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 |
|---|---|---|---|---|---|
| 251 |
GASLOG GIBRALTAR
IMO 9707510
|
94,000 | 2013 |
6.8
|
D |
| 252 |
BW PAVILION ARANDA
IMO 9792606
|
90,381 | 2019 |
6.8
|
D |
| 253 |
MARAN GAS AGAMEMNON
IMO 9682590
|
92,762 | 2016 |
6.8
|
D |
| 254 |
SHAOLIN
IMO 9915894
|
91,752 | 2022 |
6.8
|
D |
| 255 |
CASTILLO DE MERIDA
IMO 9742807
|
93,241 | 2018 |
6.8
|
D |
| 256 |
GASLOG SEATTLE
IMO 9634086
|
81,982 | 2013 |
7.0
|
D |
| 257 |
GASLOG SKAGEN
IMO 9626285
|
81,846 | 2013 |
7.0
|
D |
| 258 |
LNG FINIMA II
IMO 9690145
|
86,867 | 2015 |
7.1
|
D |
| 259 |
BRITISH SPONSOR
IMO 9766580
|
94,360 | 2019 |
7.1
|
D |
| 260 |
AL KARAANA
IMO 9431123
|
122,052 | 2009 |
7.1
|
D |
| 261 |
WILFORCE
IMO 9627954
|
87,750 | 2013 |
7.1
|
D |
| 262 |
FRAIHA
IMO 9360817
|
121,913 | 2005 |
7.3
|
D |
| 263 |
MURWAB
IMO 9360805
|
121,843 | 2008 |
7.3
|
D |
| 264 |
AL BAHIYA
IMO 9431147
|
121,957 | 2010 |
7.3
|
D |
| 265 |
WEN CHENG
IMO 9892121
|
91,218 | 2023 |
7.3
|
D |
| 266 |
KOOL CRYSTAL
IMO 9624926
|
82,058 | 2014 |
7.5
|
D |
| 267 |
AL ORAIQ
IMO 9360790
|
122,079 | 2005 |
7.5
|
D |
| 268 |
NIKOLAY ZUBOV
IMO 9768526
|
96,865 | 2019 |
7.5
|
D |
| 269 |
BW BRUSSELS
IMO 9368314
|
84,483 | 2009 |
7.6
|
D |
| 270 |
AL AAMRIYA
IMO 9338266
|
121,935 | 2008 |
7.6
|
D |
| 271 |
AL SAFLIYA
IMO 9337963
|
121,963 | 2007 |
7.7
|
D |
| 272 |
SEAPEAK MAGELLAN
IMO 9342487
|
82,265 | 2009 |
7.7
|
D |
| 273 |
DUHAIL
IMO 9337975
|
121,639 | 2008 |
7.7
|
D |
| 274 |
UMM AL AMAD
IMO 9360829
|
121,730 | 2008 |
7.7
|
D |
| 275 |
AL RUWAIS
IMO 9337951
|
121,823 | 2007 |
7.7
|
D |
| 276 |
MESAIMEER
IMO 9337729
|
113,852 | 2009 |
7.8
|
D |
| 277 |
MEKAINES
IMO 9397303
|
143,309 | 2009 |
7.8
|
D |
| 278 |
AL KHARAITIYAT
IMO 9397327
|
113,845 | 2009 |
7.8
|
D |
| 279 |
AAMIRA
IMO 9443401
|
143,165 | 2010 |
7.8
|
D |
| 280 |
AL KHATTIYA
IMO 9431111
|
121,946 | 2009 |
7.8
|
D |
| 281 |
AL SHEEHANIYA
IMO 9360831
|
122,006 | 2009 |
7.8
|
D |
| 282 |
AL GHASHAMIYA
IMO 9397286
|
115,771 | 2009 |
7.9
|
D |
| 283 |
AL KHARSAAH
IMO 9360881
|
116,267 | 2008 |
7.9
|
D |
| 284 |
SOYO
IMO 9475208
|
82,857 | 2011 |
8.1
|
D |
| 285 |
CLEAN HORIZON
IMO 9655444
|
89,831 | 2015 |
8.1
|
D |
| 286 |
GEORGIY BRUSILOV
IMO 9768382
|
96,847 | 2018 |
8.2
|
D |
| 287 |
AL HUWAILA
IMO 9360879
|
116,285 | 2008 |
8.2
|
D |
| 288 |
AL KHUWAIR
IMO 9360908
|
116,337 | 2005 |
8.2
|
D |
| 289 |
GASLOG SAVANNAH
IMO 9352860
|
82,291 | 2005 |
8.2
|
D |
| 290 |
SEAPEAK MARIB
IMO 9336749
|
82,095 | 2008 |
8.2
|
D |
| 291 |
BORIS DAVYDOV
IMO 9768394
|
96,765 | 2018 |
8.3
|
D |
| 292 |
MOZAH
IMO 9337755
|
130,102 | 2008 |
8.3
|
D |
| 293 |
AL REKAYYAT
IMO 9397339
|
113,857 | 2009 |
8.3
|
D |
| 294 |
AL UTOURIYA
IMO 9360867
|
113,609 | 2008 |
8.3
|
D |
| 295 |
MALANJE
IMO 9490959
|
82,728 | 2011 |
8.4
|
D |
| 296 |
BORIS VILKITSKY
IMO 9768368
|
96,958 | 2017 |
8.4
|
D |
| 297 |
LNG ENUGU
IMO 9266994
|
83,160 | 2005 |
8.4
|
D |
| 298 |
AL HAMLA
IMO 9337743
|
113,584 | 2008 |
8.5
|
D |
| 299 |
ONAIZA
IMO 9397353
|
121,938 | 2009 |
8.5
|
D |
| 300 |
METHANE BECKI ANNE
IMO 9516129
|
86,268 | 2010 |
8.5
|
D |
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.