Gresham House Energy Storage Fund plc (<a href="https://www.londonstockexchange.com/stock/GRID/gresham-house-energy-storage-fund-plc/company-page" target="_blank">LSE:GRID</a>) has successfully commissioned a 100-MW/100-MWh battery energy storage system (BESS) in Somerset, England, and is working on plans to extend the site with a two-phase project.