Eco Stor plans 716 MWh battery storage system in Germany

Eco Stor has unveiled plans for its largest battery energy storage system to date in capacity terms. The German-Norwegian developer aims to build a 300 MW/716 MWh standalone battery storage facility in the municipality of Trossingen in southwestern Germany.

The construction is scheduled to begin mid-2027, the company announced earlier this week. The commissioning date is pencilled in for 2028.

With the latest announcement, Eco Stor’s pipeline in Germany has crossed a 2 GWh mark. Namely, the company now has 2,392 MWh of storage capacity in various stages of planning across Germany, which come on top of 108 MWh for its operational project fleet.

Previously, the company unveiled plans for the 103 MW/238 MWh Bollingstedt, the 103 MW/238 MWh Schuby, the 300 MW/600 MWh Wengerohr, and the 300 MW/600 MWh Förderstedt projects.

The first three projects broke ground earlier this year. Wengerohr will start construction by the year’s end at the earliest, while Förderstedt is expected to break ground in 2027.

The company’s latest project, the Trossingen battery storage facility, will be built in the immediate proximity to a 110 kV grid connection and with a “sufficient distance from residential areas to keep noise pollution as low as possible,” the developer said.

Once delivered, the system will feature 1,536 battery cabinets and charge and discharge twice a day. “The large battery storage facility actively contributes to security of supply and thus increases the attractiveness of Trossingen as a business location,” reads the company website.

Eco Stor has been one of the most vociferous in advocating for new regulations that would allow for 90% of trade tax revenue from energy storage systems in Germany to go into the pockets of local municipalities, potentially opening the doors to greater community acceptance.  

The new rules, which would mirror the regulations applying to photovoltaic power plants and wind farms since 2021, are currently being discussed in the parliamentary committees and in the Federal Ministry of Finance.