This mod introduce new mechanic call player power,a free energy source in early game.
However using it require you revisit it over certain period of time,which further limit its protential,
that is why you should upgrade it into the electric phase or steam/burner phase depand on the modpack you were playing.

this mod also contain some small feature like:
allow fluid recipe be handled in assembler 1,
manually fill barrel with water.

If you are modding,you can catch capsule event to custom your filling reaction,
any machine with fluid box which filter set to playerpower will be charge if player can open its gui.

However,my true intention is provide interface for https://mods.factorio.com/mod/just_enough_inserters