The return on investment (ROI) of photovoltaic power plants is usually between 5- 10 years. The specific return on investment depends on many factors, including project scale, geographical location, solar radiation level, power market conditions and policy support. Generally speaking, it is common that the return on investment of photovoltaic power plants is between 10%-20%. However, the actual results will be affected by operation and maintenance costs, power market fluctuations, long-term policy changes and other factors. When making investment decisions on photovoltaic power plants, it is suggested to conduct detailed feasibility study and risk assessment, and consult professionals to obtain accurate investment return estimation.