A hacker could disrupt Tennessee Valley Authority system , causing blackouts . TVA supplies power to almost 9 million Americans . The company estimated it would need to sell about 10,000 devices to fix the problem nationwide . Comment: Representative : no clear picture of how vulnerable utilities are to cyber attacks .
A hacker could disrupt Tennessee Valley Authority system , causing blackouts . TVA supplies power to almost 9 million Americans . Comment: Representative : no clear picture of how vulnerable utilities are to cyber attacks .