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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)
#633 of 1,651 oil tankers
CO₂ intensity
3.5 g CO₂/dwt·nm
vs segment average (5.18)
-33% greener
B
Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo

CII band distribution

552 at D/E
A 412B 557C 554D 355E 197

2,075 rated vessels · 266 of the D/E set dock within 12 months

Docking pipeline — D/E vessels per quarter

39
Q3
49
Q4
65
'27 Q1
52
'27 Q2
27
'27 Q3
40
'27 Q4
48
'28 Q1
42
'28 Q2

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 1,872 5–10% €400k–1,200k — vendor claim
Bulbous bow reprofiling 1,753 2–6% €300k–900k — vendor claim
Methanol dual-fuel conversion 1,191 5–15% €8,000k–20,000k — vendor claim
LNG dual-fuel conversion 1,157 15–25% €15,000k–35,000k — vendor claim
Turbocharger cut-out 858 1–3% €80k–250k — vendor claim
Shaft generator / PTO 776 3–6% €500–1,500/kW — vendor claim

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

Retrofit opportunity in this segment

386
D/E vessels with at least one eligible measure
€1,607–3,828M
capex range, top measure per vessel (386 of 386 with computable scaling)
0.25–0.47 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
597 PHAETHON
IMO 9412098
 158,267 2009
3.4
B
596 SEACHARM
IMO 9773765
 112,179 2018
3.4
B
601 MARAN PLATO
IMO 9399507
 158,267 2009
3.4
B
605 IONIC ARIADNE
IMO 9856555
 112,007 2020
3.5
B
604 TORM GITTE
IMO 9426312
 119,456 2010
3.5
B
606 HAFNIA LARISSA
IMO 9800300
 109,990 2019
3.5
B
607 NAFSIKA
IMO 9913511
 112,051 2022
3.5
B
610 SFL THELON
IMO 9593000
 159,500 2010
3.5
B
609 PACIFIC EMERALD
IMO 9893022
 113,306 2021
3.5
B
611 EAGLE BINTULU
IMO 9795074
 113,400 2019
3.5
B
608 HAIFENG
IMO 9792840
 109,898 2018
3.5
B
616 PEACE VICTORIA
IMO 9771028
 77,378 2019
3.5
B
613 PORTINARI
IMO 9547714
 115,727 2019
3.5
B
612 MARE SICULUM
IMO 9457892
 158,466 2011
3.5
B
615 NAVIG8 PRESTIGE JKB
IMO 9831309
 111,000 2019
3.5
B
614 DELTA IOS
IMO 9406685
 157,484 2009
3.5
B
617 SEASENATOR
IMO 9304368
 105,715 2003
3.5
B
619 STI PARK
IMO 9690793
 109,999 2014
3.5
B
618 CLEAROCEAN APOLLON
IMO 9850707
 113,252 2019
3.5
B
621 ORPHEAS
IMO 9318149
 167,282 2007
3.5
B
620 TORM GWENDOLYN
IMO 9428982
 119,456 2010
3.5
B
623 ARCTIC
IMO 9315173
 163,216 2007
3.5
B
622 CLEAROCEAN AJAX
IMO 9850692
 113,252 2019
3.5
B
627 STI GUIDE
IMO 9717113
 109,999 2016
3.5
B
626 SPARTO
IMO 9865116
 115,468 2020
3.5
B
625 LEONTIOS H
IMO 9724336
 113,611 2016
3.5
B
624 ALMI VOYAGER
IMO 9579585
 157,638 2014
3.5
B
630 FEZZAN
IMO 9888730
 114,243 2021
3.5
B
629 AL RUWAIS
IMO 9828405
 114,695 2021
3.5
B
631 SAPPHIRA
IMO 9336983
 149,876 2008
3.5
B
628 CARIBBEAN VOYAGER
IMO 9857860
 115,165 2020
3.5
B
632 ADVANTAGE SWEET
IMO 9587192
 159,058 2012
3.5
B
635 OTTOMAN INTEGRITY
IMO 9530618
 149,999 2011
3.5
B
634 FRONT OCELOT
IMO 9726580
 109,900 2016
3.5
B
633 SPYROS K
IMO 9565948
 157,647 2009
3.5
B
636 NAVIG8 PRECISION
IMO 9831294
 109,994 2018
3.5
B
642 SEAODYSSEY
IMO 9740419
 113,176 2017
3.5
B
641 ALFIOS I
IMO 9923009
 115,351 2022
3.5
B
640 SEA DRAGON
IMO 9903918
 114,217 2019
3.5
B
637 ELANDRA SOUND
IMO 9821706
 115,666 2018
3.5
B
639 NEW VISION
IMO 9804459
 157,617 2018
3.5
B
638 STRESA
IMO 9912866
 115,335 2022
3.5
B
645 EAGLE KUANTAN
IMO 9417012
 107,481 2010
3.5
B
644 KYRAKATINGO
IMO 9779965
 113,563 2017
3.5
B
643 SEATRUST
IMO 9979993
 114,449 2022
3.5
B
650 ARETEA
IMO 9711456
 113,969 2015
3.5
B
649 MINERVA BALTICA
IMO 9728241
 113,172 2018
3.5
B
648 SANTHIA
IMO 9978705
 115,062 2024
3.5
B
647 SEABORN
IMO 9980007
 114,437 2022
3.5
B
646 HAFNIA LOIRE
IMO 9941697
 109,999 2023
3.5
B
Page 13 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.