It is possible to connect/disconnect copper wire? I'm trying to use this mod to divide power grid on section like separate beacons and turn them on/off.

No that's not possible in the current way the mod works (the power antennas aren't poles themselves).

I could probably add in a setting so that the poles only reach far enough to get to the next, same sized entity (so you could still string assemblers along for instance). Does that sound like a good idea?

Also, I have to ask, how the hell did you change your mods portal avatar??

Anything that allow to build separated sections sound good :D

About Avatar i didn't change anything. I didn't know that I have avatar on mod portal (i don't see it). Maybe it's related to main site because mod portal use the same account.