China’s Huaneng Group has commenced construction on the second phase of the Jintan Salt Cavern Compressed Air Energy Storage (CAES) project in Changzhou, Jiangsu province, setting a new benchmark in the global energy storage industry. Once completed, it will become the world’s largest CAES facility, boasting record-breaking advancements in power output and efficiency.
The second phase will include two 350 MW non-fuel supplementary CAES units with a combined storage volume of 1.2 million cubic meters. This design achieves the largest single-unit power generation capacity and total storage capacity globally, with integrated efficiency surpassing all other CAES facilities. The plant will store up to 2.8 GWh of electricity per charge and support an estimated 330 charge-discharge cycles annually.
The project builds on the success of its first phase, which saw the deployment of a 60 MW CAES unit. The earlier phase provided essential operational insights, paving the way for the advanced and significantly larger second phase.
Huaneng’s Jintan project marks a significant leap forward in renewable energy storage, highlighting China’s leadership in the transition to sustainable and efficient energy solutions.
