There are almost certainly people in the FBI and other agencies who have considered the risk and have thought about it and watch for people trying to do this ma

There are almost certainly people in the FBI and other agencies who have considered the risk and have thought about it and watch for people trying to do this maliciously. They just don't write things up and tell you what they have thought about and what they have in mind to handle it. Hopefully, when things like substations go down and alarms go off people do, quietly, think about what the impact could have been. However, it doesn't mean that an attack couldn't succeed.