The development of high-performance electrochemical energy-storage (EES) system with superior energy and power densities is of utmost importance for effective implementation in electric vehicles (EVs). Herein, we have prepared the tungsten oxide (WO3) nanostructures via a hydrothermal route and investigated their electrochemical energy storage properties by fabricating a symmetric supercapacitor (SSC) using an organic liquid electrolyte. Physico-chemical characterization confirmed the formation of hexagonal phase WO3 nanostructures with sheet-like morphology. The WO3 SSC possesses a high specific device capacitance of 27.56 F/g with an energy density of 34.45 Wh/kg, and better cyclic stability. Further, the WO3 SSC acquires a high-power density of 18.75 kW/kg that overwhelms the required power target for storage of regenerative braking energy in electric vehicles (EVs). As a proof of concept, we demonstrated the capability of the WO3 SSC to capture the regenerative braking energy from the braking process (using a prototype similar to EVs). Overall, the experimental results emphasize the potential application of WO3 SSC as an ideal EES system for the next generation EVs.