The progressive substitution of traditional buses with electric ones in urban public transport constitutes a fundamental challenge towards sustainable mobility. This paper presents a methodological approach to assess energy consumption in urban bus networks, focusing on a city with varied topography and examining alternative bus lines for similar trips. Utilizing a quasi-static longitudinal model, real GPS data, and open access terrain models, the analysis aims to provide a nuanced understanding of energy performance, considering factors such as stop characteristics, gradients, and driving styles. The influence of driving style on commercial speed is observed to be modest, yet significant, in terms of energy efficiency. This research identifies the most advantageous line for transitioning from Internal Combustion Engine (ICE) to Electric Motor (EM) powertrains, resulting in a significant 68% reduction in energy consumption. Beyond specific line details, this methodology offers insights applicable to medium-sized cities, emphasizing efficient route prioritization and providing enhanced user information for informed decisions in the context of sustainable transportation solutions.

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