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green flexibility connects Bavaria’s largest utility-scale battery storage system to the grid – Germany’s first grid-neutral facility

green flexibility and Allgäuer Überlandwerk have officially inaugurated Bavaria’s largest battery storage facility to date. The site in Immenstadt delivers a power output of 15 MW and a storage capacity of 33 MWh, making it the first grid-neutral battery storage system in Germany.


Kempten/Immenstadt, July 3, 2025


As the expansion of photovoltaic and wind power continues to grow, so does the need for high-performance storage solutions that can flexibly absorb renewable energy and feed it back into the grid when needed. The new battery storage system in Immenstadt meets exactly this requirement  – and sets new standards: As Germany’s first grid-neutral large-scale battery storage system, it enhances security of supply without putting additional strain on the regional grid.


Completed Ahead of Schedule


The construction of the 15 MW, 33 MWh storage system was not only seamless but was also completed ahead of schedule. All technical interfaces were successfully installed, thoroughly tested, and brought online without issues. This project success was made possible through the professional collaboration between the project partners Allgäuer Überlandwerk (AÜW), green flexibility, and numerous service providers. In total, around €15 million was invested in the project.


Robust Grids Through “REGIOlink”


A particular innovation of this storage system is its grid-neutral operating concept. The „REGIOlink“concept, developed by green flexibility, ensures that the storage system responds not only to national market price signals but also actively supports regional grid stability. In close coordination with the grid operator AllgäuNetz, the system was specifically adapted to meet local requirements.


With this, Immenstadt becomes a pioneer for a new generation of battery storage systems that efficiently integrate renewable energy and address the challenges of decentralized power supply  – an important milestone on the path to a successful energy transition.

 

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Statements from Project Partners:

“Our recipe for the energy future in the Allgäu: strong partners, future-proof technology. This storage project is just the beginning – more will follow.” – Michael Lucke, CEO of Allgäuer Überlandwerke (AÜW).


“With the storage system in Immenstadt, we demonstrate how modern energy storage must be conceived today: regionally coordinated, grid-supportive, and economically viable. Its grid neutrality makes this facility a model for a new generation of storage systems in Germany – and we are proud to have delivered this milestone ahead of schedule together with AÜW.” – Christoph Ostermann, Co-Founder and CEO of green flexibility.


TV Feature on Bayrischer Rundfunk:



Event Highlights Video:



Photo Gallery of the Opening Ceremony:


 

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