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 · 286 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 | 1,283 | 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) | 1,064 | 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 |
|---|---|---|---|---|---|
| 704 |
ROSS SEA
IMO 9457593
|
114,542 | 2006 |
3.6
|
B |
| 706 |
PROTEUS SINEAD
IMO 9923413
|
109,999 | 2022 |
3.6
|
B |
| 702 |
GLORIA MARIS
IMO 9899997
|
156,620 | 2021 |
3.6
|
B |
| 701 |
YPAPANTI
IMO 9693082
|
109,999 | 2013 |
3.6
|
B |
| 705 |
SEASPRITE
IMO 9711468
|
113,998 | 2015 |
3.6
|
B |
| 703 |
HYDRA
IMO 9294551
|
105,744 | 2004 |
3.6
|
B |
| 708 |
FLAVIN
IMO 9787912
|
115,125 | 2015 |
3.6
|
B |
| 710 |
FEZZAN
IMO 9888730
|
114,243 | 2021 |
3.6
|
B |
| 707 |
EAGLE KUANTAN
IMO 9417012
|
107,481 | 2010 |
3.6
|
B |
| 712 |
STI ALEXIS
IMO 9696694
|
109,999 | 2015 |
3.6
|
B |
| 711 |
NORDIC VEGA
IMO 9412581
|
164,028 | 2010 |
3.6
|
B |
| 709 |
SAFEEN ELIZABETH
IMO 9524449
|
158,573 | 2008 |
3.6
|
B |
| 714 |
STI LOBELIA
IMO 9838228
|
109,994 | 2017 |
3.6
|
B |
| 713 |
STI SANCTITY
IMO 9719707
|
109,999 | 2013 |
3.6
|
B |
| 717 |
PACIFIC ANNA
IMO 9772010
|
109,999 | 2017 |
3.6
|
B |
| 719 |
SARASOTA A
IMO 9383869
|
106,849 | 2008 |
3.6
|
B |
| 716 |
PROTEUS HARVONNE
IMO 9923401
|
109,999 | 2022 |
3.6
|
B |
| 721 |
NISSOS CHRISTIANA
IMO 9694658
|
114,264 | 2015 |
3.6
|
B |
| 720 |
DELTA SPIRIT
IMO 9419096
|
161,724 | 2010 |
3.6
|
B |
| 715 |
MELTEMI I
IMO 9298741
|
163,759 | 2006 |
3.6
|
B |
| 718 |
BALLA
IMO 9749556
|
113,293 | 2017 |
3.6
|
B |
| 722 |
HAFNIA SHANGHAI
IMO 9830290
|
74,999 | 2019 |
3.6
|
C |
| 723 |
ARETEA
IMO 9711456
|
113,969 | 2015 |
3.6
|
C |
| 726 |
PATROCLUS
IMO 9413834
|
158,267 | 2009 |
3.6
|
C |
| 725 |
PACIFIC NAFSIKA
IMO 9732278
|
109,999 | 2016 |
3.6
|
C |
| 724 |
BREEZE III
IMO 9292515
|
115,525 | 2005 |
3.6
|
C |
| 727 |
JAG LAKSHYA
IMO 9516117
|
157,641 | 2011 |
3.6
|
C |
| 729 |
TORM INNOVATION
IMO 9602722
|
73,847 | 2013 |
3.6
|
C |
| 728 |
DREPANOS
IMO 9420643
|
107,467 | 2012 |
3.6
|
C |
| 730 |
MARLIN HESTIA
IMO 9729233
|
74,260 | 2017 |
3.7
|
C |
| 731 |
MINERVA ZENOBIA
IMO 9787182
|
114,671 | 2015 |
3.7
|
C |
| 733 |
MINERVA VERA
IMO 9411941
|
158,022 | 2009 |
3.7
|
C |
| 732 |
ON PHOENIX
IMO 9893228
|
114,623 | 2021 |
3.7
|
C |
| 734 |
ATLANTIC EMERALD
IMO 9892975
|
109,201 | 2019 |
3.7
|
C |
| 738 |
DELTA IOS
IMO 9406685
|
157,484 | 2009 |
3.7
|
C |
| 737 |
SELETAR SPIRIT
IMO 9484077
|
108,993 | 2008 |
3.7
|
C |
| 736 |
TORM GABRIELLA
IMO 9428994
|
119,456 | 2010 |
3.7
|
C |
| 735 |
SEA PANTHER
IMO 9802164
|
114,723 | 2015 |
3.7
|
C |
| 740 |
FRONT ANTARES
IMO 9745926
|
111,059 | 2014 |
3.7
|
C |
| 741 |
HAFNIA LARVIK
IMO 9946465
|
109,999 | 2023 |
3.7
|
C |
| 739 |
LIPARI
IMO 9529487
|
158,237 | 2012 |
3.7
|
C |
| 743 |
HOVDEN SPIRIT
IMO 9596997
|
105,276 | 2010 |
3.7
|
C |
| 742 |
ANWAAR BENGHAZI
IMO 9888742
|
114,077 | 2021 |
3.7
|
C |
| 746 |
BOCCADASSE
IMO 9829899
|
109,991 | 2018 |
3.7
|
C |
| 745 |
STI RAMBLA
IMO 9730880
|
109,999 | 2017 |
3.7
|
C |
| 744 |
TIGANI
IMO 9776767
|
112,763 | 2017 |
3.7
|
C |
| 749 |
GEMINI SUN
IMO 9343340
|
115,577 | 2008 |
3.7
|
C |
| 748 |
HUMBLE WARRIOR
IMO 9856361
|
149,990 | 2020 |
3.7
|
C |
| 747 |
SEARUBY
IMO 9759795
|
114,073 | 2017 |
3.7
|
C |
| 750 |
SKS DRIVA
IMO 9428970
|
119,456 | 2010 |
3.7
|
C |
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.