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Oil 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)
#1,532 of 1,651 oil tankers
CO₂ intensity
10.8 g CO₂/dwt·nm
vs segment average (5.18)
+108% 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

551 at D/E
A 411B 557C 556D 354E 197

2,075 rated vessels · 250 of the D/E set dock within 12 months

Docking pipeline — D/E vessels per quarter

51
Q4
64
'27 Q1
52
'27 Q2
27
'27 Q3
39
'27 Q4
54
'28 Q1
43
'28 Q2
30
'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 1,790 5–10% €400k–1,200k — vendor claim
Bulbous bow reprofiling 1,674 2–6% €300k–900k — vendor claim
Turbocharger cut-out 1,267 1–3% €80k–250k — vendor claim
Methanol dual-fuel conversion 1,163 5–15% €8,000k–20,000k — vendor claim
LNG dual-fuel conversion 1,129 15–25% €15,000k–35,000k — vendor claim
Rotor sails (per unit) 1,052 route-dependent €1,500k–3,500k — vendor claim

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

Retrofit opportunity in this segment

392
D/E vessels with at least one eligible measure
€1,483–3,536M
capex range, top measure per vessel (392 of 392 with computable scaling)
0.25–0.46 Mt
annual CO₂ reduction available (vendor-claimed ranges × reported emissions)

Retrofit prospects — worst band first

VesselBand Age Drop year
PAULA GLORY · 25-60k E 3y 2026
OLYMPIC TROPHY · >200k E 16y 2026
SEALING · 25-60k E 23y 2026
EOS T · <25k E 20y 2026
HERCULES SUN · <25k E 4y 2026
See all 2,075 rated oil 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
1,685
vessels ranked
1.32
greenest (g CO₂/dwt·nm)
4.01
segment median
# Vessel Size (DWT) Built Carbon intensity — AER (g CO₂/dwt·nm) Grade
1501 FURE VEN
IMO 9983102
 17,945 2025
9.5
E
1502 WATSON
IMO 9858759
 34,746 2019
9.6
E
1503 ARDBEG
IMO 1055428
 18,467 2025
9.6
E
1504 PIONEER
IMO 9260079
 40,055 2001
9.6
E
1505 GOLDEN BANYAN
IMO 1055844
 18,444 2025
9.7
E
1506 FURE VISKAR
IMO 9980320
 17,953 2024
9.7
E
1507 FURE VYL
IMO 9983956
 17,952 2024
9.8
E
1508 ASENA
IMO 9274628
 37,188 2004
9.8
E
1509 WHITE ALLEGRA
IMO 9973353
 17,779 2023
9.8
E
1510 OTTOMANA
IMO 9299214
 27,300 2006
9.8
E
1511 ANWAAR AL NASER
IMO 9313450
 29,006 2006
9.8
E
1512 DAN CISNE
IMO 9513440
 59,335 2011
9.9
E
1513 SOUTHERN OWL
IMO 9773143
 26,057 2016
10.0
E
1514 XT PROSPERITY
IMO 9989560
 13,185 2024
10.0
E
1515 ANWAAR AL KHALIJ
IMO 9313424
 29,006 2005
10.1
E
1516 STI MERAUX
IMO 9681118
 50,300 2012
10.1
E
1517 SEASPRAT
IMO 9380477
 40,598 2007
10.1
E
1518 CASTILLO DE ARTEAGA
IMO 9871012
 37,430 2019
10.2
E
1519 NEW LEGEND
IMO 9230505
 159,435 2002
10.3
E
1520 ASTANA
IMO 9904053
 13,823 2022
10.3
E
1521 DAN SABIA
IMO 9513438
 59,317 2012
10.3
E
1522 STI HAMMERSMITH
IMO 9706463
 38,734 2015
10.4
E
1523 OSTRO I
IMO 1021697
 18,653 2025
10.4
E
1524 STARLIGHT II
IMO 9377652
 37,847 2007
10.5
E
1525 SEATROUT
IMO 9352303
 40,600 2006
10.6
E
1526 STEN SUOMI
IMO 9378723
 16,619 2008
10.6
E
1527 YANBU
IMO 9376816
 38,374 2008
10.6
E
1528 STI COMANDANTE
IMO 9686857
 38,734 2014
10.6
E
1529 PUTUOSHAN
IMO 9286542
 19,822 2004
10.6
E
1530 BLUE SKY
IMO 9413016
 105,491 2006
10.6
E
1531 NATIG ALIYEV
IMO 9194000
 19,800 2002
10.7
E
1532 DURGA
IMO 9260005
 39,634 2003
10.8
E
1533 SEAPIKE
IMO 9423449
 43,550 2009
10.9
E
1534 ATLANTIC ASPHALT
IMO 9798428
 17,764 2017
11.0
E
1535 SEACONGER
IMO 9352298
 32,200 2005
11.1
E
1536 WONDER MIMOSA
IMO 9312901
 37,620 2006
11.1
E
1537 GOLDEN CEDAR
IMO 1055856
 18,417 2025
11.4
E
1538 HAI GONG YOU 306
IMO 9150614
 16,376 1999
11.5
E
1539 SARACENA
IMO 9334325
 20,500 2007
11.5
E
1540 RINELLA M
IMO 9351529
 40,441 2006
11.7
E
1541 STEN BERGEN
IMO 9407988
 16,655 2009
11.9
E
1542 KUBA
IMO 9383089
 8,525 2007
12.0
E
1543 T RIGEL
IMO 9585039
 20,919 2007
12.1
E
1544 DA MING SHAN
IMO 9779745
 12,980 2016
12.2
E
1545 AGNES PG
IMO 1018858
 10,795 2025
12.2
E
1546 STEN BOTHNIA
IMO 9378735
 16,611 2008
12.3
E
1547 LIDER KEREM
IMO 9394076
 13,330 2025
12.4
E
1548 STEN FRIGG
IMO 9407976
 16,587 2009
12.6
E
1549 ANWAAR AFRIQYA
IMO 9275268
 34,656 2004
12.6
E
1550 HANUMAN
IMO 9295048
 34,620 2004
12.7
E
Page 31 of 34 — 1,651 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.