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 |
|---|---|---|---|---|---|
| 201 |
METHANE JULIA LOUISE
IMO 9412880
|
86,125 | 2006 |
7.8
|
D |
| 202 |
AL ORAIQ
IMO 9360790
|
122,079 | 2005 |
7.8
|
D |
| 203 |
AL KHARAITIYAT
IMO 9397327
|
113,845 | 2009 |
7.8
|
D |
| 204 |
AL KHARSAAH
IMO 9360881
|
116,267 | 2008 |
7.8
|
D |
| 205 |
LENA RIVER
IMO 9629598
|
84,585 | 2013 |
7.8
|
D |
| 206 |
CASTILLO DE MERIDA
IMO 9742807
|
93,241 | 2018 |
7.9
|
D |
| 207 |
AL GHARIYA
IMO 9337987
|
121,730 | 2008 |
8.0
|
D |
| 208 |
COOL EXPLORER
IMO 9640023
|
81,893 | 2015 |
8.0
|
D |
| 209 |
AL SAHLA
IMO 9360855
|
113,715 | 2008 |
8.0
|
D |
| 210 |
AL SHAMAL
IMO 9360893
|
116,444 | 2008 |
8.0
|
D |
| 211 |
AL KHUWAIR
IMO 9360908
|
116,337 | 2005 |
8.2
|
D |
| 212 |
KOOL CRYSTAL
IMO 9624926
|
82,058 | 2014 |
8.2
|
D |
| 213 |
AL KARAANA
IMO 9431123
|
122,052 | 2009 |
8.3
|
D |
| 214 |
FRAIHA
IMO 9360817
|
121,913 | 2005 |
8.3
|
D |
| 215 |
RIBERA DEL DUERO KNUTSEN
IMO 9477593
|
100,006 | 2010 |
8.3
|
D |
| 216 |
TANGGUH PALUNG
IMO 9355379
|
82,407 | 2009 |
8.3
|
D |
| 217 |
CUBAL
IMO 9491812
|
82,834 | 2012 |
8.4
|
D |
| 218 |
GUI YING
IMO 9878888
|
91,497 | 2021 |
8.4
|
D |
| 219 |
NIKOLAY ZUBOV
IMO 9768526
|
96,865 | 2019 |
8.4
|
D |
| 220 |
BORIS DAVYDOV
IMO 9768394
|
96,765 | 2018 |
8.4
|
D |
| 221 |
LNG RIVER ORASHI
IMO 9266982
|
83,068 | 2004 |
8.4
|
D |
| 222 |
SEAPEAK ARWA
IMO 9339260
|
82,187 | 2008 |
8.4
|
D |
| 223 |
COOL RUNNER
IMO 9636797
|
81,893 | 2014 |
8.5
|
D |
| 224 |
SEAPEAK MAGELLAN
IMO 9342487
|
82,265 | 2009 |
8.5
|
D |
| 225 |
LNG ENUGU
IMO 9266994
|
83,160 | 2005 |
8.5
|
D |
| 226 |
GASLOG SAVANNAH
IMO 9352860
|
82,291 | 2005 |
8.6
|
D |
| 227 |
SEAPEAK MERIDIAN
IMO 9369904
|
81,929 | 2010 |
8.6
|
D |
| 228 |
FLEX ENDEAVOUR
IMO 9762261
|
85,000 | 2018 |
8.6
|
D |
| 229 |
AL BAHIYA
IMO 9431147
|
121,957 | 2010 |
8.6
|
D |
| 230 |
LNG IMO
IMO 9311581
|
83,684 | 2008 |
8.6
|
D |
| 231 |
LNG KANO
IMO 9311567
|
83,961 | 2007 |
8.6
|
D |
| 232 |
AL HUWAILA
IMO 9360879
|
116,285 | 2008 |
8.7
|
D |
| 233 |
GEORGIY BRUSILOV
IMO 9768382
|
96,847 | 2018 |
8.7
|
D |
| 234 |
MALANJE
IMO 9490959
|
82,728 | 2011 |
8.8
|
D |
| 235 |
AL UTOURIYA
IMO 9360867
|
113,609 | 2008 |
8.8
|
D |
| 236 |
AAMIRA
IMO 9443401
|
143,165 | 2010 |
8.8
|
D |
| 237 |
EDUARD TOLL
IMO 9750696
|
96,839 | 2017 |
8.8
|
D |
| 238 |
LNG ONDO
IMO 9311579
|
83,688 | 2007 |
8.9
|
D |
| 239 |
LNG LOKOJA
IMO 9269960
|
83,965 | 2006 |
8.9
|
D |
| 240 |
TRADER II
IMO 9238038
|
75,109 | 2002 |
8.9
|
D |
| 241 |
VLADIMIR VIZE
IMO 9750658
|
96,851 | 2018 |
9.0
|
D |
| 242 |
BORIS VILKITSKY
IMO 9768368
|
96,958 | 2017 |
9.0
|
D |
| 243 |
AL THUMAMA
IMO 9360843
|
113,749 | 2008 |
9.0
|
D |
| 244 |
LNG OGUN
IMO 9322815
|
81,997 | 2007 |
9.0
|
D |
| 245 |
KOOL BALTIC
IMO 9654878
|
93,508 | 2015 |
9.1
|
D |
| 246 |
FEDOR LITKE
IMO 9768370
|
96,839 | 2017 |
9.1
|
D |
| 247 |
YAKOV GAKKEL
IMO 9750672
|
96,839 | 2019 |
9.1
|
D |
| 248 |
FLEX CONSTELLATION
IMO 9825427
|
95,452 | 2017 |
9.1
|
D |
| 249 |
GEORGIY USHAKOV
IMO 9750749
|
96,796 | 2019 |
9.2
|
D |
| 250 |
GRACE DAHLIA
IMO 9540716
|
86,512 | 2013 |
9.2
|
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 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.