Capac, Eos unveil 22 MWh German zinc-bromine BESS, sign 2 GWh deal
A planned battery project in southwestern Germany could become one of Europe’s first utility-scale deployments of zinc-bromine storage technology, as developers seek alternatives to lithium-ion systems for long-duration stationary applications.
The Bruchsal project is being developed by Capac Energy alongside municipal utility Stadtwerke Bruchsal, Triwo AG and JP Holding at the Triwo Technopark. Capac Energy told pv magazine the installation will comprise 36 battery containers providing 5 MW of power and 22 MWh of storage capacity, with commissioning targeted by the end of 2026.
The project will use battery systems supplied by US manufacturer Eos Energy Enterprises. The companies said the zinc-bromine technology avoids the use of lithium, cobalt and nickel and is designed for stationary applications requiring frequent charge and discharge cycles. They cited a non-flammable, water-based chemistry, low degradation rates and an expected operating life exceeding 25 years among the technology’s advantages.
The battery system is intended to operate as a standalone infrastructure asset generating revenues from electricity trading, flexibility services and ancillary service markets through automated optimization.
Separately, Capac Energy and Eos Energy Enterprises have signed an exclusive supply agreement covering the DACH region (Germany, Austria and Switzerland) through the end of 2031. The framework agreement encompasses battery systems totaling 2 GWh of capacity, with Capac responsible for project development, construction and operation in Germany, Austria and Switzerland.
The companies said additional projects in Germany are already under construction or development and are also expected to enter operation by the end of 2026. They said the partnership aims to broaden Europe’s utility-scale storage technology mix beyond lithium-ion systems while reducing reliance on Asian supply chains. Capac Energy, formerly known as Nala Energy, is positioning itself as a system integrator for stationary large-scale storage projects.
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