Decentralized photovoltaic production and electric vehicles are often cited as responsible for current and future needs to strengthen the electricity grid and thus partly “to blame” for the rising costs of the grid associated with the energy transition. The aim of the project was to demonstrate that the synergy between the two, through smart vehicle charging—in particular using “vehicle-to-grid” (V2G) technology (V2G) – has the potential to ease pressure on the electricity grid. To achieve this, 250 electric vehicle charging stations were to be interconnected via a smart microgrid, also including industrial consumers on the site and a large photovoltaic production facility at the Y-PARC site in Yverdon-les-Bains. The project enabled the development and validation of a communication and control architecture between the charging infrastructure (EATON AC and DC charging stations) and the MicroGrid's energy management systems (EMS) on 25 installed stations. From the first year, a robust interface was set up between the different power setpoint levels, EATON's CNM (Charging Network Manager), SEL's EMS (Energy Management System) server, and the flow visualization platforms (VGT). The AC stations were configured with cluster power limitations (e.g., 80 A for clusters 1 to 10) via the CNM. The bidirectional DC stations enabled control of the charging and discharging power (up to 22 kW / 10 kW) for CHAdeMO-compatible vehicles. The entire system could be controlled via dynamic setpoints transmitted by API. This enabled dynamic control according to different tariff and network load scenarios to be tested under real conditions, with a hierarchical management logic: local physical limitation, local network load and microgrid's load level. The system is replicable, modular, and ready to integrate network services at the national level (via Swissgrid) once the flexibility software layers are fully activated. This real-world experience provides a valuable basis for future projects seeking to combine smart charging, local energy management, and flexibility services. Despite its successes, the project encountered major obstacles, including delays in the standardization of V2G standards and restricted access to the necessary infrastructure. These difficulties slowed its progress, prevented the installation of the 250 planned charging stations, and reduced demonstration capacity, ultimately leading to its early termination.