Who's talking about terrorists?
The danger is another Carrington Event, which unlike your 500-mile tsunami and fire-breathing lizard examples could actually happen.
Half the planet's power transformers blowing out is hardly "nothing more than a power outage".
Such transformers can take a long time to replace, especially if hundreds are destroyed at once, said [Daniel] Baker, who is a co-author of a National Research Council report on solar-storm risks.
The U.S. Air Force Research Laboratory's Cliver agrees: "They don't have a lot of these on the shelf," he said.
"Imagine large cities without power for a week, a month, or a year," Baker said.