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 2024. 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 |
|---|---|---|---|---|---|
| 501 |
KRITI KING
IMO 9887255
|
158,005 | 2021 |
3.2
|
B |
| 500 |
BOUBOULINA
IMO 9298753
|
163,759 | 2006 |
3.2
|
B |
| 504 |
FRONT SAVANNAH
IMO 9831828
|
157,270 | 2017 |
3.2
|
B |
| 503 |
MARAN PYTHIA
IMO 9402902
|
158,266 | 2009 |
3.2
|
B |
| 505 |
YUAN HE WAN
IMO 9845996
|
113,642 | 2020 |
3.2
|
B |
| 510 |
T.SADBERK
IMO 9804136
|
157,453 | 2017 |
3.2
|
B |
| 509 |
SEACROSS
IMO 9297890
|
163,292 | 2006 |
3.2
|
B |
| 508 |
ELANDRA SOUND
IMO 9821706
|
115,666 | 2018 |
3.2
|
B |
| 507 |
ACHILLEAS
IMO 9458494
|
157,883 | 2007 |
3.2
|
B |
| 506 |
SONANGOL CABINDA
IMO 9575589
|
157,748 | 2010 |
3.2
|
B |
| 513 |
SIKINOS I
IMO 9800269
|
157,007 | 2018 |
3.2
|
B |
| 512 |
HAFNIA LARISSA
IMO 9800300
|
109,990 | 2019 |
3.2
|
B |
| 511 |
DF MYSTRAS
IMO 9941702
|
109,999 | 2023 |
3.2
|
B |
| 516 |
AQUASURAZO
IMO 9785720
|
113,032 | 2017 |
3.2
|
B |
| 515 |
SEALEGEND
IMO 9906568
|
115,648 | 2020 |
3.2
|
B |
| 514 |
EAGLE HALIFAX
IMO 9453987
|
114,062 | 2010 |
3.2
|
B |
| 517 |
RED MOON
IMO 9590307
|
160,024 | 2012 |
3.2
|
B |
| 519 |
ALFIOS I
IMO 9923009
|
115,351 | 2022 |
3.2
|
B |
| 518 |
OTTOMAN INTEGRITY
IMO 9530618
|
149,999 | 2011 |
3.2
|
B |
| 524 |
PARTHENON TS
IMO 9724348
|
113,554 | 2016 |
3.2
|
B |
| 523 |
NAFSIKA
IMO 9913511
|
112,051 | 2022 |
3.2
|
B |
| 525 |
ELYTIS
IMO 9946702
|
113,839 | 2024 |
3.2
|
B |
| 522 |
MILITOS
IMO 9607435
|
164,751 | 2012 |
3.2
|
B |
| 521 |
DELTA POSEIDON
IMO 9468671
|
157,380 | 2011 |
3.2
|
B |
| 520 |
PROTEUS PHILIPPA
IMO 9923425
|
109,999 | 2022 |
3.2
|
B |
| 526 |
SWORD
IMO 9783631
|
104,027 | 2018 |
3.2
|
B |
| 530 |
ADVANTAGE LOVE
IMO 9708552
|
109,999 | 2015 |
3.2
|
B |
| 529 |
PEGASUS STAR
IMO 9891672
|
116,120 | 2021 |
3.2
|
B |
| 528 |
DELTA SKY
IMO 9410181
|
166,092 | 2009 |
3.2
|
B |
| 527 |
NORDMARLIN
IMO 9779989
|
113,959 | 2017 |
3.2
|
B |
| 531 |
OSLO TS
IMO 9737383
|
112,949 | 2017 |
3.3
|
B |
| 533 |
EAGLE BARCELONA
IMO 9795048
|
113,400 | 2015 |
3.3
|
B |
| 535 |
BREEZE
IMO 9809356
|
156,682 | 2016 |
3.3
|
B |
| 534 |
HAFNIA LANGUEDOC
IMO 9941685
|
109,999 | 2023 |
3.3
|
B |
| 532 |
PROTEUS STEPHANIE
IMO 9914694
|
109,999 | 2022 |
3.3
|
B |
| 536 |
DF MONTMARTE
IMO 9941714
|
109,999 | 2023 |
3.3
|
B |
| 537 |
TP AFFINITY
IMO 9645401
|
114,070 | 2016 |
3.3
|
B |
| 538 |
THORNBURY
IMO 9910533
|
112,066 | 2022 |
3.3
|
B |
| 542 |
JILL GLORY
IMO 9959917
|
115,000 | 2023 |
3.3
|
B |
| 541 |
KINYRAS
IMO 9320714
|
166,468 | 2007 |
3.3
|
B |
| 540 |
LORAX
IMO 9903413
|
109,990 | 2022 |
3.3
|
B |
| 539 |
VILAMOURA
IMO 9529293
|
158,621 | 2011 |
3.3
|
B |
| 545 |
MARLIN LORETO
IMO 9823558
|
114,823 | 2021 |
3.3
|
B |
| 544 |
COPPER SPIRIT
IMO 9427639
|
156,827 | 2006 |
3.3
|
B |
| 543 |
DELTA COMMANDER
IMO 9418157
|
157,477 | 2010 |
3.3
|
B |
| 549 |
IKARA
IMO 9321718
|
158,920 | 2006 |
3.3
|
B |
| 548 |
MALIBU
IMO 9776731
|
158,692 | 2017 |
3.3
|
B |
| 547 |
YAMATO SPIRIT
IMO 9414503
|
107,617 | 2008 |
3.3
|
B |
| 546 |
SEA TURTLE
IMO 9886718
|
114,085 | 2021 |
3.3
|
B |
| 550 |
STI ORCHARD
IMO 9690834
|
109,999 | 2013 |
3.3
|
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 2024 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.