By ESS news
While CAES remains a relatively small share of the overall Chinese energy storage market compared to batteries and pumped storage, the sector is rapidly expanding as larger long-term projects develop.
The recently commissioned 600 MW/2.4 GWh Huai’an Salt Cavern project dramatically increases deployed CAES capacity and claims the title of the world’s largest such project. Previously, in January 2026, the record was held by a CAES installation of 300 MW/1.5 GWh using two underground salt caves in central China’s Hubei province.
However, Huai’an’s lead may be short-lived, with a CAES project of 700 MW/4,200 MWh in the Shanzhou district of Sanmenxia, which is already under development.
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