Co-location BESS with 55 MWh supports energy transition in Föhren

In Föhren, Rhineland-Palatinate, SCHOENERGIE is implementing an innovative combination of photovoltaic and battery storage. The 21 MW / 55 MWh battery storage system is directly coupled with a 17 MW PV plant and is connected to the grid via a 20 kV medium-voltage interface.

Since October 2025, Entelios has been trading the system across various short-term electricity markets (FCR, aFRR, Day-Ahead, Intraday), ensuring optimal revenue generation. The project also uses our Cross-Market Optimisation, which has been specifically designed for co-located systems. The battery storage unit is operated in Amprion’s grid zone and delivers important system services. In addition to its commercial applications, the battery is also contributing to the SUREVIVE research project, which is investigating the potential of grid-forming assets to play a pivotal role in ensuring future grid stability. Further information is available at www.surevive.energy.

The project stands out for its grid-stabilizing capabilities: Thanks to grid-forming inverters, it provides critical services such as black start capability, inertia, frequency and voltage regulation, and reactive power – without relying on any fossil-fueled backup capacity. For this, the project was named a Top Innovation by the trade journal pv magazine in 2025.