With falling solar activity, the likelihood of extreme solar storms is falling. I see the Southgate news site reports that research has indicated the earth suffered a couple of destructive solar storms more than 1000 years ago. If these happened today they would pose a real threat to power supplies, satellites and our whole way of life in the 21st century. We cannot ever be complacent as these events often happen "out of the blue".
See http://www.southgatearc.org/news/2015/october/extreme_solar_storms.htm#.VjCdPCtEd80 .