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Hydrostor · Rosamond, Kern County, CA · CaliforniaDEVELOPER HEALTHHEALTHY
Advanced compressed-air storage in a purpose-built underground cavern; 8-hour discharge. CEC license Dec 2025; groundbreaking planned mid-2026.
Power
500 MW
Long-duration storage · First commercial
Storage
4 GWh
8-hour duration
Online
2030
approximate target
Capital committed
$300M
closed or awarded
Capital pending
$1.8B
conditional or under review
How it works
Spare power squeezes air into an underground cavern; a column of water keeps it at steady pressure. Releasing the air through a turbine makes power again.
OPEN IN 3D →DOE loan $1.8BEquity $300M
Sources: energy-storage.news · utilitydive.com · energy-storage.news
Central Coast Community Energy
200 MW resource-adequacy contract
Central Coast Community EnergyUTILITY BUYER
DOE Loan Programs OfficePUBLIC FUNDERGoldman Sachs Asset ManagementINVESTORCPP InvestmentsINVESTOR
STEP 2/4 · AT RISK Willow Rock's $1.76B conditional loan in limboThe project is permitted but its federal loan guarantee is still under review.
Policy that applies
Developer
Lenders and investors
DOE Loan Programs OfficeGoldman Sachs Asset ManagementCPP Investments
Place