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(³ª) In the summer of 1996, between the crest of the Rockies and the Pacific in America, everything powered by electricity suddenly went silent. The afternoon temperature in Denver had soared to above 37¡É, and hundreds of office workers were rushing from office towers to the cold breeze of their cars' air conditioners. Long lines formed at gas stations for fuel and ice, traffic lights were blank, hospitals and air traffic controllers were operating on an emergency basis only, and people trapped in elevators were pushing the alarm button in vain. "On a hot day it takes no time to turn a modern office building into an incubator," remarked an office worker. "There is no ventilation, and you can't open any windows."
As the nation's electricity dependency deepened over the year, utility companies learned to increase efficiency and decrease costs by sharing facilities and supporting one another. As a result, formerly islanded systems began to link up, giving rise to the biggest human-made structure on Earth, and containing enough wire to reach to the moon and back.
With thousands of generators, millions of miles of lines, and over a billion loads, this huge unified system is now so interdependent and sensitive that a single disturbance can be detected thousands of miles away. But the blackout in 1996 has brought up the crucial weakness of this formidable system. Having an interconnected system really makes for more efficient use of our natural resources and keeps the cost down. It, however, means that when something goes critically wrong, it can break down the whole system. With over $1.5 billion in damages and lost productivity, the 1996 blackout highlighted an often ignored Achilles' heel of interconnected systems.

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