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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.

Segment rank (2025)
#1,275 of 1,422 chemical tankers
CO₂ intensity
16.3 g CO₂/dwt·nm
vs segment average (9.4)
+73% higher
E
Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo
Sort 🌱 Greenest first 🔧 Least efficient first — retrofit candidates
Size (DWT)
All sizes < 25,000 DWT 25k – 60k DWT 60k – 100k DWT 100k – 200k DWT > 200,000 DWT
Year
2025 2024
1,451
vessels ranked
3.48
greenest (g CO₂/t·nm)
8.28
segment median
# Vessel Size (DWT) Built Carbon intensity — AER (g CO₂/dwt·nm) Grade
1251 SONGA JADE
IMO 9473925
 17,604 2009
15.3
E
1252 SARAJEVO
IMO 9477490
 11,321 2008
15.3
E
1253 APATYTH
IMO 9970739
 8,116 2024
15.3
E
1254 ANNELIESE ESSBERGER
IMO 9295426
 8,648 2005
15.3
E
1255 HARBOUR FEATURE
IMO 9473092
 16,909 2011
15.4
E
1256 NORMAN
IMO 9125279
 10,022 1996
15.4
E
1257 SLOMAN HERAKLES
IMO 9466726
 16,417 2012
15.4
E
1258 TASING SWAN
IMO 9403891
 11,336 2007
15.4
E
1259 ILHAN BAYRAK
IMO 9956434
 8,116 2023
15.4
E
1260 BESIKTAS ZEALAND
IMO 9431044
 18,289 2009
15.5
E
1261 KAPIDAG
IMO 9034731
 8,674 1992
15.5
E
1262 SYDSTRAUM
IMO 9854478
 10,191 2020
15.5
E
1263 K ONSET
IMO 9359595
 12,902 2006
15.6
E
1264 LILY PG
IMO 9823390
 7,330 2018
15.6
E
1265 BRENTHOLMEN
IMO 9436393
 16,850 2007
15.7
E
1266 CHRISTINA
IMO 9118496
 9,494 1996
15.8
E
1267 FERICEK
IMO 9125267
 10,106 1996
15.9
E
1268 SEA DUCK
IMO 9443839
 12,966 2009
15.9
E
1269 NEW RANGER
IMO 9328326
 12,951 2007
16.0
E
1270 ALANGOVA
IMO 9411927
 12,089 2008
16.0
E
1271 TORC
IMO 9544683
 13,214 2010
16.1
E
1272 TRANS EXETER
IMO 9314753
 9,437 2004
16.2
E
1273 ARSLAND
IMO 9395989
 16,791 2008
16.2
E
1274 LASCAUX
IMO 9405746
 11,674 2007
16.2
E
1275 NAVE ATRIA
IMO 9459060
 49,992 2012
16.3
E
1276 GIULIA IEVOLI
IMO 9284439
 13,776 2004
16.3
E
1277 MAZU XIAO
IMO 9503940
 7,732 2008
16.3
E
1278 KIVALLIQ W.
IMO 9187409
 13,671 2004
16.3
E
1279 GOLFSTRAUM
IMO 9390991
 9,595 2011
16.4
E
1280 BERGSTRAUM
IMO 9108740
 9,494 1996
16.5
E
1281 STAV POWER
IMO 9267560
 14,665 2005
16.5
E
1282 ORIENTAL ACACIA
IMO 9553048
 12,332 2011
16.5
E
1283 MENTOR
IMO 9340374
 13,013 2007
16.5
E
1284 SONGA TAURUS
IMO 9373644
 16,611 2009
16.5
E
1285 ANCHOR 18
IMO 9406714
 19,971 2009
16.5
E
1286 EVA BERGEN
IMO 9800013
 19,888 2018
16.5
E
1287 SILENDI
IMO 9508720
 19,964 2009
16.6
E
1288 TEQUILA
IMO 9345219
 13,016 2007
16.6
E
1289 BALTIC
IMO 9451226
 11,253 2020
16.6
E
1290 ORIS GRACE
IMO 9658422
 7,054 2012
16.6
E
1291 SONGA CRYSTAL
IMO 9378321
 12,927 2006
16.6
E
1292 GOLDEN ORCHID
IMO 9486178
 17,055 2009
16.6
E
1293 IVER ABILITY
IMO 9327504
 12,497 2006
16.6
E
1294 ASKARA
IMO 9431886
 10,744 2008
16.7
E
1295 SUNLIT
IMO 9340386
 13,065 2007
16.7
E
1296 TINA THERESA
IMO 9478298
 7,902 2009
16.7
E
1297 RYSTRAUM
IMO 9391000
 9,597 2012
16.7
E
1298 AMALIE ESSBERGER
IMO 9314777
 8,571 2005
16.8
E
1299 NQ TULIPA
IMO 9312406
 8,908 2004
16.8
E
1300 ELISALEX SCHULTE
IMO 9439876
 16,418 2011
16.8
E
Page 26 of 29 — 1,422 vessels
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Engine intelligence

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.

Emission-friendly engine ranking

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.