Batteries don't work all that well at these lower temperatures. I suppose if your Tesla is in a garage that would work, though.

Teslas regulate their battery heat for this reason.

https://www.tesla.com/support/winter-driving-tips

Of course, during these cold snaps, the battery doesn't really work well, right?

Powerwalls have an operating temperature range of -4 F to 122 F (-20 C to 50 C), although they recommend 32-86 F (0-30 C).

They can also be mounted indoors.

So as far as I can gather, there are no generating units (other than wind turbines) that are down for maintenance? There is really only a low pressure problem in the pipeline system that is causing some combustion units to idle?