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Largest battery energy storage system in Southern Swabia: green flexibility builds 90 MWh grid-connected facility in Obergünzburg

green flexibility sets another milestone in the energy transition with a new battery storage project in Obergünzburg, constructing the largest battery energy storage system (BESS) in the Swabia region to date, with 40 MW of power and 90 MWh of storage capacity. The investment amounts to approximately 35 million euros. Commissioning is planned for the end of 2026.


Kempten/Obergünzburg, 07.04.2025


With the growing feed-in of photovoltaic and wind power into the grid, the demand for flexible large-scale storage systems is increasing – systems that can absorb surplus electricity and feed it back into the grid as needed. The Obergünzburg BESS fulfills precisely this function by reducing load peaks and contributing to the stability of the regional electricity grid. It stores excess renewable energy and releases it in a controlled manner, thereby increasing grid flexibility.


A key step for grid stability and supply security


In addition to the classic applications of battery storage, this project includes an additional grid-neutral mode of operation within the regional electricity grid. This ensures that the storage system responds not only to national market signals but actively supports the stabilization of local grid infrastructure.


The Obergünzburg project is a further example of green flexibility’s strategy: implementing innovative, grid-supportive storage solutions at strategically relevant locations – in close cooperation with local grid operators.


Technologically advanced high-voltage project


The project is a high-voltage installation featuring its own dedicated substation. By connecting directly to the high-voltage grid, it ensures a particularly robust and high-capacity integration into the power system, with an output capacity of 40 MW.


With construction set to begin in the coming months and commissioning scheduled for the end of 2026, the project will make a significant contribution to secure and sustainable energy supply in the region.


Quotes from project stakeholders:

“In our municipality, the expansion of renewable energy will continue. As we already generate more electricity than we consume, it is only logical and necessary to establish storage capacity. For that, we need grid-scale battery systems. With green flexibility’s project, we have created not only an economic but also a future-oriented solution for grid stability in Obergünzburg – with positive effects far beyond our municipal boundaries.” – Lars Leveringhaus, Mayor of Obergünzburg.
“Significant investments in photovoltaic and wind energy have been made around Obergünzburg in recent years – and the expansion continues. The scale of our battery storage system highlights a clear fact: powerful storage is essential at these grid nodes. The energy transition cannot succeed without them – they are a core element of a stable and future-ready electricity system.” – Christoph Lienert, Co-Founder and Managing Director of green flexibility.

On-site meeting with finance officer Christoph Brenner, Mayor Lars Leveringhaus of Obergünzburg, and Christoph Lienert Co-founder and Managing Director of green flexibility
On-site meeting with finance officer Christoph Brenner, Mayor Lars Leveringhaus of Obergünzburg, and Christoph Lienert Co-founder and Managing Director of green flexibility


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