I've spent the past month in the mountains in Ukraine, and it's been as low as -18ºC at times. Terrorists from russia have repeatedly knocked out power generation, and so on many days we have very little access to electricity in the house. Today we have 15.5 hours without power.

During the day, we'll be somewhere where they have a generator. At night, it's cold. But you can somewhat prepare for this. Two or three layers of duvets and blankets, paired with a hot water bottle somewhere in the middle of the bed under the covers will get you through the night.