Quidnet

Quidnet’s Geomechanical Pumped Storage (GES) system pumps water into deep impermeable rock formations during periods of excess renewable energy and releases it later to generate electricity—offering multi-month duration storage with minimal water use. 

Successfully tested at the megawatt-hour scale with up to six months duration and funded by DOE and private investors, Quidnet promises commercial viability in long-duration energy resilience.