A proper analysis of whether or not the utility Entergy lacks market power has to include a rigorous model of the interconnected transmission systems in and around the Midwest, their corresponding locational and temporal markets, and the technical and commercial factors influencing price discovery. The UPLAN model of the North American power system has been deployed in a simulation of the Midwest Interconnect in order to produce a legal determination on Entergy's potential exercise of market power.
Deb, R. K., Macatangay, R. E. A., & Deb, S. (2002). An analysis of generation market power in the midwest interconnect. Electricity Journal, 15(3), 29-40. https://doi.org/10.1016/S1040-6190(02)00273-7