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.

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
1	FLEX RANGER IMO 9709025	156,000	2018	293 m	MAN - 5G70ME-C9-GI	3.4	A
2	GREENERGY PEARL IMO 9961489	93,875	2025	299 m	CSSC-MES Diesel Co Ltd - China 5X72DF- iCER	3.9	A
3	CLEAN MISTRAL IMO 9967328	107,386	2025	300 m	Hyundai Heavy Industries Co Ltd - South Korea 6G70ME-C10-EGRBP	4.0	A
4	LECH KACZYNSKI IMO 9922976	95,428	2022	299 m	Wärtsilä - 5X72DF	4.0	A
5	MARAN GAS MARSEILLE IMO 9924869	89,300	2023	293 m	WinGD 5X72DF	4.1	A
6	ENERGY ENDURANCE IMO 9948695	95,165	2024	290 m	Wärtsilä - 5X72DF	4.1	A
7	CLEAN VITALITY IMO 9943499	107,621	2024	300 m	Hyundai - 5X72DF	4.1	A
8	MINERVA CHIOS IMO 9877341	88,228	2021	293 m	Wärtsilä - 5X72DF	4.1	A
9	FLEX RAINBOW IMO 9709037	156,000	2013	293 m	Doosan - 5G70ME-C9-GI	4.1	A
10	PRISM BRILLIANCE IMO 9810551	97,493	2019	299 m	Hyundai - 5X72DF	4.2	A
11	CELSIUS GENEVA IMO 9945435	92,385	2023	299 m	HSD Engine Co Ltd - South Korea 6X62DF	4.2	A
12	REX TILLERSON IMO 9953248	93,076	2024	299 m	6X72DF-LPSCR	4.2	A
14	PRISM AGILITY IMO 9810549	97,494	2019	299 m	Hyundai - 5X72DF	4.2	A
13	PUTERI SAADONG IMO 9937945	93,414	2024	290 m	Wärtsilä - 5X72DF	4.2	A
15	PUTERI LEDANG IMO 9947598	93,414	2024	290 m	Hyundai - 5X72DF	4.2	A
16	PRISM COURAGE IMO 9888481	97,494	2021	299 m	Hyundai - 5X72DF	4.2	A
17	ENERGY FIDELITY IMO 9540089	95,165	2023	290 m	HD Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	4.2	A
18	MARAN GAS NICE IMO 9941518	89,292	2024	293 m	WinGD 5X72DF	4.3	A
19	MARAN GAS ANTIBES IMO 9941520	89,469	2024	293 m	WinGD 5X72DF	4.3	A
20	LNG HARMONY IMO 9917555	95,655	2023	299 m	Wärtsilä - 5X72DF	4.3	A
21	NEW GREEN IMO 9947500	95,746	2024	299 m	Wärtsilä - 5X72DF	4.3	A
22	MARVEL DOVE IMO 9964182	94,539	2024	290 m	Hyundai Heavy Industries Co. Ltd. 6G70ME-C10	4.4	A
23	CELSIUS CHARLOTTE IMO 9878711	92,253	2021	299 m	Wärtsilä - 5X72DF	4.4	A
25	PRISM DIVERSITY IMO 9904651	97,494	2022	299 m	Hyundai - 5X72DF	4.5	A
24	CLEAN COPANO IMO 9886744	107,817	2022	300 m	Wärtsilä - 5X72DF	4.5	A
26	IGNACY LUKASIEWICZ IMO 9946398	95,440	2023	299 m	Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	4.5	A
27	VIVIRT CITY LNG IMO 9895238	92,855	2019	299 m	Wärtsilä - 5X72DF	4.5	A
28	COOL DISCOVERER IMO 9861031	93,667	2020	299 m	Hyundai - 5X72DF	4.5	A
29	MALAGA KNUTSEN IMO 9904182	95,548	2022	299 m	Wärtsilä - 5X72DF	4.5	A
30	CLEAN DESTINY IMO 9943487	107,637	2023	300 m	Hyundai Heavy Industries Co Ltd - South Korea 6G70ME-C10-GA-EGRBP	4.5	A
32	CLEAN FUTURE IMO 9943504	107,661	2024	300 m	Hyundai Heavy Industries Co. Ltd. 6G70ME-C10-GA-EGRBP	4.5	A
31	COOL RACER IMO 9869265	93,423	2021	299 m	Wärtsilä - 5X72DF	4.5	A
33	NANTES KNUTSEN IMO 9926714	95,548	2024	299 m	Wärtsilä - 5X72DF	4.5	A
34	ELISA ARDEA IMO 9980540	95,120	2024	297 m	5X72DF	4.5	A
35	YIANNIS IMO 9879674	92,619	2021	295 m	MAN - 5G70ME-C9-GI	4.6	A
36	LNG PROSPERITY IMO 9902938	95,630	2023	299 m	Hyundai - 5X72DF	4.6	A
38	LNGSHIPS ATHENA IMO 9872949	93,534	2021	299 m	Hyundai - 5X72DF	4.6	A
37	MESAIEED IMO 9975519	93,124	2025	299 m	Hyundai - 5X72DF	4.6	A
39	SANTANDER KNUTSEN IMO 9904170	95,548	2022	299 m	Wärtsilä - 5X72DF	4.6	A
40	CELSIUS CAROLINA IMO 9878723	92,310	2021	299 m	Wärtsilä - 5X72DF	4.6	A
41	HELLAS ATHINA IMO 9872999	92,955	2021	299 m	Wärtsilä - 6X72DF	4.6	A
42	BONITO LNG IMO 9845788	93,534	2017	299 m	Hyundai - 5X72DF	4.6	A
43	DORADO LNG IMO 9863182	94,000	2020	293 m	Wärtsilä - 5X72DF	4.6	A
45	VENTURE BAYOU IMO 9958846	88,001	2024	290 m	MAN-B&W 5G70ME-C10-GA	4.6	A
44	PEARL LNG IMO 9862346	94,000	2020	293 m	Wärtsilä - 5X72DF	4.6	A
46	KOOL TIGER IMO 9976135	92,924	2025	290 m	Hyundai Heavy Industries Co. Ltd. 5G70ME-C10-GA	4.7	A
47	LA SEINE IMO 9845764	93,534	2020	299 m	Hyundai - 5X72DF	4.7	A
49	CLEAN RESOLUTION IMO 9943475	107,573	2023	300 m	HD Hyundai Heavy Industries Co Ltd - South Korea 6G70ME-C10-GA-EGRBP	4.7	A
48	WOODSIDE CHANEY IMO 9753026	94,945	2019	295 m	Doosan - 7G70ME-C9-GI	4.7	A
50	MARAN GAS ANDROS IMO 9810379	94,638	2019	295 m	MAN - 5G70ME-C9-GI	4.7	A

Page 1 of 8 — 382 vessels

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.