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This paper discusses the feasibility of using multiple series capacitors for compensating long high voltage AC power transmission lines. It starts by reviewing the available results for single capacitor compensation regarding its feasibility as well as the closed form expression for the optimal size and location of the compensating capacitor. It follows a derivation of the objective function used for assessing the effectiveness of series compensation when applying more than one capacitor. A computer routine is then used to identify the most economical locations and sizes of the capacitors that yield a maximum for the saving function. It takes into account both the increase in the line transmission capability achieved by compensation as well as the cost of the series capacitors. The results of several parameter studies will then be presented in order to demonstrate the mutual interaction between the different cost components. The effect of the line technical and economical data will then be easily recognized.The computational procedure is checked through its application to reduced special cases dealing with a single compensating capacitor for which exact analytical solutions are already available. 483 Downloaded by [University of Sussex Library] at 19:33 04 February 2015 484 Y. A. SAFAR AND M. M. SAIEDThe results pertinent to the improvement in the objective saving function achieved by applying multiple capacitors for compensation, as compared to compensation by one single capacitor, are then presented and discussed. A part of the paper is devoted to the important issue of the reactive power conditions at the terminals of the optimally compensated line.This reactive power injection can be a limiting factor in applying line series compensation.