Energy storage possesses flexible power regulation and energy time-shifting capabilities, and its coordination and optimization with multiple types of regulatory resources in the system is expected to provide strong support for the low-carbon, economic, and reliable operation of new power systems. Research on the benefits of low-carbon, economic, and reliable performance of high proportion renewable energy bases for energy storage improvement is conducted. Firstly, a carbon emission measurement model for power generation in high proportion renewable energy bases is established, and evaluation indicators for low-carbon, economic, and reliable energy utilization in high proportion renewable energy bases are proposed. Secondly, a joint operation simulation model is established for energy storage and high proportion renewable energy bases, providing decision-making basis for the optimized operation of renewable energy bases with high proportion of energy storage. Finally, a fine-grained annual time scale operation simulation will be conducted for the Mengxi regional power grid to analyze the benefits of improving the low-carbon, economic, and reliable operation performance of the system under different energy storage capacity ratios. The calculation results have verified the effectiveness of the proposed operational simulation model and pointed out that as the energy storage capacity increases, the marginal benefits of improving the low-carbon, economic, and reliable performance of the system gradually decrease. Formulation optimization of energy storage configuration capacity is beneficial for maximizing its investment and operational benefits.