Portugese power bosses blamed the widepread power outages on "anomalous oscillations" in very high-voltage lines.
The effect is known as "induced atmospheric variation" and it could take up to a week for the network to fully normalise again.
We'll be bringing you the very latest updates, pictures and video on this breaking news story.
For the latest news and breaking news visit: News - Latest UK & World News Stories | Express.co.uk
Stay up to date with all the big headlines, pictures, analysis, opinion and video on the stories that matter to you.
Follow our social media accounts here on facebook.com/DailyExpress and @Daily_Express
