I've never liked terms such as "not enough power", "running out of power", and "power required exceeds power available", because these terms seem to put the blame on the aircraft, when its clearly the pilot who's at fault.
If you "don't have enough power" its because you're too heavy for what you're trying to do.
If you're "running out of power" its because you either waited too long to start slowing down, or you've entered the Vortex Ring State.