Groundbreaking in Balzhausen: green flexibility is building an 80 MWh battery storage system as part of LEW Verteilnetz’s pilot project “Feed-In Socket".

Kempten/Balzhausen, September 11, 2025

Just a few months after successfully securing the contract in the “Feed-In Socket” pilot project, construction work on the battery storage system in Balzhausen has officially begun. With today’s groundbreaking ceremony, green flexibility and LEW Verteilnetz GmbH (LVN) are jointly launching an innovative project that sets new standards for the grid-neutral integration of large-scale battery storage systems.

The storage system, with an output of 40 megawatts (MW) and a capacity of 80 megawatt-hours (MWh), is scheduled to go into operation as early as the beginning of 2026. With an investment of around 40 million euros, the plant will help improve regional supply security and actively support the energy transition.

Grid neutrality as a key principle

The unique feature of the project lies in the close cooperation between the grid operator and the storage operator. As part of the “Feed-In Socket,” the battery storage system will be operated in a grid-neutral manner: this means that LVN can temporarily reduce the storage system’s feed-in power during certain grid situations to prevent bottlenecks in the electricity network.

“With the start of construction in Balzhausen, we are demonstrating how quickly innovative concepts can be put into practice. Grid operators and storage operators are working hand in hand here - a model with exemplary character for the further expansion of battery storage systems in Germany,” says Christoph Lienert, co-founder and managing director of green flexibility.

Contribution to stability and integration of renewable energy

The large-scale storage system in Balzhausen will balance fluctuations in power generation in the future: it stores excess energy when electricity production is high and feeds it back into the grid when demand increases. In doing so, the facility stabilizes the energy system, supports the integration of solar and wind power, and strengthens supply security.

“The energy transition needs speed - and that’s exactly what our ‘Feed-In Socket’ pilot project demonstrates, which has created additional grid connection capacity in record time. The fact that green flexibility, as one of the connection users of the Feed-In Socket, is keeping pace with us underscores our practical and solution-oriented collaboration. At the same time, we are showing how grids, generation plants, and storage systems can work together optimally, thereby making an important contribution to a secure and sustainable energy supply,” adds Barbara Plura, asset manager and technical grid planner at LEW Verteilnetz.

Next steps

Following today’s groundbreaking ceremony, the construction site setup and the installation of infrastructure for the battery containers will begin. The ceremonial commissioning of the “Feed-In Socket” is already scheduled for October 20, before the full commissioning of the large-scale storage system takes place at the beginning of 2026.

About LEW Verteilnetz GmbH (LVN)

LEW Verteilnetz GmbH (LVN), a subsidiary of Lechwerke AG, operates one of the largest regional electricity distribution networks in Bavaria. With around 36,000 kilometers of power lines, LVN ensures the reliable supply of electricity to around one million people and businesses in Bavarian Swabia and parts of Upper Bavaria. As an innovative grid operator, LVN is actively driving the expansion and digitalization of the grid infrastructure, making a key contribution to the energy transition and the secure integration of renewable energy sources.

Press photos

Visualization of the Balzhausen project: Link

Photo Groundbreaking ceremony with project manager Klaus Nüssel, green flexibility; Barbara Plura, asset manager and technical grid planner at LEW Verteilnetz; and Christoph Lienert, COO & co-founder of green flexibility.

Photo Collaborative exchange between LEW Verteilnetz and green flexibility