Marten wrote:

Okey, wild guessing on the way: Randall and whoever he works with did turn off the lights, believing that they could turn it on at will with one or a few pendants. But they were all of them decieved, for other pendants were made.
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Or he was part of an extremist group that thought they could bring down the United States with the device, not realizing it was more powerful than they thought.
Perhaps the machine is protected like Colossus was in "Colossus: The Forbin Project."