When you reach a certain stage of the game, some machines will consume more energy than can be obtained with the limit of 50 generators. So the only solution I was able to find is to disable this limit. And here's how to do it.

1. First, find the folder where the file containing the limit is located.

You can find it here: steamapps\workshop\content\387990\3342584624\Scripts\Generators

2. Open the file Generators.lua using Notepad or Notepad++.

3. In line 14, find local maxGenerators and change the value from 50 to, for example, 500, then save the file.

And it's done. Have fun!