Batteries offer a high degree of flexibility. They support the integration of volatile electricity production from renewable energies into the energy system. Thanks to rapid charging and discharging, they create a buffer between electricity generation and consumption within seconds. If more electricity is available than is needed, the storage facilities are charged. This "reserve" can be flexibly accessed during periods of low electricity generation and high demand. At our sites, we combine large storage facilities with existing infrastructure and modern control systems.
In 2025, LEAG Clean Power launched two GigaBattery projects with a combined output of 1,400 MW and a storage capacity of 5,600 MWh. These projects will set new milestones in the use of battery storage technologies. LEAG's first large-scale battery – the BigBattery Lausitz – went into operation in 2020 as Germany's largest battery storage facility at the time. The plant, with 54 MWh of usable storage capacity, is located at the Schwarze Pumpe energy site in southern Brandenburg. A second BigBattery with a storage capacity of 137 MWh is currently being built at the Boxberg site in the Oberlausitz region, Saxony.
Gigawatt-scale storage
We are working on multiplying storage capacity in LEAG's portfolio. Our goal is to combine different storage locations into one of the largest modular battery parks in Germany and Europe.
Battery storage systems are versatile: they stabilise the power grid in a matter of seconds (control energy) and balance out peaks in generation and demand throughout the day. In this way, they not only buffer volatile feed-in, but also contribute to stabilising electricity prices. Installed decentrally at grid feed-in points, they can smooth out fluctuations in solar and wind power directly on site – without overloading grid capacities. Our storage concepts cover all of the above-mentioned applications.
In the short and medium term, we are focusing on lithium-based battery modules as the commercially available industry standard for flexible, powerful storage solutions with fast control response and high energy density. At the same time, we are closely monitoring the development of new storage technologies. Important criteria for their use are technological maturity, guaranteed availability and high scalability of the storage units.
Support from the EU
The planned construction of the GigaBattery Boxberg 400 is receiving funding from the European Union's Just Transition Fund (JTF). This funding instrument is designed to support the areas of the EU most affected by the transition to climate neutrality and to prevent an increase in regional inequalities.