This paper propose a method to evaluate a electricity project self-generation with renewable energy sources under the new Colombian normative framework and it includes the uncertainty than characterized this type of projects. An economic optimization model was designed to evaluate the self-generation project management; the cash discount flow method is implemented with Monte Carlo Simulation (MCS). A Radial Basis Function Network with causal variables (historic and forecast) was used for modeling the forward price and MCS for the system generation and the output of the economic model. The case study that was developed in shopping centers considering the possibilities of electricity generation surplus export and, response demand programs. The applicability of the proposed economic model is shown, through which the scenarios in which the project is viable are determined.