As dirty fucking hippies predicted, because we've been through this before with telephone deregulation, electricity "competition" will lead to companies engaging in dubious practices to bilk you out of your money. Electricity isn't like gas or a bottle of milk. You use it most of the time without having any sense of the per unit cost (both per kilowatt hours and how many kilowatt hours your teevee users), you just know roughly what your bill "should" be based on past experience. This is just one more pain in the ass for people who have enough pains in the asses to deal with.
And I've stuck with the original electric company, as when the armies of aggressive door-to-door salesmen were hired to try to get people to switch it was pretty clear how this would play out.