The promising future of developing large-scale PV solar farms in China: A three-stage framework for site selection

Large-scale Photovoltaics (PV) play a pivotal role in climate change mitigation due to their cost-effective scaling potential of energy transition. Consequently, selecting locations for large-scale PV power plants has gained worldwide prominence in recent decades. Although massive studies have examined various siting criteria, land consolidation and cost-benefit feasibility issues are not often included due to the lack of a comprehensive and discretionary decision-making system. In this study, we introduced a three-stage framework combining DBSCAN clustering and cost-benefit analysis to identify the most efficient and cost-effective land parcels. The results indicate that while a total area of 425,191 km² is considered developable for PV installation in China, only 23% of that area (128,588 km²) are consolidated land parcels which are suitable for developing large-scale PV power plants. Moreover, the potential of this consolidated land (8,289,662 gWh/year) can supply about 90% of China's electricity demand. However, when considering unit costs for electric and road grid interconnection, high-potential areas doubled the moderate-potential areas. These results emphasize the importance of large-scale PV plant siting as it impacts the efficiency of PV integration and the optimal land use. Hence, this methodology equips decision-makers with a practical and efficient tool for economically developing large-scale solar PV.