Recently, Unit 2 of the Huaneng Jintan 2×350 MW Salt Cavern Compressed Air Energy Storage Power Generation Project Phase II—the world's largest salt cavern compressed air energy storage project undertaken by Shandong Electric Power Construction First Company, a subsidiary of PowerChina—has completed its full-unit commissioning. This milestone signifies a significant breakthrough for China in achieving key core technologies and system integration capabilities in the field of large-capacity salt cavern compressed air energy storage. The project has garnered extensive coverage from multiple mainstream media outlets, including "News Live Room" on China Media Group's News Channel, "Evening News" on its General Channel, and "World Finance" on its Finance Channel.

To ensure the successful overall commissioning of Unit 2, the project team adhered to the guiding principle of Party building, strengthened overall planning and organizational safeguards, and strictly complied with construction specifications. The team methodically completed a series of critical tasks—including precise installation of core equipment, stress-free piping, individual unit trial operation, system purging, interlock testing, and logical verification—thereby achieving the seamless simultaneous commissioning of all four compression units in Rows A and B in a single attempt. Additionally, the team accomplished several major milestone objectives: continuous gas injection into the underground salt cavern (Phase I) for eight hours, acceleration of the turbine generator to 3,000 rpm at constant speed, and comprehensive electrical testing of the generator system. Throughout the commissioning process, key parameters—such as vibration, temperature, and pressure—of the units consistently exceeded design values. The units completed the overall commissioning safely and efficiently, demonstrating the company's advanced construction management capabilities and technical expertise in the field of compressed air energy storage. This endeavor also yielded invaluable construction and trial-operation experience, laying a solid foundation for the subsequent grid-connection and power generation of subsequent units.

Once the project is completed and put into operation, its total installed capacity will reach 700 MW, with 100% localization of core equipment. The system is designed to store energy for 8 hours and discharge for 4 hours, with an estimated 330 charge-discharge cycles per year. A single charge can store up to 2.8 million kWh of electricity, enabling the system to store surplus renewable energy during off-peak electricity demand periods and provide stable power output during peak demand periods. It will thus possess efficient peak-shaving capabilities and rapid response characteristics, significantly enhancing the renewable energy integration capacity of the Yangtze River Delta region, ensuring the secure and stable operation of the power grid, and providing critical support for the construction of a new-type power system in China and the safeguarding of national energy security.