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This paper evaluates using of Demand Response (DR) programs for congestion management as well as reducing the risk of supplying the loads. For this purpose, a coordination process between GENCOs and the ISO is considered. In the proposed approach, the coordination is modeled as a two-stage process. At first, GENCOs apply a priced-based unit commitment and submit their bids to the ISO for maximizing their profits. Then, ISO clears the market using certain demand response programs for maximizing social welfare and minimizing the risk of supplying loads. After the market clearing, if transmission flow violations were monitored, the process would provide a signal to GENCOs and DR program participants to reschedule their initial bids. Numerical studies based on IEEE 57-bus system are performed for the evaluation of the proposed method.