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)

#74 of 382 lng carriers

CO₂ intensity

4.9 g CO₂/dwt·nm

vs segment average (7.4)

-34% 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
52	SAINT BARBARA IMO 9946386	95,440	2023	299 m	MAN-B&W 5G70ME-C10-GA	4.7	A
51	ALICANTE KNUTSEN IMO 9904194	95,548	2022	299 m	Wärtsilä - 5X72DF	4.7	A
53	CELSIUS GANDHINAGAR IMO 9946829	92,385	2024	299 m	HSD Engine Co Ltd - South Korea 5G70ME-C10-GA	4.7	A
54	CELSIUS GIZA IMO 9945447	92,385	2023	299 m	HSD Engine Co Ltd - South Korea 6X62DF	4.7	A
55	ADRIANO KNUTSEN IMO 9831220	96,354	2019	299 m	Hyundai - 5G70ME-C9-GI	4.8	A
56	ORION GAUGUIN IMO 9947639	95,578	2025	299 m	5X72DF	4.8	A
57	CLEAN LEVANT IMO 9967330	92,994	2025	300 m	HD Hyundai Heavy Industries Co Ltd - South Korea 6G70ME-C10-EGRBP	4.8	A
58	CELSIUS COPENHAGEN IMO 9864784	92,473	2020	299 m	Wärtsilä - 5X72DF	4.8	A
60	MINERVA PSARA IMO 9854363	96,000	2021	295 m	MAN - 5G70ME-C9-GI	4.8	A
59	GASLOG ITALY IMO 9962407	93,570	2021	295 m	MAN - 5G70ME-C10-GI	4.8	A
63	ATHOS LNG IMO 9972672	88,808	2024	290 m	5G70ME-C10-GA-EGRBP	4.8	A
62	SM KESTREL IMO 9917579	95,817	2023	299 m	Wärtsilä - 5X72DF	4.8	A
61	HL FORTUNA IMO 9986283	92,855	2025	299 m	HD Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	4.8	A
64	BU FINTAS IMO 9976824	88,876	2024	290 m	UnKnown 5G70ME-C10-GA-EGRBP	4.8	A
67	ELISA AQUILA IMO 9884473	95,132	2022	297 m	Wärtsilä - 5X72DF	4.8	A
66	CELSIUS GRANADA IMO 9948736	92,385	2024	299 m	Wärtsilä - 5X72DF	4.8	A
65	CLEAN CAJUN IMO 9886732	107,662	2022	300 m	Wärtsilä - 5X72DF	4.8	A
68	MARAN GAS SPETSES IMO 9767950	96,000	2018	295 m	Doosan - 5G70ME-C9-GI	4.8	A
69	MARAN GAS HYDRA IMO 9767962	94,945	2019	295 m	Doosan - 5G70ME-C9-GI	4.8	A
70	GASLOG GLADSTONE IMO 9744025	94,400	2019	293 m	Doosan - 5X72DF	4.9	A
71	COBIA LNG IMO 9869306	93,534	2021	299 m	Hyundai - 5X72DF	4.9	A
72	MARVEL PHOENIX IMO 9962419	93,416	2024	295 m	MAN - 5G70ME-C10-GI	4.9	A
73	AL KHARRARAH IMO 9976939	94,326	2025	295 m	UnKnown 5G70ME-C10-GA-EGRBP	4.9	A
75	UMM GHUWAILINA IMO 9953250	93,058	2024	299 m	6X72DF-LPSCR	4.9	A
74	VENTURE PELICAN IMO 9970569	107,840	2025	298 m	—	4.9	A
76	NEW APEX IMO 9929106	88,874	2023	293 m	Wärtsilä - 5X72DF	4.9	A
78	CELSIUS CANBERRA IMO 9864796	92,454	2021	299 m	Wärtsilä - 5X72DF	4.9	A
77	SERI DAYA IMO 9896452	87,781	2023	293 m	Hyundai - 5X72DF	4.9	A
79	MARAN GAS EFESSOS IMO 9627497	89,711	2014	294 m	Wartsila 9L50DF	4.9	A
80	GORDON WATERS KNUTSEN IMO 9946374	95,501	2023	299 m	Hyundai Heavy Industries Co Ltd - South Korea 5G70ME-C10-GA	4.9	B
82	FLEX VIGILANT IMO 9862475	93,764	2021	297 m	Hyundai - 5X72DF	5.0	B
81	ENERGY PACIFIC IMO 9854612	94,649	2020	295 m	Doosan - 5G70ME-C9-GI	5.0	B
83	AXIOS II IMO 9943853	93,736	2021	299 m	HD Hyundai Heavy Industries Co Ltd - South Korea 2 x 5X72DF-HPSCR	5.0	B
85	EXTREMADURA KNUTSEN IMO 9918157	95,548	2023	299 m	Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	5.0	B
84	VENTURE ACADIA IMO 9960588	94,175	2025	295 m	MAN - 5G70ME-C10-GI	5.0	B
86	LNG SCHNEEWEISSCHEN IMO 9771913	98,747	2018	298 m	MAN - 5G70ME-C9-GI	5.0	B
87	SEAPEAK GLASGOW IMO 9781918	91,546	2018	294 m	Hyundai - 5G70ME-C9-GI	5.0	B
88	MARAN GAS AMORGOS IMO 9887217	92,619	2019	295 m	MAN - 5G70ME-C9-GI	5.0	B
89	VIVIT ARABIA LNG IMO 9902756	92,855	2022	299 m	Wärtsilä - 5X72DF	5.0	B
90	MARAN GAS ULYSSES IMO 9709491	92,621	2017	290 m	Wärtsilä - 2x12V50DF, 2x12V50DF	5.1	B
93	GRAZYNA GESICKA IMO 9922988	95,428	2023	299 m	Wärtsilä - 5X72DF	5.1	B
92	AMBERJACK LNG IMO 9845776	93,534	2020	299 m	Hyundai - 5X72DF	5.1	B
91	MARAN GAS KALYMNOS IMO 9883742	93,080	2021	295 m	MAN - 5G70ME-C9-GI	5.1	B
94	ORION JESSICA IMO 9917543	95,400	2023	299 m	Wärtsilä - 5X72DF	5.1	B
95	MARAN GAS TROY IMO 9658240	89,240	2015	294 m	Wärtsilä - 9L50DF	5.1	B
97	GLOBAL ENERGY IMO 9845013	94,732	2017	295 m	Doosan - 5G70ME-C9-GI	5.2	B
96	TENERGY IMO 9892456	93,649	2022	299 m	Hyundai - 5X72DF	5.2	B
98	MARAN GAS ROXANA IMO 9701229	96,000	2017	295 m	Doosan - 5G70ME-C9-GI	5.2	B
100	LNG ENTERPRISE IMO 9874480	88,744	2021	293 m	Wärtsilä - 5X72DF	5.2	B
99	HL ALYSSA WARNER IMO 9972359	89,033	2025	290 m	UnKnown 5G70ME-C10-GA-EGRBP	5.2	B

Page 2 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.