EnBW has approved the final investment decision for a 400 MW / 800 MWh battery energy storage system at Philippsburg Energy Park in Germany. The facility positioned beside the TransnetBW converter station for the ULTRANET DC link and is progressing without government subsidies. Construction is planned for early summer 2026, with operations by late 2027. The BESS will serve around 100,000 homes and supports EnBW’s broader renewable and coal phase-out strategy.
PROJECT SNAPSHOT
Germany-based vertically integrated energy company, EnBW Energie Baden-Württemberg AG has approved the final investment decision for a 400 MW / 800 MWh battery energy storage system at the Philippsburg Energy Park in Germany. The facility is located beside the TransnetBW converter station and is progressing without government subsidies.
Philippsburg already hosts significant energy infrastructure. The site previously housed two nuclear power units, which have been under dismantling since 2017 and 2020. TransnetBW, the electricity Transmission System Operator, has built a large direct-current converter for the ULTRANET DC link to transfer wind power from northern Germany to the southwest of the country.
According to the company, construction is planned to begin in early summer 2026, with operation expected by the end of 2027, and the BESS is designed to supply the equivalent electricity demand of about 100,000 homes. The project is to be financed through revenues generated from electricity sales and grid services.
EnBW employs around 30,000 people and supplies energy to about 5.5 million customers. The company operates across generation, trading, grid management, and energy sales. The company’s strategy focuses on growing its renewable portfolio and developing electricity, gas and hydrogen networks, with planned investments of up to €50 billion by 2030. The company targets an 80% share of renewable energy in its generation mix by 2030 and is preparing to phase out coal by 2028, subject to operational factors.
Peter Heydecker, COO for Sustainable Generation Infrastructure at EnBW, said the decision supported system flexibility by balancing variable generation and demand while complementing hydrogen-ready gas plants and strengthening Philippsburg’s energy role.