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

Spanish authorities say the massive power outage in April across Spain and Portugal was due to technical and planning errors that led to a cascade of failures in the grid.

In April, a massive blackout paralyzed Spain and Portugal for hours. A new government report has revealed the cause.

Spain’s most-detailed account yet of the missteps leading to April’s nationwide blackout failed to fully explain why the power grid was so unstable in the first place.