Most Emission-Efficient LNG 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 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2025)

#148 of 382 lng carriers

CO₂ intensity

5.5 g CO₂/dwt·nm

vs segment average (7.4)

-26% 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

390

vessels ranked

3.44

greenest (g CO₂/t·nm)

5.88

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
100	LNG ENTERPRISE IMO 9874480	88,744	2021	293 m	Wärtsilä - 5X72DF	5.2	B
102	HL SEA EAGLE IMO 9972373	89,033	2025	290 m	5G70ME-C10-GA-EGRBP	5.2	B
104	GASLOG WARSAW IMO 9816763	85,000	2016	297 m	Wärtsilä - 5X72DF	5.2	B
103	SK RESOLUTE IMO 9693173	94,665	2018	292 m	Doosan - 6X62DF	5.2	B
105	GASLOG WELLINGTON IMO 9876660	93,694	2018	297 m	Wärtsilä - 5X72DF	5.2	B
106	GLOBAL SEA SPIRIT IMO 9880465	93,080	2021	295 m	Hyundai - 5X72	5.2	B
107	LNGSHIPS EMPRESS IMO 9875800	94,000	2021	293 m	Wärtsilä - 5X72DF	5.2	B
108	CELSIUS GALWAY IMO 9958999	92,385	2025	299 m	MAN-B&W 5G70ME-C10-GA	5.2	B
110	MARVEL KITE IMO 9760782	94,400	2019	293 m	Wärtsilä - 6X62DF	5.2	B
109	NEW NATURE IMO 9926910	95,806	2024	299 m	Hyundai - 5X72DF	5.2	B
111	FLEX AURORA IMO 9857365	93,775	2020	297 m	Wärtsilä - 5X72DF	5.2	B
112	ID'ASAH IMO 9977220	88,053	2022	290 m	5G70ME-C10-GA-EGRBP	5.2	B
114	MARAN GAS PSARA IMO 9844863	94,732	2020	295 m	Doosan - 5G70ME-C9-GI	5.2	B
113	SEAPEAK YAMAL IMO 9781920	91,610	2019	294 m	MAN - 5G70ME-C9-GI	5.2	B
116	MYRINA IMO 9770933	95,378	2018	295 m	Doosan - 5G70ME-C9-GI	5.3	B
115	HLS BILBAO IMO 9941013	94,927	2024	295 m	MAN - 5G70ME-C10-GI	5.3	B
117	GASLOG WALES IMO 9853137	93,076	2018	297 m	Wärtsilä - 5X72DF	5.3	B
118	NOHSHU MARU IMO 9796781	97,902	2019	298 m	Mitsubishi - 1 x MR21-II, 3 x 6L50DF	5.3	B
119	GASLOG HONG KONG IMO 9748904	92,266	2018	290 m	Hyundai - 5X72DF	5.3	B
120	ENERGY INTEGRITY IMO 9859739	94,648	2021	295 m	Doosan - 5G70ME-C9-GI	5.3	B
121	GRACE EMILIA IMO 9884174	89,729	2021	297 m	Hyundai - 5X72DF	5.3	B
123	LNG MERAK IMO 9834301	91,451	2020	295 m	CSSC - 6X72DF	5.3	B
122	HELLAS DIANA IMO 9872987	93,098	2018	299 m	Wärtsilä - 5X72DF	5.3	B
125	LNG ABALAMABIE IMO 9690171	86,925	2016	292 m	Wärtsilä - 8L50DF	5.3	B
124	FLEX COURAGEOUS IMO 9825439	96,000	2019	295 m	Doosan - 5G70ME-C9-GI	5.3	B
126	AKTORAS IMO 9958286	93,533	2024	299 m	HD Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	5.3	B
127	FLEX CONSTELLATION IMO 9825427	95,452	2017	295 m	Doosan - 5G70ME-C9-GI	5.3	B
129	KUN LUN IMO 9915911	91,509	2023	295 m	Wärtsilä - 6X72DF	5.3	B
128	BW LILAC IMO 9758076	90,714	2018	295 m	Doosan - 5G70ME-C9-GI	5.3	B
131	ORION SAINT IMO 9958858	88,059	2025	290 m	MAN-B&W 5G70ME-C10-GA	5.3	B
130	BUSHU MARU IMO 9796793	97,955	2015	298 m	Mitsubishi - 1 x MR21-II 1xN3 HXC 1000 J8	5.3	B
132	VENTURE CREOLE IMO 9960590	94,069	2025	295 m	MAN - 5G70ME-C10-GI	5.4	B
133	MARVEL SWALLOW IMO 9963449	93,510	2024	295 m	5G70ME-C10-GA	5.4	B
136	RIAS BAIXAS KNUTSEN IMO 9825568	96,354	2019	299 m	Hyundai - 5G70ME-C9-GI	5.4	B
135	ENERGY ENDEAVOUR IMO 9854624	94,648	2021	295 m	Doosan - 5G70ME-C9-GI	5.4	B
134	GASLOG WINCHESTER IMO 9876737	93,678	2021	297 m	Wärtsilä - 6X62DF	5.4	B
138	DIAMOND GAS CRYSTAL IMO 9874454	89,846	2021	297 m	Wärtsilä - 5X72DF	5.4	B
137	ORION SIRIUS IMO 9956616	87,968	2025	290 m	MAN-B&W 5G70ME-C10-GA	5.4	B
140	ISABELLA IMO 9874820	93,080	2018	295 m	MAN - 5G70ME-C9-GI	5.4	B
139	UMM GRAYBAH IMO 9977232	88,038	2024	290 m	5G70ME-C10-GA-EGRBP	5.4	B
142	QOGIR IMO 9851787	94,000	2020	293 m	Wärtsilä - 5X72DF	5.4	B
141	BRITISH PARTNER IMO 9766530	94,442	2018	295 m	Doosan - 5G70ME-C9-GI	5.4	B
143	LESHATT IMO 9977268	88,000	2025	290 m	5G70ME-C10-GA-EGRBP	5.4	B
144	NUAIJAH IMO 9976903	94,325	2024	295 m	Hanwha Engine Co Ltd - South Korea 5G70ME-C10-GA-EGRBP	5.4	B
146	BW MAGNOLIA IMO 9850666	90,625	2020	295 m	Doosan - 5G70ME-C9-GI	5.4	B
145	GASLOG WINDSOR IMO 9819650	92,764	2020	297 m	Wärtsilä - 5X72DF	5.4	B
147	VIVIT AMERICAS LNG IMO 9864667	93,534	2020	299 m	Hyundai - 5X72DF	5.5	B
149	GASLOG GALVESTON IMO 9864928	88,136	2021	293 m	Wärtsilä - 5X72DF	5.5	B
148	MARAN GAS AMPHIPOLIS IMO 9701217	96,000	2013	295 m	Doosan - 5G70ME-C9-GI	5.5	B
150	GLOBAL SEALINE IMO 9880477	93,080	2022	295 m	HSD Engine Co Ltd - South Korea 5X72DF	5.5	B

Page 3 of 8 — 382 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.