Hydrostor wins grid approval for 200 MW long-duration storage in Australia

The approval from AEMO and Transgrid confirms the project has passed a critical connection requirement for the New South Wales transmission network. Silver City will store surplus electricity as compressed air in an underground cavern and dispatch power through a turbine when needed. Hydrostor says 50 MW / 250 MWh will be reserved for backup power to Broken Hill and far-west NSW during network outages. Long-duration storage of this type is becoming more important as Australian grids add more solar and wind while managing evening peaks and outage resilience.