Great mod.

I hate the spagetti fest of powerpoles and substations are not powerful enough.

Would love to see you to include the medium poles and substations in this mod with the same idea behind it, but to cover an even greater area if possible

I hate the spagetti fest too (meanwhile) ;-)
I dit create the mod to match my city blocks of 64x64.

Too much different power poles are counterproductive, so which size of supply area do you would you prefer?

However, the maximum wire distance is 64, i.e. if the coverage area is larger than 64, additional power poles are required to connect them together.

Ah too easy in that case. I did think their might have been a game limitation on the coverage otherwise you may have continued to scale it up already.

maybe some kind of relay or so with very low supply area, but the necessary wire distance to connect two of your poles

There are already mods which publish "normal" power poles with long range. I use Bio-Industries. I dont want add too much poles into the game.
But I have already planned to extract the huge power pool from Bio-Industries and make it available if Bio-Industries ist not active.

power line added with max length (64)