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The Wall Street Journal
Attack on California electric grid raises alarm
Attack on California electric grid raises alarm

Shooters armed with assault rifles and some knowledge of electrical utilities have prompted new worries on the vulnerability of California's vast power grid. A 2013 attack on an electric substation near San Jose that nearly knocked out Silicon Valley's power supply was initially downplayed as vandalism by Pacific Gas & Electric Co., the facility's owner. Gunfire from semiautomatic weapons did extensive damage to 17 transformers that sent grid operators scrambling to avoid a blackout. But this week, a former top power regulator offered a far more ominous interpretation: The attack was terrorism, he said, and if circumstances had been just a little different, it could...

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