China Builds World's Most Powerful Compressed Air Energy Storage Compressor

China Shatters Records with 101 MW Compressed Air Compressor

The Chinese Academy of Sciences has announced a major breakthrough in energy storage technology: the development of the world's most powerful compressed air energy storage compressor, achieving a peak power output of 101 megawatts. This marks the first time any single CAES compressor unit has exceeded the 100 MW barrier, more than doubling the power capacity of previous systems.

How It Works

Compressed air energy storage works by using surplus electricity to pump air into underground caverns during periods of low demand. When energy is needed during peak hours, the stored air is released to drive turbines and generate electricity. The technology offers a compelling alternative to battery storage for grid-scale applications, particularly for long-duration energy storage where lithium-ion batteries become prohibitively expensive.

Technical Achievement

The new compressor, jointly developed by the Institute of Engineering Thermophysics and Zhong Chu Guo Neng Technology, reaches a maximum discharge pressure of 10.1 megapascals and operates across a remarkably wide load range of 38.7 to 118.4 percent. At maximum pressure, it achieves 88.1 percent efficiency, described as internationally leading. The system also significantly reduces unit costs compared to existing technology.

Strategic Timing

The announcement comes at a pivotal moment for China's energy transition. The country's combined wind and solar capacity surpassed coal for the first time in early 2025, and China has set an ambitious target of 180 gigawatts of new energy storage by 2027, backed by roughly 35 billion dollars in investment. Just weeks before this compressor announcement, China activated the world's largest CAES facility, the 600 MW Guoxin Suyan salt cavern project in Jiangsu province, capable of storing 2.4 gigawatt-hours of energy.

Looking Ahead

With decades of research dating back to 2005 and demonstration projects scaling from 1.5 MW to 300 MW, the Institute of Engineering Thermophysics has systematically built toward this moment. The 101 MW compressor represents a critical step toward making compressed air storage commercially viable at scale, offering a path to store renewable energy without the rare minerals required by conventional batteries.