The main electrical blackout assigned to the Iberian Peninsula at 28 April already has a significant voltage in the Spanish metal sector. Much of the foundries and industrial plants are experimenting with prolonged interruptions, taking up to 22 hours to fully restore their activity. This incident, without precedent in the recent history of the Spanish industry, has revived the debate on the need to strengthen the energy resilience of the country, especially in critical sectors such as metallurgy.