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 completed the augmentation of two existing battery energy storage systems (BESS) in the UK to 50 MW/100 MWh each, boosting the company's overall operational capacity to more than 1 GWh.