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 2024. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2024)

#142 of 317 lng carriers

CO₂ intensity

6.1 g CO₂/dwt·nm

vs segment average (8.11)

-25% 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

324

vessels ranked

0.87

greenest (g CO₂/t·nm)

6.59

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
101	TRAIANO KNUTSEN IMO 9854765	96,354	2020	299 m	Hyundai - 5G70ME-C9-GI	5.5	B
103	BW PAVILION ARANTHERA IMO 9850678	90,400	2020	295 m	Doosan - 5G70ME-C9-GI	5.5	B
102	HELLAS ATHINA IMO 9872999	92,955	2021	299 m	Wärtsilä - 6X72DF	5.5	B
104	GAIL URJA IMO 9949027	93,758	2023	295 m	MAN - 5G70ME-C10-GI	5.5	B
106	SERI DAYA IMO 9896452	87,781	2023	293 m	Hyundai - 5X72DF	5.5	B
105	HELLAS DIANA IMO 9872987	93,098	2018	299 m	Wärtsilä - 5X72DF	5.5	B
107	GASLOG GIBRALTAR IMO 9707510	94,000	2013	291 m	Wärtsilä - 2x12V50DF / 2x8L50DF	5.5	B
109	IGNACY LUKASIEWICZ IMO 9946398	95,440	2023	299 m	Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	5.6	B
108	SEAPEAK BAHRAIN IMO 9771080	95,289	2018	295 m	MAN - 5G70ME-C9-GI	5.6	B
110	AMBERJACK LNG IMO 9845776	93,534	2020	299 m	Hyundai - 5X72DF	5.7	B
111	LNG BONNY II IMO 9692002	98,954	2015	300 m	Wärtsilä - 8L50DF	5.7	B
112	GAIL BHUWAN IMO 9877145	98,882	2021	298 m	Wärtsilä - 5X72DF	5.7	B
113	LNG ABALAMABIE IMO 9690171	86,925	2016	292 m	Wärtsilä - 8L50DF	5.7	B
114	PAN ASIA IMO 9750220	88,613	2017	290 m	MAN - 2x8L51/60DF, 2x12V51/60DF	5.8	B
115	LNG PHECDA IMO 9834313	91,712	2020	295 m	CSSC - 6X72DF	5.8	B
116	MARVEL FALCON IMO 9760768	85,000	2018	293 m	Doosan - 6X62DF	5.8	B
118	BW MAGNOLIA IMO 9850666	90,625	2020	295 m	Doosan - 5G70ME-C9-GI	5.8	B
117	NORTH WAY IMO 9953535	82,000	2024	293 m	—	5.8	B
119	ENERGY ENDEAVOUR IMO 9854624	94,648	2021	295 m	Doosan - 5G70ME-C9-GI	5.8	B
120	FLEX AURORA IMO 9857365	93,775	2020	297 m	Wärtsilä - 5X72DF	5.8	B
121	GRAZYNA GESICKA IMO 9922988	95,428	2023	299 m	Wärtsilä - 5X72DF	5.8	B
122	SEAPEAK OAK IMO 9681699	95,412	2016	295 m	MAN - 5G70ME-C9-GI	5.9	B
123	WUDANG IMO 9915909	91,466	2022	295 m	Wärtsilä - 6X72DF	5.9	B
124	BW PAVILION ARANDA IMO 9792606	90,381	2019	295 m	Doosan - 5G70ME-C9-GI	5.9	B
125	PAN AFRICA IMO 9750256	88,613	2019	290 m	MAN - 2x12V51/60DF, 2x8L51/60DF	5.9	B
126	LNG ABUJA II IMO 9690169	87,147	2016	292 m	Wärtsilä - 8L50DF	5.9	B
127	CELSIUS COPENHAGEN IMO 9864784	92,473	2020	299 m	Wärtsilä - 5X72DF	5.9	B
128	KOOL ORCA IMO 9870525	92,969	2021	299 m	Hyundai - 5X72DF	5.9	C
129	BW LESMES IMO 9873840	88,907	2021	295 m	Doosan - 5G70ME-C9-GI	5.9	C
131	RIAS BAIXAS KNUTSEN IMO 9825568	96,354	2019	299 m	Hyundai - 5G70ME-C9-GI	6.0	C
130	CELSIUS GENEVA IMO 9945435	92,385	2023	299 m	HSD Engine Co Ltd - South Korea 6X62DF	6.0	C
132	WEN CHENG IMO 9892121	91,218	2023	295 m	Wärtsilä - 6X72DF	6.0	C
133	MARVEL EAGLE IMO 9759240	83,571	2018	300 m	Wartsila-Hyundai Engine Co. Ltd. 9L50DF	6.0	C
134	EMEI IMO 9958640	91,557	2023	295 m	CSSC - 6X72DF	6.0	C
135	NEW NATURE IMO 9926910	95,806	2024	299 m	Hyundai - 5X72DF	6.0	C
136	GASLOG GEORGETOWN IMO 9864916	88,183	2020	293 m	Wärtsilä - 5X72DF	6.0	C
138	PAN AMERICAS IMO 9750232	88,425	2018	290 m	MAN - 2x8L51/60DF, 2x12V51/60DF	6.0	C
137	NORTH SKY IMO 9953523	88,809	2024	293 m	WinGD 5X72DF	6.0	C
139	BRITISH LISTENER IMO 9766566	94,494	2019	295 m	MAN - 5G70ME-C9-GI	6.0	C
140	NEW APEX IMO 9929106	88,874	2023	293 m	Wärtsilä - 5X72DF	6.1	C
141	MARIA ENERGY IMO 9659725	93,301	2016	290 m	Wärtsilä - 2x8L50DF / 2x12V50DF	6.1	C
142	LNG LAGOS II IMO 9692014	99,025	2016	300 m	Wärtsilä - 8L50DF	6.1	C
143	LNG DUBHE IMO 9834296	91,587	2019	295 m	CSSC - 6X72DF	6.1	C
145	PACIFIC SUCCESS IMO 9903425	88,624	2027	293 m	Wartsila 5X72DF	6.1	C
144	MUREX IMO 9705641	95,235	2017	295 m	Doosan - 5G70ME-C9-GI	6.1	C
146	CASTILLO DE SANTISTEBAN IMO 9433717	93,796	2010	300 m	ABB - 8L51/60DF	6.2	C
147	LNG PORT HARCOURT II IMO 9690157	87,139	2015	292 m	Wärtsilä - 8L50DF	6.2	C
149	CELSIUS GRANADA IMO 9948736	92,385	2024	299 m	Wärtsilä - 5X72DF	6.2	C
148	SHINSHU MARU IMO 9791200	82,287	2019	300 m	Wärtsilä - 8L50DF	6.2	C
150	LNG MERAK IMO 9834301	91,451	2020	295 m	CSSC - 6X72DF	6.2	C

Page 3 of 7 — 317 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.