I have felt very powerful after doing RAUM meditation.
Satanama chanting also have more power and of course empower oursoul.
But, for me, individually, RAUM meditation is best for me both Empowering mysoul and increasing my energy.
Try SATANAMA in hatha yoga and kundalini yoga.
Also, try RAUM meditation. Consider yourself which meditation is best for yourself soul empowering.
I am very much comfortable with RAUM meditation for both empowering mysoul and increasing my energy.
To me, I have felt that SATANAMA is a natural mantra for empowering soul.
It can do so if used for that purpose with a suitable affirmation. It's an all purpose meditation to raise energy, which can be programmed to do something or used to boost your power for a working.