Local and federal officials marked the start of construction for Germany’s largest battery storage facility with a ceremonial groundbreaking in Förderstedt, a district of Staßfurt, Saxony-Anhalt. ECO POWER THREE GmbH, a subsidiary of ECO STOR GmbH, will develop the 300-megawatt project with more than 700 megawatt-hours of capacity. Once operational, the storage system will be capable of delivering power to roughly 500,000 households for two hours, supporting grid stability and security of supply.
Prof. Dr. Armin Willingmann, Minister for Science, Energy, Climate Protection and Environment of Saxony-Anhalt; Urban Windelen, Federal Managing Director of the German Federal Association of Energy Storage Systems (BVES); Bernd Schneider from transmission system operator 50Hertz; Staßfurt Mayor René Zok; and ECO STOR CEO Georg Gallmetzer participated in the ceremony.
With a modular design comprising three independently operable blocks, the facility permits staged commissioning for efficient project rollout. Preparatory site work began in July 2025, and core construction is now underway on the roughly eight-hectare campus. The system will integrate a 110-kilovolt substation, transformers, inverters, and lithium-ion battery modules.
Privately financed without public subsidies, the project is backed by investors Nature Infrastructure Capital (NIC) and X-ELIO. Staßfurt stands to receive 90 percent of local business tax revenues generated by the installation. ECO STOR previously commissioned a 100-megawatt storage site in Bollingstedt, Schleswig-Holstein, in June 2025.
“We see energy storage systems not only as technical systems, but also as a key technology for the energy transition,” explains Georg Gallmetzer, Managing Director of ECO STOR. “Our storage systems make the electricity system more flexible, more stable and more sustainable. They are the missing building block for fully integrating renewable energies and ensuring security of supply in line with the grid.”
Stefan Kapferer, Chairman of the Management Board of 50Hertz: “For us as a transmission system operator, high-performance large-scale storage systems at grid-serving locations are an important building block for keeping the power grid stable and flexible. The very good cooperation with ECO STOR in Förderstedt shows how technological innovation and network practice can go hand in hand. Such storage systems can make a significant contribution to balancing the fluctuating feed-in from renewable energies and are therefore central to a secure, modern energy system in eastern Germany and beyond.”
René Zok, Mayor of the City of Staßfurt: “We are pleased that ECO STOR is investing in Staßfurt with this major project and thus sending a strong signal for sustainable development and regional value creation. The battery storage system in Förderstedt not only strengthens the energy transition, but also the business location and the municipality itself. This project combines future technology with responsibility for the region and is exactly what we need for a successful transformation.”
Source: ECO STOR GmbH
