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This paper aims to apply a network-flow method for the load-flow calculation in electric power systems and to discuss a computer handling technique from the computational aspects. An attractive feature of the new method is its ability to handle calculation rapidly without requiring so large an amount of computer memory. The program based upon the proposed method has been developed, and a flow diagram for the algorithm is presented. A numerical example for the calculation is also described as well as the convergence characteristics of the solution of computational processes. The method is compared with a conventional one from viewpoints of computation time and data storage space.