Your dashboard shows how much you've saved with your solar panels and, where they apply, your battery and your dynamic energy contract, compared to your home without them. Using your actual energy prices together with your energy usage, we translate this into an amount saved.
Solar panel savings
This is how much money your solar panels have saved you. We compare two scenarios for the same period: what you would have paid if all your electricity came from the grid, versus what you actually paid using power from your panels first. Any extra solar power you didn't use gets exported and credited at the export rate. The difference between these two amounts is what you've saved with your solar panels.
Battery savings
This only appears if your site has a battery installed and shows the extra money your battery has saved you, on top of your solar savings. Without a battery, any solar power you don't use right away is exported immediately. With your battery, that surplus is stored and used later, for example in the evening, instead of buying electricity from the grid at that time.
If you also have a dynamic contract, your battery can charge from the grid when electricity is cheap and use that power when it's expensive, or hold surplus solar back and feed it in when the price is at its best. Over a day that shows as a dip below zero while it charges, and a gain later when the stored electricity covers your use at expensive hours.
What you've saved with your battery is the difference between what you would have paid with just your solar panels and what you actually paid with your battery included.
Dynamic contract savings
This only appears if you have a dynamic energy contract, where your price follows the market through the day, changing every hour or every 15 minutes, instead of staying fixed. It shows what your contract gained you compared to an average fixed contract over the same period.
We take the electricity you actually imported from and exported to the grid, and price it twice: once at the prices you really paid, and once at the average fixed-contract price for that month. The difference is your dynamic contract saving.
The reference price is not our own estimate. For electricity you import, we use the average price Dutch consumers pay per kWh on a fixed contract, published monthly by CBS (Statistics Netherlands), including energy tax and VAT. For electricity you export, current net metering rules mean an exported kWh is worth the same as an imported one, minus the feed-in charge (terugleverkosten) suppliers apply. We take those charges from Keuze.nl, which tracks them monthly across suppliers. Both figures are published after a month has ended, so the current month uses the most recent published figures. These are national averages, so the fixed contract you would personally have been offered may have been cheaper or more expensive than the reference.
Your dynamic contract saving can be negative. It rewards using electricity when prices are low; if most of your usage happened in expensive hours, a fixed contract could be cheaper for you over that period, and the figure will say so.
About these figures
These figures are estimates, not exact measurements. They're calculated by comparing your actual energy use against a hypothetical scenario using the (average) energy prices that applied at the time. They don't account for every real-world factor, such as changes to your contract, pricing plan, or how you'd have used electricity differently without solar, a battery, or prices that change through the day, so they should be treated as a helpful guide to the value your system provides rather than a precise financial figure.
Sources
- Average fixed-contract prices: CBS, table 85592NED — Gemiddelde energietarieven voor consumenten. © Centraal Bureau voor de Statistiek, Den Haag/Heerlen. We add the supply price and the energy tax together into one all-in price per kWh.
- Feed-in charges: Keuze.nl. We convert their annual charges into a price per kWh.
Both datasets are used under CC BY 4.0.
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