It's qualitative energy, not quantitative energy. The same energy one feels when one experiences love, feels lifted up by a favorite song, or feels exuberance when one's team wins the superbowl.
So yes, people experience love, fill inspired, or feel exuberance, and those are subtle energy in different forms. But it also has substance. Someone skilled in its use can intensify it, purify it, project it, and influence someone else's mood with it.