The Revocation of Power of Attorney can be carried out by the owner or the principal as and when required. One of the causes that might lead to change is that you may have problems with the agent. As a result, you would not trust the person. One can completely revoke the power of attorney or else get a new one created. You should send Notice to the agent about the termination of the authority. Document must be signed before the notary to ensure that everything is carried out in a legal and proper order.