But the fact that it is incompressible makes it more difficult to use it as a store of energy to be used on demand. One of the advantages of compressed air is

But the fact that it is incompressible makes it more difficult to use it as a store of energy to be used on demand. One of the advantages of compressed air is you can let a little out of the tank to power one thing for a bit, then a little more to power a different thing, and only need to run the generator when the tank is out of air.