Electricity prices and tariffs

Dynamic tariffs and spot prices

Dynamic tariffs are based on wholesale market prices, typically the day-ahead market price from EPEX SPOT.

A spot price is the market-clearing electricity price for a specific delivery interval. It changes over time based on expected supply and demand.

Depending on the market and country setup, spot prices are available as:

• hourly prices
• 15-minute prices (introduced in many markets from 2025 onward)

Components of your electricity tariff

Your total electricity cost usually combines:

• energy price (commodity price)
• grid fees (network charges)
• levies and taxes (for example VAT)

In Zerofy, these components can be set manually and can be taken from your electricity bill.

In some cases, when your provider account is connected, tariff values can be filled automatically.

Why full tariff data matters for battery control

For battery optimization, especially in countries where export/discharge to grid is supported, the app needs the full end-user price signal.

That means not only the spot price, but also grid fees and levies. Without full tariff components, charge/discharge decisions can be economically wrong.

Solar feed-in tariff

The feed-in tariff is the compensation you receive for electricity exported to the grid from your PV system.

This value is used to compare self-consumption versus export value in optimization decisions.

Supported tariff models

For electricity price:

• spot price plus margin (margin as fixed amount or percent)
• flat price
• day/night tariff

For grid fees:

• fixed
• day/night

For solar feed-in tariff:

• fixed
• flat