My job is to take something of yours and give you exactly how much you paid for it. What is my job?

Question

Invisible energy is what I'm about
It's my exclusive diet and what I give out

My job is to switch kinetic to potential
I'm usually more rural than residential

I never have objections performing for you
As long as I am fed, my job I continue

I am stable, yet my motion circuitous
My energy is practically gratuitous

I'm getting more popular these days, it would seem
Across the land, I'm becoming more widely seen

When it comes to filling the skies with pollution
I'm not the problem; I'm part of the solution

What am I?

Answer 1

I work at the Return Merchandise counter at a store.