With the aim of achieving European and national environmental goals by 2030, the final thesis analyses the introduction and use of different types of alternative electrified propulsion systems in Slovenian Public Passenger Transport (JPP) and Ljubljana Passenger Transport (LPP). Five scenarios are presented, which foresee the replacement of part of the current vehicle fleet in different proportions. In the first two scenarios, 20% of the use of diesel buses is replaced by hydrogen fuel cell buses and battery electric buses, in the second two the share is increased to 80% and the last scenario includes a complete replacement of the fleet with alternative drive systems. Annual emissions of CO2 and pollutants are analysed for each scenario, and an economic analysis is also carried out with the aim of determining the cost of ownership. Gaseous emissions and consumption of energy vectors of vehicles are determined on the basis of measurements on buses in real traffic flow. The results indicate that none of the scenarios achieves the European goals for 2030 regarding the reduction of greenhouse gas emissions. The goal assumes the same reduction of CO2 emissions in bus public transport as in other sub-sectors of transport, therefore non-achievement of the goal was expected. In the analysis of the CO2 emissions in JPP the 3rd scenario, which foresees 80% replacement of diesel buses with battery electric buses, achieves the lowest emissions, while in the LPP, scenario 5, which envisages 50% hydrogen fuel cell buses and 50% battery electric buses, is more appropriate. When comparing pollutant emissions, we found that the first two scenarios already reach the target values. If we include the economic aspect, the 3rd scenario is more appropriate both for JPP and LPP from the today’s standpoint.
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