The California Independent System Operator, which oversees about 80 percent of the state’s electricity consumers and 26,000 miles of transmission infrastructure, is a busy place. It’s also a target. “We are looking at several millions of undesired communications trying to connect with us per month,” said Hubert Hafner, who as manager of Information Security Technology makes it his job to ensure California’s grid remains secure from cyberattacks. “That’s our No. 1 risk,” Hafner said recently while attending an energy conference hosted by the Institute of the Americas at UC San Diego. “That’s why it’s getting a lot of priority and, accordingly, a lot of resources.”