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German battery storage maker Sonnen has filed for insolvency, according to Handelsblatt, months after Shell sold it to family office Tiven. Sonnen plans to keep serving more than 150,000 customers, while several subsidiaries may enter insolvency proceedings or be liquidated. The filing’s full scope and the future of the company’s operations remain unclear.
German battery storage manufacturer Sonnen has filed for insolvency, months after Shell sold the company to family office Tiven, according to German business daily Handelsblatt. The company plans to continue serving its more than 150,000 customers, while several subsidiaries are expected to be liquidated or placed into insolvency proceedings under self-administration.
Handelsblatt reported that about 400 remaining employees at Sonnen GmbH were informed of the filing on Thursday morning. The company confirmed the proceedings to the newspaper, but an official notice had not appeared in the insolvency register when the report was published. Sonnen did not respond to a request for comment from pv magazine.
According to Handelsblatt, the company intends to keep serving its existing customer base as it addresses its financial position. The report said only one production facility is expected to remain operational, while numerous subsidiaries could be wound down or enter self-administration proceedings. The report did not identify which subsidiaries or facilities would be affected.
The filing follows Shell’s sale of Sonnen to Tiven this summer, after years of searching for a buyer. Sonnen is headquartered in Wildpoldsried, in Germany’s Allgäu region. The company’s broader group includes operations beyond Germany, but the reported insolvency plans raise questions about how those activities will be managed.
Customer Service and Operations at Risk
The immediate concern for households is whether Sonnen can continue supporting installed batteries, energy management services and related customer commitments during insolvency proceedings. The company’s reported intention to serve its 150,000-plus customer base is a stated plan, not confirmation of how long service levels or warranties will remain unchanged.
The reported prospect of keeping just one production facility operating also signals a major contraction in manufacturing, if the plan proceeds as described. That could affect employees, suppliers and the availability of Sonnen products. The filing may also have consequences for the company’s presence across multiple markets, although the available report does not specify which countries or subsidiaries will be affected.
The news contrasts with a statement from Sonnen USA describing growth in the United States. That account indicates the company’s regional businesses may be in different positions, but it does not establish that US operations are insulated from changes elsewhere in the group.
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From Shell Sale to Insolvency Filing
Shell sold Sonnen to Tiven in the summer of 2026 after years of seeking a buyer. Reporting by pv magazine following the acquisition had already raised questions about Sonnen’s future, and the German communications agency representing the company declined to comment on its business strategy after the takeover.
In late August, Franc Comino, managing director of Sonnen Ibérica, told pv magazine, “We remain in Spain and have high expectations here.” Sonnen did not respond to subsequent inquiries, according to the report. That comment concerned the Spanish business and does not confirm its status after the insolvency filing.
On the same day the insolvency news was reported, Sonnen USA said Tiven had acquired its entire global business and described growth in its US market. The subsidiary reported that US sales had doubled year on year and production had tripled, and said it had expanded its Georgia manufacturing facility partly to reduce dependence on global supply chains. It forecast sales of more than 180 MWh of residential battery storage capacity in the United States during 2026. Those figures and the forecast were statements from Sonnen USA, not independently verified results.
“Sonnen USA remains firmly focused on innovation in virtual power plants and further growth in the United States.”
— Blake Richetta, CEO of Sonnen USA
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Scope of the Filing Remains Unclear
The insolvency register had not published an official notice at the time of the report, and details about the proceeding’s legal scope were not available. It is not clear which subsidiaries will be liquidated, which may enter self-administration, or which production facility is expected to remain open.
The company has not publicly detailed how it will maintain customer service, product support, warranties or supply of parts during the proceedings. Its response to pv magazine was not available, and the reported plans have not been confirmed through a published insolvency notice.
The relationship between the German filing and Sonnen USA’s operations is also unresolved. Sonnen USA reported growth and Tiven’s acquisition of its global business, but did not comment on developments in Germany when contacted by pv magazine.
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Formal Notices and Restructuring Details
The next concrete information is likely to come through an official insolvency-register notice and statements from Sonnen or the administrators handling the proceedings. Those details should clarify which legal entities are involved, what steps are planned for subsidiaries, and whether the reported production changes will take effect.
Customers, employees and business partners will also be watching for direct guidance on service continuity, employment and product availability. Until Sonnen provides those details or formal filings are published, the company’s plan to continue serving customers and the reported restructuring measures remain subject to clarification.
Key Questions
Has Sonnen officially filed for insolvency?
Handelsblatt reported that Sonnen filed, and the company confirmed the proceedings to the newspaper. The report said an official notice had not yet appeared in the insolvency register.
Will Sonnen continue serving its customers?
According to the report, Sonnen plans to continue serving more than 150,000 existing customers. The company has not provided public detail on how service, warranties or support will operate during the proceedings.
What could happen to Sonnen’s subsidiaries and factories?
Handelsblatt reported that numerous subsidiaries may be liquidated or placed into insolvency proceedings under self-administration, and that only one production facility would remain operational. The report did not identify the entities or facility involved.
Does the filing mean Sonnen USA is also insolvent?
The available report does not say that Sonnen USA has filed for insolvency. The US subsidiary separately reported growth and described Tiven’s support, but it declined to comment on developments at Sonnen in Germany.
Source: rss
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