Most Emission-Efficient Gas Carriers

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)

#193 of 316 gas carriers

CO₂ intensity

13.2 g CO₂/dwt·nm

vs segment average (13.55)

-3% 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

323

vessels ranked

4.53

greenest (g CO₂/t·nm)

11.21

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
151	NAVIGATOR LEO IMO 9482574	22,844	2011	160 m	MAN - 8S60ME-C	10.5	C
152	LALLA FATMA N'SOUMER IMO 9275347	80,920	2004	290 m	Kawasaki - UA-400	10.5	C
153	ENRICO FERMI IMO 9789312	28,532	2018	180 m	6G50ME-C9	10.5	C
154	BERTOLLE IMO 9177545	23,495	2000	170 m	Sulzer - 6RTA52U	10.6	C
155	ARRHENIUS IMO 9471032	26,645	2010	174 m	Hyundai - 8S60ME-C	10.8	C
156	CHESHIRE IMO 9369772	26,471	2008	174 m	Hyundai - 7S50MC	10.8	C
157	GAS VENUS IMO 9774197	28,702	2017	180 m	Hyundai - 6G50ME-C9	10.8	C
158	SYLVIE IMO 9332066	26,348	2007	174 m	MAN - 7S50MC	10.9	C
159	GASCHEM DOLLART IMO 9744776	23,663	2020	160 m	MAN - 5G45ME-C9	10.9	C
160	TRAMMO CORNELL IMO 9543081	28,202	2017	182 m	STX - 6G50ME-B9	10.9	C
161	INEOS INNOVATION IMO 9744958	20,917	2016	180 m	Wärtsilä - 6L50DF	11.2	C
162	ALKAID IMO 9655509	22,780	2013	160 m	MAN - 6S46MC-C	11.2	C
163	ANTWERPEN IMO 9318321	26,361	2005	174 m	Hyundai - 7S50MC	11.3	C
164	NAVIGATOR AURORA IMO 9726322	27,037	2016	180 m	Hyundai - 6S50ME-C8.2-GI	11.3	C
165	INEOS INVENTION IMO 9771511	20,738	2017	180 m	Wärtsilä - 6L50DF	11.4	C
166	PASCO ODIN IMO 9292101	29,216	2005	180 m	MAN - 6S50MC-C	11.4	C
167	NAVIGATOR SOLAR IMO 9712565	18,552	2018	156 m	STX - 5G45ME-C9	11.5	C
168	OCEANIC STAR IMO 9447794	26,416	2009	174 m	Hyundai - 6S50MC-C	11.5	C
169	NAVIGATOR CAPRICORN IMO 9403774	23,328	2008	160 m	Hyundai - 6S46MC-C	11.6	C
170	MANTA DICLE IMO 9666675	28,210	2013	183 m	HHI - 6S50ME-C8.2	11.9	C
171	ALCOR IMO 9655511	22,765	2013	160 m	MAN - 6S46MC-C8	12.0	C
172	DESERT ORCHID IMO 9798167	16,596	2018	160 m	Hudong Heavy Machinery - 6S50ME-C	12.1	C
173	NAVIGATOR VENUS IMO 9177557	23,503	2000	170 m	Sulzer - 6RTA52	12.1	C
174	RHOURD EL HAMRA IMO 9337793	19,277	2008	156 m	MAN - 6S50MC	12.2	C
175	CLIPPER EIRENE IMO 9834715	18,063	2019	160 m	Hyundai - 6S50ME-C8	12.2	C
176	DANCING BRAVE IMO 9798179	16,600	2018	160 m	Hudong Heavy Machinery - 6S60ME-C8	12.2	C
177	INEOS INTREPID IMO 9685449	20,917	2015	180 m	Wärtsilä - 6L50DF	12.2	C
178	NAVIGATOR GUSTO IMO 9531507	16,687	2008	154 m	Hyundai - 6S50MC-C	12.2	C
179	INEOS INGENUITY IMO 9685437	20,897	2015	180 m	Wärtsilä - 6L50DF	12.2	C
180	ENABLE IMO 9900851	16,930	2023	160 m	Hyundai - 6S50ME-C8	12.2	C
181	NAVIGATOR GALAXY IMO 9536363	16,686	2011	154 m	Hyundai - 6S50MC-C	12.4	C
182	INEOS INSIGHT IMO 9685425	20,918	2015	180 m	Wärtsilä - 6L50DF	12.4	C
183	INEOS INSPIRATION IMO 9685451	20,916	2016	178 m	Wärtsilä - 6G50ME-B9	12.4	C
184	INEOS INDEPENDENCE IMO 9744960	20,918	2017	180 m	Wärtsilä - 6L50DF	12.5	C
185	INEOS INTUITION IMO 9771523	20,716	2017	180 m	Wärtsilä - 6L50DF	12.7	C
186	THERESA SCHULTE IMO 9553622	14,999	2014	143 m	MAN - 6S42MC	12.7	C
187	CLIPPER EOS IMO 9827205	18,056	2019	160 m	Hyundai - 6S50ME-C8	12.8	C
188	YARA SELA IMO 9734850	18,547	2016	160 m	Hyundai - 6S50ME-C8.2 (Tier II)	12.8	C
189	EMPERY IMO 9744910	16,925	2016	160 m	MAN - 6S50ME-C8.2 (Tier II)	12.9	C
190	YARA KARA IMO 9734836	18,208	2016	160 m	Hyundai - 6S50ME-C8.2 (Tier II)	13.1	D
191	THEKLA SCHULTE IMO 9551777	14,999	2014	143 m	MAN - 6S42MC	13.1	D
192	CLIPPER ENYO IMO 9827217	18,077	2019	160 m	Hyundai - 6S50ME-C8	13.2	D
193	ZITA SCHULTE IMO 9694385	14,999	2017	146 m	STX - 6S40ME-B	13.2	D
194	YARA NAUMA IMO 9734848	18,208	2016	160 m	Hyundai - 6S50ME-C8.2 (Tier II)	13.2	D
195	CLIPPER ERIS IMO 9834727	18,044	2019	160 m	Hyundai - 6S50ME-C8	13.2	D
196	DILOS IMO 9711535	14,999	2016	147 m	Hyundai - 6S46ME-B8.3 (Tier II)	13.2	D
197	KITHNOS IMO 9711523	14,999	2016	147 m	Hyundai - 6S46ME-B8.3 (Tier II)	13.2	D
198	BERGA II IMO 9537032	26,375	2010	174 m	Hyundai - 7S50MC	13.3	D
199	NAVIGATOR GENESIS IMO 9531519	16,686	2011	154 m	Hyundai - 6S50MC-C	13.6	D
200	ELECTRA IMO 9897107	16,893	2022	160 m	MAN - 6S50ME-C8	13.7	D

Page 4 of 7 — 316 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.