Dynamic electricity tariffs: how a smart home profits from cheap hours
When the price of electricity changes every hour, the house that can wait wins.
A dynamic tariff passes the wholesale price of electricity through to your bill, hour by hour or even quarter hour by quarter hour. Prices for the next day are set in the day-ahead auction around midday and published shortly after, so a smart home knows tomorrow's cheap and expensive hours in advance. On sunny weekends and windy nights, wholesale prices can fall close to zero or even below; on still winter evenings they peak.
What actually moves
Only the energy component varies. Grid fees, taxes, levies and the supplier's margin are added per kilowatt hour as before. In Germany these fixed parts make up the majority of a household price, so a wholesale price of zero still leaves you paying a substantial amount per kilowatt hour. The saving comes from moving consumption, not from free electricity.
Who benefits
- Electric car owners: a car that is plugged in overnight can charge in the four cheapest hours instead of the first four.
- Heat pump owners: a well insulated house or a buffer tank lets the heat pump run harder in cheap hours and coast through expensive ones.
- Households with automation: dishwashers, washing machines and dryers with a start delay or smart control.
A household without large flexible loads, which cooks and washes at fixed times, gains little and carries the risk of evening peaks.
What you need
A dynamic tariff requires a meter that records consumption in short intervals; in Germany, that is a smart metering system (intelligentes Messsystem). Since 2025, every German electricity supplier has to offer at least one dynamic tariff to customers with such a meter. Beyond the meter, you need something that acts on the prices: a home energy management system, a wallbox or heat pump with tariff integration, or at the very least an app that tells you when to start the washing machine.
Dynamic tariffs and solar
With a large solar array, your own roof is cheaper than the grid at almost any hour, so the tariff matters mainly in winter and at night. The combination becomes interesting with storage: on a cloudy winter day, a battery can be topped up from the grid during the cheapest night hours and discharged during the evening peak. Whether that pays depends on the price spread, battery losses and local rules on grid charging, and it rarely makes large profits. Treat it as a bonus, not a business case.
The risks
Wholesale prices can spike during cold, windless periods. Without flexibility, a dynamic tariff can then cost more than a fixed one. Before switching, look at your consumption pattern: how much of it could really move? Check the monthly base fee, the supplier's surcharge per kilowatt hour and the notice period, and keep an eye on the first winter's bills.
Questions and answers
How does a dynamic electricity tariff work?
The energy part of your price follows the wholesale day-ahead market, which sets prices for each hour or quarter hour of the next day. Grid fees, taxes and levies are added as fixed amounts per kilowatt hour.
Is a dynamic tariff worth it without an electric car or heat pump?
Usually not. Without large loads that can shift in time, the savings are small and evening price peaks can make it more expensive than a fixed tariff.
Written by the sunaliv editorial team. Figures are typical ranges for Central Europe unless stated otherwise and reflect the state of knowledge in October 2026. Spotted an error? Write to info@nextao.de and we will correct it openly.
