There is the Circuit Isolator 2.0 mod, but I'm not sure how it works.

thanks, i saw that, seems like an odd backup that kicks in when primary fails.

Would just like a mod that allows wires to cross so that all generators can be on same circuit

Originally posted by City Builder:

thanks, i saw that, seems like an odd backup that kicks in when primary fails.

Would just like a mod that allows wires to cross so that all generators can be on same circuit

That's what I thought when I saw it too, but I think that's the closest thing there is for now

This
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1979331114
will not help to combine two power grids, but to monitor an almost maxxed out power station so you know when you need to upgrade to a new grid without massive power outage time.
It also helps with Events to have a backup station active when the power station blows up.

If you want more power, then upgrade to this
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1334822035
which offers the same power amount as 4.5 normal power grids. So 1 of these or 5 separate grids for your prison, it's your choice.

For less power hungry prisons you can go smaller but still with 40 capacitors
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=687900221
Both go on the useless piece of land next to the road, so no wasting prisoner capacity space on your map.