A new feeding concept for electrical transportation system is presented, based on supercapacitative energy storage. Supercapacitors are new and poewrful components for energy storage. Compared with batteries, the amount of energy supercapacitors can store is low and does not allow large vehicle autonomy. Because supercapacitors have the property to be re-loadable in a few seconds, a sequential supply system has been developed, considering repetitive feeding at the shops. To solve the problem of the high power amount needed to reach short, refilltimes, a solution is proposed, which consists of using an intermediary supercapacitive tank placed at fixed stations, which is refilled between the bus arrivals with a much lower power. In addition to the descritpion of the needed power electronic concerts, theoretical and experimentl results are presented, defining the controlled profile of the instantaneous power level, in order to achieve a fast energy transfer between two supercapacitive tanks.