RangerWickett
Legend
One of the easiest ways to represent supers running out of juice would be to give all Heroes the Super-Charge Power superfeat at 1st level. This lets you deal hit point damage to yourself in exchange for increasing the strength of one of your powers for a minute. Since supers usually only run out of steam when the threat is major, this feat allows them to provide a last-minute boost when they desperately need more power.