Kroll's Investment Banking Team Advised the Management and Insolvency Trustee of VoltStorage on the Sale of VoltStorage's IP to ESS Tech Inc.

In February 2026, Germany-based VoltStorage GmbH (“VoltStorage“), a pioneer in long-duration energy storage solutions developing iron-salt battery technology, signed documentation for the sale of its intellectual property to ESS Tech Inc. (“ESS”). The IP will be integrated into the ESS platform, combining two highly complementary technologies to deliver the most flexible and cost efficient long duration energy storage solution on the market, establishing a new benchmark for performance, sustainability and affordability across the battery technology sector.

VoltStorage had filed for insolvency (debtor-in-possession proceedings) in April 2025 and Kroll served as the exclusive M&A advisor to VoltStorage, represented by CRO Alexander Reus (Anchor Rechtsanwälte) and the insolvency trustee, Dr. Hubert Ampferl (Dr. Beck & Partner), in connection with the transaction.

 

“This acquisition accelerates our mission to provide clean, reliable and affordable energy storage solutions worldwide. By combining decades of iron flow battery expertise across VoltStorage and ESS, we are accelerating innovation to create the most advanced iron-salt battery platform for long-duration storage.”

Drew Buckley, CEO of ESS

 

“We are pleased that VoltStorage’s IP has been acquired by ESS which can integrate VoltStorage’s exciting technology.”

Alexander Reus, Partner at Anchor Rechtsanwälte

 

“Energy storage is a crucial component of the energy system. ESS and VoltStorage have an excellent fit with both companies focused on iron-salt battery technology.””

Jan-Hendrik Roever, Managing Director at Kroll