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Spain says 'overvoltage' caused huge April blackout

techxplore.com Spain says 'overvoltage' caused huge April blackout

A major power outage that paralyzed the Iberian Peninsula in April was caused by "overvoltage" on the grid that triggered "a chain reaction," according to a government report released Tuesday.

Spain says 'overvoltage' caused huge April blackout

Aagesen singled out the role of the Spanish grid operator REE and certain energy companies she did not name which disconnected their plants "inappropriately... to protect their installations."

She also pointed to "insufficient voltage control capacity" on the system that day, due in part to a programming flaw, stressing that Spain's grid is theoretically robust enough to handle such situations.

Due to these misjudgments "we reached a point of no return with an uncontrollable chain reaction" that could only have been managed if steps had been taken beforehand to absorb the overvoltage problems, she added.

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