Switzerland unveils underground flow battery capable of powering 210,000 homes for a day

Engineers in Switzerland have completed a large underground flow battery installation. The facility is designed to store renewable energy on a massive scale. It can deliver enough power to supply roughly 210,000 homes for a full day. The battery operates without the need for continuous lighting or external power. Its underground placement helps reduce land use and visual impact. The project demonstrates a practical approach to grid‑scale energy storage. It aims to support Switzerland’s transition to cleaner electricity sources. Industry analysts will monitor the battery’s performance as a model for future projects.