Limited Energy Systems
In order to qualify for a Limited Energy System and do scaling according to it, a character or the system they are using must have explanations or showings that indicate that the powers which should scale to each other draw from the same source of power (or can convert between the different kinds of power) and use up a similar amount of power to each other. Alternatively, it would also suffice to show that the user can invest similar amounts of power into any given technique, should they want to.
For the sake of scaling it would also suffice if powers are shown to use a larger amount of the common power than the technique which produced the feat in question did, although in that case one wouldn't talk about a Limited Energy System as the inverse doesn't hold. (i.e. feats of those techniques that need more power wouldn't scale to the techniques that need notably less)
Non-physical Energy Systems
In order to qualify for a Non-physical Energy System and do scaling according to it, a character or the system they are using needs to fulfill all criteria for a Limited Energy System, but for all techniques. Additionally, they have to demonstrate or have reliable statements that all their supernatural or otherwise non-physical powers scale to each other in
Attack Potency. Hence an increase in power / energy should correspond to a proportional increase in the potency of their powers and abilities.
That means in particular that either the user makes use of only one system of power (e.g. magic powered by mana) or that the user uses several different ones (e.g. magic and chi) but they draw from the same underlying power source or can convert their power between the different kinds of power sources.
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