Maria Hieronimus leads the "System of the Future" department at Elia Group, where her team takes a systemic view of the core business of a Transmission System Operator, identifying the internal and external changes needed to make the energy transition more affordable while maintaining system stability. With a background in physics and a strong foundation in energy consultancy, Maria has long been dedicated to strategic research and innovation. At ENLIT, she shares insights from the TSO perspective on the role of storage, particularly batteries, in enabling a green, secure, and cost-effective power system.