Purpose. To analyze the development of the notion "Economic equivalent of reactive power" (EERP) and deals with definitions of this concept in historical perspective. Methodology. The method of researches is based on the theory of the electrical engineering at the use of methods of regulations reactive power. Findings. It is emphasized that the impact of the voltage change in the network on the alteration of resistance losses from the var flow should be taken into account while doing the corresponding mathematical derivation and introducing numerical illustration. Hence, absence of necessity to consider capacitive generation of overhead lines has been proved computationally. Peculiarities of the regulating effect of voltage related to the reactive power and EERP have been substantiated, which allows to treat them jointly within the framework of electromagnetic compatibility concept. It is stressed that in computing EERP it is reasonable to use assessed values of parameters, which is illustrated by several examples. Originality. Feasibility of using the method of incremental rates with partial derivatives has been theoretically substantiated. Incompleteness and incorrectness of the input information impact on the value of EERP have been assessed. It was proved that regulatory documents or instructions are vital to standardize recommended methods of calculations. Practical value. Approaches to project practices are also in the centre of attention. Analysis of the obtained results allowed to give a quantitative assessment to the impact of voltage on EERP, as well as to the values of minimal losses of reactive power. An approximate formula for assessing resistance of the external grid in computing EERP has been derived.

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