The operator is E-REDES, and the operator:wikidata is Q111843687. These two are correct.

The operator:wikidata is pt:Energias de Portugal (also known in Portugal as EDP), because E-REDES belongs to the EDP holding (and E-REDES does not have a separate Wikipedia page). E-REDES is the national network operator, and it is a rebranding of the state company EDP's network operation subsection.