Red Eléctrica president Carmen Corredor became the central figure as she announced officials had "more or less located" the cause of Monday's massive blackout while refusing to resign and denying renewable energy sources were responsible. The government's distrust intensified throughout the day, with Prime Minister Sánchez demanding that energy companies submit all blackout data by afternoon.

By midday, Sumar party escalated political tensions by calling for 100% nationalization of the electric grid. In the afternoon, the government took extraordinary measures by dispatching CNI intelligence agents to electric companies' operational centers to gather data, while a judge classified the sabotage investigation to prevent "manipulation."

The first legal complaint against Corredor was filed by evening, as El Periódico revealed the precise moment the blackout began: "Monday, 12:33:16.442... and chaos ensued." Meanwhile, in the financial sector, Spain's Competition Authority approved BBVA's takeover bid for Sabadell bank.