The transition toward a sustainable energy system must prioritize decarbonizing road transport and integrating electric vehicles (EVs) into the electricity grid. This Reprint will address the key roles of EVs in driving the energy transition through road transport decarbonization and grid integration, adopting a systemic approach. The studies included in this Reprint explore operational demands and infrastructure needs related to mass EV deployment, optimizing charging infrastructure, accommodating variable renewable energy sources, and mitigating grid challenges. The contributions examine advancements in V2G (vehicle-to-grid) technology, as well as the impacts of battery aging and innovative charging protocols like OCPI and ISO 15118, which support smart charging methodologies. Moreover, the research presents solutions for managing high renewable energy integration, considering island and microgrid environments, alongside enhanced planning and smart management schemes for EVs. By addressing these aspects, this Reprint provides insights into the technologies and strategies shaping a sustainable, integrated EV ecosystem that respects electricity grid needs and user preferences.