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A cost/benefit analysis proved the Residential Electric Thermal Storage concept, coupled with a time-of-day rate, to be a cost effective load management technique for the American Electric Power (AEP) System. This analysis was based on data from a four-year, 71-installation test program. The analysis was conducted separately for the Generation System and the Transmission and Distribution (T&D) systems. This paper presents a methodology for analyzing T&D systems costs and benefits. Generally, T&D System impact is either not considered or is only considered in a conceptual sense. This paper describes the impact with actual system parameters.