A sniper attack in April at a PG&E Metcalf power substation near San Jose, Calif., which knocked out 17 transformers, raises concern for the U.S.' power grid and underscores the need for better grid security, according to these reports. The FBI said the little-publicized incident was not an act of terrorism, but Jon Wellinghoff, former chairman of the Federal Energy Regulatory Commission, contends it was "very well planned and well executed by very highly trained individuals," and was "the most significant incident of domestic terrorism involving the grid that has ever occurred," in the country. Meanwhile, PG&E and other utility companies have increased their security measures, but "these incidents are always opportunities for the industry to get better at security," said Scott Aaronson of the Edison Electric Institute.

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