Really? Wow, this is news to me as well. I first read about the class from the SRD which states 5% per level, which made me think the class was pretty useless as you approach epic. however this makes it a lot more palatable. Still though, that means that at 20th level you will have a 25% chance of being enervated, and thats particularly risky at that high a level. I love the idea of a psionic class that has more of a sorcerer feel compared to the wizard feel of the psion, but I think they fell short with the wilder.