Sorry for my english, I have no practis for 7 years.
So. What i have done -
I go to map view,
Go to some plase where I need, and begin plasing electricity substations.
In some time i came back to this plase and found that substation doesn`t connect to Neighbors.
https://prntscr.com/ss49bx
If I will remove this substation and put it manualy - it will be connected.
PS
I can`t remember the first such mistake, but it happens already a week or two.