Nowadays there is a trend that more people prefer to live in cities than in rural areas, so there is the necessity of different urbanization strategies with various transportation schemes. While in most cities in the US the population density is very low with an interval of 20 to 50 inhabitants per hectare, in cities like Hong Kong more than 250 inhabitants live on an area of one hectare. As a consequence transportation needs are different, for example gasoline driven cars as preferred transportation systems for US citizens, giving rise to an average consumption of 2000 liters per year for every inhabitant; in comparison to Hong Kong, where average consumption is only 300 Liters per year. So there is a great challenge to reduce these emissions. Apparently solutions are not planned in relation to studies by the International Energy Agency that places the United States as biggest crude oil producer in the year 2017, due the increments of tight oil exploitation. In the shown scenery electro mobility can be a solution for sustainable transportation, when it is combined with PV systems.
This study starts with the feasibility of such a combination, and shows the coverage of population where this system can be implemented. From the analysis of economy results: It can be observed that the return of investment of a PV-system can be reduced when it is combined with electric mobility. Today cars driven by an electronic motor with cost of 0.035±0.015 USD/km afforded for transportation energy are more efficient than gasoline motors (based on fuel costs of 0.5±0.1 USD/km for economic cars with a coverage of 14 km/L). So it’s demonstrated that the return of investment is minor than 5 years for the PV system. It’s worth mentioning that charging batteries of electric cars could help to smooth energy peaks in the grid caused by renewables like sun and wind energy (a challenge for further grid systems). Besides the economic study the ecological impact has to be evaluated.