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The Use of Biomethane in Internal Combustion Engines for Public Transport Decarbonization: A Case Study

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  • Michel Noussan

    (Department of Energy, Politecnico di Torino, 10129 Torino, Italy
    Paris School of International Affairs, Sciences Po, 75007 Paris, France)

Abstract

Public transport can play a central role in representing a viable and sustainable mobility solution, especially in urban areas. Average energy consumption and emissions per passenger are much lower than for private cars. At the same time, current buses often mostly rely on diesel, and there are different solutions that can contribute to public transport decarbonization. Biomethane is among the options to exploit local low-carbon resources to decrease the emissions of public transport in urban environments. This paper presents the analysis of a real case study considering real data on the fuel consumption and mileage of the existing bus fleet in the city of Turin, Italy, composed by diesel and natural gas buses. The aim of this study is to estimate the effect of different penetration levels of biomethane in substitution of the current fuels. The results show that the use of biomethane in urban buses could save to up to 71% of emissions compared to the current situation, and savings would increase to 75% when deploying biomethane and electric buses together. Average emissions per pkm could decrease from a current level of 85.5 g CO2 /pkm to 21.3–63.4 g CO2 /pkm depending on the penetration of biomethane and electric buses. The sensitivity analysis shows even higher savings when accounting for the future decrease of the electricity carbon intensity in Italy and for the additional benefits related to avoided emissions from manure disposal. The results of the analysis demonstrate the potential contribution of biomethane in decarbonizing urban buses, and the findings presented for this case study can be of use for policy makers and researchers that deal with a similar situation in other cities and countries.

Suggested Citation

  • Michel Noussan, 2023. "The Use of Biomethane in Internal Combustion Engines for Public Transport Decarbonization: A Case Study," Energies, MDPI, vol. 16(24), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:7995-:d:1297394
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