Most Emission-Efficient Oil Tankers
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 |
|---|---|---|---|---|---|
| 1151 |
TORM BIRGITTE
IMO 9664720
|
49,995 | 2012 |
5.0
|
D |
| 1152 |
AQUASMERALDA
IMO 9884801
|
50,295 | 2021 |
5.0
|
D |
| 1153 |
HAMBURG STAR
IMO 9298325
|
73,815 | 2005 |
5.0
|
D |
| 1154 |
PAULA GLORY
IMO 9952971
|
49,847 | 2023 |
5.0
|
D |
| 1155 |
CHEMTRANS BALTIC
IMO 9298301
|
73,897 | 2005 |
5.0
|
D |
| 1156 |
SILVER LINDA
IMO 9683415
|
49,746 | 2015 |
5.0
|
D |
| 1157 |
SEA HYMN
IMO 9412036
|
116,337 | 2011 |
5.0
|
D |
| 1158 |
STENA IMPERO
IMO 9797400
|
49,683 | 2018 |
5.0
|
D |
| 1159 |
STAMOS
IMO 9592276
|
115,497 | 2012 |
5.1
|
D |
| 1160 |
JENGGALA NASSIM
IMO 9457907
|
158,319 | 2013 |
5.1
|
D |
| 1161 |
SEA JAGUAR
IMO 9482627
|
114,024 | 2011 |
5.1
|
D |
| 1162 |
ADVANTAGE PORTO CERVO
IMO 9794850
|
74,000 | 2019 |
5.1
|
D |
| 1163 |
SILVER MILLIE
IMO 9692363
|
49,642 | 2015 |
5.1
|
D |
| 1164 |
MARAN ATLAS
IMO 9414022
|
105,071 | 2009 |
5.1
|
D |
| 1165 |
STI JARDINS
IMO 9794446
|
51,260 | 2018 |
5.1
|
D |
| 1166 |
ENERGY CHANCELLOR
IMO 9292606
|
70,558 | 2005 |
5.1
|
D |
| 1167 |
SILVER VALERIE
IMO 9682320
|
49,715 | 2014 |
5.1
|
D |
| 1168 |
STI VENERE
IMO 9681390
|
49,990 | 2012 |
5.1
|
D |
| 1169 |
HAFNIA AFRICA
IMO 9467811
|
74,539 | 2010 |
5.1
|
D |
| 1170 |
SUNNY LIGER
IMO 9332626
|
74,997 | 2008 |
5.1
|
D |
| 1171 |
STI GALATA
IMO 9785689
|
51,546 | 2017 |
5.1
|
D |
| 1172 |
FEDOR
IMO 9259317
|
70,156 | 2003 |
5.1
|
D |
| 1173 |
SAFEEN BARONESS
IMO 9460576
|
105,335 | 2011 |
5.1
|
D |
| 1174 |
TORM SPLENDID
IMO 9854791
|
49,932 | 2020 |
5.1
|
D |
| 1175 |
JAG PRACHI
IMO 9590723
|
51,486 | 2013 |
5.1
|
D |
| 1176 |
MAERSK CYPRUS
IMO 9786217
|
49,919 | 2020 |
5.1
|
D |
| 1177 |
ATLANTIC FALCON
IMO 9789257
|
49,951 | 2018 |
5.1
|
D |
| 1178 |
NORD STAR
IMO 9323596
|
49,631 | 2006 |
5.1
|
D |
| 1179 |
MINERVA LIBRA
IMO 9317951
|
116,779 | 2007 |
5.1
|
D |
| 1180 |
DAPHNE V
IMO 9321677
|
114,523 | 2006 |
5.1
|
D |
| 1181 |
CL TONI MORRISON
IMO 9943384
|
49,352 | 2024 |
5.2
|
D |
| 1182 |
POSILLIPO
IMO 9389849
|
74,999 | 2009 |
5.2
|
D |
| 1183 |
CHRYSTAL ARCTIC
IMO 9332640
|
74,910 | 2010 |
5.2
|
D |
| 1184 |
PATMOS WARRIOR
IMO 9337418
|
105,572 | 2007 |
5.2
|
D |
| 1185 |
CL MARGUERITE DURAS
IMO 9943358
|
49,357 | 2023 |
5.2
|
D |
| 1186 |
PINTAIL PACIFIC
IMO 9983891
|
49,773 | 2024 |
5.2
|
D |
| 1187 |
SEAMUSIC
IMO 9407445
|
112,922 | 2009 |
5.2
|
D |
| 1188 |
PAROS
IMO 9296195
|
107,197 | 2003 |
5.2
|
D |
| 1189 |
ANAFI WARRIOR
IMO 9370848
|
107,593 | 2005 |
5.2
|
D |
| 1190 |
MAERSK TEESPORT
IMO 9726463
|
49,990 | 2016 |
5.2
|
D |
| 1191 |
PIURA PACIFIC
IMO 9983889
|
49,805 | 2024 |
5.2
|
D |
| 1192 |
SIGMA TRIUMPH
IMO 9410650
|
105,291 | 2009 |
5.2
|
D |
| 1193 |
TORM TROILUS
IMO 9726475
|
49,757 | 2016 |
5.2
|
D |
| 1194 |
CONSTELLATION
IMO 9308091
|
73,917 | 2006 |
5.2
|
D |
| 1195 |
FRONT SIRIUS
IMO 9767340
|
110,000 | 2014 |
5.2
|
D |
| 1196 |
TORM AUSTRALIA
IMO 9443140
|
49,999 | 2011 |
5.2
|
D |
| 1197 |
LVM WARRIOR
IMO 9694189
|
49,997 | 2015 |
5.2
|
D |
| 1198 |
KMARIN RESOLUTION
IMO 9683051
|
109,484 | 2016 |
5.2
|
D |
| 1199 |
SEA CAELUM
IMO 9724582
|
45,999 | 2016 |
5.2
|
D |
| 1200 |
STENA CONDUCTOR
IMO 9934888
|
49,999 | 2022 |
5.2
|
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.