File this under the category of things I don't know much about but will talk about anyway, but it seems like home refrigerators and especially freezers could be much better managed for power variability that we'd see in a system dominated by solar and wind. They use more power than anything in the home other than heating and cooling, so adapting to variability seems like a big deal.
Received knowledge is the ideal maximum temps are -18C for the freezer and 5C for the refrigerator. My oh-so-genius insight is they could both get colder, especially the freezer, when power is available and then allowed to drift upward when it's not. So in power system with lots of solar, both the fridge and freezer should kick in at mid-afternoon. The fridge drops to 1C and the freezer to -23C or maybe colder, and then power demand is ended or sharply reduced by late afternoon, when solar is disappearing and other power demands are ramping up.
My other maybe/maybe-not insight is that if the max temps are constant temps, maybe those maximums could be exceeded periodically during the daily cycle without limiting food storage times. Maybe a freezer could spend two hours daily rising -18C to -13C without too much of an issue, and maybe a refrigerator could drift up to 7C before it has to start cooling back to 5C.
Refrigerators get opened a lot and can't be cooled as much as freezers, so the benefit isn't as great, but still exists. For freezers, ones that aren't opened or rarely opened might get through to sunrise without demanding power.
Systems with just a clock and a calendar could make use of solar availability to store coldness. Smart systems on the internet could do even more, especially with wind. If wind turbines somewhere start dumping extra power in the system at 10 p.m., your fridge and freezer turn on and run as long as the power lasts or until they get as cold as they should go.
Just a thought.
More info on managing power availability here. Also here on commercial scale storage of coldness.