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In this paper, an integrated methodology is proposed for planning distribution networks in which the operation of distributed generators (DGs) and cross-connections (CCs) is optimally planned. Distribution lines and high-voltage/medium-voltage (HV/MV) transformers are also optimally upgraded in order to improve system reliability and to minimize line losses under load growth. An objective function is constituted, composed of the investment cost, loss cost, and reliability cost. The energy savings that result from installing DGs is also included in this function. The bus voltage and line current are maintained within their standard bounds as constraints. DG output power is used as another constraint, where this should not be less than 30% of the generator's rated power; otherwise, the unit is not switched on. The modified discrete particle swarm optimization (PSO) method is employed in this paper for optimizing this …