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The Spanish grid was unable to control voltage, resulting in a blackout

Sara Aagesen, Spain's energy minister, said that the Spanish grid's inability to control grid voltage led to a chain of events that caused the massive blackouts that struck Spain and Portugal April 28.

A detailed report of the investigation will be released on Tuesday. It found that power plants required by law, to regulate the voltage on the grid, failed to do this in the moments leading up to the blackout.

Aagesen stated in a press briefing held in Madrid that "the system did not possess sufficient dynamic voltage control capability".

The power plants "should have been able to control voltage, and many of them received economic compensation for doing so." She added that they did not absorb the full amount of reactive power expected in high voltage contexts.

The blackout, which lasted several hours, caused gridlock across Iberia and thousands of people were left stranded in trains and elevators.

She added that the investigation had found no evidence to support a cyberattack. (Reporting and writing by Charlie Devereux; Inti Latona, David Latona)

(source: Reuters)