Mod by Romner_set: https://mods.factorio.com/user/Romner_set. Original version: https://mods.factorio.com/mod/PoweredBelts. I've modified the behaviour of powered belts (and others) to use buffer capacity of x1kJ instead of x17J and the entities turn off when they have less than required energy defined through setting (default = 500J). You could exploit it otherwise having 1 solar panel powering a huge amount of belts that won't slow down due to limitations of this mod.