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 · 277 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 | 1,874 | 5–10% | €400k–1,200k | — | vendor claim |
| Bulbous bow reprofiling | 1,757 | 2–6% | €300k–900k | — | vendor claim |
| Turbocharger cut-out | 1,360 | 1–3% | €80k–250k | — | vendor claim |
| Methanol dual-fuel conversion | 1,195 | 5–15% | €8,000k–20,000k | — | vendor claim |
| Rotor sails (per unit) | 1,174 | route-dependent | €1,500k–3,500k | — | vendor claim |
| Suction wing sails (per unit) | 1,174 | route-dependent | €1,000k–2,500k | — | 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 |
|---|---|---|---|---|---|
| 100 |
NAVE ALLEGRO
IMO 9876414
|
313,433 | 2020 |
2.2
|
A |
| 102 |
PROTEUS INGRID
IMO 9923463
|
119,900 | 2020 |
2.2
|
A |
| 103 |
MAXIM
IMO 9604079
|
296,887 | 2011 |
2.2
|
A |
| 104 |
ADVANTAGE SMOOTH
IMO 9999620
|
174,728 | 2023 |
2.2
|
A |
| 105 |
NISSOS HERACLEA
IMO 9419618
|
313,875 | 2009 |
2.2
|
A |
| 108 |
IONIC SEMELI
IMO 1037933
|
159,120 | 2025 |
2.2
|
A |
| 107 |
MARAN ARIADNE
IMO 9770517
|
319,398 | 2016 |
2.2
|
A |
| 106 |
EAGLE VALLERY
IMO 9910246
|
299,473 | 2022 |
2.2
|
A |
| 109 |
DHT EUROPE
IMO 9315159
|
317,713 | 2007 |
2.2
|
A |
| 110 |
NORTH LOYALTY
IMO 9537771
|
314,000 | 2012 |
2.2
|
A |
| 111 |
ITHAKI
IMO 9526461
|
299,940 | 2011 |
2.3
|
A |
| 112 |
NEW ENERGY
IMO 9708526
|
318,866 | 2016 |
2.3
|
A |
| 113 |
NEW MELODY
IMO 9799185
|
307,431 | 2019 |
2.3
|
A |
| 114 |
SONANGOL NJINGA MBANDE
IMO 9938494
|
157,663 | 2023 |
2.3
|
A |
| 115 |
IONIAN SAILOR
IMO 9296389
|
149,997 | 2006 |
2.3
|
A |
| 117 |
NEW PEARL
IMO 9468322
|
301,525 | 2011 |
2.3
|
A |
| 116 |
TRINITY
IMO 9730361
|
158,734 | 2016 |
2.3
|
A |
| 118 |
IMOLA
IMO 1014876
|
156,906 | 2025 |
2.3
|
A |
| 120 |
NORDIC TELLUS
IMO 9818230
|
157,407 | 2018 |
2.3
|
A |
| 119 |
SONANGOL MAIOMBE
IMO 9766322
|
156,935 | 2017 |
2.3
|
A |
| 122 |
LAUSANNE STAR
IMO 1028530
|
158,100 | 2025 |
2.3
|
A |
| 121 |
AZURE NOVA
IMO 9602631
|
319,743 | 2012 |
2.3
|
A |
| 123 |
DELTA COMMANDER
IMO 9418157
|
157,477 | 2010 |
2.3
|
A |
| 126 |
HARMONIC
IMO 9819868
|
159,204 | 2019 |
2.3
|
A |
| 125 |
EAGLE SAN FRANCISCO
IMO 9795127
|
157,512 | 2018 |
2.3
|
A |
| 124 |
DELTA MARIA
IMO 9700691
|
157,031 | 2015 |
2.3
|
A |
| 127 |
MONTESPERANZA
IMO 9585871
|
159,179 | 2012 |
2.4
|
A |
| 128 |
BOLD WARRIOR
IMO 1058092
|
156,885 | 2025 |
2.4
|
A |
| 129 |
SEAWAYS MONTAUK
IMO 9779537
|
158,432 | 2017 |
2.4
|
A |
| 130 |
UNION PEACE
IMO 9339973
|
311,141 | 2007 |
2.4
|
A |
| 132 |
SEA AMETHYST
IMO 9920693
|
157,146 | 2022 |
2.4
|
A |
| 131 |
MARLIN SOMERSET
IMO 9835850
|
156,620 | 2019 |
2.4
|
A |
| 134 |
ADVANTAGE SMART
IMO 1028683
|
159,097 | 2025 |
2.4
|
A |
| 133 |
C. INNOVATOR
IMO 9595618
|
313,999 | 2012 |
2.4
|
A |
| 138 |
EAGLE SAN JOSE
IMO 9795139
|
157,512 | 2018 |
2.4
|
A |
| 140 |
AESOP
IMO 1030399
|
158,954 | 2025 |
2.4
|
A |
| 137 |
BRUGGE
IMO 9941855
|
157,138 | 2023 |
2.4
|
A |
| 136 |
VL PRIME
IMO 9683685
|
319,547 | 2015 |
2.4
|
A |
| 135 |
CEDAR
IMO 9907433
|
158,289 | 2022 |
2.4
|
A |
| 139 |
SEATRIUMPH
IMO 9783722
|
299,700 | 2015 |
2.4
|
A |
| 142 |
YASA SOUTHERN CROSS
IMO 9534030
|
318,438 | 2006 |
2.4
|
A |
| 141 |
TWIN POLLUX
IMO 9625968
|
320,475 | 2014 |
2.4
|
A |
| 144 |
SATURN MOON
IMO 9814430
|
158,000 | 2020 |
2.4
|
A |
| 145 |
DIMITRIOS
IMO 9900007
|
159,159 | 2021 |
2.4
|
A |
| 143 |
GULF SUNRISE
IMO 9788887
|
301,528 | 2017 |
2.4
|
A |
| 146 |
PATRIOTIC
IMO 9819832
|
159,090 | 2019 |
2.4
|
A |
| 147 |
PASCHALIS DD
IMO 9765378
|
159,812 | 2018 |
2.4
|
A |
| 150 |
SEAWAYS TYBEE
IMO 9734642
|
300,960 | 2015 |
2.5
|
A |
| 149 |
MARAN THETIS
IMO 9421427
|
320,105 | 2012 |
2.5
|
A |
| 148 |
FRONT CLASSIC
IMO 9759769
|
157,434 | 2017 |
2.5
|
A |
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.