EnBW plans to develop a 400MW/800MWh battery energy storage system at its Philippsburg Energy Park site in southwest Germany.
The project would become one of the largest battery systems in the country and is designed to absorb excess electricity from renewable sources and release it back into the grid when needed.
EnBW said the installation would be capable of meeting the daily electricity needs of around 100,000 households.
The storage system will be located alongside the ultranet converter station built by transmission system operator TransnetBW, which brings wind power from northern Germany to the south via a high-voltage direct current link.
“The weather-dependent generation capacity of renewables must be balanced with actual electricity demand from households, commerce and industry,” said Peter Heydecker, EnBW board member for sustainable generation infrastructure.
“Battery storage and hydrogen-ready gas-fired plants provide the flexibility we need in the system.”
Philippsburg mayor Stefan Martus said: “Philippsburg has been one of the most important energy locations in the whole of Germany for half a century – and our municipality should continue to play this outstanding role in the future: as an anchor point and huge storage facility for sustainable power generation.”
The battery project is expected to be financed through electricity market revenues and grid services, without state subsidies.
EnBW said existing grid infrastructure at the site makes it a suitable location and simplifies development compared with a greenfield alternative.
TransnetBW is scheduled to provide the grid connection with full injection and withdrawal capacity by mid-2027.
EnBW said the project remains in its early stages, with a final investment decision and planning approval still pending.
If approved, commissioning could take place by the end of 2027.