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)

#304 of 317 lng carriers

CO₂ intensity

17.1 g CO₂/dwt·nm

vs segment average (8.11)

+111% higher

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
301	ARCTIC VOYAGER IMO 9275335	75,434	2006	290 m	Kawasaki - UA-400	16.2	E
302	CASTILLO DE VILLALBA IMO 9236418	77,217	2003	284 m	Kawasaki - UA-400	16.5	E
303	SEAPEAK CATALUNYA IMO 9236420	77,204	2003	284 m	Kawasaki - UA-400	17.1	E
304	LNG SOKOTO IMO 9216303	79,822	2002	289 m	Hyundai - MS35-2	17.9	E
305	RAVENNA KNUTSEN IMO 9874040	18,277	2021	180 m	Wartsila Finland Oy - Finland 5X52DF	18.3	E
306	ENERGY SPIRIT IMO 9269207	36,952	2006	220 m	Wärtsilä - 6L50DF	22.2	E
307	DAPENG PRINCESS IMO 9937907	45,462	2023	239 m	Wärtsilä - 5RT-flex50DF	22.9	E
308	K. LOTUS IMO 9901362	12,351	2022	166 m	Hyundai Heavy Industries Co Ltd - South Korea 6H35DF	23.5	E
309	CORAL FRASERI IMO 9378278	10,441	2010	137 m	MAK/Caterpillar - 7M43C	27.2	E
310	CORAL FUNGIA IMO 9378292	9,999	2011	137 m	MAK/Caterpillar - 7M43C	27.8	E
311	CORAL FAVIA IMO 9378280	10,441	2010	137 m	CATERPILLAR MOTOREN ROSTOCK GMBH 7M43C	27.9	E
312	CORAL FURCATA IMO 9378307	10,441	2011	137 m	MAK/Caterpillar - 7M43C	28.0	E
313	CORAL METHANE IMO 9404584	5,953	2009	118 m	Rolls-Royce Marine KVGS-12G4 / B32:40L8A	33.3	E
314	LEVANTE LNG IMO 9942524	9,173	2023	133 m	Hyundai Himsen 7H27DF	34.5	E
315	SEAPEAK HISPANIA IMO 9230048	79,363	2002	280 m	Kawasaki - UA-400	36.2	E
316	AVENIR ASCENSION IMO 9868974	4,716	2022	116 m	CSSC Marine Power Co Ltd 6L34DF	43.1	E
317	NEW FRONTIER 1 IMO 9765079	5,320	2017	120 m	Wärtsilä - 8L20DF	43.5	E

Page 7 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.