The fourth meeting of León’s Local Living Lab (LLLL) on November 21, 2023, involved 35 participants from 20 entities across administration, academia, business/companies, and citizenship. The primary goal was to gain a comprehensive understanding of ongoing developments in León. Post-pandemic, Next Generation funds have spurred numerous projects, leading to a need for additional time in the third LLL to discuss these initiatives, particularly in energy transition. The fourth Living Lab aimed to conclude pending discussions from the previous session with a continued emphasis on understanding the diverse projects and actions in progress. Two round tables focusing on mobility and energy-city further facilitated interactive discussions, questioning, synergies, and debates, ensuring a dynamic and collaborative environment within the Lab.