Unfortunately because security was not a concern for most of these pieces of infrastructure, securing them would probably be pretty expensive. Between the publicity and damage to infrastructure however, there could be enough pressure to spur something. While IP cams may not be sufficient to defend such substations from gunfire, it might have been enough to make IDs in these cases. I don't want to discuss specifics of site security with you, seems like that information probably shouldn't get spread around right now, but do you know if security is the responsibility of the power companies or the government in these instances?