First off, Enron is one power company. One corrupt power company. To suggest that because of one company that privatization is a failure, is ridiculous. Wherever you have positions of power (no pun intended), there will be corruption. The only difference between corrupt private companies and corrupt government agencies, is that private companies are eventually caught and held accountable (as much as rich white men can be held accountable in our legal system
).
A government agency is held much less accountable by the people, as there really is very little way for them to exercise power over it. If AT&T suddenly is revealed to be a corrupt bunch of hooligans, consumers can switch their local phone service to another provider. Hopefully, eventually, there will be several options for each consumer for any utility.