Energy transition poses significant challenges, as the road ahead is focused on integrating higher share of renewables, promoting a more efficient and decentralized energy system, by involving advanced digital technologies and systems such as smart devices, faster and more flexible gateways, smart meters and IoT. However, this transition necessitates the integration of cyber-defense measures and strategies into novel, resilient and self-healing /> The forthcoming smart energy ecosystem is considered as the next-generation power system, which promises self-healing, resilience, sustainability and efficiency to the critical energy infrastructure. However, due to the increasing digitization of the energy infrastructure, the risk of cyberattacks has risen dramatically, while as the smart energy and power grid is reaching every house and building, the potential of attracting cyber-attackers is magnified. Additionally, legacy systems constitute weak points of failure since they were designed in times when cybersecurity and remote monitoring and control was not part of the technical specifications for the system /> According to the European Network and Information Security Agency (ENISA): ‘A cybersecurity incident to power grids could be defined as any adverse event that can impact the confidentiality, integrity or availability of the Information and Communication Technology (ICT) systems supporting the different processes of the organizations involved in the well-functioning of the power system, including all its domains (, markets, operation of the distribution or transmission grid, customers, etc.).

SIMAVI, as leader of the EnergyShield project consortium, is co-organizing the EPESec 2021 workshop. We aim at at collecting the most relevant ongoing research efforts in the EPES digital security field. It also serves as a forum for relevant projects in order to disseminate their security-related results, boost cooperation, knowledge sharing and follow-up synergies, and foster the development of the EPES Security Community, composed of security experts and