Has this actually ever happened, ever?

[PSRB]

http://news.sky.com/story/blackouts-from-extreme-space-weather-could-cost-16333bn-study-10733502

I mean even the one occasion mentioned sounds more than a little dubious

I'm going to go with this being utter *******s

[Mo Britain less Europe]

I remember one occasion when there was some disruption to communications due to solar flares.

This of course is totally man-made.