November 7, 2025: Lithium battery systems firm BMZ Group has filed for insolvency for two of its German subsidiaries after the loss of a key ESS customer.

The group said the filing for BMZ Germany and BMZ Holding was made on October 24 under self-administration rules.

BMZ said the move was against the background of an acute liquidity crisis and the need for restructuring, following the loss of what it described as a major customer in the energy storage segment, as well as the resulting legal disputes and costs. The customer was not named.

In Germany, self-administration proceedings allow companies to reorganize their finances and business under the supervision of a court-appointed administrator. The management retains control of the company and its assets, allowing for a structured reorganization process.

BMZ said its management team was now working to establish a viable restructuring plan, aiming to spin off the operational business of BMZ Germany into a new structure.

Despite the insolvency, existing shareholders have contributed bridge financing and additional capital to maintain business continuity.
BMZ entered the energy storage sector in January 2024 with the launch of its first ESS system — lithium-chemistry based Power Bloxx — for the commercial market.

In March 2024, BMZ said it was expanding into the sodium ion tech sector, with series production of its new ‘NaTE’ battery cell product range, which would include cylindrical and prismatic cell formats, set to start in mid-2025.