By Rupert Hargreaves The Gresham House Energy Storage fund has seen its net asset value (NAV) per share plunge 17 per cent in the past year amid a tough time for the energy storage market. In its final results for the year ended December, UK’s largest utility-scale battery energy storage fundsaid its portfolio of battery storage assets reported earnings before interest, tax, depreciation and amortisation (EBITDA) of £25.8m for the year, down 47 per cent compared to 2022. Meanwhile, at the end of the year, its NAV per share stood at 129.07p, down 17 per cent compared to the prior year period’s …