The EU-funded STOR-HY project aims to push to a new frontier of pumped hydro energy storage concept while minimising costs and environmental impacts and increasing societal acceptance. It focuses on extending the lifespan and retrofitting of equipment through smart monitoring and control technologies. It also targets challenging locations, such as seawater and coal mines by developing technologies for harsh operating fluids. With advanced digital tools, the project improves operational efficiency, supporting a more resilient EU energy grid.