Propeller redesign / replacement retrofit
vendor claim — not yet independently measuredReplacing the propeller with one optimised for the ship's actual operating profile — modern blade sections, larger diameter or adapted pitch. Effective when the original design point (speed, draught) no longer matches how the ship trades.
5–10%
CO₂ emissions reduction
€400k–1,200k
indicative capex band (vendor/literature prior)
3–5 days
drydock required
12,286
eligible vessels in our database
Which ships it suits
- Segments: Bulk carrier, Chemical tanker, Combination carrier, Container ship, Gas carrier, General cargo ship, LNG carrier, Oil tanker, Refrigerated cargo carrier, Ro-ro ship, Vehicle carrier
- Remaining service life: at least 8 years (payback must fit inside it)
Addressable opportunity (CII band D/E fleet)
2,492
D/E vessels eligible for this measure
€997–2,990M
installed-base capex range
1.25–2.50 Mt
annual CO₂ reduction (claimed range × reported emissions)
Eligible vessels — worst CII band first
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Measured real-world outcomes
The reduction range above is a vendor claim. We continuously detect completed retrofits in shipyard-visit, equipment and EU MRV emissions data and measure the actual AER change. Measured results are published per measure once at least 30 controlled observations exist — until then, treat vendor ranges as ceilings: real-world delivery is consistently at or below the low end.