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In this work, we derive a correct expression for the one--component plasma(OCP) energy via the angular--averaged Ewald potential (AAEP). Unlike E.~Yakuband C.~Ronchi (J. Low Temp. Phys. 139, 633 (2005)), who had tried to obtain thesame energy expression from a two--component plasma model, we used the originalEwald potential for an OCP. A constant in the AAEP was determined using thecluster expansion in the limit of weak coupling. The potential has a simpleform suitable for effective numerical simulations. To demonstrate theadvantages of the AAEP, we performed a number of Monte--Carlo simulations foran OCP with up to a million particles in a wide range of the couplingparameter. Our computations turned out at least two orders of magnitude moreeffective than those with a traditional Ewald potential. A unified approach isoffered for the determination of the thermodynamic limit in the wholeinvestigated range. Our results are in good agreement with both theoreticaldata for a weakly coupled OCP and previous numerical simulations. We hope thatthe AAEP will be useful in path integral Monte Carlo simulations of the uniformelectron gas.

One--Component Plasma of a Million Particles via angular--averaged Ewald potential: A Monte Carlo study