-Power
-Consumer building subtracts from grid power value, generator adds.
-save/load functions to ensure it works and doesn't reset when reloading? Might be something the prefabs need to do instead.
-simple way to determine how much prod./cons. a building does to make adding the tons of buildings I have in mind easy.
-Make it return some variable that if power positive then do x.
-Connecting to buildings
-Power grids