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Large-scale battery to provide targeted relief for grid bottlenecks

Pilot project in Bavaria: For the first time, a grid-serving battery storage system is being installed directly at a distribution grid operator in Germany - a milestone for the energy transition.

17.07.2025

Source: E & M powernews

Bayernwerk Netz and "MaxSolar" are implementing a grid-serving storage system in eastern Bavaria for the first time at a distribution grid operator in Germany.

Bayernwerk Netz GmbH, part of the Eon Group, will be the first distribution grid operator in Germany to connect a grid-serving storage system. The company announced this on July 17. Bayernwerk Netz and the general contractor Max Solar have signed a service contract for the first grid-serving battery storage system. The project is to be implemented in Wutzldorf in the district of Cham (Upper Palatinate) after Max Solar was awarded the contract in a tender by the Federal Network Agency.

Max Solar is to operate the 5 MW storage system with a capacity of 25,000 kWh for the entire term of the contract. The plan is to charge the storage system when the solar power feed-in is high and discharge it when the grid load is high. According to the contractual partners, the mode of operation is based on the daily and seasonal requirements of the grid operator. "This heralds a new phase in the integration of large-scale batteries into the power supply system," said Nick Seeger, Managing Director of Bayernwerk Netz.

The storage system will be used to stabilize the grid in heavily loaded regions. Bayernwerk Netz is thus pursuing the goal of relieving the grid infrastructure in a more targeted manner without having to expand it. The measure is intended to reduce grid bottlenecks and limit voltage fluctuations. "With the grid-serving storage system, we are providing an important impetus for the efficient use of renewable energies and for ensuring a stable and sustainable energy supply in the long term," said Christoph Strasser, Managing Director of Max Solar.

Further storage locations to follow

According to Bayernwerk, the grid-friendly operation of storage systems at certain locations is faster and cheaper than the physical expansion of the grid. The flexibility of such storage systems makes it possible to absorb more generation capacity without overloading the grid beyond existing capacities.

The findings from the pilot project in Wutzldorf will be incorporated into future tenders. Bayernwerk is already preparing further locations for the use of grid-serving storage systems. Tenders are also planned for these projects, which will be based on the previous procedure.

Author: Heidi Roider