texas's independent grid means it's desynchronized with both the western and eastern interconnects; any other state could import power to offset lost generation capacity...
...but doing an AC interconnect to Texas would destroy that interconnect and every generating station in Texas as the generators suddenly draw tremendous currents and torque the turbine rotors into phase with the rest of the country, destroying themselves.
ERCOT's only way to import power is with DC power lines, which aren't subject to syncronization. these are all of them. East and North are at or near capacity, Laredo and Railroad are out until later this year, and South is nothing. They'd need dozens more of these to meet demand 
*Eagle Pass, not South. They can't even buy power from Mexico because all the equipment for that is out of service
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