The ‘in-situ vitrification’ (ISV) technology is one of the most promising alternative methods for the immobilization of hazardous wastes contained into polluted soils. It has been the object of a research project supported by the Italian Ministry of Industry and involving some Departments of the University of Bologna and two large regional corporations. The actual design of the supply system of this high-temperature thermal process is fundamental for the optimal control and management of this particular pollutant treatment. The paper reports in particular on the activity concerning the development of the electrical power system that have been developed for accomplishing ISV, with reference to its characteristics, realization and its application for the treatment of some polluted soils situated in the Ravenna area in Italy.