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In this paper we demonstrate rigorously that electric power supply chain network equi-librium problems can be reformulated and solved as transportation network equilibrium problems. This connection was originally hypothesized in the classic book of Beckmann, McGuire, and Winsten (1956) in a chapter dedicated to “some unsolved problems. ” We con-sider two distinct electric power supply chain network models with known demand functions and with known demand market price functions, respectively, and prove that the variational 1 inequality formulations of the governing equilibrium conditions coincide with the correspond-ing variational inequalities of transportation network equilibrium problems over appropri-ately constructed supernetworks. This equivalence provides new interpretations of electric power supply chain network equilibria in terms of paths and path flows and also allows for the transfer of methodological tools developed for transportation network equilibrium prob-lems to the electric power network application domain. Numerical examples illustrate the potential of the theoretical results obtained in this paper