Article in English: https://www.bbc.com/news/articles/c62d8k8edgxo

giving them more time for their investigations

@LudwigBald Seems they finished their report: https://www.sueddeutsche.de/panorama/stromausfall-spanien-portugal-ueberspannung-energieversorgung-li.3270728

"Unsachgemäß verhalten" reads like human error to me.

@Primer google translation:

A good seven weeks after the historic power outage on the Iberian Peninsula, an investigation report into the causes has been presented. The hours-long blackout on April 28 in Spain and Portugal was caused by excessive voltage in the grid, said Spain's Deputy Prime Minister and Environment Minister Sara Aagesen in Madrid. This triggered a chain reaction of protective shutdowns. There is no evidence of a cyberattack.

The surge in the Spanish power grid was caused by several factors. First, the grid operator, Red Eléctrica, failed to plan its electricity production with the "necessary caution." It had too few power plants connected to the grid to compensate for voltage fluctuations. Additional capacity was only planned for the early morning hours, but not for the central hours of the day.

Secondly, the operators of conventional power plants, i.e., combined-cycle power plants, nuclear power plants, and hydroelectric power plants, also "behaved improperly," Aagesen said. They did not absorb sufficient overvoltage from the grid, and other power plants disconnected from the grid due to the overvoltage, even though they were not allowed to do so according to the system specifications. Why Red Eléctrica planned too carelessly and power plant operators behaved incorrectly remained unclear at first. Aagesen only hinted at a lack of coordination, unclear responsibilities, and a lack of transparency in the overall system.