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)

#45 of 317 lng carriers

CO₂ intensity

4.9 g CO₂/dwt·nm

vs segment average (8.11)

-40% 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
1	CLEAN VISION IMO 9655456	89,863	2016	289 m	Wärtsilä - 2x12V50DF / 2x6L50DF	0.9	A
2	CLEAN COPANO IMO 9886744	107,817	2022	300 m	Wärtsilä - 5X72DF	3.6	A
3	ENERGY FORTITUDE IMO 9948700	95,165	2024	290 m	Wärtsilä - 5X72DF	3.8	A
4	PUTERI SAADONG IMO 9937945	93,414	2024	290 m	Wärtsilä - 5X72DF	3.8	A
5	PRISM AGILITY IMO 9810549	97,494	2019	299 m	Hyundai - 5X72DF	3.9	A
6	LNG HARMONY IMO 9917555	95,655	2023	299 m	Wärtsilä - 5X72DF	3.9	A
7	BW PAVILION VANDA IMO 9640437	86,401	2015	289 m	Wärtsilä - 2x12V50DF / 2x6L50DF	4.0	A
8	CLEAN DESTINY IMO 9943487	107,637	2023	300 m	Hyundai Heavy Industries Co Ltd - South Korea 6G70ME-C10-GA-EGRBP	4.0	A
10	CLEAN CAJUN IMO 9886732	107,662	2022	300 m	Wärtsilä - 5X72DF	4.1	A
9	PRISM BRILLIANCE IMO 9810551	97,493	2019	299 m	Hyundai - 5X72DF	4.1	A
11	ENERGY FIDELITY IMO 9540089	95,165	2023	290 m	HD Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	4.1	A
12	PRISM COURAGE IMO 9888481	97,494	2021	299 m	Hyundai - 5X72DF	4.2	A
13	ORION JESSICA IMO 9917543	95,400	2023	299 m	Wärtsilä - 5X72DF	4.2	A
14	MALAGA KNUTSEN IMO 9904182	95,548	2022	299 m	Wärtsilä - 5X72DF	4.2	A
15	BW PAVILION LEEARA IMO 9640645	86,383	2015	289 m	Wärtsilä - 2x12V50DF / 2x6L50DF	4.2	A
16	LNG PROSPERITY IMO 9902938	95,630	2023	299 m	Hyundai - 5X72DF	4.3	A
17	LNGSHIPS ATHENA IMO 9872949	93,534	2021	299 m	Hyundai - 5X72DF	4.3	A
18	REX TILLERSON IMO 9953248	93,076	2024	299 m	6X72DF-LPSCR	4.3	A
19	ORION BOHEMIA IMO 9902926	95,597	2022	299 m	Hyundai - 5X72DF	4.3	A
20	PRISM DIVERSITY IMO 9904651	97,494	2022	299 m	Hyundai - 5X72DF	4.3	A
21	FLEX VIGILANT IMO 9862475	93,764	2021	297 m	Hyundai - 5X72DF	4.4	A
22	LNGSHIPS MANHATTAN IMO 9872901	93,534	2021	299 m	Hyundai - 5X72DF	4.4	A
23	HUELVA KNUTSEN IMO 9904209	95,548	2022	299 m	Wärtsilä - 5X72DF	4.5	A
24	COBIA LNG IMO 9869306	93,534	2021	299 m	Hyundai - 5X72DF	4.5	A
25	GASLOG WELLINGTON IMO 9876660	93,694	2018	297 m	Wärtsilä - 5X72DF	4.5	A
26	LECH KACZYNSKI IMO 9922976	95,428	2022	299 m	Wärtsilä - 5X72DF	4.5	A
27	BONITO LNG IMO 9845788	93,534	2017	299 m	Hyundai - 5X72DF	4.5	A
28	MARVEL DOVE IMO 9964182	94,539	2024	290 m	Hyundai Heavy Industries Co. Ltd. 6G70ME-C10	4.5	A
29	COOL DISCOVERER IMO 9861031	93,667	2020	299 m	Hyundai - 5X72DF	4.5	A
30	MARVEL PHOENIX IMO 9962419	93,416	2024	295 m	MAN - 5G70ME-C10-GI	4.5	A
31	DORADO LNG IMO 9863182	94,000	2020	293 m	Wärtsilä - 5X72DF	4.6	A
32	CELSIUS CANBERRA IMO 9864796	92,454	2021	299 m	Wärtsilä - 5X72DF	4.7	A
33	SM ALBATROSS IMO 9902902	95,606	2022	299 m	Hyundai - 5X72DF	4.7	A
34	GRACE FREESIA IMO 9903920	89,789	2019	297 m	Wärtsilä - 5X72DF	4.7	A
35	COOL RACER IMO 9869265	93,423	2021	299 m	Wärtsilä - 5X72DF	4.7	A
36	CELSIUS CHARLOTTE IMO 9878711	92,253	2021	299 m	Wärtsilä - 5X72DF	4.8	A
37	PARIS KNUTSEN IMO 9946350	95,548	2023	299 m	HD Hyundai Heavy Industries Co Ltd - South Korea 5X72DF	4.8	A
38	SANTANDER KNUTSEN IMO 9904170	95,548	2022	299 m	Wärtsilä - 5X72DF	4.8	A
39	VIVIT AMERICAS LNG IMO 9864667	93,534	2020	299 m	Hyundai - 5X72DF	4.8	A
40	UMM GHUWAILINA IMO 9953250	93,058	2024	299 m	6X72DF-LPSCR	4.8	A
41	CELSIUS GANDHINAGAR IMO 9946829	92,385	2024	299 m	HSD Engine Co Ltd - South Korea 5G70ME-C10-GA	4.9	A
43	SM KESTREL IMO 9917579	95,817	2023	299 m	Wärtsilä - 5X72DF	4.9	A
42	MARVEL SWAN IMO 9880192	88,831	2021	293 m	HSD Engine Co Ltd - South Korea 5X72DF-LPSCR	4.9	A
44	MINERVA CHIOS IMO 9877341	88,228	2021	293 m	Wärtsilä - 5X72DF	4.9	A
45	NORTH AIR IMO 9953509	88,636	2023	293 m	—	4.9	A
46	ELISA LARUS IMO 9852975	95,418	2020	297 m	Hyundai - 5X72DF	4.9	A
48	GASLOG WINCHESTER IMO 9876737	93,678	2021	297 m	Wärtsilä - 6X62DF	4.9	A
47	DIAMOND GAS VICTORIA IMO 9874466	89,760	2021	297 m	Wärtsilä - 5X72DF	4.9	A
50	GRACE EMILIA IMO 9884174	89,729	2021	297 m	Hyundai - 5X72DF	4.9	A
49	DIAMOND GAS ORCHID IMO 9779226	94,028	2018	294 m	Mitsubishi - 1 x MR21-II, 3 x 6L50DF	4.9	A

Page 1 of 7 — 317 vessels

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.