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,

Aelec, which represents Spain's main electricity companies including Iberdrola and Endesa, said on Wednesday that "claiming everything was done correctly" while blaming some power