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.
Still spinning a turbine, but not steam. Almost all power is spinning a turbine, from hydro, to coal, nuclear, and this apparently. It isn’t always steam though. Thermal power usually is, but others are spinning it with something else.
It is powered by phase change of a liquid, so almost steam.
Yeah all air is steamed air