In the latest episode of the EU Energy Projects podcast series, our host, Areti Ntaradimou had the pleasure of discussing with Michael Villa, Executive Director of SmartEn, and Joachim Gruber, Staff Managing Director Technology at Netze BW GmbH. Our discussion centered around the evolving concept of flexibility in the energy system. While both guests agree on its growing importance, especially considering increasing renewable integration, they approach the topic from different professional perspectives. Michael emphasizes the urgent need to activate demand-side flexibility through market-based mechanisms, whereas Joachim focuses on the physical and economic realities of grid infrastructure and the potential limitations of over-reliance on market solutions.