The blackout that took down the Iberian grid serving Spain and Portugal in April was the result of a number of smaller interacting problems, according to an investigation by the Spanish government. The report concludes that several steps meant to address a small instability made matters worse,

Spanish grid operator REE's failure to calculate the correct mix of energy was one of the factors hindering the grid's ability to cope with a surge in voltage that led to the massive blackout across Spain and Portugal on April 28,

The Spanish government has said that the national grid operator and private power generation companies were to blame for an energy blackout that caused widespread chaos in Spain and Portugal earlier this year.