"We have concluded that there was no intrusion into Red Electrica's control system," the company's head said, as quoted by El Pais newspaper, adding that the investigations into the blackout's causes continues.
On Monday, electricity and mobile phone networks were cut off in hundreds of businesses and homes in many parts of Spain, including Madrid, Barcelona, Valencia, A Coruna, Seville and other cities, at around 12:30 local time (10:30 GMT). Power outages were also reported in Portugal. Later in the day, Spanish Prime Minister Pedro Sanchez announced that almost half of the country's electricity supply had been restored.