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Spain's blackout highlights renewables' grid challenge
Spain's blackout highlights renewables' grid challenge
Economy
By AFP

The cause of last week's massive power outage in Spain and Portugal remains unclear but it has shone a spotlight on solar and wind energy, which critics accuse of straining electricity grids. - No sun or wind - Just before the massive blackout on April 28, wind and solar power provided 70 percent of Spain's electricity output.