Well the Northeast Blackout of 2003 had quite a few lessons learned, but the fact of the matter is over time the US grid has become more interconnected - just l

Well the Northeast Blackout of 2003 had quite a few lessons learned, but the fact of the matter is over time the US grid has become more interconnected - just like Europe - and through the interconnections brings more stable and cheaper power. Sure one off events happen, but the grid is more stable now than in the past when it was less isolated. Part of that is high voltage DC to DC links that allow for sharing of electrical over production, while at the same time isolating grids. Even within ISO grid regions these links are used. The main benefit from having one ISO in the US would be a reduction of rules. If you wanted to build solar or gas or wind in California, it would be subject to the same grid rules as Texas (e.g. how to handle a fault on a line - how quickly it recovers from fault, from frequency or voltage deviations, etc.). The fact that a particular power grid is isolated from others means they can't benefit from cheaper power due to overproduction of say wind power in Kansas. That electricity goes to someone else or goes to waste. Finally if anyone here cared to read, the FERC doesn't regulate the Texas grid.. it's ISO has its own rules (which I'm pretty sure are similar to the rest of the ISOs in the US which are subject to meeting the FERC regulations or going beyond them). The Texas grid is connected to other grids. "The Texas Interconnection is tied to the Eastern Interconnection with two DC ties, and has a DC tie and a VFT to non-NERC systems in Mexico. There is one AC tie switch in Dayton, Texas that has been used only one time in its history (after Hurricane Ike). On October 13, 2009, the Tres Amigas SuperStation was announced to connect the Eastern, Western and Texas Interconnections via three 5 GW superconductor links.[2] As of 2017, the project was reduced in scope and only related infrastructure was constructed for nearby wind projects connecting to the Western Interconnection." https://en.wikipedia.org/wiki/Texas_Interconnection https://en.wikipedia.org/wiki/Texas_Interconnection