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An analysis of the performance of an idealized infinitely variable source of reactive power on distribution system primary feeders is presented. Necessary conditions for optimally siting, sizing, and operating the device are developed. Performance of the device is compared to performance of a fixed capacitor bank installation. Significant benefits realized are identified and illustrated with examples. Benefits include increased energy and peak power savings, improved feeder voltage characteristics and increased feeder capacity. A suboptimal strategy is presented and evaluated to illustrate one approach to realization of the device.