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 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 |
|---|---|---|---|---|---|
| 1051 |
PRATINCOLE PACIFIC
IMO 9887621
|
49,941 | 2020 |
4.8
|
D |
| 1052 |
HAFNIA LEOPARD
IMO 9635822
|
49,999 | 2014 |
4.8
|
D |
| 1053 |
MAERSK TOKYO
IMO 9718076
|
50,000 | 2016 |
4.8
|
D |
| 1054 |
HAFNIA EAGLE
IMO 9708071
|
49,999 | 2015 |
4.8
|
D |
| 1055 |
AMALTHEA
IMO 9298650
|
107,115 | 2006 |
4.8
|
D |
| 1056 |
TROUVAILLE
IMO 9939632
|
49,999 | 2025 |
4.8
|
D |
| 1057 |
ENERGY ARTEMIS
IMO 9928750
|
49,812 | 2022 |
4.8
|
D |
| 1058 |
CL TONI MORRISON
IMO 9943384
|
49,352 | 2024 |
4.8
|
D |
| 1059 |
MARI KOKAKO
IMO 9848687
|
49,765 | 2019 |
4.8
|
D |
| 1060 |
NEW LIBERTY
IMO 9411082
|
164,028 | 2010 |
4.8
|
D |
| 1061 |
ENERGY ARIADNE
IMO 9906087
|
49,812 | 2021 |
4.8
|
D |
| 1062 |
KRITI LEGEND
IMO 9398266
|
107,518 | 2009 |
4.8
|
D |
| 1063 |
HAFNIA LYNX
IMO 9635808
|
49,999 | 2013 |
4.9
|
D |
| 1064 |
MARAN WIND
IMO 9863560
|
103,118 | 2021 |
4.9
|
D |
| 1065 |
ASHLEY LADY
IMO 9429039
|
112,043 | 2010 |
4.9
|
D |
| 1066 |
AKRISIOS
IMO 9953456
|
50,113 | 2023 |
4.9
|
D |
| 1067 |
GEM RUBY
IMO 1015868
|
49,999 | 2025 |
4.9
|
D |
| 1068 |
SEAWAYS CASTLE HILL
IMO 9697636
|
49,990 | 2015 |
4.9
|
D |
| 1069 |
APNOIA
IMO 9448152
|
74,811 | 2009 |
4.9
|
D |
| 1070 |
ALTAI
IMO 9446427
|
115,952 | 2006 |
4.9
|
D |
| 1071 |
CINDY GLORY
IMO 9952945
|
49,700 | 2023 |
4.9
|
D |
| 1072 |
BOURDA
IMO 9312846
|
105,611 | 2006 |
4.9
|
D |
| 1073 |
STI DONALD C TRAUSCHT
IMO 9794422
|
51,260 | 2017 |
4.9
|
D |
| 1074 |
MINERVA KYTHNOS
IMO 9592252
|
115,674 | 2011 |
4.9
|
D |
| 1075 |
HAFNIA TIGER
IMO 9635846
|
49,999 | 2014 |
4.9
|
D |
| 1076 |
AQUASMERALDA
IMO 9884801
|
50,295 | 2021 |
4.9
|
D |
| 1077 |
YPAPANTI
IMO 9693082
|
109,999 | 2016 |
4.9
|
D |
| 1078 |
JASMIN JOY
IMO 9427471
|
104,604 | 2009 |
4.9
|
D |
| 1079 |
SEA TIGER
IMO 9834870
|
49,821 | 2019 |
4.9
|
D |
| 1080 |
HELLAS MARGARITA
IMO 9794721
|
49,879 | 2017 |
4.9
|
D |
| 1081 |
CHEMTRANS NOVA
IMO 9316232
|
73,870 | 2006 |
4.9
|
D |
| 1082 |
LVM AARON
IMO 9669926
|
50,927 | 2014 |
4.9
|
D |
| 1083 |
SAKURA PRINCESS
IMO 9358541
|
105,365 | 2007 |
4.9
|
D |
| 1084 |
AMAZON FALCON
IMO 9779587
|
72,390 | 2017 |
4.9
|
D |
| 1085 |
STI MEMPHIS
IMO 9681156
|
49,995 | 2014 |
4.9
|
D |
| 1086 |
HAFNIA NANJING
IMO 9863235
|
74,999 | 2021 |
4.9
|
D |
| 1087 |
BLACKCOMB SPIRIT
IMO 9417335
|
110,000 | 2010 |
4.9
|
D |
| 1088 |
CL VIRGINIA WOOLF
IMO 9943396
|
49,359 | 2024 |
5.0
|
D |
| 1089 |
HELLAS TATIANA
IMO 9794719
|
49,834 | 2017 |
5.0
|
D |
| 1090 |
SL HAWAII
IMO 9776470
|
50,118 | 2015 |
5.0
|
D |
| 1091 |
PALOMA
IMO 9324318
|
76,578 | 2007 |
5.0
|
D |
| 1092 |
LARGO EDEN
IMO 9935909
|
49,999 | 2022 |
5.0
|
D |
| 1093 |
JAG PRIYA
IMO 9425514
|
49,999 | 2010 |
5.0
|
D |
| 1094 |
MARAN WAVE
IMO 9863558
|
103,158 | 2021 |
5.0
|
D |
| 1095 |
ADVANTAGE PARADISE
IMO 9577056
|
74,602 | 2010 |
5.0
|
D |
| 1096 |
LAGOM
IMO 9939606
|
49,999 | 2024 |
5.0
|
D |
| 1097 |
VS PRIDE
IMO 9351414
|
73,727 | 2006 |
5.0
|
D |
| 1098 |
ARIANE
IMO 9351464
|
73,784 | 2007 |
5.0
|
D |
| 1099 |
BODIL KNUTSEN
IMO 9472529
|
157,644 | 2011 |
5.0
|
D |
| 1100 |
SERENO
IMO 9437658
|
74,834 | 2009 |
5.0
|
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.