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A solar storm could generate the same effect. And that’s not just a theory — it’s happened before. In 1989, “a vast cloud of…plasma,” ejected from the sun, caused a 12-hour blackout in Quebec
http://www.pbs.org/newshour/making-sense/column-danger-devastate-electri…
http://www.usnews.com/news/articles/2016-09-23/is-the-energy-grid-in-danger