Used mod:
Electric transformators https://mods.factorio.com/mod/Electric_Transformators
Fortunately, it is possible to change the priority of the transformator output connectors, thus I can create hierarchies between power networks.
Unfortunately, after changing (increasing) the priority of said transformator, a ghost entity remains after deconstruction. Probably like the issue with the condenser turbine from SE mentioned on your mods information page.
Uber-Unfortunately, this cannot be reversed by re-changing the priority: Even after decreasing the priority (back to default setting?!), a gost remains after deconstruction. While it is possible to remove the ghost with a grenade (but not with a gun... ), I'd prefer a mor civilised way of replacing my hardware ;-)
I am also using power overload https://mods.factorio.com/mod/PowerOverload and some other mods, but I tested this behaviour with only yours and electric transformators installed.
PO / PP / ET are a nice combination in my opinion:
PO: demands you to divide power networks (not overloading your poles)
ET: gives you some control over how much power goes where
PP: enables hierarchies between (power supply) networks
It would be really cool, if they would work together well.
Kind regards, Lone Starr