A hacker could disrupt Tennessee Valley Authority system , causing damage . TVA supplies power to almost 9 million Americans . • Servers and work stations lack key patches and effective virus protection . Congress was told 75 percent of utilities fixed problems to avoid attacks . States : no clear indication of how vulnerable they are to cyber attacks .
A hacker could disrupt Tennessee Valley Authority system , causing damage . TVA supplies power to almost 9 million Americans . Congress was told 75 percent of utilities fixed problems to avoid attacks . States : no clear indication of how vulnerable they are to cyber attacks .