Abstract: The Sichuan power grid, which experienced a power crunch in 2022, was the focus of the research. By employing an 8760-hour power simulation, it analyzed the integration of Pumped Storage Hydropower (PSH) into the system to ensure the reliability and stability of the electricity supply. The quantitative combination model incorporated PSH, thermal power, wind power, and solar power in the Sichuan power grid. Using predicted data from the "Sichuan Province Power Grid Development Plan (2022–2025)", the "Expected Targets and Recommendations for the Responsibility Weighting of Non-Hydro Power Consumption of Renewable Electricity by Provinces (Regions and Municipalities) (2022–2030)", "Medium- and Long-Term Development Plan for Pumped Storage Hydropower (2021–2035)" issued by the National Energy Administration, a numerical simulation was developed to formulate two major types of scenarios for the Sichuan Power Grid in 2030 and 2035, corresponding to 16 multi-power transforming scenarios. The comprehensive evaluation index system for power supply reliability and stability was assessed for the Sichuan power grid. The results demonstrated that the equivalent capacities of PSH outperformed gas-fired power plants in terms of power supply reliability and stability. In conclusion, configuring 6 GW of PSH in the Sichuan power grid by 2030 and 12 GW by 2035 could effectively enhance the system's power supply reliability and stability.Key words: new-quality productive forces; Pumped Storage Hydropower (PSH); thermal power; renewable energy; time-series simulation