"According to a Wall Street Journal report by Rebecca Smith, last April a group of snipers cut the phone lines and internet access near a major electrical substation in San Jose, California, and then fired on the substation for 19 minutes, knocking out 17 transformers.
This is a big, big deal. The former chairman of the Federal Energy Regulatory Commission, Jon Wellinghoff, has been trying to draw attention to the little-discussed incident. Although the FBI doesn't think it was the work of a terrorist group, a retired VP of transmission for the utility company says that the attack was clearly well-organized and targeted at specific components of the substation. Although the utility, PG&E, called the attack the work of 'vandals' in a press release, military experts told Wellinghoff that it looked more like a professional job. Now, Wellinghoff, and others, are worried that it could have been a dress rehearsal for a larger attack."
I suspect if you call it terrorism it's easier to get money to secure it.