Sounds like Bigdog's redneck trumper utopia of TEXAS.
The Texas Regional Interconnect did NOT collapse. Cuba's power grid DID, due to the inability to generate sufficient power on the isolated grid. They are now facing a cold start, a very difficult procedure, and Cuba does NOT have the infrastructure for it. It may take awhile to conduct the cold start procedure.
The TRIC did have to shed load, and came within minutes of a collapse, but the grid operator acted in time by shedding load, and it did NOT collapse. Texas did NOT have to conduct a cold start. TRIC serves Texas (of course!) and parts of Oklahoma and Kansas.
The last grid in the United States requiring a cold start was the Eastern Interconnect (the infamous East Coast power failure, which collapsed when a current surge on a line feeding into Canada started a cascading failure across all of the ERIC. Since this collapse, ERIC has been upgraded to prevent such a collapse again. It will automatically shed load instead.
Currently, the SDTC (formerly California) is importing almost all their power through two power lines, which are heavily overloaded. Overloaded lines sag, and it's only a matter of time before a transient (power surge) occurs on one of them (probably due to contacting brush), cascading over to the other.
The WRIC, which feeds these lines, will NOT sacrifice itself to save the SDTC. It will DISCONNECT IT, leaving all of the SDTC in the dark. Highest load is in the summer when it's hot, due to all the air conditioners and people charging their EVs. People in the SDTC will be left with nothing to do but gaze at their own navel and realize the idiocy they've done to themselves. The WRIC serves the SDTC, Oregon, Washington, British Columbia, Idaho, Montana, parts of North and South Dakota, Wyoming, Colorado, Utah, Nevada, New Mexico, Arizona, Nebraska, parts of Kansas, parts of Oklahoma, the province of Alberta, and parts of Saskatchewan. The WRIC is the most modern of the power grids, designed to shed loads instead of allowing a cascading failure resulting in a cold start condition.
The SDTC electrical supply is living on borrowed time.