EnBW Energie Baden-Württemberg AG has made the final investment decision for a planned battery energy storage system (BESS) at Philippsburg Energy Park. The facility will have a power capacity of 400 megawatts and an energy capacity of 800 megawatt-hours, making it one of the largest battery storage facilities in Germany.

The project will be built without any government subsidies and is scheduled to begin construction in early summer 2026, with operations expected to commence by the end of 2027. The BESS will be financed through revenues from electricity sales and grid services that ensure reliable grid operation and guaranteed electricity supplies.

Strategic Location and Infrastructure Integration

The battery storage facility will be constructed at Philippsburg Energy Park, on a site adjacent to the TransnetBW converter station. Philippsburg is also home to two nuclear power units that have been undergoing dismantling since 2017 and 2020, respectively.

Transmission system operator TransnetBW has already built a large direct-current converter in an adjacent section of the energy park. As part of the new ULTRANET DC link, the converter will bring wind power from northern Germany to the southwest of the country.

Energy System Flexibility and Grid Balancing

According to Peter Heydecker, Chief Operating Officer for Sustainable Generation Infrastructure at EnBW, the investment decision represents a key step in making the energy system more flexible. Battery energy storage systems are described as indispensable for balancing the fluctuating supply of wind and solar power with actual electricity demand.

The BESS is positioned as an ideal complement to hydrogen-ready gas-fired power plants, which are intended for longer deployments. The investment is expected to boost Philippsburg as a key energy hub. The facility will have the capacity to provide enough electricity to power around 100,000 homes.

Company Profile and Strategic Direction

EnBW employs approximately 30,000 people and is recognized as one of the largest energy supply companies in Germany and Europe. The company provides energy to some 5.5 million customers. It serves all stages of the value chain, from generation and trading to grid operation and the sale of electricity, heat energy, and gas.

The company is undergoing a transformation from a traditional energy provider to a sustainable infrastructure group. The expansion of renewable energy sources and of the distribution and transportation grids for electricity and gas, including hydrogen, is described as a cornerstone of EnBW's growth strategy and the focus of its investment spending.

EnBW plans to invest up to EUR 50 billion by 2030, with around 85 percent of this investment planned for Germany. By 2030, renewables are intended to account for around 80% of the EnBW generation portfolio. The company plans to phase out coal by the end of 2028, provided conditions allow. These developments are positioned as key milestones toward achieving net zero for the company's own greenhouse gas emissions by 2040.

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