Ukrainian cyberattack on power supply a 'wake-up call' for US

With consensus growing that hackers caused a widespread power outage in Ukraine last month, many security experts worry whether the US grid could withstand such an attack...
http://www.csmonitor.com/World/Passcode/2016/0113/Experts-Ukrainian-cyberattack-on-power-supply-a-wake-up-call-for-US