Personal power is adopting a positive or resourceful state and being at-cause about your outcomes.
In NLP, being at-cause means taking full responsibility for your experiences and results — placing yourself on the Cause side of the Cause > Effect equation. When people give away their personal power to others or to circumstances, they feel disempowered and become unable to create change.
Empowerment is the process of taking back control of your life and decisions in order to create the outcomes that you want and to move away from the things that you don't want.
Personal power is not about controlling other people or external events — it is about recognising that you always have a choice in how you respond, and that your inner state determines the quality of your actions and results.
See also: The Law of Consequences | What is a State? | What is NLP?