A novel index developed by Colombia's Power System Operator defined for evaluating the quality of the electrical model of the Colombian Power System, is presented. The index integrally evaluates the quality of the models through comparisons in magnitude and shape of electrical variables obtained with the dynamical models with respect to the electrical variables measured on the elements connected in the power system. The related variables are taken from the most relevant buses of the power system using PMUs. This development constitutes a great help for the Colombian Power System regarding the integration of new technologies in the next future such as Battery Energy Systems, Renewable Resources and Distributed Energy Resources.