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County updates board on Poemountain FLASHES microgrid and pumped-storage feasibility after PG&E grant reconsideration
Summary
County staff and Trane updated the Board of Supervisors on Poemountain FLASHES, a proposed pumped-storage hydro plus solar and water-storage project intended to support firefighting and provide microgrid capability; a revised PG&E Microgrid Incentive Program track allows the county to advance feasibility studies.
County staff and Trane representatives gave an update on the Poemountain FLASHES project at the July 22 meeting, describing it as a "super closed-loop" pumped-storage hydro design coupled with 30 megawatts of solar PV and on-site water storage for firefighting support.
FLASHES (Firefighting Linked Auxiliary Supply Hydraulic Energy Storage) would place high-elevation storage tanks and roof tanks on county land near the Northwest Wastewater Treatment Plant to create roughly 90 million gallons of stored water above Highway 29 and operate up to three Pelton turbines to provide energy to the Lucerne and Hartley substations.…
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