Step 1 would likely be to use your smartphone app to set your Internet enabled thermostat down to its lowest setting, probably 55F. High enough that the pipes don't freeze, but low enough to save energy. Probably not cooking anything either unless you have a gas grill. Definitely not plugging in the electric car. If this happens during the middle of summer then you turn the A/C off and hope the house can coast for the rest of the day without melting anything. At least in the summer you can grill outside.

But honestly, it boggles my mind that anybody would opt for these sorts of power plans with effectively unlimited downside and fairly marginal upside. Who wants this kind of stress in their life? Doesn't Texas already have pretty cheap power thanks to all of the wind and deregulation? Isn't that why they are in this mess in the first plate?