The inability of Spain’s electricity grid to manage an unusually high supply of solar power was a key factor in Monday’s catastrophic blackout, former regulators and experts have said.
About 55 per cent of Spain’s supply was from solar sources when 15GW of electricity generation disconnected from the grid within just five seconds on Monday afternoon, triggering a wide-ranging shutdown of power systems in Spain and Portugal.
Several European experts said that Spain appeared to lack enough firm power — readily available, reliable energy supply from sources such as fossil fuels or nuclear that can be reduced or raised — to kick in when the grid’s frequency dropped sharply at 12.33pm on Monday. Frequency, the rate at which electrical current alternates, must be kept stable for the grid to function.