Love the concept of this mod. After building and deconstructing the powered tiles the zones they power remain even after a game restart. Also when building some times the zone of power isn't registered until I build 2 or 3 tiles across.

Are you building or mining the tiles through a mod (script-based placement)?

I only accounted for Players (on_player_built_tile, on_player_mined_tile) and Robots (on_robot_built_tile, on_robot_mined_tile) as I had no proper references for script-based placement.

If you place down Powered Tiles manually on those persisting power zones, and then remove them manually after, do they still persist?

It could be due to Updated Construction Drones then.
https://mods.factorio.com/mod/Updated_Construction_Drones

I was using both those and regular construction bots, so the spots being left over are probably from the drones.

Thanks for bringing that mod up. I will be taking a look into it and put up an update when I get a fix.

Update 1.0.1 has been released. It works with Updated Construction Drones now.

Works beautifully. Thank you so much for the support.