Excessive heat in parts of the country is straining the nation's aging electrical power grid. Temporary brownouts may occur in different places.
But what would happen if the United States lost electricity permanently?
Electromagnetic Pulse Bomb (E.M.P.) experts warn America's enemies are already targeting the U.S. for a devastating attack, and at least one expert believes such an attack is inevitable.
An E.M.P. is a nuclear weapon designed to explode high in the atmosphere, resulting in a knockout of a country's electrical power grid.