A new perspective on the performance comparison of pure electric buses versus converted electric buses in public transportation systems

The utilization of electric buses presents a viable solution to the reduction of greenhouse gas emissions and the concomitant decrease in fossil fuel consumption. Furthermore, their low-noise operation has the additional benefit of reducing noise pollution, which is a particular issue in large urban areas. This constitutes a significant advantage for public transport systems. Additionally, they provide cost savings in operations and maintenance, which represent a substantial proportion of expenditure for public transport operators. However, the initial purchase cost of electric buses is higher than that of conventional buses (diesel and CNG). This discrepancy can be attributed primarily to the absence of economies of scale in the manufacturing of electric bus subsystems and the substantial expenses associated with non-standardized, disparate technologies, most notably the high-voltage traction battery. The considerable disparity in the upfront cost of electric buses (in comparison to their internal combustion counterparts of equivalent specifications) has prompted a novel strategy among local authorities responsible for the provision of public transportation services: Retrofit! This paper presents, for the first time, a comparison between all-electric buses constructed from the ground up and retrofitted diesel-electric buses in actual public transportation operations. The results obtained will facilitate an evaluation of the retrofit approach within the context of sustainable transport policies, with the ultimate objective of raising awareness among relevant audiences and decision-making mechanisms.