Hams Hall BESS Site Sets New Standards in Environmental Safety with Aquaspira and Wills Bros Group
The Hams Hall battery energy storage system (BESS), with a capacity of 400 MW/1.4 GWh, aims to establish advanced firewater containment standards in the UK. This project is crucial as it addresses the growing scrutiny of fire safety in large energy storage facilities.

The Hams Hall BESS, located in the West Midlands, is poised to be one of Europe's largest facilities, facilitating over 1750 MWh of battery storage. A partnership between Wills Bros Group and Energy-Io is implementing a firewater management solution using Aquaspira's pollution containment tank system.
The revised design decreased the overall footprint by 30% and reduced the number of joints to 15, enhancing watertight assurance. The project adheres to Ciria C736 guidelines, ensuring the capture of contaminated runoff.
Successful commissioning was validated by passing the BSEN 1610 Water Drop Test. This initiative illustrates the energy sector's shift toward stricter compliance with environmental regulations, highlighting the importance of effective firewater containment in future BESS developments.




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