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In recent years, energy storage systems have increasingly been expected as a means of load leveling of the annual load factor. Of course it has an effect to install the energy storage systems at the substation. But some customers operate their storage system integrately and it also has an effect to increase load factor. In this paper the authors proposed a method that the energy storage systems at customer side are used for a congestion relief on transmission networks. However, it is not clear that which kind of customers has the effect of relieving transmission line congestion. First of all, this paper assumes the authors determine the optimal configuration of energy equipment including energy storage system. We propose the new cotract that electric utility subsidizes a part of the entrance cost of the energy storage systems and customers change the output pattern of energy storage according to the request of the electric utility. This paper evaluates the possibility that the contract gives merit to both the electric utility and the customer.

A Study on Power Flow Congestion Relief by using Customer-side Energy Storage System