Germany: German-Norwegian storage specialist Eco Stor has reached a major milestone in its 103.5-MW/238-MWh battery energy storage project in Schuby, northern Germany. The company has confirmed delivery of the main transformer, a unit weighing nearly 130 t and serving as the heaviest single component of the future facility.
Transported from Hungary, the transformer will convert 110 kV down to 30 kV and back again, ensuring secure integration with the grid. Alongside it, several smaller transformers will step down electricity further to 690 V, the level required for battery operation.
Construction of the storage site began in February 2025. Once complete, the project will include 64 containers housing lithium-ion batteries and 32 containers dedicated to inverters and transformers. Spanning 1.2 ha, the facility will play a central role in storing surplus renewable energy, particularly from wind and solar generation.
The Schuby system is designed to discharge during peak demand hours in the morning and evening, helping balance grid loads and stabilise electricity supply. At full output, it will provide renewable electricity for around 170,000 multi-person households for two hours.
Scheduled to go online in early 2026, the Schuby installation follows the commissioning of a similar 103-MW/238-MWh battery project in Bollingstedt, also in northern Germany. Together, these large-scale storage facilities underline Eco Stor’s commitment to strengthening renewable integration and advancing Germany’s energy transition.
By delivering this critical transformer, Eco Stor moves one step closer to realising one of Germany’s largest grid-scale battery energy storage systems.
Source: Renewables Now
