Net metering (salderen) ends on 1 January 2027. From then on every kWh you export earns only a feed-in fee of a few cents, while you pay around 30 cents to import. Run your own numbers below with Dutch starting values.
Starting values only. Your bill is the source of truth: enter your own import and export price in the simulator above.
| Typical import price | € 0.28 – 0.32 per kWh all-in |
|---|---|
| Export | Net metering until 31 Dec 2026, then a feed-in fee of roughly 1 – 8 cents per kWh |
| Solar yield | about 900 – 1,000 kWh per kWp per year |
| Battery prices | about € 500 – 800 per usable kWh installed |
Hardly. While exported kWh are netted against imported kWh at the full price, storing them adds no value. Switch the export rule above to "Paid per kWh" to see the situation from 2027.
Salderen ends. Suppliers pay a feed-in fee for exported solar power instead of netting it. The gap between what you pay and what you receive is exactly what a battery earns per stored kWh.
For a household of 3,000 – 4,000 kWh with 10 – 12 panels, 5 kWh usually covers the evening. The table above shows where extra capacity stops adding savings.
Other countries: GermanyBelgiumUnited KingdomIrelandFranceSpainItalyAustriaSwitzerlandAustraliaUnited StatesSouth Africa all countries
Change anything. Results update instantly. Pick a country for typical starting values, then type your own tariff from your bill.
Same roof and prices, only the battery changes. Bigger is not always better: once the battery covers your evenings, extra kWh sit idle.
| Battery | Battery saving / yr | Self-sufficient | Cycles / yr | Payback |
|---|
Every 15 minutes the simulator decides where each kilowatt-hour goes. Solar covers your use first, the surplus charges the battery, the battery covers your evening, the rest goes to or comes from the grid.
Your yearly kWh is spread over 365 days using a daily pattern for your profile: evening peaks for a home, daytime use for a business, more in winter than in summer.
Your panels produce a bell curve each day, long in summer and short in winter, scaled to the yield per kWp for your region. Nothing at night.
Every 15 minutes: solar covers your use first, the surplus charges the battery, the battery covers your evening, the rest is exported or imported. With 90% round-trip efficiency.
The same calculation runs on real smart-meter data in the WVE customer portal in the Netherlands: a virtual battery that follows a customer's measured 15-minute consumption for a month, with notifications and a report. Suppliers and installers can licence the engine for their own app, their own data and their own customers.
Free option: put the simulator on your own website in two minutes. Pricing for the engine starts with a pilot; software licence from € 995 per month including 100 simulations. We reply within two working days.