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 · 279 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 | 1,834 | 5–10% | €400k–1,200k | — | vendor claim |
| Bulbous bow reprofiling | 1,718 | 2–6% | €300k–900k | — | vendor claim |
| Turbocharger cut-out | 1,320 | 1–3% | €80k–250k | — | vendor claim |
| Methanol dual-fuel conversion | 1,185 | 5–15% | €8,000k–20,000k | — | vendor claim |
| LNG dual-fuel conversion | 1,151 | 15–25% | €15,000k–35,000k | — | vendor claim |
| Rotor sails (per unit) | 1,118 | 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 |
PEGASUS STAR
IMO 9891672
|
116,120 | 2021 |
3.3
|
B |
| 500 |
ALMI EXPLORER
IMO 9579547
|
157,787 | 2013 |
3.3
|
B |
| 503 |
PROTEUS IWONA
IMO 9914670
|
109,992 | 2022 |
3.3
|
B |
| 511 |
BEIJING SPIRIT
IMO 9418597
|
156,493 | 2010 |
3.3
|
B |
| 510 |
FRONT CAPELLA
IMO 9790995
|
111,000 | 2015 |
3.3
|
B |
| 509 |
ANDROMEDA
IMO 9943061
|
114,811 | 2023 |
3.3
|
B |
| 508 |
ADEBOLA ADELINE
IMO 9427627
|
156,813 | 2009 |
3.3
|
B |
| 507 |
TORM HELENE
IMO 9904871
|
115,575 | 2021 |
3.3
|
B |
| 506 |
DILIGENT WARRIOR
IMO 9750050
|
149,995 | 2016 |
3.3
|
B |
| 505 |
EBN HAWKEL
IMO 9874507
|
112,003 | 2021 |
3.3
|
B |
| 513 |
SOLA TS
IMO 9724350
|
112,939 | 2017 |
3.3
|
B |
| 512 |
VST OCEANIA
IMO 9740469
|
109,985 | 2017 |
3.3
|
B |
| 504 |
ATLANTIC EMERALD
IMO 9892975
|
109,201 | 2022 |
3.3
|
B |
| 515 |
GHAT
IMO 9930105
|
115,519 | 2022 |
3.3
|
B |
| 517 |
BERKELEY SQUARE
IMO 1027914
|
113,903 | 2025 |
3.3
|
B |
| 514 |
SFL TUCANA
IMO 9978327
|
109,895 | 2024 |
3.3
|
B |
| 520 |
SEA TURTLE
IMO 9886718
|
114,085 | 2021 |
3.3
|
B |
| 519 |
ADVANTAGE SPICE
IMO 9419888
|
156,657 | 2010 |
3.3
|
B |
| 518 |
NOUNOU
IMO 9960980
|
115,322 | 2023 |
3.3
|
B |
| 516 |
HUMBLE WARRIOR
IMO 9856361
|
149,990 | 2020 |
3.3
|
B |
| 521 |
ABLIANI
IMO 9693068
|
109,999 | 2015 |
3.3
|
B |
| 523 |
CRYSTAL
IMO 9956020
|
113,385 | 2024 |
3.3
|
B |
| 522 |
ACHILLEAS
IMO 9458494
|
157,883 | 2010 |
3.3
|
B |
| 526 |
IONIC ANAX
IMO 9802152
|
114,720 | 2017 |
3.3
|
B |
| 525 |
LYRIC MAGNOLIA
IMO 9734408
|
109,999 | 2016 |
3.3
|
B |
| 527 |
SEA STAR
IMO 9945289
|
109,999 | 2023 |
3.3
|
B |
| 524 |
CAPTAIN PARIS
IMO 9692844
|
113,876 | 2014 |
3.3
|
B |
| 528 |
BELGRAVE SQUARE
IMO 1027926
|
113,804 | 2025 |
3.3
|
B |
| 529 |
BOSSA NOVA SPIRIT
IMO 9637703
|
154,199 | 2013 |
3.3
|
B |
| 530 |
SIGRUN
IMO 9612052
|
156,092 | 2013 |
3.3
|
B |
| 533 |
RESILIENT WARRIOR
IMO 9856359
|
149,990 | 2020 |
3.3
|
B |
| 532 |
DELTA POSEIDON
IMO 9468671
|
157,380 | 2011 |
3.3
|
B |
| 531 |
HANOVER SQUARE
IMO 9783992
|
114,366 | 2019 |
3.3
|
B |
| 534 |
HENRIQUE DIAS
IMO 9453834
|
157,055 | 2007 |
3.3
|
B |
| 535 |
LIPARI
IMO 9529487
|
158,237 | 2012 |
3.3
|
B |
| 536 |
AIFANOURIOS
IMO 9891696
|
116,015 | 2021 |
3.3
|
B |
| 537 |
SEMAKAU SPIRIT
IMO 9833723
|
115,643 | 2019 |
3.3
|
B |
| 542 |
TORM HANNAH
IMO 9712864
|
109,999 | 2016 |
3.3
|
B |
| 541 |
ROBOLA
IMO 1021790
|
113,613 | 2023 |
3.3
|
B |
| 540 |
EAGLE BRASILIA
IMO 9795062
|
113,400 | 2019 |
3.3
|
B |
| 539 |
SEA PANTHER
IMO 9802164
|
114,723 | 2018 |
3.3
|
B |
| 538 |
RYMAN
IMO 9777931
|
113,000 | 2017 |
3.3
|
B |
| 546 |
MARLIN LAGOS
IMO 9823584
|
114,853 | 2022 |
3.3
|
B |
| 545 |
SEA GARNET
IMO 9772943
|
158,454 | 2017 |
3.3
|
B |
| 544 |
DELTA MED
IMO 9412309
|
161,653 | 2010 |
3.3
|
B |
| 543 |
FRONT CHEETAH
IMO 9686637
|
109,900 | 2013 |
3.3
|
B |
| 549 |
JARNAIN
IMO 9823546
|
114,831 | 2021 |
3.3
|
B |
| 548 |
ORCHID SPIRIT
IMO 9901867
|
112,750 | 2021 |
3.3
|
B |
| 547 |
SFL TAURUS
IMO 9978339
|
109,895 | 2024 |
3.3
|
B |
| 550 |
ELANDRA SWIFT
IMO 9945306
|
109,999 | 2024 |
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.