> CAISO has the lowest wholesale electricity costs in the nation, by far
Much lower than that provided by the TVA? Ages ago, I used to live in an area served by the TVA, and its power prices were notably cheaper than anywhere else. I'd heard that this was because a huge chunk of its power was provided by fission plants, but never investigated.
Yes, CAISO wholesale rates are much lower, but California also has the highest retail cost in the continental US, at over 28c/kWh. If any customer in the TVA paid that much for power there'd be riots.