Why Premiums and ROI Are Two Separate Calculations
A premium lowers the purchase cost of an installation — a one-time amount, often tied to the installation type, the region, and sometimes the client's income. Which energy contract stays most advantageous afterward, on the other hand, depends on the client's usage pattern and market tariffs — a recurring question, independent of the investment itself. Both belong in the conversation with the client, but conflating them rarely serves the client's actual question.
What You Can Calculate Yourself: Payback, ROI and NPV from Real Usage Data
What does stay in your hands: the final financial recommendation (payback, ROI, NPV) of the investment itself, based on the client's real quarter-hourly data — with or without a premium in the calculation. A premium then becomes an input value (a discount on the initial investment) rather than a separate, standalone question.
Where to Send Clients for Current Premium Amounts, Region by Region
Exact premiums, their conditions, and amounts change regularly and differ by region, grid operator, and sometimes municipality — a list here would go stale within months. Check which region your client is in first: in Wallonia, SPW Énergie; in Brussels, Bruxelles Environnement (RENOLUTION premiums); in Flanders, Fluvius or the Flemish Energy and Climate Agency (VEKA). Always verify current conditions with the relevant channel, and only calculate what you're actually certain of yourself: the effect of a given premium amount on the payback period.
A Concrete Conversation Instead of a Guess
A client who sees both the premium and the final financial recommendation clearly side by side, with each set of assumptions visible separately, can decide without having to untangle the two calculations themselves — and you don't have to invent a premium amount or guarantee something you don't manage.