VoltStorage

VoltStorage is an energy storage company developing and manufacturing stationary storage systems based on redox flow technology. It built its business around redox-flow battery concepts and positioned its products to enable renewable energy to be available around the clock. Public profiles describe VoltStorage as designing stationary flow-battery systems for a range of applications, including energy storage for energy companies as well as use in other sectors.

Independent industry coverage also links VoltStorage to iron-salt battery technology, describing an ‘Iron Salt Battery’ approach as a long-duration option intended for renewable and grid energy storage. In later coverage, VoltStorage is described as having ceased operations in mid-2025, while its assets and intellectual property were subsequently acquired by ESS Tech in 2026 to expand long-duration energy storage capabilities.