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 |
|---|---|---|---|---|---|
| 301 |
RIBERA DEL DUERO KNUTSEN
IMO 9477593
|
100,006 | 2010 |
8.6
|
D |
| 302 |
LOBITO
IMO 9490961
|
82,929 | 2011 |
8.6
|
D |
| 303 |
SEAPEAK MERIDIAN
IMO 9369904
|
81,929 | 2010 |
8.6
|
D |
| 304 |
CUBAL
IMO 9491812
|
82,834 | 2012 |
8.6
|
D |
| 305 |
FEDOR LITKE
IMO 9768370
|
96,839 | 2017 |
8.6
|
D |
| 306 |
YAKOV GAKKEL
IMO 9750672
|
96,839 | 2019 |
8.6
|
E |
| 307 |
SEAPEAK ARWA
IMO 9339260
|
82,187 | 2008 |
8.7
|
E |
| 308 |
LNG KANO
IMO 9311567
|
83,961 | 2007 |
8.8
|
E |
| 309 |
AL GHARRAFA
IMO 9337717
|
113,861 | 2008 |
8.8
|
E |
| 310 |
RUDOLF SAMOYLOVICH
IMO 9750713
|
96,703 | 2018 |
8.8
|
E |
| 311 |
LNG LOKOJA
IMO 9269960
|
83,965 | 2006 |
8.8
|
E |
| 312 |
EDUARD TOLL
IMO 9750696
|
96,839 | 2017 |
8.9
|
E |
| 313 |
VLADIMIR VORONIN
IMO 9750737
|
96,840 | 2019 |
8.9
|
E |
| 314 |
LNG IMO
IMO 9311581
|
83,684 | 2008 |
9.0
|
E |
| 315 |
BERGE ARZEW
IMO 9256597
|
77,470 | 2004 |
9.0
|
E |
| 316 |
AL SHAMAL
IMO 9360893
|
116,444 | 2008 |
9.1
|
E |
| 317 |
GEORGIY USHAKOV
IMO 9750749
|
96,796 | 2019 |
9.1
|
E |
| 318 |
NIKOLAY YEVGENOV
IMO 9750725
|
96,821 | 2019 |
9.1
|
E |
| 319 |
AL THUMAMA
IMO 9360843
|
113,749 | 2008 |
9.1
|
E |
| 320 |
VLADIMIR VIZE
IMO 9750658
|
96,851 | 2018 |
9.1
|
E |
| 321 |
SONANGOL BENGUELA
IMO 9482304
|
89,806 | 2011 |
9.2
|
E |
| 322 |
NIKOLAY URVANTSEV
IMO 9750660
|
96,779 | 2019 |
9.2
|
E |
| 323 |
LENA RIVER
IMO 9629598
|
84,585 | 2013 |
9.3
|
E |
| 324 |
LNG OGUN
IMO 9322815
|
81,997 | 2007 |
9.3
|
E |
| 325 |
AL GATTARA
IMO 9337705
|
113,590 | 2007 |
9.3
|
E |
| 326 |
AL SAHLA
IMO 9360855
|
113,715 | 2008 |
9.3
|
E |
| 327 |
ZARGA
IMO 9431214
|
143,350 | 2010 |
9.4
|
E |
| 328 |
VLADIMIR RUSANOV
IMO 9750701
|
96,844 | 2018 |
9.4
|
E |
| 329 |
POINT FORTIN
IMO 9375721
|
79,592 | 2010 |
9.4
|
E |
| 330 |
SONANGOL ETOSHA
IMO 9482299
|
89,931 | 2011 |
9.4
|
E |
| 331 |
TEMBEK
IMO 9337731
|
113,586 | 2007 |
9.6
|
E |
| 332 |
LNG OYO
IMO 9267003
|
83,068 | 2005 |
9.6
|
E |
| 333 |
LNG CROSS RIVER
IMO 9262223
|
79,591 | 2005 |
9.7
|
E |
| 334 |
SONANGOL SAMBIZANGA
IMO 9475600
|
89,742 | 2007 |
9.7
|
E |
| 335 |
MARAN GAS ASCLEPIUS
IMO 9302499
|
79,460 | 2005 |
9.9
|
E |
| 336 |
SEAPEAK METHANE
IMO 9336737
|
82,115 | 2008 |
10.0
|
E |
| 337 |
LNG BORNO
IMO 9322803
|
82,030 | 2007 |
10.1
|
E |
| 338 |
LNG PHECDA
IMO 9834313
|
91,712 | 2020 |
10.2
|
E |
| 339 |
AMUR RIVER
IMO 9317999
|
84,598 | 2008 |
10.4
|
E |
| 340 |
AL WAJBAH
IMO 9085625
|
72,348 | 1997 |
10.6
|
E |
| 341 |
LNG ONDO
IMO 9311579
|
83,688 | 2007 |
10.9
|
E |
| 342 |
LNG ADAMAWA
IMO 9262211
|
79,566 | 2005 |
11.0
|
E |
| 343 |
LNG RIVER NIGER
IMO 9262235
|
79,541 | 2006 |
11.0
|
E |
| 344 |
LNG AKWA IBOM
IMO 9262209
|
79,633 | 2004 |
11.1
|
E |
| 345 |
CADIZ KNUTSEN
IMO 9246578
|
77,228 | 2004 |
11.2
|
E |
| 346 |
LNG BENUE
IMO 9267015
|
82,971 | 2006 |
11.4
|
E |
| 347 |
SEAPEAK GALICIA
IMO 9247364
|
79,166 | 2004 |
11.6
|
E |
| 348 |
AL KHOR
IMO 9085613
|
72,176 | 1996 |
11.8
|
E |
| 349 |
AL DAAYEN
IMO 9325702
|
90,617 | 2007 |
12.1
|
E |
| 350 |
ARCTIC AURORA
IMO 9645970
|
84,604 | 2013 |
12.2
|
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.