Yes, exactly the same legal value as a power granted in person.
The Notarial Law, reformed to permit notarial actions at a distance, establishes that the notary may authorize public documents by identifying the grantor through videoconference with the required technical guarantees.
The process is identical to the in-person one:
- The notary verifies the identity of the grantor by means of DNI/NIE visualized by camera
- The notary reads the document in full
- The grantor gives their consent
- The notary attests to the signature and the content
The resulting document is a notarial public deed with full validity erga omnes, registrable in registers, accepted by banks, administrations, and tribunals.