Groundbreaking for the currently largest grid-neutral battery storage system in Southern Swabia: green flexibility begins construction of the 90 MWh battery storage facility in Obergünzburg

Kempten/Obergünzburg, December 22, 2025

With the official groundbreaking ceremony, green flexibility has commenced construction of the currently largest grid-neutral battery energy storage system in Southern Swabia, ahead of the original schedule. Over the coming months, a battery storage park with an output of 40 MW and a capacity of 90 MWh will be developed at the project site in Obergünzburg. The facility will make a significant contribution to grid stability, security of supply, and the continued integration of renewable energy sources in the region. Commissioning is scheduled for the end of 2026, with a total investment volume of approximately EUR 35 million.

To mark the groundbreaking, green flexibility welcomed numerous representatives from local government, grid operators, and the media. Local residents also took the opportunity to learn more about the project on site.

Milestone for Grid Stability and the Energy Transition

Christoph Lienert, Managing Director and Co-Founder of green flexibility, emphasized in his welcoming remarks the importance of partnership-based collaboration for the project:

“Today’s groundbreaking marks the result of a close and trust-based cooperation with the municipality, regional stakeholders, and the responsible grid operator. From the outset, our objective has been to jointly implement a project that integrates seamlessly into the local infrastructure and delivers sustainable added value for Obergünzburg and the wider region.”

During his address, Mayor Lars Leveringhaus highlighted the unique position of the municipality of Obergünzburg, which already generates more electricity from renewable energy sources than is consumed locally:

“To make effective use of this energy, high-performance storage capacity is essential. The battery storage facility developed by green flexibility therefore represents an economically viable and forward-looking solution that relieves pressure on the grid and delivers positive impacts well beyond the municipal boundaries.”

District Administrator Maria Rita Zinnecker also placed the project within a broader regional context. She emphasized that grid-neutral large-scale battery storage facilities such as the one in Obergünzburg are a key building block for advancing the energy transition in rural areas:

“Such facilities enhance security of supply and grid stability and, over the medium term, can help reduce electricity prices.”

Grid-Neutral Battery Storage as a Core Component of the Regional Energy Infrastructure

A particularly innovative feature of the project is the grid-neutral operating approach of the battery storage system. The “REGIOlink” concept, developed by green flexibility, ensures that the storage facility does not respond solely to national market price signals, but actively contributes to regional grid stability. In close coordination with the grid operator, the system has been specifically tailored to local requirements. A successful energy transition can only be achieved through collaboration.

Presse-Bilder

Photo of Christoph Lienert, COO & Co-Founder, green flexibility

Photo of the project planning in Obergünzburg

Photo of an existing facility in Immenstadt, scheduled to commence operations in June