There are a lot of spells on the energy portion of the spells site that talks about the soul. Soul charge, soul consumption, soul drain, etc. Do they literally mean the soul or are they referring to energy? So energy charge, energy consumption, energy drain, etc.
Soul and energy are two very different things
soul energy is the life force behind every living thing use that to the point of having none left is very dangerous.
Energy on the other has two forms physical and spiritual.
Physical energy is pretty strait forward the energy you use to do things like stand etc.
Spiritual is more like will power or focus.
While all three forms can be used in spells it is suggested that you work with only physical and spiritual.