SolStor Energy LLC (SolStor) is a Long Duration Energy Storage (LDES) technology company and developer whose Concentrating Solar Power (CSP) and Electrical Thermal Energy Storage (eTES) projects will be built, owned, and operated by separate equity partners. The substantial amounts of photovoltaic (PV) electricity being constructed to meet daytime power demands have created a large and rapidly growing need for electricity generation when PV output stops at sundown. CSP plants are designed with thermal energy storage (TES) to store energy during the day to meet the energy needs from the evening, through the night, until PV generation picks up in the morning.