I can tell you in New York, utilities were compelled to divest from power production. Your state may vary.
Similar to the charter school scam, the scrappy upstarts bonded out lots of debt to buy up power plants and subsequently became a powerful lobby to keep their cartel tight.
Some of the remaining municipal energy co-op utilities were exempted from deregulation, and all of them have lower cost structures.
I know Massachusetts is a similar story, not sure about others.