Spain's grid operator denied on Wednesday dependence on solar power was to blame for the country's worst blackout, while Prime Minister Pedro Sanchez came under increasing pressure to explain what went wrong.

The mass electrical blackout across Spain, Portugal and parts of France sparked hours of chaos before power returned – with the after-effects still being felt. At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.

The massive blackout that left Spain and Portugal in the dark on Monday brought home for many Europeans the overwhelming reliance their societies have on electricity—and the stability of the power system that provides it.