Abstract: This study describes the methodology adopted to deal with the reactive power dispatch and the network data storage problem in the Western Algerian system. A combined numerical techniques, has been chosen in view to study the problem of the load flow and the optimization of the reactive power in order to reduce the active losses in big and complex networks. A control strategy is proposed with new techniques for improving the performance of sparse-matrix vector by experimental analyses and optimization of the reactive power with the use of Reduced Gradient method, those techniques are applied in Algerian network. Finally, results are analyzed to show the validity of the proposed procedure.