Less than two months after the investment firm TIVEN’s family office took ownership, sonnen GmbH has reportedly filed for insolvency. The decision will affect nearly 400 employees at the German residential energy storage system (ESS) manufacturer and supplier. Meanwhile, sonnen USA has announced plans to expand.
German business daily said the company has confirmed the development, saying that the German battery company officially filed for insolvency on October 22, 2026. It plans to liquidate several of its subsidiaries or place them under self-administered insolvency. According to the report, the German manufacturer had been ‘burning through money like crazy’.
sonnen GmbH will continue to operate a single production site while…