Retrofit Payback

Simple payback and NPV for an energy-saving retrofit - WHR, air lubrication, wind assist, hull coating, battery hybrid. Inputs: capex, annual fuel saved, bunker price, discount rate and project horizon.

LifecycleEconomic

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{Saving}_\text{annual} = F_\text{saved} \cdot P_\text{fuel} + C_\text{avoided} \cdot P_\text{carbon} - \text{Opex}

Symbol	Meaning	Unit
$Capex$	Up-front capital cost	USD
$Opex$	Incremental annual operating cost	USD / year
$F_\text{saved}$	Fuel saved	t / year
$P_\text{fuel}$	Bunker price	USD / t
$C_\text{avoided}$	CO₂ avoided (subject to carbon price)	t / year
$P_\text{carbon}$	Effective EUA + FuelEU carbon price	USD / t
$r$	Discount rate	fraction
$N$	Project horizon	years

Source: Stopford - *Maritime Economics* (investment appraisal chapter); IMO Global MTCC Network - energy-efficient technology finance guidance

In short

Simple payback and NPV for an energy-saving ship retrofit including bunker and carbon-price savings.

Learn the theory Ship Finance and Asset Valuation