Well, energy sphere basically lets you do damage as a move action for a number of round for a cost of 1 point up front, with the disadvantage that it's reflex negates and you are limited to what targets you can pick. For a single target affect, you could have a 1 point cost up front that let's you 'sustain' the attack against that target as a move action, possibly requiring another hit roll and repeating the damage from the original blast? Visually, it would be like the Emperor's lightning attack from Return of the Jedi.