The project, invested and constructed by China Energy Engineering Group Co., (CEEC), has set three world records in terms of single-unit power, storage capacity, and energy conversion efficiency. This milestone marks China's CAES technology entering the 300 MW era of engineering. . BEIJING-- (BUSINESS WIRE)--The world's first 300 MW compressed air energy storage (CAES) demonstration project, "Nengchu-1," was fully connected to the grid in Yingcheng, central China's Hubei Province on Thursday, marking the official commencement of commercial operations for the power station. cn] China has made breakthroughs on compressed air energy storage, as the world's largest of such power station has achieved. . The Nengchu-1 plant in China sets records with 300 MW power, 1,500 MWh capacity, and 70% efficiency, advancing green energy storage solutions With a capacity of 1,500 MWh and a power output of 300 MW, the Nengchu-1 Compressed Air Energy Storage (CAES) plant in China has claimed global leadership in. . Compressed-air-energy storage (CAES) is a way to store energy for later use using compressed air.