Bidirectional charging is transforming electric vehicles into active participants in the energy system, enabling energy flows between vehicles, charging infrastructure, and the grid. This talk will examine the entire impact chain of bidirectional charging, from the vehicle to the grid, and focus on how protocols such as EEBUS, OCPP, and ISO 15118-20 facilitate communication and energy management within this process. We will explore the key challenges and gaps in this ecosystem and discuss strategies for addressing them. EVerest, an open-source EV charging stack, will be highlighted as a solution for integrating these protocols to enable efficient and interoperable charging solutions. Join us to discover how open standards and innovative strategies are driving the future of bidirectional charging and energy management.