Clarifying the capital demand of renewable energy power generation under different climate goals in the future is the basis for the following reasonable arrangement of capital planning and adjustment of China's power structure to achieve 2060 carbon neutrality. Given this, the development path of renewable energy power generation under different climate targets is determined from literature published by the existing mainstream institutions, and the corresponding installed capacity in the future is obtained. The unit investment cost is predicted by using the learning curve to calculate the future capital demand and analyze the capital gap. The results show that under different scenarios, the demand for renewable energy funds is different, the uncertainty is significant, and there is a particular funding gap.