Sovet power generation is a....mess of different technologies pulling in different directions. You've got nuclear power-not anywhere near the level of the Federation. Think Fallout.

Then you've got Tesla power, which at this point works mostly because someone neglected to tell the Soviets it wouldn't work.*

And then you have this lovely cocktail of unstable chemicals they use to power so-called "bioreactors".

*[i]Ambassador," Max said, "in the course of my life I have more than once been too ignorant to know that something was impossible before I did it anyway. I see no reason to jeopardize that success."
— Princeps' Fury[/i]