Australia is repurposing abandoned underground mines into large-scale pumped hydro energy storage systems, effectively turning old mining infrastructure into giant gravity-based batteries. Water is pumped uphill into underground reservoirs when renewable energy is abundant, then released downward through turbines to generate electricity when demand rises. Using existing mine shafts dramatically reduces construction costs and environmental disruption compared to building new dams. These systems c

4 comments | Plans to build two pumped hydro energy systems in the Upper Hunter are a step closer to reality. An agreement has now been signed between Water New South Wales and Upper Hunter Hydro - a company created by former P-M, Malcolm Turnbull. #NBNNews | NBN Television | Facebook