In the context of rapid but unstable renewable energy development, electricity storage technology is becoming a key link in modern energy systems.
On February 5, 2026, China announced a major breakthrough in compressed air energy storage (CAES) technology, when it successfully developed the world's largest CAES compressor, exceeding the 100 MW mark, according to Xinhua News Agency on February 5, 2026.
The compressor, researched by the Institute of Technical Thermodynamics of the Chinese Academy of Sciences (CAS), in collaboration with Zhong Chu Guo Neng Technology Company (Beijing), is the core part of the CAES system. This device achieves a peak power of 101MW, has a wide operating range, and is considered to be among the top in the world.
The CAES device works like a "giant air battery". When there is excess electricity, usually at night or when there is strong wind and sunshine, the system uses that electricity to compress air and store it in underground caves or high-pressure tanks.
When electricity demand increases, compressed air is released, causing the turbine to rotate to generate electricity. CAES acts as a giant battery storing and reusing electricity, helping to balance supply and demand in the power system.
The US and Europe have been pioneers in deploying CAES since the 1970s. Plants such as Huntorf (Germany) or McIntosh (USA) have proven the feasibility of this technology, but mainly use traditional CAES, when using fossil fuels to heat the air when generating electricity, causing efficiency and "green" levels to be limited.
Japan is also investing heavily in CAES research, but focusing on small and medium-sized systems, serving local grid stability. Projects here are mainly at the experimental or limited commercialization level, with power much lower than the 100MW mark.
In that context, China's successful development of CAES unit compressors over 100MW, with high efficiency and sharply reduced costs, is considered a significant step forward, bringing CAES closer to large-scale industrial applications.
The successful development of industrial-scale CAES machines helps China be proactive in its energy storage ecosystem. With a new breakthrough, China shows its ambition not only to catch up but also to surpass in the electricity storage technology race, a field considered the key to the clean energy era.
