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.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 351 |
GRACE DAHLIA
IMO 9540716
|
86,512 | 2013 |
12.2
|
E |
| 352 |
IBERICA KNUTSEN
IMO 9326603
|
77,541 | 2006 |
12.6
|
E |
| 353 |
UMM BAB
IMO 9308431
|
79,460 | 2005 |
12.9
|
E |
| 354 |
AL WAKRAH
IMO 9086746
|
72,453 | 1998 |
13.0
|
E |
| 355 |
AL MARROUNA
IMO 9325685
|
81,936 | 2006 |
13.1
|
E |
| 356 |
MILAHA QATAR
IMO 9321732
|
77,803 | 2006 |
13.2
|
E |
| 357 |
SEAPEAK MARS
IMO 9259276
|
77,213 | 2004 |
13.2
|
E |
| 358 |
CLEAN ENERGY
IMO 9323687
|
85,513 | 2007 |
13.6
|
E |
| 359 |
LUSAIL
IMO 9285952
|
78,541 | 2005 |
13.7
|
E |
| 360 |
AL RAYYAN
IMO 9086734
|
72,430 | 1997 |
13.9
|
E |
| 361 |
CORAL ENERGICE
IMO 9783124
|
11,930 | 2018 |
15.7
|
E |
| 362 |
CORAL ENERGY
IMO 9617698
|
12,268 | 2013 |
16.1
|
E |
| 363 |
ARCTIC LADY
IMO 9284192
|
84,878 | 2006 |
17.2
|
E |
| 364 |
ENERGY SPIRIT
IMO 9269207
|
36,952 | 2006 |
17.4
|
E |
| 365 |
LNG SOKOTO
IMO 9216303
|
79,822 | 2002 |
17.5
|
E |
| 366 |
RAVENNA KNUTSEN
IMO 9874040
|
18,277 | 2021 |
18.0
|
E |
| 367 |
ARCTIC VOYAGER
IMO 9275335
|
75,434 | 2006 |
18.8
|
E |
| 368 |
ARCTIC PRINCESS
IMO 9271248
|
84,878 | 2006 |
19.9
|
E |
| 369 |
ARCTIC DISCOVERER
IMO 9276389
|
75,485 | 2006 |
20.8
|
E |
| 370 |
ENERGOS POWER
IMO 9861809
|
94,414 | 2021 |
21.9
|
E |
| 371 |
K. LOTUS
IMO 9901362
|
12,351 | 2022 |
22.6
|
E |
| 372 |
TITAN VISION
IMO 9468449
|
12,214 | 2011 |
23.1
|
E |
| 373 |
COOL ROVER
IMO 9333618
|
84,455 | 2008 |
23.3
|
E |
| 374 |
CORAL ENCANTO
IMO 9693719
|
18,637 | 2018 |
23.9
|
E |
| 375 |
CORAL NORDIC
IMO 9919890
|
17,233 | 2022 |
24.5
|
E |
| 376 |
NEW FRONTIER 1
IMO 9765079
|
5,320 | 2017 |
24.9
|
E |
| 377 |
CORAL FURCATA
IMO 9378307
|
10,441 | 2011 |
26.2
|
E |
| 378 |
CORAL FUNGIA
IMO 9378292
|
9,999 | 2011 |
26.6
|
E |
| 379 |
CORAL EVOLUTION
IMO 9955521
|
18,397 | 2024 |
26.7
|
E |
| 380 |
CORAL FRASERI
IMO 9378278
|
10,441 | 2010 |
27.7
|
E |
| 381 |
CASTILLO DE VILLALBA
IMO 9236418
|
77,217 | 2003 |
29.9
|
E |
| 382 |
CORAL METHANE
IMO 9404584
|
5,953 | 2009 |
33.3
|
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 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.
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.