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Even with the best planning and last-minute adjustments through the intraday market, the real world does not always go according to plan. This leads to a crucial concept in energy markets: Imbalance.

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What Is Imbalance?

Imbalance occurs when there is a deviation between the amount of electricity a participant plans to inject or withdraw and the amount they actually inject or withdraw, averaged over a 15-minute settlement period. The TSOs expect all market participants to stick to their submitted schedules as closely as possible. Any deviation — producing more or less than planned, or consuming more or less than contracted — creates imbalance.

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How Does Imbalance Happen?

Even diligent participants can run into imbalance due to factors outside their control:
  • Post-trading weather changes: The weather can shift after the intraday market closes (30 minutes before delivery), causing wind farms or solar plants to generate more or less than committed.
  • Unavailabilities and outages: Equipment failures or unexpected maintenance can cause a site to suddenly produce or consume less than planned.
  • Sudden demand shifts: Large, unpredictable changes in overall energy consumption can contribute to systemic imbalance.

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The Consequences of Imbalance

Running into imbalance has serious financial and reputational consequences:
  • Financial impact: For any imbalance, participants either pay or receive the reBAP price (Regelbilanzierungsenergiepreis), which the TSOs calculate for each 15-minute period. This price is designed to cover the cost to the TSO of procuring backup balancing services. The reBAP price can be very high, turning what might have been a profitable market position into a significant loss.
  • Reputational impact: TSOs closely monitor all market participants. Repeated or large imbalances signal operational issues and can lead to increased scrutiny and a damaged reputation in the energy market.

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Varying Treatment by Participant Type

  • Renewables: Due to their inherent unpredictability, renewable generators are given some leniency. It is understood that their output cannot always match forecasts perfectly.
  • Energy traders: For traders who do not own physical generation or consumption infrastructure, imbalance is treated very strictly. They are expected to manage their positions purely through market trades.

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Why Strictness Is Necessary

Every instance of imbalance puts strain on the grid’s delicate balance. If too many participants are out of balance simultaneously, the TSO must work harder and use more expensive emergency services (including ancillary services) to maintain stability.
Deliberately creating an imbalance position to profit from the reBAP price is illegal in Germany. This practice — called “imbalance trading” — involves intentionally opening a market position without intending to deliver what was promised, hoping to profit from the difference between the intraday price and the eventual reBAP settlement. The TSO enforces the legal obligation to minimise imbalance very strictly.
Last modified on April 20, 2026