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Glossary · Energy industry & energy transition

Balance responsibility

Balancing group responsibility Balancing group electricity market Balancing energy forecast schedule balancing energy market participants

Concept and basic idea

Balance responsibility refers to the obligation of a market participant to plan and manage the feed-ins, withdrawals and trades in a balancing group so that they are balanced as far as possible in every settlement period. If actual volumes deviate from the notified volumes, the participant bears financial responsibility for this. In this way, a physical requirement of the power system, namely that generation and consumption must be in balance at all times, is translated into an economic responsibility in the market. EU law states the principle in general terms: all market participants are responsible for the imbalances they cause in the system.

A balancing group is neither a line nor a power plant or a storage unit. It is an accounting account for electricity volumes. Deliveries, procurement, generation, consumption and trading positions are netted against each other in it. What matters is the amount of energy per time interval, in Germany per quarter-hour, expressed in kilowatt-hours or megawatt-hours. For grid operation, instantaneous power is what counts. For settlement, by contrast, what counts is how much more or less energy than planned was fed in or withdrawn in a quarter-hour.

Legal framework: EU and Germany

At EU level, Article 5 of the Electricity Market Regulation (EU) 2019/943 governs balance responsibility. A market participant can either assume this responsibility itself as a balance responsible party or transfer it by contract to a balance responsible party of its choice. The Regulation defines the balance responsible party as a market participant or its chosen representative that is responsible for its imbalances. Member States may provide for exemptions only in narrowly limited cases exhaustively listed in the Regulation. They can offer incentives to market participants with exemptions to voluntarily assume full responsibility. The EU Electricity Market Directive expressly extends this logic to aggregators and to active customers that operate their own storage facility.

In Germany, the central rule was set out until the end of 2025 in section 4 of the Electricity Network Access Ordinance (StromNZV). Under it, balancing groups are formed within a control area, and every feed-in and withdrawal point must be assigned to a balancing group. For each balancing group, a balance responsible party must be designated vis-à-vis the competent transmission system operator. This party is responsible for a balanced position in every quarter-hour and bears economic responsibility for deviations. Sub-balancing groups are permissible, as are balancing groups that contain only trades. The StromNZV expired at the end of 31 December 2025. The Federal Network Agency therefore transferred the balancing rules into its determination on business processes for supplier switching (GPKE, ref. BK6-22-024). According to the statement of reasons of the decision, the chapter “Balancing groups” corresponds word for word to the former section 4 StromNZV. In substance, the obligation therefore continues to apply; only the legal basis has changed. In detail, the standard balancing group contract and the processes for balancing group settlement (MaBiS) govern the handling.

Tasks of the balance responsible party

The balance responsible party prepares the schedule, notifies trades, organises forecasts and ensures that its portfolio adds up overall. The portfolio may include electricity customers, wind farms, solar installations, conventional power plants, storage units, direct marketing contracts or exchange trades. For suppliers, the responsibility arises mainly from the expected consumption of their customers; for generators and direct marketers, from the expected feed-in. Traders maintain balancing groups in order to allocate purchased and sold volumes cleanly. In addition, the balance responsible party must review in good time the data transmitted to it for balancing group settlement and report objections without undue delay.

The task is not finished with the forecast. If it becomes apparent that a portfolio is short, the balance responsible party can buy additional electricity on the intraday market. If a surplus is foreseeable, it can sell electricity or activate flexible demand. Balance responsibility is thus closely linked to flexibility: the faster and more precisely installations, storage units and consumers respond to signals, the smaller the remaining deviations stay.

Settlement: balancing energy and reBAP

Imbalance energy is not the same as balancing energy. Balancing energy is the power or energy that transmission system operators actually activate in order to stabilise the grid physically. Imbalance energy refers to the after-the-fact settlement of the deviations of individual balancing groups. If a balancing group withdraws more electricity in a quarter-hour than is allocated to it, it is short. If it feeds in more or withdraws less than planned, it is long. The transmission system operators net the excess and shortfall feed-ins of all balancing groups on a 15-minute basis.

Deviations are valued at the uniform cross-control-area imbalance settlement price (reBAP). The four German transmission system operators determine it jointly in the grid control cooperation. In essence, it results from the costs of the balancing energy deployed, divided by the volumes of balancing energy deployed per quarter-hour. The reBAP is in principle symmetrical, i.e. it applies equally to long and short positions, and can be positive or negative. A deviation therefore does not automatically lead to costs. Whoever deviates in a quarter-hour against the overall imbalance may receive a credit. Whoever deviates in the same direction as the overall system pays. Additional components such as a scarcity component set lower and upper limits respectively. When the capacity reserve is called upon, the price can exceptionally become asymmetrical. The price is intended to create incentives to improve forecasts and to react in good time to foreseeable deviations.

Distinction from technical grid operation

Balance responsibility must be distinguished from technical grid operation. Grid operators maintain voltage, monitor equipment, eliminate congestion and operate the grid safely. Transmission system operators activate balancing energy when generation and consumption diverge in the short term and the frequency must be stabilised. At that moment the balance responsible party does not necessarily switch on a power plant or a load itself. Its task is to avoid and limit deviations and to bear the remaining ones economically. Physical stabilisation and commercial attribution interlock, but remain separate functions.

There is also a difference from redispatch and congestion management. Redispatch adjusts power plant dispatch or feed-in when grid congestion threatens or exists. A balancing group can be balanced on paper and still contribute to regional congestion if feed-in and withdrawal do not spatially match the available grid. Balancing considers volumes per time interval within a control area, and the imbalance settlement price even applies uniformly across Germany. The grid, by contrast, must additionally take into account locations, lines and equipment. A balanced balancing group therefore does not guarantee a congestion-free grid.

Common misunderstandings

  • No real-time guarantee per supplier: Balance responsibility does not mean that every supplier generates, at every second, exactly the amount its customers consume. Electricity is not physically assigned to individual contracts. Balancing groups allocate energy volumes commercially and in regulatory terms, namely as quarter-hour sums. They do not replace the shared physics of the grid.

  • Deviation is not the same as misconduct: Forecasts are never perfect. A power plant can fail, a wind front can arrive earlier, an industrial load can run differently than announced. It becomes problematic only when an actor systematically plans at the expense of the overall system, neglects forecast quality or exploits pricing rules. Settlement is meant to allocate costs and incentives, not to pass moral judgement on every deviation.

  • A large deviation does not mean a supply gap: A large balancing group deviation in a single quarter-hour does not mean that supply was at risk. Grid operators maintain the frequency with operational measures. Settlement then ensures that the costs are allocated to those who caused them.

Significance with a growing share of renewable energy

With the expansion of renewable energy, the practical significance of balance responsibility has grown. Wind and solar power cannot be generated to a schedule like a fuel-fired power plant, even if modern forecasts estimate their feed-in quite well. Cloud fields, wind fronts, plant availability and curtailments change the actual feed-in. At the same time, demand is becoming more flexible, for example through heat pumps, electromobility, battery storage and controlled industrial loads. Balance responsibility forces market participants not only to observe such uncertainties technically, but to translate them into binding market processes.

Data, processes and responsibilities

Institutionally, balance responsibility rests on a web of market rules, data processes and responsibilities. Suppliers need correctly assigned market locations, meter readings, standard load profiles or data from smart metering systems, as well as forecasting models and functioning market communication with grid operators. The transmission system operators carry out balancing group settlement and publish the imbalance settlement price. The distribution system operators supply metering data and assign feed-ins and withdrawals to the correct balancing groups. Incorrect master data, late meter readings or unclear assignments can have financial consequences even if no wrong procurement decision lies behind them. For this reason, the rules oblige balance responsible parties to review the transmitted data. Balance responsibility is thus also a question of data quality.

Economic assessment

Economically, balance responsibility serves to allocate costs. No market participant should use the overall system as a free safety net for its forecast errors while keeping the profits from its transactions. At the same time, the system must not hold back flexibility. If imbalance settlement prices, trading deadlines or data processes are poorly designed, participants either have too little incentive to correct or bear disproportionate risks. This can disadvantage small providers and new business models. The design therefore affects competition, direct marketing, aggregation, storage operation and the integration of decentralised installations.

Balance responsibility is thus not a single technical measure but a central ordering rule of the electricity market. It determines who is responsible for deviations between scheduled and actual electricity volumes, how these are settled and which incentives arise for forecasting, procurement and short-term correction. A stable power system therefore needs, in addition to sufficient generation and high-performing grids, reliable rules that connect physical scarcity, economic action and clear responsibilities.

Sources

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Edited by eCMS on 11.11.2026 15:49

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