What am I?

[JHXC]

"E"

I am the universal consumable,
Always in motion,
Always in short supply,
Unpredictable, Unstoppable, Unavoidable,
An omnipotent force, strong enough
to grow forests and break the ground,
the currency of life, the carrier of light,
a magnificent river in which all of existence
maneuvers and functions on.

This one is cool JHXC. I can only guess maybe like energy, or space, or spacetime, or possibly gravity or gravitational waves.
However, none of these answers explain "always in short supply," nor do they completely explain the "grow forests" part.
Am I close? Or are you describing something in a completely different ballpark?

[Sorry, I made this riddle really fast, I have never made a riddle before.]
I live at the top of a powerful dome.
My purpose is to help hold the city together,
yet I never leave my home;
I assists with keeping peace and prosperity,
and yet I remain lifeless and cold as stone.

You are sooo close to it.

I'd say your riddle would be a flag on some sort of city government building thing.