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.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 301 |
ARCTIC VOYAGER
IMO 9275335
|
75,434 | 2006 |
16.2
|
E |
| 302 |
CASTILLO DE VILLALBA
IMO 9236418
|
77,217 | 2003 |
16.5
|
E |
| 303 |
SEAPEAK CATALUNYA
IMO 9236420
|
77,204 | 2003 |
17.1
|
E |
| 304 |
LNG SOKOTO
IMO 9216303
|
79,822 | 2002 |
17.9
|
E |
| 305 |
RAVENNA KNUTSEN
IMO 9874040
|
18,277 | 2021 |
18.3
|
E |
| 306 |
ENERGY SPIRIT
IMO 9269207
|
36,952 | 2006 |
22.2
|
E |
| 307 |
DAPENG PRINCESS
IMO 9937907
|
45,462 | 2023 |
22.9
|
E |
| 308 |
K. LOTUS
IMO 9901362
|
12,351 | 2022 |
23.5
|
E |
| 309 |
CORAL FRASERI
IMO 9378278
|
10,441 | 2010 |
27.2
|
E |
| 310 |
CORAL FUNGIA
IMO 9378292
|
9,999 | 2011 |
27.8
|
E |
| 311 |
CORAL FAVIA
IMO 9378280
|
10,441 | 2010 |
27.9
|
E |
| 312 |
CORAL FURCATA
IMO 9378307
|
10,441 | 2011 |
28.0
|
E |
| 313 |
CORAL METHANE
IMO 9404584
|
5,953 | 2009 |
33.3
|
E |
| 314 |
LEVANTE LNG
IMO 9942524
|
9,173 | 2023 |
34.5
|
E |
| 315 |
SEAPEAK HISPANIA
IMO 9230048
|
79,363 | 2002 |
36.2
|
E |
| 316 |
AVENIR ASCENSION
IMO 9868974
|
4,716 | 2022 |
43.1
|
E |
| 317 |
NEW FRONTIER 1
IMO 9765079
|
5,320 | 2017 |
43.5
|
E |
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.
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.