German battery storage and fast-charging specialist ADS-TEC Energy is closing in on a building permit for a planned 1 GW / 4 GWh battery energy storage system (BESS) in southern Germany.
Local permitting authorities have confirmed that all application documents for the four-hour duration facility, located at the Pulverdingen substation in Markgröningen, Baden-Württemberg, are now complete. Grid connection for the project is targeted for 2029.
When ADS-TEC first announced this project in southern Germany in September 2025, it was then scoped at 1 GW / 2 GWh and a location was not made public. With the project doubling the capacity to 4 GWh in just over a year, the rapid shift in the German utility-scale market is clear. ESS News confirmed the capacity sizing details with a representative from ADS-TEC.
The total investment is in the range of several hundred million to one billion euros, and the Nasdaq-listed firm said it is in advanced talks with international infrastructure investors and European energy firms to sell a majority stake in the project company.
Once the building permit is issued, ADS-TEC Energy expects to finalize financing and partnership agreements, staying on as a minority shareholder, technology provider, and long-term service operator.
This model, with attached tech and O&M tie-ins, would de-risk the asset, while likely tying on for the long-term revenues from hardware and servies. The company said it plans to equip the facility with its proprietary, in-house battery management system (BMS), electrical switchgear, and transformers sourced from European industrial partners. The company emphasized that keeping electronics and software under local control reduces reliance on Asian BMS suppliers and tightens IT and data security for critical grid infrastructure. It also plans to use the facility for electricity trading and for providing ancillary services.
The company noted that third-party market data shows large-scale BESS installations in Germany recently achieving annual revenues between €150,000 and €250,000 per 1 MW through wholesale trading and balancing markets. Still, the industry understands that ancillary service markets face cannibalization through 2029 and long-term bankability requires a revenue stack across day-ahead, intra day, and even tolled revenues.
“A project of this size requires staying power,” said Thomas Speidel, founder and CEO of ADS-TEC Energy. “With our own technology and renowned European partners, we are demonstrating that Europe can plan, build and operate critical energy infrastructure on this scale on its own.”
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