The present document compares methodologies of electric energy planning oriented towards the supply side, applied in several developing countries, with the proposal of a systemic plan, considering the latter as a very convenient approach for systems immersed in a multifactor and dynamic context under uncertain conditions. The main contribution of this paper is the use of strategic planning methodologies with a systemic focus to define the participation of public policies, knowledge management, infrastructure, and environmental services. It allows for the development of dynamics involving plans to ensure availability, reliability, and the quality of a power supply.