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 |
|---|---|---|---|---|---|
| 551 |
RAVA
IMO 9796743
|
114,385 | 2017 |
3.4
|
B |
| 553 |
AL BATEEN
IMO 9828376
|
114,637 | 2020 |
3.4
|
B |
| 552 |
NEWBURY
IMO 9920497
|
112,095 | 2022 |
3.4
|
B |
| 557 |
TORM KIARA
IMO 9701554
|
114,270 | 2015 |
3.4
|
B |
| 556 |
ITHAKI DF
IMO 9953494
|
114,598 | 2024 |
3.4
|
B |
| 555 |
NEW AMORGOS
IMO 9370836
|
107,510 | 2005 |
3.4
|
B |
| 554 |
ELANDRA SWIFT
IMO 9945306
|
109,999 | 2024 |
3.4
|
B |
| 558 |
SEA VOYAGER
IMO 9408310
|
107,506 | 2006 |
3.4
|
B |
| 562 |
NOLDE
IMO 9787924
|
115,024 | 2015 |
3.4
|
B |
| 561 |
SONANGOL NAMIBE
IMO 9325049
|
158,425 | 2004 |
3.4
|
B |
| 560 |
FRONT FUSION
IMO 9887803
|
109,899 | 2021 |
3.4
|
B |
| 559 |
AGIOS GERASIMOS
IMO 9693056
|
109,999 | 2013 |
3.4
|
B |
| 563 |
SEAWAYS COLORADO
IMO 9594767
|
158,614 | 2010 |
3.4
|
B |
| 565 |
PROMETHEUS LIGHT
IMO 9801976
|
114,601 | 2019 |
3.4
|
B |
| 564 |
OCEAN BLUE
IMO 9955997
|
113,385 | 2021 |
3.4
|
B |
| 571 |
ARDAS I
IMO 9930624
|
115,335 | 2023 |
3.4
|
B |
| 570 |
OSLO TS
IMO 9737383
|
112,949 | 2017 |
3.4
|
B |
| 569 |
SEAGALAXY
IMO 9847231
|
114,426 | 2015 |
3.4
|
B |
| 568 |
CAP FELIX
IMO 9380738
|
158,765 | 2008 |
3.4
|
B |
| 567 |
RELIABLE WARRIOR
IMO 9753557
|
159,058 | 2014 |
3.4
|
B |
| 566 |
ON PRECIOUS
IMO 9893216
|
114,623 | 2021 |
3.4
|
B |
| 572 |
STI SLOANE
IMO 9690808
|
114,000 | 2013 |
3.4
|
B |
| 576 |
ANTARCTIC
IMO 9315185
|
163,216 | 2007 |
3.4
|
B |
| 578 |
PISSIOTIS
IMO 9509023
|
149,998 | 2006 |
3.4
|
B |
| 574 |
STI MADISON
IMO 9688831
|
109,999 | 2013 |
3.4
|
B |
| 573 |
FLAVIN
IMO 9787912
|
115,125 | 2015 |
3.4
|
B |
| 577 |
TATAKI
IMO 9410210
|
162,187 | 2006 |
3.4
|
B |
| 575 |
FRONT ALTAIR
IMO 9745902
|
109,894 | 2014 |
3.4
|
B |
| 580 |
HAFNIA TRITON
IMO 9800336
|
109,990 | 2019 |
3.4
|
B |
| 579 |
METRO AEGEAN
IMO 9973640
|
114,934 | 2024 |
3.4
|
B |
| 581 |
DELTA SUPREME
IMO 9585895
|
159,031 | 2012 |
3.4
|
B |
| 582 |
RIVERA
IMO 9777943
|
113,000 | 2015 |
3.4
|
B |
| 583 |
YAMATO SPIRIT
IMO 9414503
|
107,617 | 2008 |
3.4
|
B |
| 587 |
STI ROSE
IMO 9696682
|
109,999 | 2015 |
3.4
|
B |
| 586 |
MARAN PYTHIA
IMO 9402902
|
158,266 | 2009 |
3.4
|
B |
| 585 |
IONIC ARTEMIS
IMO 9426441
|
107,605 | 2009 |
3.4
|
B |
| 584 |
ESTRELLA
IMO 9696761
|
106,282 | 2014 |
3.4
|
B |
| 589 |
DELTA HARMONY
IMO 9408463
|
157,410 | 2009 |
3.4
|
B |
| 592 |
VST ELECTRA
IMO 9784611
|
109,986 | 2017 |
3.4
|
B |
| 594 |
LOVELY LADY
IMO 9960978
|
115,322 | 2023 |
3.4
|
B |
| 591 |
MARITIME GLORY
IMO 9863429
|
114,122 | 2021 |
3.4
|
B |
| 595 |
PARTHENON TS
IMO 9724348
|
113,554 | 2016 |
3.4
|
B |
| 590 |
PROMETHEUS ENERGY
IMO 9801988
|
114,459 | 2019 |
3.4
|
B |
| 588 |
SEASCOUT
IMO 9997957
|
113,814 | 2025 |
3.4
|
B |
| 593 |
YUAN TANG WAN
IMO 9846005
|
113,684 | 2020 |
3.4
|
B |
| 600 |
PHAETHON
IMO 9412098
|
158,267 | 2009 |
3.4
|
B |
| 599 |
CAPTAIN JOHN
IMO 9692832
|
113,876 | 2013 |
3.4
|
B |
| 598 |
FRONT CASTOR
IMO 9780251
|
111,088 | 2015 |
3.4
|
B |
| 597 |
MARAN PLATO
IMO 9399507
|
158,267 | 2009 |
3.4
|
B |
| 596 |
GEMINI SUN
IMO 9343340
|
115,577 | 2008 |
3.4
|
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.