In the process of building a new power system dominated by new energy sources, power storage is a key supporting technology that ensures the safe and stable operation of the power grid, enables the flexible regulation of the system, and raises the level of new energy consumption. It is also key to achieving carbon peak and neutrality as well as energy transformation.

Three technical documents in the field of electrical energy storage were released recently, the development of which was led by China. They are IEC TS 62933-2-3:2025, Electric Energy Storage (EES) Systems—Part 2-3: Unit parameters and testing methods—Performance assessment test during site operation, IEC TR 62933-3-200:2025, Electrical energy storage (EES) systems—Part 3-200: Planning and performance assessment of electrical energy storage systems—Design principles of electrochemical based EES systems, and IEC 62933-4-2:2025, Electric energy storage (EES) systems—Part 4-2: Guidance on environmental issues—Assessment of the environmental impact of battery failure in an electrochemical based storage system.

The documents fully consider the demands of EES system application, and specify the parameters and testing methods to assess the performance of EES systems, methods to evaluate the negative impact on the environment caused by battery system failure, and engineering cases and design requirements of electrochemical EES systems.

They will become a vital basis of product R&D, engineering design and system operation for global manufacturers, users and third-party bodies. They will further promote the technology, standardization and product quality of China’s EES industry, which are of great significance in enhancing the industrial strength in global markets.