With ever increasing concerns on energy efficiency, energy diversification and environmental protection, electric vehicles (EVs) have launched a revenge for road transportation. Among those multidisciplinary EV technologies, energy sources are the key technology for possible commercialization and popularization of EVs. This paper not only reviews the current status of EV energy sources, but also assesses their suitability and potentiality. Moreover, the concept of multiple energy sources for EVs is identified, hence the corresponding near term and long term measures are discussed.