Kinetic Dart (Tier 0) - Many consider this to be the best and fastest energy builder in the game. A good energy builder always gets a set off to a great start, as it means you are not forced to pick up an energy builder elsewhere along with a possible wasted early power as you try and move up the tiers before going into your primary framework.
It is especially nice that while telekinesis is largely a melee based set (for damage at least), it has a ranged energy builder. Ranged energy builders tend to have less situations where you are desperate for energy but have trouble getting it because you are out of melee range.