From Fridays' PBS Newshour regarding power in Kyiv, Ukraine:

 "In Kyiv, 78% of buildings currently have heating. The Ukrainian government has received 700 generators from donors and expect 900 more to be delivered."

end quote from PBS NEWSHOUR on Friday November 4th 2022.

I got to thinking about the power problem more and realized that substations in Kyiv would have to be put deep enough underground to withstand all but the biggest bunker buster munitions from Russia. The main problem is the air intake and exhaust of gas or diesel  Generators operating underground. But, electrical Substations only would need some buried wiring to transmit electricity. Substations usually are to reduce power down to around 1000 to 220 volts for use in Housing and businesses, so they are mostly about being transformers from one voltage to another. Long distance transmission has less line loss at higher voltages than lower ones. This is why you need Electrical Substations to reduce the power down to where people can actually use it from 1000 to 30,000 or more volts down to around 220 in the EU and 220 and 110 here in the U.S.

We use 110 here in the U.S. because 110 is less likely to kill you if you get shocked than 220. However, if you are standing in water when you grab a hot 110 you can also die of 110 volts too.

If you look at the 3 wires coming into your house here in the U.S. there are usually two black and one white wires. This is usually single phase 220 volts coming from a transformer on a power pole or on the ground nearby if you have underground wiring coming to your home or business. In your main panel if you take one black one and the white one you get 110 volts. But, if you take both black ones and the one white one you get 220 volts which is mostly for things like dryers or stove and things like that or hot tubs (jacuzzis).

A pole transformer normally tranforms 1000 volts down to 220 volts for use in households and businesses. Then in your main house panel you transform down to 110 volts by taking only one black and one white wire which gives you 110 volts.