Look past the planes. (Can you?) How about the power grid? Last spring someone broke into the computer systems of the California Independent System Operator (Cal-ISO), the state manager of long-distance electricity transmission. According to Cal-ISO, the target was a test system unconnected to the grid. There was no damage. Still, the electronic intrusion, looked at in the light of the Sept. 11 attacks, unnerves the organization. The word that comes to mind: vulnerability. “Did both incidents reinforce in our minds the need to be vigilant?” asks Gregg Fishman, a Cal-ISO spokesman. “Yes. To take extra precautions? Yes.” Full Story