Globe Newswire: The nerve center for electric power transmission in California says that cyberattacks now pose the most serious threat to the grid. According to a June 14 report in the San Diego Union-Tribune, the California Independent System Operator (ISO) is fighting off several millions of attempted intrusions every month. Hubert Hafner, the California ISO’s head of cyber security, said his network is “in the cross-hairs of terrorists and nation-states that want to harm the electric grid.”...