I expect Tesla will generate all or most of its own electricity but your point is very well taken for industry in general. Texas generates more wind energy than any other state (and thus earns more money for that wind) but the governor hates wind and blamed it for the grid failures, which were clearly caused by other mechanisms. Texas government is extremely f'ed up right now.
> I expect Tesla will generate all or most of its own electricity
That's a moot point in a disaster scenario where the grid is down and traffic systems and utilities are disabled, etc. Tesla can't generate its own water, and that was one utility that was knocked out for much of Texas during the storm. There's a lot more that goes into keeping a manufacturing operation like that functional than just energy self-sufficiency.
Of course they could -- in theory they could drill a well and put in their own septic system. That's probably illegal in Austin proper but the Tesla facility is sufficiently far away that it might be legal there.
