German Battery Maker Sonnen Files for Insolvency Months After Shell Sale
Sonnen GmbH, the German home-battery maker once owned by Shell, has filed for insolvency, Handelsblatt reported, with roughly 400 remaining employees told of the filing on a Thursday morning, according to pv magazine’s account of the German business daily’s reporting.
A Quick Reversal After Changing Hands
The filing comes only months after Shell completed the sale of Sonnen to family office Tiven, following what pv magazine described as a prolonged search for a buyer. Numerous Sonnen subsidiaries are now expected to be liquidated or placed into self-administered insolvency proceedings, Handelsblatt reported, with only one production facility — based in Wildpoldsried, in Germany’s Allgäu region — expected to keep operating. No official notice had yet appeared in Germany’s insolvency register at the time of reporting, and Sonnen did not respond to pv magazine’s requests for comment.
Sonnen says it intends to keep serving its existing base of more than 150,000 customers despite the restructuring, though it has not detailed how reduced staffing and a shrinking manufacturing footprint will affect service and warranty support going forward. As recently as late August, Franc Comino, managing director of Sonnen’s Spanish unit, told pv magazine the company expected to keep operating there, a sign that the group’s international units may be assessed separately from the German insolvency filing.
A Rough Patch for Home Battery Makers
Sonnen’s troubles land amid a broader reset in Europe’s residential battery storage market, where falling subsidy support in some markets and intensifying competition from lower-cost Asian manufacturers have squeezed margins for established Western brands. The company’s difficulties also raise questions about how strategic buyers value stand-alone storage makers once a deep-pocketed parent like Shell exits: state-backed and utility-linked storage ventures, such as Rosatom’s new lithium-ion plant in Egypt, have continued attracting fresh capital even as independent consumer-facing brands struggle. In the US, by contrast, utility-scale procurement programmes such as Maryland’s 440 MW battery storage award show demand for grid-scale storage remains robust, suggesting the pressure on Sonnen is concentrated in the residential segment rather than storage broadly.
Sources
- pv magazine, “Sonnen files for insolvency,” October 22, 2026, citing Handelsblatt’s reporting — employee numbers, ownership history and company statements.
Illustrative image. Photo: Kecko from Eastern Switzerland, CC BY 2.0, via Wikimedia Commons — source
