In order to satisfy the growing expectation for energy efficient eco-friendly transportation a number of vehicle concepts have emerged, including the hybrid electric vehicle (HEV) and battery electric vehicle (BEV). Vehicle dynamics necessitate careful sizing of onboard energy storage systems. As the penetration of electric vehicles, in both the public and private sector increases, the requirement to facilitate and utilize them becomes paramount. A particular class of vehicle, the plug-in hybrid-electric vehicle (PHEV) also poses a greater challenge to existing terrestrial based electrical supply systems. This paper of discusses the various future vehicle concepts and investigates the potential impact of PHEV's and BEV's fleets on the local electricity networks in the UK.