The German-Norwegian company Eco Stor and the project developer for large-scale storage systems EPW GmbH have now officially inaugurated Germany’s largest battery storage system. The storage facility, which went online in April in Bollingstedt, Schleswig-Holstein, has a capacity of 103.5 megawatts (MW) and a storage capacity of 238 megawatt hours (MWh). This means that around 170,000 households can be supplied with renewable electricity for two hours each.
The Bollingstedt plant consists of 64 containers holding lithium-ion batteries, as well as 32 containers housing inverters and transformers. The facility uses surplus wind and solar energy production and feeds the renewable electricity back into the SH Netz AG power grid during morning and evening peak demand periods. In addition, Eco Stor uses a proprietary digital network twin to calculate signals indicating when it is unfavourable to store or retrieve energy, thus acting in the interests of the network and system for the greater good.
According to Eco Stor’s calculations, if the Bollingstedt battery storage facility had been connected to the grid during the dark doldrums in the early evening of 12 December 2024, the price on the German electricity market would have fallen by 36 euros per MWh. Minus the prices for charging during the preceding night, the German economy could have saved around one million euros in electricity costs during this one hour alone.
Eco Stor will soon celebrate the inauguration of its next facility. In the neighbouring municipality of Schuby, the company is currently constructing a battery storage system with the same output and capacity as the one in Bollingstedt.
© PHOTON
