Controlling energy with thoughts... I think that is the main concept of Psychokinesis/Telekinesis. So the real question is "is it possible to control energy using the mind?".
Gravity is energy (or so I think). So if one can, using his mind, accumulate energy enough to oppose gravity and friction for a certain object then he can lift that object. He wouldn't be violating the laws of physics as so many skeptics say about psychokinesis. It's basically the same as physically lifting the object with your hands. So I guess the heavier the object the stronger concentration or focus or whatever is needed to build up the required energy.
I think it all makes sense.
But still and again, the question is "is it possible to control energy using the mind?".