This success case shows how E-REDES uses Catálogos AT/MT, an AI-powered decision-support solution, to modernize high- and medium-voltage network planning. By combining historical network data, asset performance records, and engineering knowledge into probabilistic catalogues, it helps engineers evaluate alternative designs, justify investments, and assess flexibility solutions with greater consistency. The solution supports regulatory compliance and data-driven planning, delivering estimated annual efficiency gains of 148 hours.