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.
CII band distribution
551 at D/E2,075 rated vessels · 250 of the D/E set dock within 12 months
Docking pipeline — D/E vessels per quarter
Windows estimated from the class-expiry docking model, not bookings.
Top eligible retrofit measures for this segment
| Measure | Eligible | CO₂ reduction | Capex band | Payback | Confidence |
|---|---|---|---|---|---|
| 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
Retrofit prospects — worst band first
| Vessel | Band | 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 |
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 597 |
FRONT CASTOR
IMO 9780251
|
111,088 | 2015 |
3.4
|
B |
| 596 |
CAPTAIN JOHN
IMO 9692832
|
113,876 | 2013 |
3.4
|
B |
| 601 |
PHAETHON
IMO 9412098
|
158,267 | 2009 |
3.4
|
B |
| 605 |
HAFNIA LARISSA
IMO 9800300
|
109,990 | 2019 |
3.5
|
B |
| 604 |
IONIC ARIADNE
IMO 9856555
|
112,007 | 2020 |
3.5
|
B |
| 606 |
NAFSIKA
IMO 9913511
|
112,051 | 2022 |
3.5
|
B |
| 607 |
TORM GITTE
IMO 9426312
|
119,456 | 2010 |
3.5
|
B |
| 610 |
PORTINARI
IMO 9547714
|
115,727 | 2008 |
3.5
|
B |
| 609 |
SFL THELON
IMO 9593000
|
159,500 | 2015 |
3.5
|
B |
| 611 |
NAVIG8 PRESTIGE JKB
IMO 9831309
|
111,000 | 2015 |
3.5
|
B |
| 608 |
MARE SICULUM
IMO 9457892
|
158,466 | 2011 |
3.5
|
B |
| 616 |
DELTA IOS
IMO 9406685
|
157,484 | 2009 |
3.5
|
B |
| 613 |
PACIFIC EMERALD
IMO 9893022
|
113,306 | 2021 |
3.5
|
B |
| 612 |
PEACE VICTORIA
IMO 9771028
|
77,378 | 2019 |
3.5
|
B |
| 615 |
HAIFENG
IMO 9792840
|
109,898 | 2018 |
3.5
|
B |
| 614 |
EAGLE BINTULU
IMO 9795074
|
113,400 | 2015 |
3.5
|
B |
| 617 |
CLEAROCEAN APOLLON
IMO 9850707
|
113,252 | 2019 |
3.5
|
B |
| 619 |
TORM GWENDOLYN
IMO 9428982
|
119,456 | 2010 |
3.5
|
B |
| 618 |
STI PARK
IMO 9690793
|
109,999 | 2013 |
3.5
|
B |
| 621 |
ORPHEAS
IMO 9318149
|
167,282 | 2007 |
3.5
|
B |
| 620 |
SEASENATOR
IMO 9304368
|
105,715 | 2003 |
3.5
|
B |
| 623 |
ALMI VOYAGER
IMO 9579585
|
157,638 | 2014 |
3.5
|
B |
| 622 |
ARCTIC
IMO 9315173
|
163,216 | 2004 |
3.5
|
B |
| 627 |
STI GUIDE
IMO 9717113
|
109,999 | 2016 |
3.5
|
B |
| 626 |
CLEAROCEAN AJAX
IMO 9850692
|
113,252 | 2019 |
3.5
|
B |
| 625 |
LEONTIOS H
IMO 9724336
|
113,611 | 2016 |
3.5
|
B |
| 624 |
SPARTO
IMO 9865116
|
115,468 | 2020 |
3.5
|
B |
| 630 |
SAPPHIRA
IMO 9336983
|
149,876 | 2008 |
3.5
|
B |
| 629 |
FEZZAN
IMO 9888730
|
114,243 | 2021 |
3.5
|
B |
| 631 |
CARIBBEAN VOYAGER
IMO 9857860
|
115,165 | 2018 |
3.5
|
B |
| 628 |
ADVANTAGE SWEET
IMO 9587192
|
159,058 | 2012 |
3.5
|
B |
| 632 |
AL RUWAIS
IMO 9828405
|
114,695 | 2021 |
3.5
|
B |
| 636 |
FRONT OCELOT
IMO 9726580
|
109,900 | 2016 |
3.5
|
B |
| 635 |
OTTOMAN INTEGRITY
IMO 9530618
|
149,999 | 2011 |
3.5
|
B |
| 634 |
SEATRUST
IMO 9979993
|
115,000 | 2022 |
3.5
|
B |
| 633 |
SPYROS K
IMO 9565948
|
157,648 | 2009 |
3.5
|
B |
| 638 |
NEW VISION
IMO 9804459
|
157,617 | 2018 |
3.5
|
B |
| 637 |
ELANDRA SOUND
IMO 9821706
|
115,666 | 2018 |
3.5
|
B |
| 643 |
STRESA
IMO 9912866
|
115,335 | 2020 |
3.5
|
B |
| 642 |
ALFIOS I
IMO 9923009
|
115,351 | 2022 |
3.5
|
B |
| 641 |
SEAODYSSEY
IMO 9740419
|
113,176 | 2013 |
3.5
|
B |
| 640 |
NAVIG8 PRECISION
IMO 9831294
|
109,994 | 2015 |
3.5
|
B |
| 639 |
SEA DRAGON
IMO 9903918
|
114,217 | 2019 |
3.5
|
B |
| 646 |
EAGLE KUANTAN
IMO 9417012
|
107,481 | 2010 |
3.5
|
B |
| 645 |
SEABORN
IMO 9980007
|
115,000 | 2022 |
3.5
|
B |
| 644 |
KYRAKATINGO
IMO 9779965
|
113,563 | 2017 |
3.5
|
B |
| 650 |
MINERVA BALTICA
IMO 9728241
|
113,172 | 2015 |
3.5
|
B |
| 649 |
ARETEA
IMO 9711456
|
113,969 | 2015 |
3.5
|
B |
| 648 |
HAFNIA LOIRE
IMO 9941697
|
109,999 | 2023 |
3.5
|
B |
| 647 |
SANTHIA
IMO 9978705
|
115,062 | 2022 |
3.5
|
B |
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.
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.