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.
You are right, i didnt read that far. It should be possible to turn and keep it liquid just through pressure at room temperature but i guess that wouldnt be practical.