A sustainable public transportation system is crucial to reduce air pollution and the environmental impacts of the sector. This is pursued not only in big cities and metropolitan areas, but also small citizen context are interested in this environmental commitment. This paper wants to analyse the renewal process of Local Public Transport (LPT) applied to a small city. A focus on the city centre of Cremona is set and the goal of reproducibility of each step is assessed as results. The implementation of two new bus lines planned to adapt the service currently available to the potentially evolving demand is discussed as result. Electric-powered buses were selected as the best alternative to accomplish the purpose of this research and a particular attention was paid to the energy supply chain. The economic aspects were then explored to evaluate the different scenarios given by the adoption of supply chain chosen.