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Chemical Tanker Emissions & Retrofit Radar

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)
#1,419 of 1,422 chemical tankers
CO₂ intensity
21.8 g CO₂/dwt·nm
vs segment average (9.4)
+132% higher
E
Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo

CII band distribution

415 at D/E
A 388B 447C 448D 293E 122

1,698 rated vessels · 169 of the D/E set dock within 12 months

Docking pipeline — D/E vessels per quarter

21
Q4
46
'27 Q1
34
'27 Q2
29
'27 Q3
36
'27 Q4
31
'28 Q1
30
'28 Q2
23
'28 Q3

Windows estimated from the class-expiry docking model, not bookings.

Top eligible retrofit measures for this segment

MeasureEligible CO₂ reductionCapex band PaybackConfidence
Propeller redesign / replacement 1,272 5–10% €400k–1,200k — vendor claim
Turbocharger cut-out 1,234 1–3% €80k–250k — vendor claim
Rotor sails (per unit) 1,077 route-dependent €1,500k–3,500k — vendor claim
Suction wing sails (per unit) 1,077 route-dependent €1,000k–2,500k — vendor claim
Bulbous bow reprofiling 915 2–6% €300k–900k — vendor claim
Methanol dual-fuel conversion 686 5–15% €8,000k–20,000k — vendor claim

Capex bands are indicative vendor/literature priors. Payback appears once price parameters are configured.

Retrofit opportunity in this segment

278
D/E vessels with at least one eligible measure
€647–1,598M
capex range, top measure per vessel (278 of 278 with computable scaling)
0.09–0.19 Mt
annual CO₂ reduction available (vendor-claimed ranges × reported emissions)

Retrofit prospects — worst band first

VesselBand Age Drop year
MEHTAP · 25-60k E 18y 2026
MARIA IMMACULATA · <25k E 18y 2026
HARBOUR PROGRESS · <25k E 16y 2026
HERCULES SKY · <25k E 5y 2026
NAVE ATRIA · 25-60k E 14y 2026
See all 1,698 rated chemical tankers with exposure and dock windows. Sign in →
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/dwt·nm)
8.28
segment median
# Vessel Size (DWT) Built Carbon intensity — AER (g CO₂/dwt·nm) Grade
1401 ESSEX STAR
IMO 9348297
 16,744 2007
20.6
E
1402 MED TUNCER
IMO 9830599
 8,228 2019
20.7
E
1403 CATHY THERESA
IMO 9478315
 7,826 2011
20.7
E
1404 GENNARO IEVOLI
IMO 9268631
 12,004 2004
20.7
E
1405 GTM GERMANY
IMO 9405320
 11,796 2008
20.8
E
1406 HYDRA
IMO 9837341
 7,870 2019
20.9
E
1407 NORMA
IMO 9870666
 7,399 2020
21.0
E
1408 MED BALTIC
IMO 9462304
 8,280 2011
21.0
E
1409 MRC MINA
IMO 9464285
 7,718 2009
21.0
E
1410 BLUE BIRD
IMO 9527764
 9,938 2011
21.0
E
1411 ROLAND ESSBERGER
IMO 9504217
 9,124 2013
21.0
E
1412 DANTE A
IMO 9361029
 12,100 2008
21.2
E
1413 SONGA ATLANTIC
IMO 9447328
 17,999 2010
21.3
E
1414 LADY ELA
IMO 9511442
 7,668 2009
21.4
E
1415 BOTHNIA
IMO 9485356
 8,985 2013
21.7
E
1416 MED ARCTIC
IMO 9410545
 8,280 2009
21.7
E
1417 SWAN BISCAY
IMO 9466532
 6,711 2021
21.7
E
1418 MARY A
IMO 9321433
 8,036 2007
21.7
E
1419 CORAL ESSBERGER
IMO 9504205
 9,118 2012
21.8
E
1420 MED BLUE JAY
IMO 9544346
 8,231 2021
21.8
E
1421 MAYOURY
IMO 9777541
 9,194 2017
22.0
E
1422 MIMMO IEVOLI
IMO 9147746
 9,554 1998
22.1
E
Page 29 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.