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I wouldn't agree with your statement that "Texas' unconnected (mostly) grid is hardly to blame". Julie Cohn (historian of energy, technology and environment from Rice University) DIRECTLY blames the grid here:
NO. All grids are very fragile and even Connecticut is starting to create a statewide grid that can be quickly disconnected from the large Eastern grid they are part of. Tx needs to stay independent and many other States might want to investigate how to isolate themselves. This is one case 'where bigger grid is NOT better'.
US has three electricity power interconnected networks: Eastern, Western, and Texas. In terms of electricity reliability, Texas is all by themselves. No any other states can step in when Texas is in trouble, like the current crisis. Texas might like ultimate control of their electricity production, distribution, and pricing. But for a $10 to $15 billion fab operator, it's a risky gamble without a convincing reason.
I lived in Ca for about 6 yrs and they had rolling brownouts that were forced on various manufacturers to prevent electric grid issues. This is a common technique used by any grid operator regardless where you live or why it was caused. Thinking that Tx is unique is not looking in the mirror. You might want to read Bakke's The Grid that takes a historical look at the various grids, their blackouts, how/why they happened, various legislation since the 1970s that have caused grids to become more fragile and how green energy can cause additional issues with how the grids were designed. 'Electricity' is not like stepping on the gas or the brakes when you need more or less of something...much more trickier.