LEAG builds GigaBattery storage facility in Saxony

At the former coal power site in Boxberg, Saxony, energy company LEAG is preparing to build one of Germany’s largest battery storage facilities. The project, called GigaBattery Boxberg 400, will cover roughly six hectares, an area where cooling towers once stood before their demolition last year. The storage system is designed to deliver 400 megawatts of power and hold up to 1,600 megawatt-hours of electricity, enough to supply around 640,000 households for a few hours.

The battery units will use lithium-iron-phosphate technology provided and integrated by the energy-storage company HyperStrong, while Siemens Energy will supply the high-voltage switchgear needed to connect the facility to the 380-kilovolt grid. LEAG views Boxberg, along with its similar project in Jänschwalde, as a key building block of its long-term plan to expand renewable energy and storage capacity under its “GigawattFactory” strategy.

Jänschwalde: The first GigaBattery of the Lausitz

The transformation began in Brandenburg (near Berlin), where LEAG and Fluence Energy signed the delivery contract for the GigaBattery Jänschwalde 1000. With 1,000 MW of power and 4,000 MWh of storage capacity, it will be one of Europe’s largest energy storage systems. Once operational, it will be able to supply the equivalent electricity demand of more than 1.6 million households for four hours, significantly improving grid stability in a region undergoing structural change.

Building the GigawattFactory

Both projects are part of LEAG’s long-term strategy to build an integrated energy system that combines renewable generation, large-scale storage, and flexible, hydrogen-ready power plants. As former coal sites evolve into hubs for clean-energy infrastructure, the Lausitz and Saxony projects highlight how structural change can be turned into an opportunity for regional innovation and Europe’s broader energy transition.