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Sniper attack on California power plant shows risks to grid, ex-U.S. official says

The revelation that a group of people attacked a power station in California last spring is forcing a reassessment of what may be the most frightening threat to the nation’s electricity grid. Before the news broke, most utility executives were worried about cyberattacks. But The Wall Street Journal reported Tuesday that the attack on the Metcalf power station near San Jose in April was much more conventional: