Well, its all part of the Universal energy of Life, and so maybe PUL is also the same, since PUL is also the energy of life and Consciousness itself... Well not the same, but it is what holds it into place i think.
Prana may also be related, though as i uderstand it there are certain types of prana, like Solar Prana, Breath Prana, etc... But then again, its the energy of life and vitality.
Maybe PUL is all the above, but with a specific Consciousness and feeling associated with it? Like PUL is both awareness (a passive/feminine expression) of Oneness and acting out this awareness, giving it forth (active/masculine expression).
Its kind of like the Chakras, they are really just Transformers of Universal energy, and they both receive, send, and alter this energy.
Each Chakra (in the universal/objective system) refines this Universal energy more, or brings it to a slower vibration... For example, it gets really slowed down through the 1st Chakra so we can be physically alive in bodies...
But the highest Center, the Crown is pretty much this Universal energy in its pure state... Its a matter of attuning ourselves to each dimension/Chakra...and then balancing all exrpressions and awarenesses.
Kundalini to me is the raw Earth energy which can rise from the 1st Chakra, and energize all the Chakras potentially, and then we always have Divine, Universal Love energy flowing in through our Crown Center, but most just don't tap into this.
And there is both a negative and positive charge to these energies.
I believe Bruce Moen also practices Tai Chi, so i guess he would be someone to ask?