In recent years, vehicular networks have been drawing special attention because of its significant potential role in the future smart city. Safety is a crucial status in vehicular networks, especially in energy trading where security of transactional data and safety against critical attacks is of most concern. The Sybil attack is one where an adversary can create multiple fake identities, become a part of the P2P network and try to manipulate the decision of the entire network in accordance to his own will. Thus in view to enhance the security of system, this paper focuses on a Sybil attack mitigation method based on blockchain and it's Proof of Work (PoW) consensus. Also a framework of automated privacy-preserving selection of charging stations (CS) based on pricing and the distance to the electric vehicle (EV) is presented. A blockchain based approach increases the transparency between EV and CS while preserving the privacy of the EV owners.