I need my alone time to, but I agree with people who say "energize" is not the best word. I think I would say renewed or refreshed.
Dealing with other people elevates my adrenaline level. Even if it is enjoyable interaction, I can only handle so much of this elevated andrenaline. It wears me out.
Being alone renews my calm and inner peace. The adrenaline can disapate. I feel more grounded, centered.
I think I feel energized in sense being alone, but it is a type of calm energy. I have creative energy and mental energy.
It is hard to put into words but there seem to be different types of energy: social energy (going out, interacting with others), physical energy (dancing, sports, exercise), creative energy (making things), mental energy (reading, writing, research). When people talk about energy or being energized that often refers to the first two, but most of my energy is for the second two.
Ilah