Jintan (金坛) Phase II Unit 2 completed whole-unit startup; the project plans two 350-megawatt compressed-air energy-storage units.

The milestone applies to Unit 2 of the Phase II project. The salt-cavern compressed-air energy-storage project is located in Jintan District, Changzhou, Jiangsu (江苏省常州市金坛区), and POWERCHINA (中国电建) participated in its construction. The reported achievement is completion of whole-unit startup, rather than an explicit announcement that the entire project has entered commercial operation.

The planned configuration comprises two 350-megawatt units without supplementary combustion. The report specifies eight hours of energy storage and four hours of generation, with energy-conversion efficiency above 70%. It also states that a single charging cycle can store 2.8 million kilowatt-hours, a project-level energy figure distinct from each unit’s power rating.

The source makes broader claims about scale and equipment localization. It describes the station as having the world’s largest single-unit power, largest total capacity, and highest overall efficiency among salt-cavern compressed-air storage stations, without supplying comparative data. It also states that core equipment will be 100% domestically produced upon completion and commissioning; that completion-stage statement should not be treated as proof that the full project is already operational.