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Landfilling is the most commonly used option for waste disposal in China but occupies massive land resources and solar landfills could be a win-win solution by installing photovoltaic (PV) systems on the closed landfills. This paper theoretically studies the feasibility of solar landfills and compares two possible PV technologies, which are polycrystalline silicon (p-Si) and thin film PVs, from the aspects of energy and financial performance. Based on the research, the capacity factors of p-Si and thin film PV are 19.706% and 17.825%, while the conversion efficiency of them are 12.52% and 10.05%, respectively. The financial analysis indicates that the discounted payback period of p-Si PV is 13.42 years while that of thin film PV is 18.56 years. From another aspect, the levelized cost of electricities of p-Si and thin film PV are 0.87 and 0.92 CNY. The conclusion that can be drawn from the above research is that solar landfills are feasible for the case in Qingyuan energetic and financially. Compared with the thin film PV, the p-Si PV is the optimal choice for solar landfills no matter from the aspects of performance or financial consideration.

Energetic and financial analysis of solar landfill project: a case study in Qingyuan