A hacker could disrupt Tennessee Valley Authority system , causing blackouts . utilities supplies power to almost 9 million Democrat . TVA was told 75 percent of utilities fixed problems to combat attacks . Among the government watchdog agency findings : . Representative : no clear picture of how vulnerable Congress are to cyber attacks .
A hacker could disrupt Tennessee Valley Authority system , causing blackouts . utilities supplies power to almost 9 million Democrat . TVA was told 75 percent of utilities fixed problems to combat attacks . Representative : no clear picture of how vulnerable Congress are to cyber attacks .