Power system flexibility is a solution to prevent renewable energy resources spilling, maintain a fully operational grid, and deflect unnecessary grid upgrades. Thanks to their large storage capacity, electric vehicles (EVs) and their accompanying charging infrastructure can become a large flexible resource. Except private home charging, it is likely that most, if not all, charging infrastructures will be organized in groups – here referred to as clusters. Clusters differentiate between charging behavior and their respective flexibility.

There may, however, be significant differences in the purpose that charging flexibility need to serve, depending on the charging cluster in which the EVs are connected. I.e. EVs charging in a home environment may target other services than EVs connected at a workplace or in public. Therefore, two fundamental research questions are discussed in this special session.

1. How much is the charging infrastructure demand when considering charging clusters as a whole and separately?
2. What grid services can the different clusters provide when taking into account their available flexibility?

The session will allow the participants to discuss tradeoffs and services prioritization. A special focus will be on local services, such as load balancing, and provision of system-wide services. The first may be essential in the future to adhere to local power constraints, the second to become an active part of the power system and targeted market.