Article 18 of Law 143 of 1994, modified by Article 67 of Law 1151 of 2007, established that:
"Article 18. Generation of Electric Energy in the National Interconnected System. The Ministry of Mines and Energy is responsible for determining the expansion plans for generation and the interconnection network as well as setting criteria for guiding the planning of transmission and distribution. Generation and interconnection plans will be taken as points of reference and will aim to optimize the balance of energy resources for satisfying the national demand of electricity, consistent with the National Development Plan and the National Energy Plan."