The world’s largest demonstration plant for a new kind of renewable energy storage is up and running in the west of the China. Called liquid-air energy storage (LAES) the plant uses renewable electricity to compress air to extreme densities until it turns to liquid. It can then be rapidly released to power a turbine and discharge that green energy back into the grid.
Compressed air storage already exists. That’s different from liquid air storage.
The umbrella term is cryogenic energy storage, which handily clears up all this confusion