(Bloomberg View) -- A successful cyber-attack on a power grid is a nightmare that keeps intelligence services and security experts awake at night. Now the threat is no longer theoretical: A grid in Ukraine has been brought down by hackers. The vulnerability they used? As so often with hacking, human stupidity.

The engineered blackout scenario is so scary Ted Koppel, the former Nightline host, recently published a book about it. In "Lights Out: A Cyberattack, A Nation Unprepared, Surviving the Aftermath," Koppel claimed the U.S. was unprepared for an attack on one of the three power grids that distribute electricity throughout the country. He wrote:

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