	2006	333 m	HHI - 7RT- FLEX 84T-D	2.4	A
191	NORDIC CYGNUS IMO 9818228	157,526	2018	277 m	Doosan - 6X72	2.4	A
194	UNIVERSAL FRONTIER IMO 9829382	299,546	2019	330 m	Hyundai - 7G80ME-C9	2.5	A
196	AEGEAN MARATHON IMO 9745225	158,913	2016	274 m	MAN - 6G70ME-C9	2.5	A
195	MARIA IMO 9530890	157,523	2012	274 m	MAN - 6S70MC-C	2.5	A
199	BARAKAH IMO 9902615	307,925	2021	332 m	MAN - 7G80ME-C9	2.5	A
198	ZEUS IMO 9886378	159,153	2021	274 m	MAN - 7S65ME-C8	2.5	A
197	MARLIN SARDINIA IMO 9835862	156,606	2019	274 m	CSSC - 6G70ME-C9.5	2.5	A
200	MARFA IMO 9773478	159,512	2017	274 m	Hyundai - 6G70ME-C9	2.5	A

Page 4 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.