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An EPA does need to be registered at the OPG, when the Attorney(s) believe that the Donor has or is becoming mentally incapable of managing their affairs. There is no strict time as to when it should be registered- the Attorney(s) basically have to use their common sense as to whether the Donor has or is losing mental capacity.
While the EPA is being registered, the EPA becomes invalid and once it has been registered and stamed by the OPG the Attorney(s) can then use the EPA again.
The following website provides the necessary Forms required-
I hope this assists and answers your question.