Energy storage is one of the key technologies supporting the operation of future power energy systems. The practical engineering applications of large-scale energy storage power stations are increasing, and evaluating their actual operation effects is of great significance. In order to scientifically and reasonably evaluate the operational effectiveness of grid side energy storage power stations, an evaluation method based on the combined weights TOPS. Energy storage is one of the key technologies supporting the operation of future power energy systems. The practical engineering applications of large-scale energy storage power stations are increasing, and evaluating their actual operation effects is of great significance. In order to scientifically and reasonably evaluate the operational effectiveness of grid side energy storage power stations, an evaluation method based on the combined weights TOPSIS model is proposed. Firstly, based on a brief introduction of the Jiangsu Zhenjiang energy storage power station project, a relatively complete evaluation indicator system has been established, including three aspects: charging and discharging effect, energy efficiency, and reliability; secondly, the subjective and objective weights of the indicators were calculated using Analytic Hierarchy Process and Entropy Weight Method, respectively. The combination weights were optimized using a combination weighting method based on game theory; then, the combined weights TOPSIS model is used to evaluate the actual operation effect of the power stations; finally, the actual operation data of Zhenjiang energy storage power station was analyzed, and the results verified the rationality and effectiveness of the proposed indicators and evaluation methods.••Grid side energy storage stationsOperational effectivenessIndicator systemCombination weighting methodDue to their advantages of fast response, precise power control, and bidirectional regulation, energy storage systems play an important role in power system frequency regulation (Liu et al., 2019), voltage regulation (Shao et al., 2023, Zhou and Ma, 2022), peak shaving (Li et al., 2019, Dunn et al., 2011, Meng et al., 2023a), and improving the ability to integrate new energy (Hao et al., 2022, Li et al., 2023a, Wei et al., 2021), etc. Their application scope runs through various links in the power supply side, power grid side, and power consumption side, making them one of the hotspots of theoretical research (Efstratios and Rogers, 2017, Li et al., 2018a, Meng et al., 2023b, Nesterenko et al., 2020). Furthermore, with the increasing prevalence of cyber-attacks (Li et al., 2022a), the stable operation of such systems faces more severe challenges (Shu et al., 2022, Zhang et al., 2015, Li et al., 2024), while energy storage systems offer a vital support in addressing these challenges, enhancing both resilience and reliability. At present, experts and scholars from around the world have achieved many research results in optimizing the configuration of energy storage stations (Hamidpour et al., 2022, Li et al., 2022b), scheduling control strategies (Ting et al., 2021, Ahmad et al., 2020, Rana et al., 2023, Wei et al., 2017), renewable energy grid connection (Jianhui et al., 2023, Li et al., 2021, Xinyu et al., 2023, Xingxing et al., 2023, Jicheng and Yunyuan, 2023, Li et al., 2023b), frequency and voltage regulation (Ting et al., 2023, Xu et al., 2023, Al. The capacity of the grid side energy storage power stations in Zhenjiang, Jiangsu Province, which was put into operation on July 18, 2018, is 101 MW/202 MW • h. It is a typical grid side energy storage power station in China, providing important experience and reference for the planning, construction, scheduling and operation of energy storage powe. As the largest grid side energy storage power station project in China, the operation strategy and actual operation effect of Zhenjiang energy storage power stations have practical engineering reference significance. In order to further propose a universal evaluation method for scientifically and reasonably evaluating the operational effectiveness of power stations, it is necessary to establish a relatively complete quantitative evaluation indicator system first.The evaluation indicator system carries the evaluation information of energy storage power stations, comprehensively reflecting the actual operation of energy storage power stations from multiple aspects, and is the foundation of the evaluation. When constructing an indicator system, while adhering to the principles of systematicity, consistency, and scientificity, the established indicators should have clear scientific connotations, relative completeness, representativeness, non-redundancy, and operability (Li et al., 2018c). Combining the above principles with the actual operation of energy storage power stations, the following evaluation index system has been established from the perspective of actual production and scheduling, including charging and discharging effects, energy efficiency, and reliability.The charging and discharging effects include four indicators: relative offline ca.
