The paper studies the possibilities to implement small hydro power plants in a valley from Romania using hydrographical data. These power plants are combined to form a virtual power plant. The purpose is the study of the behavior of the distribution grid in a consideration of virtual power plant concept. The loading and the voltage of the lines are the main criteria for stability of the distribution network. The obtained results are showing that under the coordination of the virtual power plant, using as components small water plants, the grid is stable: the loading of the network is reduced and the voltage is kept in the quality boarders.