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Transmission planning in the modern paradigm of deregulation is a delicate balancing activity. More reliable network structures may be needed to establish successful competitive electricity markets. This paper proposes a framework for evaluating transmission network expansion plans considering economic and supply reliability indices based on expected congestion cost (ECC) and expected outage cost (EOC), which are caused by power transmission congestion under the competitive environment. We Examined the impact of transmission expansion plan on electric supply reliability and congestion cost using a test system model.