Are you
>!Electricity?

For trillions of years, quietly I sat.

Well, I wasn't quiet at all, but it sure seemed like that.

For I work in the background, doing my part,

If I were not there, it would all fall apart

I am appreciated by all, and understoood by some.

With my prefix lies the power of the people; with my suffix their home

Take care not to touch me, for I might make you fly

Now tell me, if you can: What am I?