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No, voltage can be dropped a bit. "Brownouts" are a thing. But they're less effective than they used to be, because everything with a switching power supply will draw more current if the input voltage drops. That's now a big fraction of the load.

Surely it’s not a big fraction of the load tonight. This whole problem is being caused by heaters.

But heaters on thermostats will just run more if they are putting out less wattage. So across your whole population of houses, you won't move that part of demand much (maybe a few were already running at 100% duty cycle).

It's a tool where I am. The grid operator does tests for 3% and 5% reductions:

https://www.ieso.ca/Corporate-IESO/Media/News-Releases/2019/...

Would be very effective with the space-heater (or oven?) driven demand right now in Texas. Not effective for A/C-driven demand (motors will draw more current).

>Frequency is so low that in the past hour any power line time base has fallen over 5.5 seconds behind. That’s a massive drop in frequency.

Out of curiosity, where did you find this?