
How do dynamic energy tariffs work and how can you earn more with a batería doméstica? Explanation, suppliers, calculations and tips.
With a traditional contrato de energía, you pay a fixed price per kWh, for example EUR 0.25. With a contrato dinámico, the price varies per hour (or per quarter hour) based on the actual market price on the mercado spot EPEX.
Electricity prices on the mercado spot EPEX vary significantly:
| Time | Typical price (incl. IVA, excl. grid fees) | Why |
|---|---|---|
| Night (02:00-06:00) | EUR 0.03-0.10 | Low consumption, wind generation |
| Morning (07:00-09:00) | EUR 0.15-0.30 | Peak consumption, everyone wakes up |
| Daytime (10:00-16:00) | EUR 0.00-0.15 | Lots of energía solar, sometimes negative prices |
| Evening peak (17:00-21:00) | EUR 0.20-0.40 | Cooking, TV, heating, little sun |
| Night (22:00-02:00) | EUR 0.05-0.12 | Consumption decreases |
On sunny days in spring and summer, precio de la electricidads can even go negative during the day — you actually get paid to consume electricity. On cold winter evenings, prices can rise to EUR 0.50 or more.
The strategy is simple: buy low, use high.
Modern baterías domésticas like the Zendure SolarFlow and Anker SOLIX connect to the mercado spot EPEX via their app. The system automatically plans when to carga y descarga, based on the expected prices for the next 24 hours.
Assumptions: 10 kWh usable capacidad de la batería, one full cycle daily (realistic in combination with paneles solares), average price difference between cheapest and most expensive hour: EUR 0.15/kWh.
| Cálculo | Value |
|---|---|
| Daily saving | 10 kWh x EUR 0.15 = EUR 1.50 |
| Monthly saving | EUR 45 |
| Annual saving from tarifas dinámicas | EUR 540 |
In practice, this varies. In winter, price differences are larger (more savings), in summer they are smaller. A realistic estimate for an actively managed 10 kWh system is EUR 300-600 por año.
On days with negative precio de la electricidads (in 2025, there were more than 100 hours with negative prices in los Países Bajos) you literally earn money by charging your battery. You get paid to consume electricity and then use that power in the evening.
The main Dutch suppliers with contrato dinámicos in 2026:
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| Proveedor | Tipo de tarifa | Detalles |
|---|---|---|
| Tibber | Hourly EPEX price | Most popular, good app, Tibber Pulse dongle |
| Frank Energie | Hourly EPEX price | Competitive rates, clear app |
| ANWB Energie | Hourly EPEX price | Via Tibber platform |
| Easy Energy | Hourly EPEX price | No fixed supply costs |
| Zonneplan | Hourly EPEX price | Smart charging EV integration |
| Beursstroom | Hourly EPEX price | Transparent, low markup |
| NextEnergy | Hourly EPEX price | Newcomer with competitive rates |
Tip: Don't just look at the kWh price but also at the fixed supply costs, grid fees and the markup your supplier charges on top of the EPEX price.
Not every battery is equally suitable. The key requirements:
| Brand/Model | Tarifa dinámica integration | Rating |
|---|---|---|
| Zendure SolarFlow | Built-in, very good. Automatic EPEX optimisation via app | Best in class |
| Anker SOLIX (Solarbank + X1) | Good. P1 dongle connection, smart charging schedules | Very good |
| EcoFlow DELTA Pro Ultra | Basic. Via Hogar Inteligente Panel and external integration | Good |
| Huawei LUNA 2000 | Via inversor + external integration (Home Assistant) | Good, more manual |
Five practical tips to get the most out of your contrato dinámico and batería doméstica:
The precio spot EPEXs for the following day are published every day at 13:00. Smart batteries use this data automatically. Check whether your system supports this.
Free solar power is always more advantageous than cheap grid power. Set your battery to prioritise generación solar over charging from the grid.
The highest tariffs typically fall between 17:00 and 21:00. Make sure your battery is sufficiently charged at those times to cover your consumption.
Use your battery's app and your proveedor de energía's app to monitor your savings. After a month, you'll see patterns and can refine your strategy.
Schedule your washing machine, dishwasher and other high-consumption appliances during cheap hours. In combination with a batería doméstica, you reduce your energy costs to the maximum.
Tarifas dinámicas are not without risk:
Our honest advice: A contrato dinámico combined with a batería doméstica is financially more attractive for most hogares with paneles solares than a fixed contract. But it requires a batería doméstica with good control inteligente. Without a battery, you're vulnerable to price spikes.
Savings vary from EUR 200 to EUR 600 por año, depending on your capacidad de la batería, consumption pattern and how actively you optimise. Hogares with paneles solares and a 10 kWh battery save on average EUR 350-500 por año compared to a fixed contract.
No, a contrato dinámico also works without paneles solares. With just a batería doméstica, you benefit from the price difference between cheap and expensive hours. But the combination with paneles solares is the most profitable, as you also store free solar power.
In theory yes, if you systematically consume electricity at the most expensive times. In practice, a batería doméstica with control inteligente ensures you do the exact opposite. The risk is minimal when you use a battery with automatic optimisation.
Switching can usually be done within 2-4 weeks. Your current supplier has a cancellation period of a maximum of 30 days (with a variable contract) or until the end of the contract period (with a fixed contract). There are no costs associated with switching.
The mercado spot EPEX is the day-ahead market on which most contrato dinámicos are based. The imbalance market is the real-time market where the grid is balanced. Some advanced systems can also trade on the imbalance market, but this is more complex and not accessible to most consumers.
Patrick de Home Energy Solutions
Founder & certified energy advisor
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