Hallen Battery Energy Storage System (BESS) is a lithium-ion battery storage power plant comprising 16 modules with a 2 megawatt-hour unit capacity each. The BESS modules have been stacked to optimize the available area of the site.
The project is located near the city of Bristol in the Avonmouth area and started operating in December 2021. It operates across all markets, providing ancillary services such as frequency and voltage regulation, reactive power contribution to the national and local grid network.