From S&P Global:

But the formation of RTOs and ISOs has benefitted some states and regions of the country, including Texas, said Beth Garza, a senior fellow with the R Street Institute. With an ISO, Texas was able to consolidate from 10 control areas to one with direct oversight from the Texas Public Utility Commission, she said.

“Transmission is the great enabler that allows all customers access to the lowest-cost supply,” Garza said. “And having that access to the lowest-cost supply over the largest range by a transmission system that’s dispatched and controlled by an independent entity, not one who has competing generation interests to protect, I think, is paramount and just required to provide those benefits to end-use consumers.”