The grid operators needed more than a day to fully restore the power supply in Spain and Portugal. One of the circulating theories is that excessive solar power caused the blackout. Is that true?

Some media outlets have speculated that Spain’s April 28 blackout may have been caused by a disconnected solar plant, but DNV grid analyst Andrea Mansoldo tells pv magazine that it was likely due to a combination of grid weakness and low-frequency oscillations.

In response to a power outage in Spain and Portugal, the U.S. Department of Energy’s secretary Chris Wright tried to blame the use of solar and wind energy, though the cause of the blackout is not yet