Most Emission-Efficient Chemical 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 |
|---|---|---|---|---|---|
| 102 |
ELANDRA MAPLE
IMO 9831191
|
49,999 | 2018 |
4.9
|
A |
| 101 |
CAPE TALLIN
IMO 9441154
|
73,662 | 2008 |
4.9
|
A |
| 103 |
STENA CONTINENT
IMO 1022706
|
49,948 | 2025 |
4.9
|
A |
| 104 |
TORM MALAYSIA
IMO 9443164
|
49,999 | 2011 |
4.9
|
A |
| 108 |
JANE
IMO 9364588
|
51,506 | 2008 |
4.9
|
A |
| 107 |
MARI INNOVATOR
IMO 9909572
|
49,999 | 2021 |
4.9
|
A |
| 106 |
ELDIA
IMO 9798351
|
49,996 | 2019 |
4.9
|
A |
| 105 |
ELANDRA MELODY
IMO 9676527
|
50,886 | 2014 |
4.9
|
A |
| 109 |
NORD HARMONY
IMO 9870719
|
50,494 | 2020 |
5.0
|
A |
| 110 |
STI MAVERICK
IMO 9833589
|
49,999 | 2019 |
5.0
|
A |
| 113 |
BULLDOG
IMO 9858072
|
49,856 | 2020 |
5.0
|
A |
| 112 |
HAFNIA MIKALA
IMO 9732709
|
49,999 | 2017 |
5.0
|
A |
| 111 |
LILA MIAMI
IMO 9332303
|
49,999 | 2007 |
5.0
|
A |
| 114 |
ST. MICHAELIS
IMO 9788473
|
50,159 | 2018 |
5.0
|
A |
| 117 |
PACIFIC DEBBIE
IMO 9772058
|
73,500 | 2015 |
5.0
|
A |
| 116 |
LORA
IMO 9917804
|
55,202 | 2022 |
5.0
|
A |
| 115 |
POINT LISAS
IMO 9905162
|
49,996 | 2021 |
5.0
|
A |
| 118 |
TRISTAR JISHA
IMO 9655975
|
49,999 | 2014 |
5.0
|
A |
| 119 |
ATLANTIC INFINITY
IMO 9797759
|
50,090 | 2017 |
5.0
|
A |
| 120 |
SEAPROMISE
IMO 9934125
|
50,394 | 2022 |
5.0
|
A |
| 123 |
ZOILO
IMO 9704441
|
49,990 | 2015 |
5.0
|
A |
| 122 |
SILVER ELLIE
IMO 9692387
|
49,950 | 2015 |
5.0
|
A |
| 121 |
MATRAH
IMO 9405849
|
51,021 | 2008 |
5.0
|
A |
| 124 |
PACIFIC CITRINE
IMO 9906893
|
50,299 | 2021 |
5.0
|
A |
| 127 |
TORM TITAN
IMO 9712319
|
49,757 | 2016 |
5.0
|
A |
| 126 |
NAVIG8 GLADIATOR
IMO 9853230
|
49,762 | 2019 |
5.0
|
A |
| 125 |
ZANDOLIE
IMO 9893163
|
50,494 | 2021 |
5.0
|
A |
| 128 |
OLYMPIOS
IMO 9919620
|
50,434 | 2020 |
5.0
|
A |
| 131 |
CLEAROCEAN MARIGOLD
IMO 9655987
|
49,999 | 2014 |
5.0
|
A |
| 130 |
TORM STRONG
IMO 9836062
|
49,954 | 2019 |
5.0
|
A |
| 129 |
YASA HAWK
IMO 9619531
|
49,990 | 2017 |
5.0
|
A |
| 132 |
PRECIOUS ADELAIDE
IMO 9982548
|
49,999 | 2024 |
5.0
|
A |
| 133 |
ATLANTIC SUNFLOWER
IMO 9993872
|
49,999 | 2025 |
5.0
|
A |
| 134 |
PIS PRECIOUS
IMO 9689158
|
50,258 | 2013 |
5.1
|
A |
| 136 |
GORDONS BAY
IMO 9997220
|
49,999 | 2025 |
5.1
|
A |
| 138 |
PICO BASILE
IMO 9776250
|
51,525 | 2016 |
5.1
|
A |
| 135 |
HYGGE
IMO 9939589
|
49,999 | 2024 |
5.1
|
A |
| 137 |
FPMC 32
IMO 9831701
|
49,660 | 2019 |
5.1
|
A |
| 139 |
YAQUT
IMO 9917878
|
55,202 | 2022 |
5.1
|
A |
| 141 |
KATHERINE LADY
IMO 9916123
|
49,999 | 2022 |
5.1
|
A |
| 140 |
SILVER GINNY
IMO 9682318
|
49,746 | 2012 |
5.1
|
A |
| 142 |
CHALLENGE PINNACLE
IMO 9788588
|
49,996 | 2015 |
5.1
|
A |
| 143 |
JAL KALP
IMO 1014008
|
50,664 | 2025 |
5.1
|
A |
| 144 |
ARDMORE GIBRALTAR
IMO 9790373
|
49,999 | 2017 |
5.1
|
A |
| 147 |
NORD VENTURA
IMO 9910337
|
49,999 | 2021 |
5.1
|
A |
| 146 |
MH DAISEN
IMO 9997218
|
49,948 | 2025 |
5.1
|
A |
| 145 |
NORD MAJESTIC
IMO 9902835
|
49,998 | 2021 |
5.1
|
A |
| 148 |
SOLAR LAI FONG
IMO 9907809
|
49,358 | 2021 |
5.1
|
A |
| 149 |
AMWAJ
IMO 9917892
|
55,202 | 2023 |
5.1
|
A |
| 150 |
MINERVA ZEN
IMO 9410909
|
52,914 | 2009 |
5.2
|
A |
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.