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Power system major transmission requirements and their associated costs are considerably influenced by the location of the future generating capacity. The object of major transmission planning is to select the most desirable transmission network for each of the generation expansion patterns under consideration. Both economics and reliability considerations are considered in the appraisal of the most desirable transmission network. The application of a digital computer to automated transmission planning allows the system planner to investigate many alternatives with much less effort than by manual means. The ultimate selection of the generation expansion plan is then made by considering the transmission as an integral part of the total cost.