Running an entire leading edge semiconductor plant on battery backup is a crazy proposition in my view. Especially, for intentions of surviving another Texas winter situation without any disruption to operations. Approximately 24 hours of full-coverage battery backup would have been required to bridge the rolling blackouts.
Last I checked (about a decade ago), the SAS A2/S2 lines accounted for ~13% of the electrical load for the entire city of Austin. Just look at the amount of power one EUV light source requires today. These lines will have potentially dozens moving forward. Then consider that all of the photo area accounts for a tiny fraction of total power consumption in one of these plants.
If it were even remotely feasible for the Samsung semiconductor lines to operate on standby generator power, they would have installed these units already and no losses would have been incurred.
They might as well be smelting aluminum behind those walls. Any backup generator power or UPS devices are designed for life safety and stopping the line without causing 10+ figure losses. You cannot run one of these facilities on in-house power. Another commenter proposed a nuclear reactor installation. This is actually not a terrible idea once you understand the scale. Putting 10-15 semiconductor lines around a nuke plant makes perfect sense to me.
[0] https://pitchbook.com/news/articles/the-bay-area-beyond-rank...
[1] https://www.cnbc.com/2021/01/14/silicon-valleys-share-of-ven...
Uh, maybe it's time to take a drive through Austin, but that was a pretty sleepy little college town 10 years ago. Most of my family lives in the central Texas region (San Antonio, San Carlos, College Station), and I presently live in Mountain View. I have a hard time believing SF-scale infrastructure was built that fast.
As an example, here's the UT wind tunnel: http://research.ae.utexas.edu/floimlab/Mach5.php
Here's the Moffett wind tunnel complex: https://www.nasa.gov/centers/ames/multimedia/images/2005/nfa...
This site does a pretty good job: https://sfciti.org/sf-tech-exodus/
Article from the SF Chronicle: https://www.sfchronicle.com/bayarea/article/Austin-COVID-tec...
Hopefully that addresses your question as to why I hold this opinion.
According to wikipedia/some google-fu SV has just above double the high tech jobs as Austin
Not quite what you were asking about but it does deal with the TX grid.