40+45+60=145 Energy consumed. Even if you start out with a full energy bar increased to 110 by PvP gear you will be next to completely drained for the duration that kidney shot has. A very bad move.
Even better still, to be able to do that kidney shot you need 170 energy. Starting out with 110 even if you get 10% haste the amount of energy you gain in a glyphed kidney shot only equals to 55. Meaning your target will be having control of his character before you can cast the KS.