Dynamic electricity tariff · Glossary

A dynamic electricity tariff is an electricity supply contract in which the energy price per kilowatt hour consumed changes over time and is linked to wholesale prices. If the exchange price falls, the energy price for the electricity consumed during that time also falls. If it rises, consumption becomes more expensive. Usually the day-ahead price serves as the basis. It is formed in a daily auction for each delivery interval of the following day. Since 1 October 2025, this auction in Europe no longer sets 24 hourly prices but 96 quarter-hourly prices. Older descriptions that only mention hourly prices are therefore outdated for the wholesale market. How finely a supplier passes these prices on to its customers is governed by the respective contract.

Energy is billed, not power. An electric car charging at 11 kilowatts for one hour draws 11 kilowatt hours. The dynamic tariff determines what this quantity of energy costs at the respective point in time. Connection capacity, peak load or grid capacity are separate topics. Two households with the same annual consumption can therefore have very different costs, depending on whether their large consumption falls in cheap or in expensive quarter hours.

Legal framework in Germany

The basis is Section 41a and the definition in Section 3 EnWG. According to the definition there, a dynamic tariff reflects the price fluctuations on the spot markets, that is, on the day-ahead and the intraday market. The intervals must be at least as fine as the settlement intervals of the respective market. According to Section 41a(2) EnWG, since 1 January 2025 all electricity suppliers must offer such a contract, regardless of the number of their customers. Previously the obligation applied only to suppliers with more than 100,000 final consumers. The contract must be offered to final consumers who have a smart metering system within the meaning of the Metering Point Operation Act (Messstellenbetriebsgesetz).

The law protects consumers in several ways. Suppliers must provide comprehensive information on the costs, advantages, disadvantages and risks of dynamic tariffs and offer information on the installation of a smart metering system. Before the contract is concluded and before a renewal with changed terms, a concise, clearly labelled summary of the most important conditions is required. Among other things, it must break down the individual price components. At the customer's request, the tariff must also be offered without grid use and metering point operation if the customer has arranged both themselves. As a counterpart, Section 41a(4) obliges suppliers with more than 200,000 final consumers to also offer a fixed-price contract with a term of at least twelve months. Suppliers that offer only dynamic tariffs are exempt. These rules apply to Germany as published on gesetze-im-internet.de.

Price components: the exchange price is not the end-customer price

Usually only the part of the price related to procurement on the wholesale market is dynamic. In addition there is a supplier markup and often a monthly basic charge. The other electricity price components follow their own rules: grid charges, concession fee, levies, electricity tax and value added tax. This is why a household does not automatically receive money for every kilowatt hour when there are negative electricity prices on the exchange. The fixed components generally remain. Anyone comparing tariffs should therefore distinguish three quantities: the exchange price, the supplier's delivery price and the full energy price including all charges.

Distinction from fixed and time-of-use tariffs

With a fixed-price tariff, the energy price stays the same over a longer period. The supplier bears the procurement risk and offsets it through its purchasing strategy and risk premiums. The customer can plan well but does not learn when electricity is scarce or plentiful. A time-of-day tariff works with predefined time windows, such as a cheap night-time rate. It reflects the actual market situation only roughly. A dynamic tariff, by contrast, follows the real spot prices. These can change from day to day and from quarter hour to quarter hour.

Grid-related price signals must be distinguished from this. Since 1 April 2025, distribution system operators must offer a time-variable grid charge for controllable consumption devices under Section 14a EnWG, the so-called Module 3. It has three price levels: high, standard and low tariff. It can only be chosen together with Module 1. In 2026 the Federal Network Agency (Bundesnetzagentur) initiated proceedings against grid operators that have not implemented Module 3. This grid charge is based on the load on the local grid, not on the exchange price. Both signals can be combined, but can also point in different directions.

Technical requirements

For time-accurate billing, consumption must be measured with time resolution. A Ferraris meter or a simple digital metering device shows only total consumption over a longer period. The law therefore ties the obligation to offer the tariff to a smart metering system. It records quarter-hourly values and transmits them securely. Possible additional costs for installation and operation belong in every profitability calculation.

Whether the tariff pays off depends less on annual consumption than on the load profile and on how much consumption can be shifted. Well suited are charging electric cars, heat pumps with heat storage, battery storage, water heating and some commercial processes. For lighting, cooking or entertainment electronics there is hardly any room for manoeuvre. In practice, energy management systems, wallboxes and heat pump controllers handle the response to prices automatically, because with 96 prices a day manual control is hardly realistic. They must observe limits in doing so: the car must be charged at the desired time, the home must stay warm, and the ageing of a battery storage system must not eat up the price advantage.

Significance for the electricity system

The more wind and solar power there is, the more strongly supply fluctuates. Consumption, however, follows its own patterns, such as the evening peak in households. Dynamic tariffs create an incentive here: if a lot of renewable electricity is available and demand is low, the price tends to be low. If demand is high and supply is tight, it tends to be high. If shiftable loads move to cheap times, the residual load in the expensive hours falls. Fewer expensive power plants are needed, and fewer renewable plants have to be curtailed. In this way, dynamic tariffs make the flexibility of the demand side economically visible. How strongly prices fluctuate is shown by the first day with quarter-hourly prices, 1 October 2025: at midday the price was around 61 euros per megawatt hour, in the evening around 409 euros.

Typical misunderstandings and limits

No guarantee of cheap electricity: A dynamic tariff redistributes opportunities and risks. In times of scarcity, electricity can be considerably more expensive than under a fixed-price tariff. Anyone with a lot of non-shiftable evening consumption benefits little or pays more.
Cheap does not automatically mean green: Low prices often coincide with a lot of wind and solar power. But they also depend on demand, fuel prices, the availability of power plants and cross-border electricity flows. The tariff reflects the market price, not the origin of the electricity.
Not automatically good for the grid: The exchange price applies to the whole Germany-Luxembourg bidding zone. It does not show how heavily an individual local grid transformer is loaded. If many wallboxes and heat pumps in one street respond to the same low price at the same time, a new load peak can arise. Control under Section 14a EnWG, time-variable grid charges and limits on connection capacity serve as safeguards.
Unevenly distributed benefit: Households with their own home, wallbox, heat pump and energy management benefit particularly. Tenant households with few controllable devices have fewer options. Transparent information, metering costs and the legally secured offer of a fixed-price contract therefore remain important.

Conclusion

Whether a tariff works depends on its design: basic charge, markup, price limits, interval length and billing logic change the incentive. Two tariffs called dynamic can therefore have very different effects. A dynamic electricity tariff is a pricing model for time-dependent electricity consumption. Its benefit only arises when loads are shiftable, metering is reliable, the rules are understandable, and market price and grid situation are kept clearly apart.

Sources

§ 41a EnWG – Lastvariable, tageszeitabhängige oder dynamische und sonstige Stromtarife sowie Festpreisverträge — Bundesministerium der Justiz / Bundesamt für Justiz (gesetze-im-internet.de); unbekannt (abgerufen 2026-11-11). § 41a Abs. 1–7
Dynamische Stromtarife — Bundesnetzagentur; unbekannt. Verbraucherportal, Abschnitte zu Rechtsgrundlagen, Arbeitspreis und vorvertraglichen Informationen
15-minute products in Market Coupling — EPEX SPOT; unbekannt (Einführung 30.09.2025 für Lieferung 01.10.2025). Abschnitt Introduction of 15-minute MTU contracts for Day-Ahead – SDAC
Verfahren wegen mangelnder Umsetzung der Netzentgeltreduzierungen für Elektrofahrzeuge und Wärmepumpen — Bundesnetzagentur; 2026-05-28. Pressemitteilung, Abschnitt Hintergrund
Dynamische Stromtarife – Rechtliche Vorgaben und deren Erfüllung — Stiftung Umweltenergierecht; 2023-10-18. Folien zur Legaldefinition (damals § 3 Nr. 31b EnWG)

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Edited by eCMS on 11.11.2026 19:42