The concept of powers is debatable. Some feel it is a topic for fantasy magic and others find it to be a vague term used to describe the energy we all have within us, combined with focus and will that helps us do magic.
The power that is within us cannot be stolen. It can ebb and flow depending on physical, emotional and mental states. This is the same power one uses to get out of bed in the morning, to do school work, to go to work, to exercise, to hang out with friends, and so on. It is a natural part of us.
If you are referring to the fantastical definition of power, the ability to shoot fire balls, transform physically, or use mind control, you are discussing something that doesn't exist and therefore cannot be taken.