Since the grid is evolving continuously towards the Smart Grid, in this work the objective is to reduce the effects of power outages in the cellular networks by introducing photovoltaic panels in the base transceiver station (BTS) as backup power supply when outage takes place. Besides limiting the usage of conventional grid energy, renewable energy utilization minimizes carbon emissions and improves the performance of the systems in the context of energy consumption and cost. Powering cellular base stations with renewable energy are one of the long-term strategies for achieving green networks and reducing their operational costs.