How cyber-attacks in Ukraine show the vulnerability of the U.S. power grid

On Dec. 23, 2015, a well-planned, perfectly synchronized and brilliantly executed cyber-attack caused a six-hour blackout for hundreds of thousands of customers in and around Ukraine's capital city of Kiev. While there have been no reported cases of cyber-terrorism causing power outages in the U.S., the attack methodology, tactics, techniques and procedures that were successfully deployed in Ukraine could be deployed against infrastructure here and around the world.