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Renewable energy sources play an increasing role in the agricultural energy development. These sources are used both for autonomous power supply to consumers and for integration into a centralized power grid. The paper outlines the basics of a theoretical approach to choosing a source by the magnitude of the Umov vector, which characterizes convective energy transfer and is determined by the vector product of the flux density by the energy distribution velocity in an elastic medium. For practical evaluation of the effectiveness of different types of renewable energy sources, it is proposed to use the value of the reduced efficiency, which is a quotient of the classical efficiency coefficient division by the value of the working space of the corresponding converter. The concept of workspace includes the sum of the volume occupied by the converter and the volume surrounding it, in which the placement of other similar converters is not permissible. The necessity of considering the natural relaxation of renewable sources is considered and the necessity of comparing the dynamics of replenishment and selection of energy resources is substantiated. [ABSTRACT FROM AUTHOR]