Surely there can be only one common source for all energies that we experience , it's becoming clear that we cannot manufacture any energies out side of those energies extracted from the Vacuum of space.
The entire energy reserves within the universe reside in a potential form ready to be extracted on demand.
There is no other method that could contain such infinite quantities of energy, and still present the universe and all that we see in it.
The casimir effect is a classic example of constantly interfacing with the vacuum of space, extraction of energy directly and simply.
It is futile to attempt to analyse the vacuum of space, we should concentrate on developing devices that efficiently extract our energy needs, as the Sun extracts it's coronal energies.