Renewable energy sources are gaining more and more favor for ecological, economical reasons. Wide implementation of plants on such sources leads to an increase of uncertainty level in power grid on supplying part as most of them are straightly connected to weather conditions. While power loads are usually complex values with random trend characteristics too. Especially it concerns small-sized power grids where power load curves are even more unpredictable. One of the solutions is to implement smart grid techniques to balance the system and even to impact on customers’ behavior. But it asks for a separate control design for every power complex. The offered in the article Holarchy theory leads to simplification in control design for power grids. Holonic structure asks for the same mathematical description for lower level elements and the full complex. It provides the possibility to formulate and then use in design only one optimization problem. While the practical task will be just to insert parameters of exact power equipment. The article is devoted to the formulation of such optimization problem for small-sized power grid and description of power complex as a Holarchy with all its’ possible compounds.