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Growth in electricity demand with lack of investment in new transmission facilities has led to the formation of load pockets with long congestion hours over transmission bottlenecks. When assessing resource adequacy with reference to the load pockets, one needs to include both generation resources and power delivery systems to capture their impacts on system reliability and market economics at the delivery points. This paper presents a resource adequacy analysis approach to evaluate reliability as well as economic impact in a competitive energy market. Unavailability of generating units and transmission facilities is considered in market simulations to assess the overall adequacy of load-serving ability in a load pocket. Effects of transmission are illustrated through a market simulation analysis of the NYCA system based on publicly available transmission, generation, and demand data.