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 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 |
|---|---|---|---|---|---|
| 1101 |
STEN SKAGEN
IMO 9460239
|
18,531 | 2009 |
13.9
|
E |
| 1102 |
TRANS IBERIA
IMO 9170597
|
19,733 | 1999 |
13.9
|
E |
| 1103 |
GOLDEN CURL
IMO 9348522
|
17,088 | 2007 |
13.9
|
E |
| 1104 |
IMERA
IMO 9458066
|
14,391 | 2011 |
14.0
|
E |
| 1105 |
UACC MANAMA
IMO 9458822
|
45,612 | 2010 |
14.0
|
E |
| 1106 |
SARAJEVO
IMO 9477490
|
11,321 | 2008 |
14.0
|
E |
| 1107 |
EVA MANILA
IMO 9918602
|
19,860 | 2021 |
14.0
|
E |
| 1108 |
KITIKMEOT W.
IMO 9421219
|
19,983 | 2010 |
14.0
|
E |
| 1109 |
TRANS SEA
IMO 9956927
|
12,598 | 2023 |
14.0
|
E |
| 1110 |
SLOMAN HERA
IMO 9466714
|
16,426 | 2012 |
14.0
|
E |
| 1111 |
TRANS ADRIATIC
IMO 9263928
|
12,503 | 2002 |
14.1
|
E |
| 1112 |
EVINCO
IMO 9308546
|
19,999 | 2005 |
14.1
|
E |
| 1113 |
BESIKTAS ZEALAND
IMO 9431044
|
18,289 | 2009 |
14.1
|
E |
| 1114 |
TATLISU
IMO 9282364
|
8,521 | 2003 |
14.1
|
E |
| 1115 |
NEW SPIRIT
IMO 9337872
|
12,970 | 2008 |
14.1
|
E |
| 1116 |
SONGA COSMOS
IMO 9457024
|
25,130 | 2010 |
14.1
|
E |
| 1117 |
STOLT AGUILA
IMO 9391983
|
12,574 | 2009 |
14.1
|
E |
| 1118 |
JUTLANDIA SWAN
IMO 9736638
|
12,479 | 2015 |
14.1
|
E |
| 1119 |
ARAL
IMO 8125454
|
8,915 | 1982 |
14.1
|
E |
| 1120 |
ORIENTAL HIBISCUS
IMO 9908334
|
16,223 | 2021 |
14.2
|
E |
| 1121 |
SUNLIT
IMO 9340386
|
13,065 | 2007 |
14.2
|
E |
| 1122 |
OWL 5
IMO 9439357
|
13,062 | 2009 |
14.2
|
E |
| 1123 |
EMMY SCHULTE
IMO 9394519
|
16,669 | 2009 |
14.3
|
E |
| 1124 |
GULLFJELLET
IMO 9724439
|
19,975 | 2015 |
14.3
|
E |
| 1125 |
ARSLAND
IMO 9395989
|
16,791 | 2008 |
14.4
|
E |
| 1126 |
SCORPIUS
IMO 9318228
|
11,249 | 2006 |
14.4
|
E |
| 1127 |
SALTSTRAUM
IMO 9854466
|
10,585 | 2020 |
14.4
|
E |
| 1128 |
EVA GOLD
IMO 9888132
|
19,894 | 2022 |
14.4
|
E |
| 1129 |
ERIN SCHULTE
IMO 9439814
|
16,716 | 2009 |
14.4
|
E |
| 1130 |
GINGA CARACAL
IMO 9426300
|
25,876 | 2009 |
14.5
|
E |
| 1131 |
HARBOUR FEATURE
IMO 9473092
|
16,909 | 2011 |
14.5
|
E |
| 1132 |
K INSET
IMO 9311634
|
12,956 | 2005 |
14.5
|
E |
| 1133 |
WICKY SPIRIT
IMO 9404388
|
13,945 | 2006 |
14.6
|
E |
| 1134 |
HARBOUR FOUNTAIN
IMO 9473107
|
16,929 | 2011 |
14.6
|
E |
| 1135 |
LAGERTHA
IMO 9410143
|
19,999 | 2006 |
14.6
|
E |
| 1136 |
SEN ARCHE
IMO 9443061
|
8,956 | 2008 |
14.6
|
E |
| 1137 |
BROMLEY
IMO 9460502
|
17,568 | 2008 |
14.6
|
E |
| 1138 |
EVA HANSA
IMO 9985980
|
19,944 | 2023 |
14.6
|
E |
| 1139 |
OWL 1
IMO 9439369
|
13,053 | 2009 |
14.6
|
E |
| 1140 |
EVA SCHULTE
IMO 9439826
|
16,621 | 2010 |
14.6
|
E |
| 1141 |
BALTIC ICE
IMO 9327401
|
37,100 | 2006 |
14.7
|
E |
| 1142 |
SUNFLYTE
IMO 9228813
|
37,271 | 2000 |
14.7
|
E |
| 1143 |
CHEMICAL MARINER
IMO 9558971
|
14,301 | 2010 |
14.7
|
E |
| 1144 |
RITA IEVOLI
IMO 9846471
|
15,882 | 2023 |
14.7
|
E |
| 1145 |
LILY PG
IMO 9823390
|
7,330 | 2018 |
14.7
|
E |
| 1146 |
ATLANTIC WIND
IMO 9341316
|
15,652 | 2007 |
14.8
|
E |
| 1147 |
ORIS TRINITY
IMO 9438169
|
13,121 | 2009 |
14.8
|
E |
| 1148 |
SCOT STUTTGART
IMO 9274549
|
8,184 | 2006 |
14.9
|
E |
| 1149 |
AETHALIA
IMO 9373230
|
19,992 | 2008 |
14.9
|
E |
| 1150 |
VIKSTRAUM
IMO 9829796
|
10,501 | 2019 |
14.9
|
E |
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.